feat(agent-core-v2): add spine_trim and spine_spawn experimental tools

spine_trim: model-driven tool-response trimming as a pure derivation over
the message stream. Tool results over 10 KiB (non-spine, text-only) carry
a byte-stable TRIM_ID tag; the model can snip or slice (head/tail/anchor)
the immediately preceding tool-result batch. Host validation shares the
single eligibility derivation with rendering; consumed, out-of-window, or
unknown ids reject with do-not-retry. Gated on KIMI_CODE_SPINE +
KIMI_CODE_SPINE_TRIM.

spine_spawn: fission the current node into >=2 concurrent forked branches
(lifecycle.fork plus trailing tool-call batch trim) and join their
terminal memories as closed child nodes synthesized from the structured
spine.spawn.result.v1 receipt in the message stream. All-or-nothing
capacity admission (default 4 threads including main, override via
KIMI_CODE_SPINE_SPAWN_MAX_THREADS), whole-batch abort on start failure,
guaranteed branch release. Gated on KIMI_CODE_SPINE + KIMI_CODE_SPINE_SPAWN.

Also adds legacyReplay regression coverage: five sanitized real old-session
wire logs restore with zero unknown-op skips, pinning op-replay vs
pure-derivation equivalence and the documented historical divergences
(receipt anchors, assembled memory bodies, undo witness erasure).

packages/agent-core-v2/src/agent/permissionPolicy/policies/default-tool-approve.ts

@@ -28,14 +28,19 @@ const DEFAULT_APPROVE_TOOLS = new Set([
   'UpdateGoal',
   // Spine task-tree control tools are receipt-only transitions of the model's
   // own task state (the real tree move is committed by the spine service on
-  // observed evidence) and fire once per node boundary. They register only
-  // when `KIMI_CODE_SPINE` is set (`registerTool(..., { when })`), so these
-  // names are inert with the experiment off; asking per call would make the
-  // spine workflow unusable.
+  // observed evidence) and fire once per node boundary; spine_trim is likewise
+  // receipt-only (the accepted receipt IS the trim, validated by the host
+  // against the derived eligibility window). spine_spawn is receipt-only too:
+  // the structured receipt IS the join, and the host validates capacity before
+  // forking any child agents. They register only when the relevant flags are set
+  // (`registerTool(..., { when })`), so these names are inert with the
+  // experiment off; asking per call would make the spine workflow unusable.
   'spine_open',
   'spine_close',
   'spine_next',
   'spine_tree',
+  'spine_trim',
+  'spine_spawn',
   'select_tools',
 ]);
 

packages/agent-core-v2/src/agent/spine/flag.ts

@@ -31,3 +31,49 @@ export const spineFlag: FlagDefinitionInput = {
 };
 
 registerFlagDefinition(spineFlag);
+
+export const SPINE_TRIM_FLAG_ID = 'spine_trim';
+export const SPINE_TRIM_FLAG_ENV = 'KIMI_CODE_SPINE_TRIM';
+
+/**
+ * Gates the tool-response trim projection: oversized tool results carry a
+ * stable `TRIM_ID` tag and the model can conservatively snip / slice them out
+ * of the projected context via `spine_trim`. The stored history is never
+ * rewritten. Requires the spine flag (the fold is integrated into the spine
+ * projector fold), and keeps `ignoreMaster: true` for the same reason.
+ */
+export const spineTrimFlag: FlagDefinitionInput = {
+  id: SPINE_TRIM_FLAG_ID,
+  title: 'Spine trim (tool-response trimming)',
+  description:
+    'Tag oversized tool results with a stable TRIM_ID and let the model conservatively trim them from the projected context (spine_trim); the stored history is never rewritten. Requires the spine flag.',
+  env: SPINE_TRIM_FLAG_ENV,
+  default: false,
+  surface: 'core',
+  ignoreMaster: true,
+};
+
+registerFlagDefinition(spineTrimFlag);
+
+export const SPINE_SPAWN_FLAG_ID = 'spine_spawn';
+export const SPINE_SPAWN_FLAG_ENV = 'KIMI_CODE_SPINE_SPAWN';
+
+/**
+ * Gates the `spine_spawn` parallel branch fission experiment: the model can
+ * split the current continuation into N independent child agents, each running
+ * its own prompt and returning terminal memory. Requires the spine flag (the
+ * spawn fold is integrated into the spine projector fold) and keeps
+ * `ignoreMaster: true` for the same reason as the other spine flags.
+ */
+export const spineSpawnFlag: FlagDefinitionInput = {
+  id: SPINE_SPAWN_FLAG_ID,
+  title: 'Spine spawn (parallel branch fission)',
+  description:
+    'Experimental parallel branch fission via spine_spawn: split the current continuation into independent child agents, each returning terminal memory. Requires the spine flag.',
+  env: SPINE_SPAWN_FLAG_ENV,
+  default: false,
+  surface: 'core',
+  ignoreMaster: true,
+};
+
+registerFlagDefinition(spineSpawnFlag);

packages/agent-core-v2/src/agent/spine/index.ts

@@ -13,9 +13,13 @@ export * from './spineDerive';
 export * from './spineOps';
 export * from './spineService';
 export * from './spineTree';
+export * from './spineTrimDerive';
+export * from './spineTrimFold';
 export * from './tools/controlResult';
 export * from './tools/descriptions';
 export * from './tools/spine-close';
 export * from './tools/spine-next';
 export * from './tools/spine-open';
+export * from './tools/spine-spawn';
 export * from './tools/spine-tree';
+export * from './tools/spine-trim';

packages/agent-core-v2/src/agent/spine/spine.ts

@@ -17,23 +17,30 @@ import type { ContextMessage } from '#/agent/contextMemory/types';
 
 import type { SpineEpochArchiveInput } from './spineArchive';
 import type { SpineState } from './spineOps';
+import type { SpineTrimOp } from './spineTrimDerive';
 
 export const SPINE_TOOL_OPEN = 'spine_open';
 export const SPINE_TOOL_CLOSE = 'spine_close';
 export const SPINE_TOOL_NEXT = 'spine_next';
 export const SPINE_TOOL_TREE = 'spine_tree';
+export const SPINE_TOOL_TRIM = 'spine_trim';
+export const SPINE_TOOL_SPAWN = 'spine_spawn';
 
 /**
- * All four spine control tool names. Profiles whitelist these so the main
- * agent's active-tool filter lets the registered tools through; surfaces that
- * merely display a profile's tool list (e.g. the `Agent` tool description)
- * filter them out instead, since the tools register only for the main agent.
+ * All six spine tool names. Profiles whitelist these so the main agent's
+ * active-tool filter lets the registered tools through; surfaces that merely
+ * display a profile's tool list (e.g. the `Agent` tool description) filter
+ * them out instead, since the tools register only for the main agent.
+ * `spine_trim` and `spine_spawn` are NOT control tools: they carry no tree
+ * transition and are gated on separate flags.
  */
 export const SPINE_TOOL_NAMES = [
   SPINE_TOOL_OPEN,
   SPINE_TOOL_CLOSE,
   SPINE_TOOL_NEXT,
   SPINE_TOOL_TREE,
+  SPINE_TOOL_TRIM,
+  SPINE_TOOL_SPAWN,
 ] as const;
 
 export type SpineControlToolName =
@@ -41,6 +48,11 @@ export type SpineControlToolName =
   | typeof SPINE_TOOL_CLOSE
   | typeof SPINE_TOOL_NEXT;
 
+export interface SpineSpawnTaskInput {
+  readonly summary: string;
+  readonly prompt: string;
+}
+
 export interface SpineTransitionAccepted {
   readonly accepted: true;
 }
@@ -61,6 +73,26 @@ export interface IAgentSpineService {
   acceptClose(memory: string): SpineTransitionResult;
   acceptNext(summary: string, memory: string): SpineTransitionResult;
 
+  /**
+   * Validates a `spine_trim` call against the derived trim projection (the
+   * single eligibility source): unknown, consumed, out-of-window, or
+   * anchor-missing ids reject with a do-not-retry reason. Not a transition —
+   * no per-step budget; the accepted receipt in history IS the trim.
+   */
+  acceptTrim(trimId: string, op: SpineTrimOp): SpineTransitionResult;
+
+  /**
+   * Executes a `spine_spawn` fission: forks one child agent per task, runs them
+   * in parallel, and returns a structured JSON receipt. The receipt landing in
+   * history IS the join; derive synthesizes the closed child nodes from it.
+   * Rejected results surface capacity/validation reasons as errors so the model
+   * can retry.
+   */
+  executeSpawn(
+    tasks: readonly SpineSpawnTaskInput[],
+    signal: AbortSignal,
+  ): Promise<SpineTransitionResult & { readonly receipt?: string }>;
+
   archiveEpochRoot(input: SpineEpochArchiveInput): Promise<string | undefined>;
 
   renderTree(): string;

packages/agent-core-v2/src/agent/spine/spineDerive.ts

@@ -12,15 +12,20 @@
  * sessions; persisted metadata can degrade, so the match is textual and a
  * near-miss does not count — and replays the transitions under the same
  * guards the legacy ops enforced (cursor position, non-empty bodies, root
- * epochs never close). Root-epoch boundaries come from the compaction summary
- * message itself (`origin.kind === 'compaction_summary'`, with the summary
- * prefix text as the fallback carrier when the origin metadata is absent). A
- * closing node's memory is the model-written body verbatim: the projection
- * fold re-materializes the span's surviving user requests and each closed
- * child's own `<spine_memory node_id="...">` slot from the surviving stream,
- * so an undo that rewrites the span rewrites the folded view with it — the
- * memory itself never needs patching. Consumed by `spineService`; the fold
- * projection and archive rendering read this state.
+ * epochs never close). A `spine_spawn` call whose structured JSON receipt lands
+ * in history synthesizes N closed sibling nodes under the current cursor in
+ * input order; every sibling shares the receipt message as a point span
+ * (`openedAt === closedAt === receipt index`), so the first sibling's span
+ * absorbs the receipt tool message and the carrier stays visible in the parent
+ * context. Root-epoch boundaries come from the compaction summary message
+ * itself (`origin.kind === 'compaction_summary'`, with the summary prefix text
+ * as the fallback carrier when the origin metadata is absent). A closing node's
+ * memory is the model-written body verbatim: the projection fold re-materializes
+ * the span's surviving user requests and each closed child's own
+ * `<spine_memory node_id="...">` slot from the surviving stream, so an undo
+ * that rewrites the span rewrites the folded view with it — the memory itself
+ * never needs patching. Consumed by `spineService`; the fold projection and
+ * archive rendering read this state.
  *
  * Silence is the design, not an oversight: a call whose accepted receipt never
  * landed, a receipt whose call is missing, or a transition the guards reject
@@ -28,7 +33,9 @@
  * no lost-commit audit and no repair op. The stream is the whole truth, so a
  * transition the stream does not fully witness is not a transition — the
  * legacy op world needed `reportLostCommits` precisely because it kept a
- * second record that could disagree with the receipts.
+ * second record that could disagree with the receipts. `spine_spawn` receipts
+ * are all-or-nothing in the same spirit: a malformed or partially-invalid
+ * receipt is ignored entirely, synthesizing zero nodes.
  */
 
 import {
@@ -38,7 +45,7 @@ import {
 import type { ContextMessage } from '#/agent/contextMemory/types';
 
 import { SPINE_TOOL_CLOSE, SPINE_TOOL_NEXT, SPINE_TOOL_OPEN } from './spine';
-import type { SpineNode, SpineState } from './spineOps';
+import type { SpineNode, SpineSpawnEvidence, SpineState } from './spineOps';
 import {
   childNodeId,
   epochStartupNodeId,
@@ -52,8 +59,12 @@ import { ACCEPTED_OUTPUT } from './tools/controlResult';
 /** Receipt left by sessions predating the delayed-commit receipt wording. */
 const LEGACY_ACCEPTED_RECEIPT = 'accepted';
 
+/** Tool name for the parallel-branch spawn control call. */
+const SPINE_TOOL_SPAWN = 'spine_spawn';
+
 export function deriveSpineState(messages: readonly ContextMessage[]): SpineState {
   const accepted = collectAcceptedCallIds(messages);
+  const spawnReceipts = collectSpawnReceipts(messages);
   const nodes: Record<string, SpineNode> = {};
   let openStack: readonly string[] = [];
   let rootEpoch = 0;
@@ -137,6 +148,38 @@ export function deriveSpineState(messages: readonly ContextMessage[]): SpineStat
     openStack = [...openStack.slice(0, -1), openedId];
   }
 
+  function spawnNodes(parentId: string, spawn: SpawnReceiptInfo): void {
+    const parent = nodes[parentId];
+    if (parent === undefined || parent.closedAt !== undefined) return;
+    const receiptAt = spawn.receiptAt;
+    let childIndex = nextChildIndex(parent.children);
+    const newChildren: string[] = [];
+    const newNodes: Record<string, SpineNode> = {};
+    for (const result of spawn.results) {
+      const id = childNodeId(parentId, childIndex);
+      const spawnEvidence: SpineSpawnEvidence = {
+        summary: result.summary,
+        outcome: result.outcome,
+      };
+      newNodes[id] = {
+        id,
+        summary: result.summary,
+        openedAt: receiptAt,
+        closedAt: receiptAt,
+        memory: result.memoryBody,
+        spawn:
+          result.diagnostic === undefined
+            ? spawnEvidence
+            : { ...spawnEvidence, diagnostic: result.diagnostic },
+        children: [],
+      };
+      newChildren.push(id);
+      childIndex += 1;
+    }
+    nodes[parentId] = { ...parent, children: [...parent.children, ...newChildren] };
+    Object.assign(nodes, newNodes);
+  }
+
   openEpoch(1, 0);
   for (let i = 0; i < messages.length; i++) {
     const message = messages[i];
@@ -149,6 +192,14 @@ export function deriveSpineState(messages: readonly ContextMessage[]): SpineStat
     }
     if (message.role !== 'assistant') continue;
     for (const call of message.toolCalls) {
+      if (call.name === SPINE_TOOL_SPAWN) {
+        const spawn = spawnReceipts.get(call.id);
+        if (spawn !== undefined) {
+          const parentId = openStack.at(-1);
+          if (parentId !== undefined) spawnNodes(parentId, spawn);
+        }
+        continue;
+      }
       if (!accepted.has(call.id)) continue;
       const args = parseTransitionArgs(call.arguments);
       if (args === undefined) continue;
@@ -212,6 +263,129 @@ function isSpineTransitionTool(name: string): boolean {
   return name === SPINE_TOOL_OPEN || name === SPINE_TOOL_CLOSE || name === SPINE_TOOL_NEXT;
 }
 
+interface SpawnTask {
+  readonly summary: string;
+  readonly prompt: string;
+}
+
+interface SpawnCallInfo {
+  readonly carrierAt: number;
+  readonly tasks: readonly SpawnTask[];
+}
+
+interface SpawnResult {
+  readonly summary: string;
+  readonly outcome: 'completed' | 'errored' | 'aborted';
+  readonly memoryBody: string;
+  readonly diagnostic?: string;
+}
+
+interface SpawnReceiptInfo {
+  readonly receiptAt: number;
+  readonly results: readonly SpawnResult[];
+}
+
+function parseSpawnArgs(raw: string | null | undefined): readonly SpawnTask[] | undefined {
+  if (raw === undefined || raw === null) return undefined;
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(raw);
+  } catch {
+    return undefined;
+  }
+  if (typeof parsed !== 'object' || parsed === null) return undefined;
+  const record = parsed as Record<string, unknown>;
+  const tasksRaw = record['tasks'];
+  if (!Array.isArray(tasksRaw) || tasksRaw.length < 2) return undefined;
+  const tasks: SpawnTask[] = [];
+  for (const item of tasksRaw) {
+    if (typeof item !== 'object' || item === null) return undefined;
+    const itemRecord = item as Record<string, unknown>;
+    const summary = itemRecord['summary'];
+    const prompt = itemRecord['prompt'];
+    if (typeof summary !== 'string' || typeof prompt !== 'string') return undefined;
+    tasks.push({ summary, prompt });
+  }
+  return tasks;
+}
+
+function collectSpawnReceipts(
+  messages: readonly ContextMessage[],
+): ReadonlyMap<string, SpawnReceiptInfo> {
+  const calls = new Map<string, SpawnCallInfo>();
+  for (let i = 0; i < messages.length; i++) {
+    const message = messages[i];
+    if (message === undefined || message.role !== 'assistant') continue;
+    for (const call of message.toolCalls) {
+      if (call.name !== SPINE_TOOL_SPAWN) continue;
+      const tasks = parseSpawnArgs(call.arguments);
+      if (tasks !== undefined) calls.set(call.id, { carrierAt: i, tasks });
+    }
+  }
+  const receipts = new Map<string, SpawnReceiptInfo>();
+  for (let i = 0; i < messages.length; i++) {
+    const message = messages[i];
+    if (message === undefined || message.role !== 'tool') continue;
+    const callId = message.toolCallId;
+    if (callId === undefined) continue;
+    const call = calls.get(callId);
+    if (call === undefined) continue;
+    if (message.isError === true) continue;
+    const validated = validateSpawnReceipt(call.tasks, messageText(message), i);
+    if (validated !== undefined) receipts.set(callId, validated);
+  }
+  return receipts;
+}
+
+function validateSpawnReceipt(
+  tasks: readonly SpawnTask[],
+  receiptText: string,
+  receiptAt: number,
+): SpawnReceiptInfo | undefined {
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(receiptText);
+  } catch {
+    return undefined;
+  }
+  if (typeof parsed !== 'object' || parsed === null) return undefined;
+  const record = parsed as Record<string, unknown>;
+  if (record['schema'] !== 'spine.spawn.result.v1') return undefined;
+  const resultsRaw = record['results'];
+  if (!Array.isArray(resultsRaw) || resultsRaw.length < 2 || resultsRaw.length !== tasks.length) {
+    return undefined;
+  }
+  const results: SpawnResult[] = [];
+  const seenOrdinals = new Set<number>();
+  for (const item of resultsRaw) {
+    if (typeof item !== 'object' || item === null) return undefined;
+    const itemRecord = item as Record<string, unknown>;
+    const ordinal = itemRecord['ordinal'];
+    if (typeof ordinal !== 'number' || !Number.isInteger(ordinal)) return undefined;
+    if (ordinal < 0 || ordinal >= tasks.length || seenOrdinals.has(ordinal)) return undefined;
+    seenOrdinals.add(ordinal);
+    const outcome = itemRecord['outcome'];
+    if (outcome !== 'completed' && outcome !== 'errored' && outcome !== 'aborted') return undefined;
+    const memoryBody = itemRecord['memory_body'];
+    if (typeof memoryBody !== 'string' || memoryBody.length === 0) return undefined;
+    const diagnostic = itemRecord['diagnostic'];
+    if (diagnostic !== undefined && (typeof diagnostic !== 'string' || diagnostic.length === 0)) {
+      return undefined;
+    }
+    if (outcome !== 'completed' && diagnostic === undefined) return undefined;
+    const task = tasks[ordinal];
+    if (task === undefined || task.summary.trim().length === 0) return undefined;
+    results[ordinal] = {
+      summary: task.summary,
+      outcome,
+      memoryBody,
+      diagnostic,
+    };
+  }
+  if (seenOrdinals.size !== tasks.length) return undefined;
+  return { receiptAt, results };
+}
+
 function isEpochBoundary(message: ContextMessage): boolean {
   if (message.role !== 'user') return false;
   if (isCompactionSummaryMessage(message)) return true;

packages/agent-core-v2/src/agent/spine/spineFold.ts

@@ -14,31 +14,42 @@
  *   inside its span survive in place with their original message identity
  *   (text AND media parts preserved), each nested closed node contributes its
  *   own `<spine_memory node_id="...">` slot, and the node's own memory lands
- *   last — the same slot layout the upstream `assemble_memory` produces.
+ *   last — the same slot layout the upstream `assemble_memory` produces. Nodes
+ *   synthesized from a `spine_spawn` receipt additionally render an evidence
+ *   line `<spine_spawn_evidence node_id="..." summary="..." outcome="..." />`
+ *   before their memory slot; the receipt tool message is absorbed by the
+ *   point span and never reaches the projection.
  *
  * Real user requests carry stable `[U#]` anchors: every request in the stored
  * history consumes its ordinal even when an epoch boundary folds it away, so a
  * surviving request keeps the same anchor across projections and across the
- * close that folds its span. A synthetic `<spine_status>` orientation line
- * closes the view. The stored history is never mutated; token numbers for the
- * status line are precomputed by the `spine` service and passed in. Consumed
- * by `spineService.fold`.
+ * close that folds its span. Tool messages in live ranges additionally pass
+ * the trim projection (when given): oversized results keep their full body
+ * behind a byte-stable `[TRIM_ID: trim_N]` label, and accepted trims render
+ * as the cleared placeholder or a kept slice. A synthetic `<spine_status>`
+ * orientation line closes the view. The stored history is never mutated;
+ * token numbers for the status line are precomputed by the `spine` service
+ * and passed in. Consumed by `spineService.fold`.
  *
  * Span invariants (mirroring the upstream reducer): a closed span ends BEFORE
  * the assistant message carrying the close/next call, so the carrier, its
  * receipt, and any slower batched tool results stay visible and paired in the
  * parent context; a `spine.next` sibling opens at the carrier's index, so
- * next-chain spans are disjoint and contiguous. A span closed entirely before
- * the current epoch is owned by the epoch summary and skipped silently — left
- * queued, it would pin the level walk and keep every post-epoch span raw
- * forever. The synthetic root-epoch node and truncation-voided nodes
- * (`openedAt < 0`) never produce landmarks or spans.
+ * next-chain spans are disjoint and contiguous. `spine_spawn` siblings share a
+ * point span at the receipt message, so the first sibling absorbs the receipt
+ * into its closed range and the carrier stays visible in the parent context.
+ * A span closed entirely before the current epoch is owned by the epoch
+ * summary and skipped silently — left queued, it would pin the level walk and
+ * keep every post-epoch span raw forever. The synthetic root-epoch node and
+ * truncation-voided nodes (`openedAt < 0`) never produce landmarks or spans.
  */
 
 import type { ContextMessage } from '#/agent/contextMemory/types';
 import type { ContentPart } from '#/kosong/contract/message';
 
-import type { SpineNode, SpineState } from './spineOps';
+import type { SpineNode, SpineSpawnEvidence, SpineState } from './spineOps';
+import type { SpineTrimProjection } from './spineTrimDerive';
+import { applySpineTrim } from './spineTrimFold';
 
 export interface SpineFoldStatus {
   readonly cursorId: string;
@@ -62,6 +73,8 @@ export interface SpineFoldInput {
   readonly state: SpineState;
   readonly epochSummaryMessage?: ContextMessage;
   readonly status?: SpineFoldStatus;
+  /** Derived trim projection applied to tool messages in live ranges. */
+  readonly trim?: SpineTrimProjection;
 }
 
 export function foldSpine(
@@ -74,6 +87,7 @@ export function foldSpine(
     state,
     anchors: userRequestAnchors(messages),
     epochStartAt: state.epochStartAt,
+    trim: input.trim,
   };
   const out: ContextMessage[] = [];
 
@@ -104,6 +118,7 @@ interface FoldContext {
   /** `[U#]` ordinal per message index (0 = not a real user request). */
   readonly anchors: readonly number[];
   readonly epochStartAt: number;
+  readonly trim: SpineTrimProjection | undefined;
 }
 
 type SpanSink = (ctx: FoldContext, index: number, out: ContextMessage[]) => void;
@@ -154,7 +169,11 @@ function renderNode(
   }
   // A closed node folds: real user requests inside the span survive in place
   // (media included), nested closed nodes render their own slots, and the
-  // node's own memory lands last.
+  // node's own memory lands last. Spawned nodes prefix their memory with an
+  // evidence line.
+  if (node.spawn !== undefined) {
+    out.push(spineSpawnEvidenceMessage(node, node.spawn));
+  }
   walkChildren(ctx, node.children, lo, hi, out, pushSurvivingUserRequest);
   const memoryMessage = spineMemoryMessage(node);
   if (memoryMessage !== undefined) out.push(memoryMessage);
@@ -165,7 +184,8 @@ function pushRaw(ctx: FoldContext, index: number, out: ContextMessage[]): void {
   const message = ctx.messages[index];
   if (message === undefined) return;
   const anchor = ctx.anchors[index] ?? 0;
-  out.push(anchor > 0 ? annotateUserRequest(message, anchor) : message);
+  const surviving = anchor > 0 ? annotateUserRequest(message, anchor) : message;
+  out.push(ctx.trim === undefined ? surviving : applySpineTrim(ctx.trim, index, surviving));
 }
 
 /** Folded-range sink: only real user requests survive, tagged and original. */
@@ -181,7 +201,7 @@ export function isUserRequest(message: ContextMessage): boolean {
 }
 
 function userRequestAnchors(messages: readonly ContextMessage[]): readonly number[] {
-  const anchors: number[] = new Array<number>(messages.length).fill(0);
+  const anchors: number[] = Array.from({ length: messages.length }, () => 0);
   let anchor = 0;
   for (let i = 0; i < messages.length; i++) {
     const message = messages[i];
@@ -220,6 +240,23 @@ function spineMemoryMessage(node: SpineNode): ContextMessage | undefined {
   };
 }
 
+function spineSpawnEvidenceMessage(
+  node: SpineNode,
+  spawn: SpineSpawnEvidence,
+): ContextMessage {
+  const diagnostic =
+    spawn.diagnostic === undefined ? '' : ` diagnostic="${escapeAttr(spawn.diagnostic)}"`;
+  const text = `<spine_spawn_evidence node_id="${node.id}" summary="${escapeAttr(
+    spawn.summary,
+  )}" outcome="${spawn.outcome}"${diagnostic} />`;
+  return {
+    role: 'user',
+    content: [{ type: 'text', text }],
+    toolCalls: [],
+    origin: { kind: 'injection', variant: 'spine_spawn_evidence' },
+  };
+}
+
 function annotateUserRequest(message: ContextMessage, anchorNumber: number): ContextMessage {
   const anchor = `[U${String(anchorNumber)}] `;
   const content = prefixFirstText(message.content, anchor);

packages/agent-core-v2/src/agent/spine/spineOps.ts

@@ -13,6 +13,10 @@
  * open-node stack (its top is the cursor), and the current root-epoch
  * boundary, with `openedAt`/`closedAt` indexing the stored history. Consumed
  * by the Agent-scope `spineService` and the `spineFold` projection.
+ *
+ * `SpineNode.spawn` is an optional evidence field produced only by the
+ * derivation for nodes synthesized from a `spine_spawn` receipt. The legacy
+ * op reducers below never create it and always leave it undefined.
  */
 
 import { z } from 'zod';
@@ -25,6 +29,12 @@ import {
   SPINE_VOID_OPENED_AT,
 } from './spineTree';
 
+export interface SpineSpawnEvidence {
+  readonly summary: string;
+  readonly outcome: 'completed' | 'errored' | 'aborted';
+  readonly diagnostic?: string;
+}
+
 export interface SpineNode {
   readonly id: string;
   readonly summary: string;
@@ -34,6 +44,7 @@ export interface SpineNode {
   readonly archivePath?: string;
   readonly baselineTokens?: number;
   readonly finalTokens?: number;
+  readonly spawn?: SpineSpawnEvidence;
   readonly children: readonly string[];
 }
 

packages/agent-core-v2/src/agent/spine/spineService.ts

@@ -31,8 +31,13 @@
  * so a restore re-derives them and the first post-restore sweep rewrites any
  * archive a crash lost. Persistence failures are never swallowed: a failed
  * archive write is reported through `onUnexpectedError`, and the node's memory
- * carries the failure note in the projection from then on. Renders the
- * read-only `spine_tree` view across every root epoch (current first by
+ * carries the failure note in the projection from then on. It also owns the
+ * tool-response trim projection (gated on `KIMI_CODE_SPINE_TRIM`): the same
+ * stream derives the oversized-result tags and replays the accepted
+ * `spine_trim` receipts (`deriveSpineTrimProjection`), the fold renders them,
+ * and `acceptTrim` validates calls against that same derivation — one
+ * eligibility source for rendering and validation. Renders the read-only
+ * `spine_tree` view across every root epoch (current first by
  * numeric order), so a superseded epoch's closed-node archives stay
  * discoverable after a root compaction. Registers its history fold into
  * `contextProjector` and its `<spine_view>` prompt block into `llmRequester`
@@ -63,14 +68,17 @@ import { IEventBus } from '#/app/event/eventBus';
 import { IFlagService } from '#/app/flag/flag';
 import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { IHostFileSystem } from '#/os/interface/hostFileSystem';
+import { IAgentLifecycleService } from '#/session/agentLifecycle/agentLifecycle';
 import { ISessionContext } from '#/session/sessionContext/sessionContext';
+import { ISessionSubagentService } from '#/session/subagent/subagent';
 import { IWireService } from '#/wire/wire';
 
-import { SPINE_FLAG_ID } from './flag';
+import { SPINE_FLAG_ID, SPINE_SPAWN_FLAG_ID, SPINE_TRIM_FLAG_ID } from './flag';
 import { appendSpineView, loadSpineViewOverride } from './instructions';
 import {
   IAgentSpineService,
   SPINE_TOOL_OPEN,
+  type SpineSpawnTaskInput,
   type SpineTransitionResult,
 } from './spine';
 import {
@@ -81,6 +89,11 @@ import {
   type SpineEpochArchiveInput,
 } from './spineArchive';
 import { deriveSpineState } from './spineDerive';
+import {
+  deriveSpineTrimProjection,
+  type SpineTrimOp,
+  type SpineTrimProjection,
+} from './spineTrimDerive';
 import { foldSpine, type SpineFoldStatus } from './spineFold';
 import { type SpineNode, type SpineState } from './spineOps';
 import {
@@ -93,6 +106,13 @@ import {
   spineNodeViewFromState,
   type SpineTreeViewInput,
 } from './spineTree';
+import {
+  executeSpawnBranches,
+  maxSpawnBranchCount,
+  resolveMaxThreads,
+  SPINE_SPAWN_MAX_THREADS_ENV,
+  type SpawnBranchResult,
+} from './spineSpawn';
 
 const REJECT_DISABLED: SpineTransitionResult = {
   accepted: false,
@@ -111,6 +131,16 @@ const REJECT_ROOT_EPOCH: SpineTransitionResult = {
     'Root-epoch nodes cannot be closed. Use open to start a child node under the current scope.',
 };
 
+const REJECT_TRIM_DISABLED: SpineTransitionResult = {
+  accepted: false,
+  reason: 'Spine trim is disabled. Set KIMI_CODE_SPINE_TRIM=1 to enable it.',
+};
+
+const REJECT_SPAWN_DISABLED: SpineTransitionResult = {
+  accepted: false,
+  reason: 'Spine spawn is disabled. Set KIMI_CODE_SPINE_SPAWN=1 to enable it.',
+};
+
 const ARCHIVE_FAILURE_NOTE =
   '[spine: the trajectory archive for this node could not be written; its detailed history was not persisted.]';
 
@@ -121,6 +151,8 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
   private transitionThisStep = false;
   private cachedMessages: readonly ContextMessage[] | undefined;
   private cachedState: SpineState | undefined;
+  private cachedTrimMessages: readonly ContextMessage[] | undefined;
+  private cachedTrimProjection: SpineTrimProjection | undefined;
   /**
    * Ephemeral per-node token gauges, recorded at accept time. Token baselines
    * are not in the message stream, so pure derivation cannot recover them —
@@ -147,6 +179,11 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
   private readonly failedArchiveIds = new Set<string>();
   private spineViewOverride: string | undefined;
   private spineViewReady: Promise<void> = Promise.resolve();
+  /**
+   * Number of child agents currently running as part of an in-flight
+   * `spine_spawn` fission. Ephemeral: reset at step bounds and on restore.
+   */
+  private activeSpawnBranches = 0;
 
   constructor(
     @IAgentContextMemoryService private readonly context: IAgentContextMemoryService,
@@ -160,6 +197,8 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
     @IAgentScopeContext private readonly agentScope: IAgentScopeContext,
     @IWireService private readonly wire: IWireService,
     @IEventBus private readonly eventBus: IEventBus,
+    @IAgentLifecycleService private readonly lifecycle: IAgentLifecycleService,
+    @ISessionSubagentService private readonly subagentService: ISessionSubagentService,
     @IAgentLoopService loop: IAgentLoopService,
     @IAgentContextProjectorService projector: IAgentContextProjectorService,
     @IAgentLLMRequesterService llmRequester: IAgentLLMRequesterService,
@@ -213,10 +252,13 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
         // close and its sweep self-heals.
         this.cachedMessages = undefined;
         this.cachedState = undefined;
+        this.cachedTrimMessages = undefined;
+        this.cachedTrimProjection = undefined;
         this.baselines.clear();
         this.finals.clear();
         this.archivedIds.clear();
         this.failedArchiveIds.clear();
+        this.activeSpawnBranches = 0;
         await next();
       }),
     );
@@ -242,6 +284,75 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
     return this.flags.enabled(SPINE_FLAG_ID);
   }
 
+  get trimEnabled(): boolean {
+    return this.flags.enabled(SPINE_TRIM_FLAG_ID);
+  }
+
+  get spawnEnabled(): boolean {
+    return this.flags.enabled(SPINE_SPAWN_FLAG_ID);
+  }
+
+  executeSpawn(
+    tasks: readonly SpineSpawnTaskInput[],
+    signal: AbortSignal,
+  ): Promise<SpineTransitionResult & { readonly receipt?: string }> {
+    return this.doExecuteSpawn(tasks, signal);
+  }
+
+  private async doExecuteSpawn(
+    tasks: readonly SpineSpawnTaskInput[],
+    signal: AbortSignal,
+  ): Promise<SpineTransitionResult & { readonly receipt?: string }> {
+    if (!this.enabled) return REJECT_DISABLED;
+    if (!this.spawnEnabled) return REJECT_SPAWN_DISABLED;
+
+    const maxThreads = resolveMaxThreads(process.env[SPINE_SPAWN_MAX_THREADS_ENV]);
+    const maxBranches = maxSpawnBranchCount(maxThreads);
+
+    if (tasks.length < 2) {
+      return reject('spine_spawn requires at least 2 tasks.');
+    }
+    if (tasks.length > maxBranches) {
+      return reject(
+        `spine_spawn accepts at most ${String(maxBranches)} tasks under the configured limit of ${String(maxThreads)} threads.`,
+      );
+    }
+
+    // Aggregate capacity admission is checked before the per-step gate so that
+    // an overlapping fission that cannot fit is rejected with the all-or-nothing
+    // reason even while another transition is still in flight.
+    if (this.activeSpawnBranches + tasks.length > maxBranches) {
+      return {
+        accepted: false,
+        reason:
+          `aggregate admission requested ${String(tasks.length)} child agents, but shared capacity was unavailable under the configured limit of ${String(maxBranches)} concurrent child agents. ` +
+          `Admission is all-or-nothing. Retry spine_spawn with fewer tasks after capacity is available, or increase ${SPINE_SPAWN_MAX_THREADS_ENV}.`,
+      };
+    }
+
+    if (this.transitionThisStep) return REJECT_CONFLICT;
+
+    for (const task of tasks) {
+      if (task.summary.trim().length === 0 || task.prompt.trim().length === 0) {
+        return reject('spine_spawn task summary and prompt must not be empty.');
+      }
+    }
+
+    this.transitionThisStep = true;
+    this.activeSpawnBranches += tasks.length;
+    try {
+      const branches = await executeSpawnBranches(
+        { lifecycle: this.lifecycle, subagentService: this.subagentService },
+        tasks,
+        signal,
+      );
+      const receipt = buildSpawnReceipt(branches);
+      return { accepted: true, receipt };
+    } finally {
+      this.activeSpawnBranches -= tasks.length;
+    }
+  }
+
   acceptOpen(summary: string): SpineTransitionResult {
     const guard = this.guard();
     if (guard !== null) return guard;
@@ -293,6 +404,31 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
     return { accepted: true };
   }
 
+  acceptTrim(trimId: string, op: SpineTrimOp): SpineTransitionResult {
+    if (!this.enabled) return REJECT_DISABLED;
+    if (!this.trimEnabled) return REJECT_TRIM_DISABLED;
+    const projection = this.trimProjection();
+    const index = projection.tagIndex.get(trimId);
+    if (index === undefined) {
+      return reject(`Unknown TRIM_ID "${trimId}"; it is not attached to a tool result. Do not retry it.`);
+    }
+    if (projection.consumed.has(trimId)) {
+      return reject(`TRIM_ID "${trimId}" was already trimmed. Do not retry it.`);
+    }
+    if (!projection.eligible.has(trimId)) {
+      return reject(
+        `TRIM_ID "${trimId}" is outside the immediately preceding tool-result batch. Do not retry it.`,
+      );
+    }
+    if (op.kind === 'slice' && op.shape.type === 'anchor') {
+      const target = this.context.get()[index];
+      if (target === undefined || !messageText(target).includes(op.shape.anchor)) {
+        return reject(`Anchor text not found in "${trimId}". Do not retry it.`);
+      }
+    }
+    return { accepted: true };
+  }
+
   renderTree(): string {
     const state = this.state();
     const input = this.treeViewInput();
@@ -308,7 +444,8 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
     const state = this.state();
     const epochSummaryMessage =
       state.epochMemoryAt === undefined ? undefined : messages[state.epochMemoryAt];
-    return foldSpine(messages, { state, status: this.buildStatus(), epochSummaryMessage });
+    const trim = this.trimEnabled ? this.trimProjection() : undefined;
+    return foldSpine(messages, { state, status: this.buildStatus(), epochSummaryMessage, trim });
   }
 
   currentState(): SpineState {
@@ -382,6 +519,22 @@ export class AgentSpineService extends Disposable implements IAgentSpineService
     return state;
   }
 
+  /**
+   * The trim projection over the same stream, cached with the same
+   * reference-equality guard. This is the single eligibility source: the fold
+   * renders it and `acceptTrim` validates against it.
+   */
+  private trimProjection(): SpineTrimProjection {
+    const messages = this.context.get();
+    if (this.cachedTrimProjection !== undefined && this.cachedTrimMessages === messages) {
+      return this.cachedTrimProjection;
+    }
+    const projection = deriveSpineTrimProjection(messages);
+    this.cachedTrimMessages = messages;
+    this.cachedTrimProjection = projection;
+    return projection;
+  }
+
   private cursorId(): string {
     return topOf(this.derivedState());
   }
@@ -532,6 +685,29 @@ function reject(reason: string): SpineTransitionResult {
   return { accepted: false, reason };
 }
 
+interface SpawnReceiptJson {
+  readonly schema: 'spine.spawn.result.v1';
+  readonly results: readonly SpawnReceiptResultJson[];
+}
+
+interface SpawnReceiptResultJson {
+  readonly ordinal: number;
+  readonly outcome: 'completed' | 'errored' | 'aborted';
+  readonly memory_body: string;
+  readonly diagnostic?: string;
+}
+
+function buildSpawnReceipt(branches: readonly SpawnBranchResult[]): string {
+  const results: SpawnReceiptResultJson[] = branches.map((branch, ordinal) => ({
+    ordinal,
+    outcome: branch.outcome,
+    memory_body: branch.memoryBody,
+    diagnostic: branch.diagnostic,
+  }));
+  const receipt: SpawnReceiptJson = { schema: 'spine.spawn.result.v1', results };
+  return JSON.stringify(receipt);
+}
+
 registerScopedService(
   LifecycleScope.Agent,
   IAgentSpineService,

packages/agent-core-v2/src/agent/spine/spineSpawn.ts

@@ -0,0 +1,250 @@
+/**
+ * `spine` domain (L4) — `spine_spawn` fission executor.
+ *
+ * Pure module (not a DI service). `executeSpawnBranches` forks one child agent
+ * per task via `IAgentLifecycleService.fork('main', { trimTrailingToolCallBatch: true })`,
+ * runs each branch with `ISessionSubagentService.run`, and waits for all
+ * completions. Single-branch failures do not propagate: each branch records its
+ * own outcome. The caller (`AgentSpineService`) owns capacity admission and
+ * constructs the `spine.spawn.result.v1` receipt.
+ *
+ * Cache affinity: each forked agent shares the parent's session id through the
+ * Agent-scope `IAgentProfileService.resolveRequestParams`, which uses
+ * `ISessionContext.sessionId` as the prompt-cache key. That is the existing v2
+ * seam; no extra wiring is required here. (If a future provider needs a
+ * different cache key shape, extend `RunAgentOptions` or `ForkAgentOptions`.)
+ */
+
+import type { IAgentScopeHandle } from '#/_base/di/scope';
+import { onUnexpectedError } from '#/_base/errors/unexpectedError';
+import type { IAgentLifecycleService } from '#/session/agentLifecycle/agentLifecycle';
+import type {
+  AgentRunHandle,
+  ISessionSubagentService,
+  RunAgentOptions,
+} from '#/session/subagent/subagent';
+
+import type { SpineSpawnTaskInput } from './spine';
+
+export type SpawnBranchOutcome = 'completed' | 'errored' | 'aborted';
+
+export interface SpawnBranchResult {
+  readonly summary: string;
+  readonly outcome: SpawnBranchOutcome;
+  readonly memoryBody: string;
+  readonly diagnostic?: string;
+}
+
+export interface SpawnExecutorDependencies {
+  readonly lifecycle: IAgentLifecycleService;
+  readonly subagentService: ISessionSubagentService;
+}
+
+const EMPTY_MEMORY_DIAGNOSTIC = 'child completed without a non-empty final memory';
+
+export function taskEnvelope(task: SpineSpawnTaskInput): string {
+  return (
+    'You are one branch of a spine_spawn fission. The original continuation is suspended during this fission; no supervisory model is active.\n' +
+    `Branch label and outcome: ${task.summary}\n` +
+    `Assignment:\n${task.prompt}\n` +
+    'When you finish, return only the terminal memory for this branch.'
+  );
+}
+
+/**
+ * Default aggregate thread limit for spine_spawn fissions. The main agent plus
+ * up to `DEFAULT_MAX_THREADS - 1` concurrent child agents may run; the number of
+ * tasks in one spawn call therefore cannot exceed `DEFAULT_MAX_THREADS - 1`.
+ */
+export const DEFAULT_MAX_THREADS = 4;
+
+/**
+ * Environment variable that overrides the default max thread count.
+ */
+export const SPINE_SPAWN_MAX_THREADS_ENV = 'KIMI_CODE_SPINE_SPAWN_MAX_THREADS';
+
+/**
+ * Parses the configured max thread count, falling back to the default when the
+ * env value is missing, non-numeric, or not a positive integer.
+ */
+export function resolveMaxThreads(raw: string | undefined): number {
+  if (raw === undefined || raw.length === 0) return DEFAULT_MAX_THREADS;
+  const parsed = Number(raw);
+  if (!Number.isInteger(parsed) || parsed < 2) return DEFAULT_MAX_THREADS;
+  return parsed;
+}
+
+/**
+ * Returns the largest number of tasks a single spawn call may admit. The main
+ * agent occupies one thread, leaving `maxThreads - 1` for children.
+ */
+export function maxSpawnBranchCount(maxThreads: number): number {
+  return Math.max(1, maxThreads - 1);
+}
+
+export async function executeSpawnBranches(
+  deps: SpawnExecutorDependencies,
+  tasks: readonly SpineSpawnTaskInput[],
+  signal: AbortSignal,
+): Promise<readonly SpawnBranchResult[]> {
+  const starts = await Promise.all(
+    tasks.map((task) =>
+      startBranch(deps, task, signal).then(
+        (branch): BranchStart => ({ ok: true, branch }),
+        (error: unknown): BranchStart => ({ ok: false, error }),
+      ),
+    ),
+  );
+  const started = starts.flatMap((start) => (start.ok ? [start.branch] : []));
+  try {
+    // A start failure aborts the whole batch: live siblings are cancelled and
+    // reported aborted (the same all-or-nothing shape upstream uses), and every
+    // started agent is still released in the finally below.
+    const batchAborted = starts.some((start) => !start.ok);
+    if (batchAborted) {
+      for (const branch of started) {
+        branch.run.turn.cancel('a sibling branch failed to start');
+      }
+    }
+    const completions = await Promise.allSettled(
+      starts.map((start) =>
+        start.ok ? awaitBranch(start.branch, signal) : Promise.reject(start.error),
+      ),
+    );
+    return completions.map((completion, index) =>
+      finalizeBranch(tasks[index]!, starts[index]!, completion, batchAborted),
+    );
+  } finally {
+    await Promise.all(started.map((branch) => releaseBranch(deps, branch)));
+  }
+}
+
+type BranchStart =
+  | { readonly ok: true; readonly branch: SpawnBranch }
+  | { readonly ok: false; readonly error: unknown };
+
+interface SpawnBranch {
+  readonly task: SpineSpawnTaskInput;
+  readonly handle: IAgentScopeHandle;
+  readonly run: AgentRunHandle;
+}
+
+async function startBranch(
+  deps: SpawnExecutorDependencies,
+  task: SpineSpawnTaskInput,
+  signal: AbortSignal,
+): Promise<SpawnBranch> {
+  const handle = await deps.lifecycle.fork('main', {
+    trimTrailingToolCallBatch: true,
+  });
+  const run = await deps.subagentService.run(
+    handle.id,
+    { kind: 'prompt', prompt: taskEnvelope(task) },
+    { signal } satisfies RunAgentOptions,
+  );
+  return { task, handle, run };
+}
+
+async function awaitBranch(
+  branch: SpawnBranch,
+  signal: AbortSignal,
+): Promise<{ readonly summary: string }> {
+  if (signal.aborted) {
+    branch.run.turn.cancel(signal.reason);
+    throw new AbortError(signal.reason);
+  }
+  return branch.run.completion;
+}
+
+function finalizeBranch(
+  task: SpineSpawnTaskInput,
+  start: BranchStart,
+  completion: PromiseSettledResult<{ readonly summary: string }>,
+  batchAborted: boolean,
+): SpawnBranchResult {
+  if (!start.ok) {
+    const message = start.error instanceof Error ? start.error.message : String(start.error);
+    return {
+      summary: task.summary,
+      outcome: 'errored',
+      memoryBody: message,
+      diagnostic: message,
+    };
+  }
+  if (completion.status === 'rejected') {
+    if (batchAborted) {
+      const message = 'branch aborted: a sibling branch failed to start';
+      return {
+        summary: task.summary,
+        outcome: 'aborted',
+        memoryBody: message,
+        diagnostic: message,
+      };
+    }
+    const reason = extractReason(completion.reason);
+    return {
+      summary: task.summary,
+      outcome: reason.kind === 'abort' ? 'aborted' : 'errored',
+      memoryBody: reason.message,
+      diagnostic: reason.message,
+    };
+  }
+  const summary = completion.value.summary.trim();
+  if (summary.length === 0) {
+    return {
+      summary: task.summary,
+      outcome: 'errored',
+      memoryBody: EMPTY_MEMORY_DIAGNOSTIC,
+      diagnostic: EMPTY_MEMORY_DIAGNOSTIC,
+    };
+  }
+  return {
+    summary: task.summary,
+    outcome: 'completed',
+    memoryBody: summary,
+  };
+}
+
+async function releaseBranch(
+  deps: SpawnExecutorDependencies,
+  branch: SpawnBranch,
+): Promise<void> {
+  try {
+    await deps.lifecycle.remove(branch.handle.id);
+  } catch (error) {
+    // A release failure must not mask the batch's results; the receipt is the
+    // join's only record, so report and move on.
+    onUnexpectedError(error);
+  }
+}
+
+interface RejectionReason {
+  readonly kind: 'abort' | 'error';
+  readonly message: string;
+}
+
+function extractReason(reason: unknown): RejectionReason {
+  const message = reason instanceof Error ? reason.message : String(reason);
+  if (isAbortReason(reason)) return { kind: 'abort', message };
+  return { kind: 'error', message };
+}
+
+function isAbortReason(reason: unknown): boolean {
+  if (reason instanceof Error && reason.name === 'AbortError') return true;
+  if (
+    typeof reason === 'object' &&
+    reason !== null &&
+    'name' in reason &&
+    reason.name === 'AbortError'
+  ) {
+    return true;
+  }
+  return false;
+}
+
+class AbortError extends Error {
+  constructor(reason: unknown) {
+    super(reason instanceof Error ? reason.message : String(reason));
+    this.name = 'AbortError';
+  }
+}

packages/agent-core-v2/src/agent/spine/spineTrimDerive.ts

@@ -0,0 +1,218 @@
+/**
+ * `spine` domain (L4) — derives the tool-response trim projection purely from
+ * the stored `contextMemory` message stream.
+ *
+ * The trim projection is a second, independent read of the same stream the
+ * tree derivation reads: no persisted ops, no commit protocol — a `spine_trim`
+ * call whose accepted receipt landed in history IS the trim, and an undo that
+ * removes the call or the receipt removes the trim with it. Tagging is
+ * automatic: every tool result larger than `SPINE_TRIM_THRESHOLD_BYTES` that
+ * does not answer a `spine_*` control tool and carries text-only content gets
+ * the next `trim_N` id in stream order, so the id a message carries stays
+ * stable across projections for as long as the history before it does.
+ * Trimming itself is model-driven and one-shot: the host validates a call
+ * against the derived eligibility window, and the accepted receipt consumes
+ * the id forever.
+ *
+ * Eligibility is deliberately NOT the projection. The `[TRIM_ID: trim_N]`
+ * label renders byte-stable for as long as the result survives the tree fold
+ * — an id that has left the window stays visible but loses its trimmability —
+ * while the window is derived separately here: the tags of the most recent
+ * COMPLETED tool-call batch (every call answered; an aborted batch never
+ * shifts the window, and interleaved assistant text never expires it either).
+ * Host validation (`AgentSpineService.acceptTrim`) reads this same
+ * derivation, so rendering and validation share exactly one eligibility
+ * source. Consumed by `spineTrimFold` (rendering) and `spineService`
+ * (validation).
+ */
+
+import type { ContextMessage } from '#/agent/contextMemory/types';
+
+import { SPINE_TOOL_TRIM } from './spine';
+import { TRIM_ACCEPTED_OUTPUT } from './tools/controlResult';
+
+/**
+ * Tool results larger than this (UTF-8 bytes of joined text) get a trim tag.
+ * Matches the upstream `TOOL_RESPONSE_TRIM_THRESHOLD_BYTES`.
+ */
+export const SPINE_TRIM_THRESHOLD_BYTES = 10 * 1024;
+
+export type SpineTrimSliceShape =
+  | { readonly type: 'head'; readonly chars: number }
+  | { readonly type: 'tail'; readonly chars: number }
+  | {
+      readonly type: 'anchor';
+      readonly anchor: string;
+      readonly preceding: number;
+      readonly following: number;
+    };
+
+export type SpineTrimOp =
+  | { readonly kind: 'snip' }
+  | { readonly kind: 'slice'; readonly shape: SpineTrimSliceShape };
+
+export interface SpineTrimProjection {
+  /** Tool-message index → trim id, while the message survives the tree fold. */
+  readonly labels: ReadonlyMap<number, string>;
+  /** Trim id → tool-message index. */
+  readonly tagIndex: ReadonlyMap<string, number>;
+  /** Tool-message index → accepted trim (a mask wins over the label). */
+  readonly masks: ReadonlyMap<number, SpineTrimOp>;
+  /** Ids trimmable right now: the last completed batch's unconsumed tags. */
+  readonly eligible: ReadonlySet<string>;
+  /** Ids consumed by an accepted trim, however long ago. */
+  readonly consumed: ReadonlySet<string>;
+}
+
+export function deriveSpineTrimProjection(
+  messages: readonly ContextMessage[],
+): SpineTrimProjection {
+  const callNames = new Map<string, string>();
+  const trimCalls = new Map<string, SpineTrimCallArgs>();
+  const labels = new Map<number, string>();
+  const tagIndex = new Map<string, number>();
+  const masks = new Map<number, SpineTrimOp>();
+  const consumed = new Set<string>();
+  let eligible = new Set<string>();
+  let pendingCalls = new Set<string>();
+  let batchTags: string[] = [];
+  let tagCounter = 0;
+
+  for (let i = 0; i < messages.length; i++) {
+    const message = messages[i];
+    if (message === undefined) continue;
+    if (message.role === 'assistant' && message.toolCalls.length > 0) {
+      // A new batch starts: the previous one can no longer gain receipts, so
+      // it shifts the eligibility window only if it completed. An aborted
+      // batch (calls left unanswered) leaves the window where it was.
+      if (pendingCalls.size === 0) eligible = new Set(batchTags);
+      pendingCalls = new Set<string>();
+      batchTags = [];
+      for (const call of message.toolCalls) {
+        callNames.set(call.id, call.name);
+        pendingCalls.add(call.id);
+        if (call.name === SPINE_TOOL_TRIM) {
+          const args = parseTrimCallArgs(call.arguments);
+          if (args !== undefined) trimCalls.set(call.id, args);
+        }
+      }
+      continue;
+    }
+    if (message.role !== 'tool') continue;
+    const callId = message.toolCallId;
+    if (callId === undefined) continue;
+    pendingCalls.delete(callId);
+    const name = callNames.get(callId);
+    if (name === SPINE_TOOL_TRIM) {
+      if (message.isError === true) continue;
+      if (messageText(message) !== TRIM_ACCEPTED_OUTPUT) continue;
+      const args = trimCalls.get(callId);
+      const target = args === undefined ? undefined : tagIndex.get(args.trimId);
+      if (args === undefined || target === undefined || consumed.has(args.trimId)) continue;
+      masks.set(target, args.op);
+      consumed.add(args.trimId);
+      continue;
+    }
+    if (name === undefined || name.startsWith('spine_')) continue;
+    if (!message.content.every((part) => part.type === 'text')) continue;
+    const text = messageText(message);
+    if (utf8Length(text) <= SPINE_TRIM_THRESHOLD_BYTES) continue;
+    tagCounter += 1;
+    const tag = `trim_${String(tagCounter)}`;
+    labels.set(i, tag);
+    tagIndex.set(tag, i);
+    batchTags.push(tag);
+  }
+  // A tail batch still waiting for receipts never shifts the window, so a
+  // trim call validates against the batch that precedes its own.
+  if (pendingCalls.size === 0) eligible = new Set(batchTags);
+
+  return { labels, tagIndex, masks, eligible, consumed };
+}
+
+/**
+ * Normalizes the flat tool arguments into a trim op; returns undefined for a
+ * malformed shape (a `slice` must name exactly one of head / tail / anchor).
+ * Shared by the derivation (parsing stored calls) and the `spine_trim` tool
+ * (validating fresh input), so a call the tool rejects can never parse here.
+ */
+export function normalizeTrimOp(
+  op: string,
+  shape: {
+    readonly head?: number | undefined;
+    readonly tail?: number | undefined;
+    readonly anchor?: string | undefined;
+    readonly preceding?: number | undefined;
+    readonly following?: number | undefined;
+  },
+): SpineTrimOp | undefined {
+  if (op === 'snip') return { kind: 'snip' };
+  if (op !== 'slice') return undefined;
+  const slices: SpineTrimSliceShape[] = [];
+  if (shape.head !== undefined) slices.push({ type: 'head', chars: shape.head });
+  if (shape.tail !== undefined) slices.push({ type: 'tail', chars: shape.tail });
+  if (shape.anchor !== undefined) {
+    slices.push({
+      type: 'anchor',
+      anchor: shape.anchor,
+      preceding: shape.preceding ?? 0,
+      following: shape.following ?? 0,
+    });
+  }
+  if (slices.length !== 1) return undefined;
+  const slice = slices[0];
+  if (slice === undefined) return undefined;
+  return { kind: 'slice', shape: slice };
+}
+
+interface SpineTrimCallArgs {
+  readonly trimId: string;
+  readonly op: SpineTrimOp;
+}
+
+function parseTrimCallArgs(raw: string | null): SpineTrimCallArgs | undefined {
+  if (raw === null) return undefined;
+  let parsed: unknown;
+  try {
+    parsed = JSON.parse(raw);
+  } catch {
+    return undefined;
+  }
+  if (typeof parsed !== 'object' || parsed === null) return undefined;
+  const record = parsed as Record<string, unknown>;
+  const trimId = record['TRIM_ID'];
+  if (typeof trimId !== 'string' || trimId.length === 0) return undefined;
+  const op = record['op'];
+  if (typeof op !== 'string') return undefined;
+  const normalized = normalizeTrimOp(op, {
+    head: positiveInt(record['head']),
+    tail: positiveInt(record['tail']),
+    anchor: nonEmptyString(record['anchor']),
+    preceding: nonNegativeInt(record['preceding']),
+    following: nonNegativeInt(record['following']),
+  });
+  if (normalized === undefined) return undefined;
+  return { trimId, op: normalized };
+}
+
+function positiveInt(value: unknown): number | undefined {
+  return typeof value === 'number' && Number.isInteger(value) && value > 0 ? value : undefined;
+}
+
+function nonNegativeInt(value: unknown): number | undefined {
+  return typeof value === 'number' && Number.isInteger(value) && value >= 0 ? value : undefined;
+}
+
+function nonEmptyString(value: unknown): string | undefined {
+  return typeof value === 'string' && value.length > 0 ? value : undefined;
+}
+
+const encoder = new TextEncoder();
+
+function utf8Length(text: string): number {
+  return encoder.encode(text).length;
+}
+
+function messageText(message: ContextMessage): string {
+  return message.content.map((part) => (part.type === 'text' ? part.text : '')).join('');
+}

packages/agent-core-v2/src/agent/spine/spineTrimFold.ts

@@ -0,0 +1,99 @@
+/**
+ * `spine` domain (L4) — renders the derived trim projection onto the messages
+ * that survive the tree fold.
+ *
+ * Three renderings, each byte-stable until a mask lands: an untrimmed
+ * oversized result keeps its full body behind a `[TRIM_ID: trim_N]` label —
+ * the label stays visible after the id leaves the eligibility window, because
+ * visibility is the projection and trimmability is not; a snipped result
+ * collapses to the upstream cleared placeholder; a sliced result renders only
+ * the kept head / tail / anchor window with the label gone, so a trimmed
+ * result can never be trimmed again. Pure mapping over stored messages — the
+ * stored history is never mutated. Consumed by `spineFold`'s live-range sink.
+ */
+
+import type { ContextMessage } from '#/agent/contextMemory/types';
+import type { ContentPart } from '#/kosong/contract/message';
+
+import type { SpineTrimOp, SpineTrimProjection, SpineTrimSliceShape } from './spineTrimDerive';
+
+/** Placeholder body of a snipped result — verbatim upstream wording. */
+export const SPINE_TRIM_SNIPPED_PLACEHOLDER = '[Old tool result content cleared]';
+
+export function applySpineTrim(
+  projection: SpineTrimProjection,
+  index: number,
+  message: ContextMessage,
+): ContextMessage {
+  const mask = projection.masks.get(index);
+  if (mask !== undefined) return maskMessage(message, mask);
+  const tag = projection.labels.get(index);
+  if (tag === undefined) return message;
+  return { ...message, content: prefixFirstText(message.content, `[TRIM_ID: ${tag}]\n`) };
+}
+
+function maskMessage(message: ContextMessage, op: SpineTrimOp): ContextMessage {
+  const text =
+    op.kind === 'snip' ? SPINE_TRIM_SNIPPED_PLACEHOLDER : sliceText(messageText(message), op.shape);
+  return { ...message, content: [{ type: 'text', text }] };
+}
+
+/**
+ * Applies a slice shape to a body. head / tail count CHARACTERS (code points,
+ * so a surrogate pair is never split); an anchor window keeps complete LINES:
+ * the line the anchor starts on plus `preceding` / `following` full lines
+ * around it. An anchor the body does not contain renders the body unchanged —
+ * host validation rejects such calls before their receipt can land, so this
+ * branch is only a degraded-history fallback.
+ */
+function sliceText(text: string, shape: SpineTrimSliceShape): string {
+  switch (shape.type) {
+    case 'head':
+      return Array.from(text).slice(0, shape.chars).join('');
+    case 'tail': {
+      const chars = Array.from(text);
+      return chars.slice(Math.max(0, chars.length - shape.chars)).join('');
+    }
+    case 'anchor': {
+      const window = anchorWindow(text, shape.anchor, shape.preceding, shape.following);
+      return window ?? text;
+    }
+  }
+}
+
+function anchorWindow(
+  text: string,
+  anchor: string,
+  preceding: number,
+  following: number,
+): string | undefined {
+  const at = text.indexOf(anchor);
+  if (at < 0) return undefined;
+  // The anchor line spans the newline boundaries around the anchor's start.
+  let start = text.slice(0, at).lastIndexOf('\n') + 1;
+  for (let i = 0; i < preceding && start > 0; i++) {
+    const newline = text.lastIndexOf('\n', start - 2);
+    const nextStart = newline + 1;
+    if (nextStart >= start) break;
+    start = nextStart;
+  }
+  let end = text.indexOf('\n', at);
+  if (end < 0) end = text.length;
+  for (let i = 0; i < following && end < text.length; i++) {
+    const newline = text.indexOf('\n', end + 1);
+    end = newline < 0 ? text.length : newline;
+  }
+  return text.slice(start, end);
+}
+
+function prefixFirstText(content: readonly ContentPart[], prefix: string): ContentPart[] {
+  const index = content.findIndex((part) => part.type === 'text');
+  if (index < 0) return [{ type: 'text', text: prefix.trimEnd() }, ...content];
+  return content.map((part, position) =>
+    position === index && part.type === 'text' ? { type: 'text', text: prefix + part.text } : part,
+  );
+}
+
+function messageText(message: ContextMessage): string {
+  return message.content.map((part) => (part.type === 'text' ? part.text : '')).join('');
+}

packages/agent-core-v2/src/agent/spine/tools/controlResult.ts

@@ -20,3 +20,30 @@ export function toControlResult(result: SpineTransitionResult): ExecutableToolRe
   if (result.accepted) return { isError: false, output: ACCEPTED_OUTPUT };
   return { isError: true, output: result.reason };
 }
+
+/**
+ * Receipt of an accepted `spine_trim` call. Unlike a transition receipt the
+ * trim takes effect immediately — the receipt landing in history IS the trim
+ * — and the trim derivation matches this text verbatim.
+ */
+export const TRIM_ACCEPTED_OUTPUT = 'trim accepted';
+
+export function toTrimResult(result: SpineTransitionResult): ExecutableToolResult {
+  if (result.accepted) return { isError: false, output: TRIM_ACCEPTED_OUTPUT };
+  return { isError: true, output: result.reason };
+}
+
+/**
+ * Maps the result of `IAgentSpineService.executeSpawn` to an executable tool
+ * result: accepted fissions return the structured JSON receipt verbatim so it
+ * can be matched by `deriveSpineState`; rejected fissions surface the reason as
+ * an error so the model can self-correct.
+ */
+export function toSpawnResult(
+  result: SpineTransitionResult & { readonly receipt?: string },
+): ExecutableToolResult {
+  if (result.accepted) {
+    return { isError: false, output: result.receipt ?? '' };
+  }
+  return { isError: true, output: result.reason };
+}

packages/agent-core-v2/src/agent/spine/tools/descriptions.ts

@@ -24,3 +24,39 @@ export const SPINE_NEXT_SUMMARY_DESCRIPTION =
 
 export const SPINE_NODE_MEMORY_DESCRIPTION =
   'Continuation memory for the node being closed. Optimize for compact recoverability: preserve the smallest sufficient state that lets future work continue correctly without replaying this node. Treat inherited context and assembled child memory as already available; write only compact deltas and current state needed for continuation. Include objective/status, decisions, artifacts/evidence, validation, constraints or risks, next action when work remains, and [U#] request status. Use precise paths, ids, commit hashes, and test names when they matter.';
+
+export const SPINE_TRIM_DESCRIPTION =
+  'Conservatively trim one tagged tool-result projection without changing the Spine tree or creating memory. A TRIM_ID is valid only for the immediately preceding tool-result batch and expires after the next assistant tool request; after a miss, do not retry it. Use slice to retain needed evidence, use snip only after useful facts are preserved, and otherwise leave the result unchanged.';
+
+export const SPINE_TRIM_ID_DESCRIPTION =
+  'Trim id attached to a tool response in the immediately previous tool-result batch; it expires after your next assistant tool request.';
+
+export const SPINE_TRIM_OP_DESCRIPTION =
+  'Use snip only when useful facts are preserved elsewhere; use slice to keep the needed head, tail, or anchor window.';
+
+export const SPINE_TRIM_HEAD_DESCRIPTION =
+  'For op="slice", keep this many characters from the start of the current visible body. Mutually exclusive with tail and anchor.';
+
+export const SPINE_TRIM_TAIL_DESCRIPTION =
+  'For op="slice", keep this many characters from the end of the current visible body. Mutually exclusive with head and anchor.';
+
+export const SPINE_TRIM_ANCHOR_DESCRIPTION =
+  'For op="slice", locate this non-empty text in the current visible body and keep an anchor window. Mutually exclusive with head and tail.';
+
+export const SPINE_TRIM_PRECEDING_DESCRIPTION =
+  'For anchor slice, keep this many complete lines before the anchor line.';
+
+export const SPINE_TRIM_FOLLOWING_DESCRIPTION =
+  'For anchor slice, keep this many complete lines after the anchor line.';
+
+export const SPINE_SPAWN_DESCRIPTION =
+  'Fission the current continuation into parallel, independent branches. Each branch runs in its own child agent with no supervisory model active; the original continuation is suspended until all branches complete. The branches complete their assignments in parallel, and the host atomically records their outcomes in input order as a structured receipt. Use only when the branches are genuinely independent and can proceed without coordination; do not use spine_spawn for work that requires cross-branch synchronization or a shared plan.';
+
+export const SPINE_SPAWN_TASKS_DESCRIPTION =
+  'Array of branch assignments. Must contain at least 2 entries and no more than the current capacity.';
+
+export const SPINE_SPAWN_SUMMARY_DESCRIPTION =
+  'Concise branch label, distinct within this spawn call, and its independently owned outcome.';
+
+export const SPINE_SPAWN_PROMPT_DESCRIPTION =
+  'Complete branch assignment, including the task, any constraints, and coordination conventions the branch should follow. The branch will be run in isolation with only this prompt and the inherited context.';

packages/agent-core-v2/src/agent/spine/tools/spine-spawn.ts

@@ -0,0 +1,78 @@
+/**
+ * `spine` domain (L4) — `spine_spawn` control tool.
+ *
+ * Receipt-only, but NOT a transition in the ordinary sense: the accepted
+ * structured receipt landing in history IS the join, from which the projection
+ * synthesizes N closed child nodes. The service owns capacity admission and
+ * per-step mutual exclusion with the other spine control tools. Self-registers
+ * via `registerTool` gated on BOTH the `KIMI_CODE_SPINE` and
+ * `KIMI_CODE_SPINE_SPAWN` flags and `agentId === 'main'` (main-agent-only,
+ * like the other spine tools), and only when the configured capacity admits at
+ * least two concurrent child agents. Bound at Agent scope.
+ */
+
+import { z } from 'zod';
+
+import { toInputJsonSchema } from '#/tool/input-schema';
+import type { BuiltinTool, ToolExecution } from '#/tool/toolContract';
+import { registerTool } from '#/agent/toolRegistry/toolContribution';
+
+import { IAgentScopeContext } from '#/agent/scopeContext/scopeContext';
+import { SPINE_FLAG_ID, SPINE_SPAWN_FLAG_ID } from '#/agent/spine/flag';
+import { IAgentSpineService, SPINE_TOOL_SPAWN } from '#/agent/spine/spine';
+import {
+  maxSpawnBranchCount,
+  resolveMaxThreads,
+  SPINE_SPAWN_MAX_THREADS_ENV,
+} from '#/agent/spine/spineSpawn';
+import { IFlagService } from '#/app/flag/flag';
+import { toSpawnResult } from './controlResult';
+import {
+  SPINE_SPAWN_DESCRIPTION,
+  SPINE_SPAWN_PROMPT_DESCRIPTION,
+  SPINE_SPAWN_SUMMARY_DESCRIPTION,
+  SPINE_SPAWN_TASKS_DESCRIPTION,
+} from './descriptions';
+
+const SpineSpawnInputSchema = z.object({
+  tasks: z
+    .array(
+      z.object({
+        summary: z.string().min(1).describe(SPINE_SPAWN_SUMMARY_DESCRIPTION),
+        prompt: z.string().min(1).describe(SPINE_SPAWN_PROMPT_DESCRIPTION),
+      }),
+    )
+    .min(2)
+    .describe(SPINE_SPAWN_TASKS_DESCRIPTION),
+});
+
+export type SpineSpawnInput = z.infer<typeof SpineSpawnInputSchema>;
+
+export class SpineSpawnTool implements BuiltinTool<SpineSpawnInput> {
+  readonly name = SPINE_TOOL_SPAWN;
+  readonly description = SPINE_SPAWN_DESCRIPTION;
+  readonly parameters: Record<string, unknown> = toInputJsonSchema(SpineSpawnInputSchema);
+
+  constructor(@IAgentSpineService private readonly spine: IAgentSpineService) {}
+
+  resolveExecution(input: SpineSpawnInput): ToolExecution {
+    return {
+      approvalRule: this.name,
+      description: 'Spawn parallel Spine branches',
+      execute: async (ctx) => toSpawnResult(await this.spine.executeSpawn(input.tasks, ctx.signal)),
+    };
+  }
+}
+
+function spawnCapacityAtLeastTwo(): boolean {
+  const maxThreads = resolveMaxThreads(process.env[SPINE_SPAWN_MAX_THREADS_ENV]);
+  return maxSpawnBranchCount(maxThreads) >= 2;
+}
+
+registerTool(SpineSpawnTool, {
+  when: (accessor) =>
+    accessor.get(IFlagService).enabled(SPINE_FLAG_ID) &&
+    accessor.get(IFlagService).enabled(SPINE_SPAWN_FLAG_ID) &&
+    accessor.get(IAgentScopeContext).agentId === 'main' &&
+    spawnCapacityAtLeastTwo(),
+});

packages/agent-core-v2/src/agent/spine/tools/spine-trim.ts

@@ -0,0 +1,79 @@
+/**
+ * `spine` domain (L4) — `spine_trim` tool.
+ *
+ * Receipt-only, but NOT a transition: no per-step budget and no pending
+ * registration — the host validates the call against the derived eligibility
+ * window (unknown / consumed / out-of-window / anchor-missing ids reject with
+ * a do-not-retry reason), and the accepted receipt landing in history IS the
+ * trim, re-derived by the projection on every read. A malformed slice shape
+ * (not exactly one of head / tail / anchor) rejects here with a retryable
+ * reason, before any receipt exists. Self-registers via `registerTool` gated
+ * on BOTH the `KIMI_CODE_SPINE` and `KIMI_CODE_SPINE_TRIM` flags and
+ * `agentId === 'main'` (main-agent-only, like the other spine tools). Bound
+ * at Agent scope.
+ */
+
+import { z } from 'zod';
+
+import { toInputJsonSchema } from '#/tool/input-schema';
+import type { BuiltinTool, ToolExecution } from '#/tool/toolContract';
+import { registerTool } from '#/agent/toolRegistry/toolContribution';
+
+import { IAgentScopeContext } from '#/agent/scopeContext/scopeContext';
+import { SPINE_FLAG_ID, SPINE_TRIM_FLAG_ID } from '#/agent/spine/flag';
+import { IAgentSpineService, SPINE_TOOL_TRIM } from '#/agent/spine/spine';
+import { normalizeTrimOp } from '#/agent/spine/spineTrimDerive';
+import { IFlagService } from '#/app/flag/flag';
+import { toTrimResult } from './controlResult';
+import {
+  SPINE_TRIM_ANCHOR_DESCRIPTION,
+  SPINE_TRIM_DESCRIPTION,
+  SPINE_TRIM_FOLLOWING_DESCRIPTION,
+  SPINE_TRIM_HEAD_DESCRIPTION,
+  SPINE_TRIM_ID_DESCRIPTION,
+  SPINE_TRIM_OP_DESCRIPTION,
+  SPINE_TRIM_PRECEDING_DESCRIPTION,
+  SPINE_TRIM_TAIL_DESCRIPTION,
+} from './descriptions';
+
+const SpineTrimInputSchema = z.object({
+  TRIM_ID: z.string().min(1).describe(SPINE_TRIM_ID_DESCRIPTION),
+  op: z.enum(['snip', 'slice']).describe(SPINE_TRIM_OP_DESCRIPTION),
+  head: z.number().int().positive().optional().describe(SPINE_TRIM_HEAD_DESCRIPTION),
+  tail: z.number().int().positive().optional().describe(SPINE_TRIM_TAIL_DESCRIPTION),
+  anchor: z.string().min(1).optional().describe(SPINE_TRIM_ANCHOR_DESCRIPTION),
+  preceding: z.number().int().nonnegative().optional().describe(SPINE_TRIM_PRECEDING_DESCRIPTION),
+  following: z.number().int().nonnegative().optional().describe(SPINE_TRIM_FOLLOWING_DESCRIPTION),
+});
+
+export type SpineTrimInput = z.infer<typeof SpineTrimInputSchema>;
+
+const REJECT_SLICE_SHAPE =
+  'op="slice" requires exactly one of head, tail, or anchor; correct the arguments and retry.';
+
+export class SpineTrimTool implements BuiltinTool<SpineTrimInput> {
+  readonly name = SPINE_TOOL_TRIM;
+  readonly description = SPINE_TRIM_DESCRIPTION;
+  readonly parameters: Record<string, unknown> = toInputJsonSchema(SpineTrimInputSchema);
+
+  constructor(@IAgentSpineService private readonly spine: IAgentSpineService) {}
+
+  resolveExecution(input: SpineTrimInput): ToolExecution {
+    return {
+      approvalRule: this.name,
+      description: 'Trim a tagged tool result',
+      execute: async () => {
+        const op = normalizeTrimOp(input.op, input);
+        if (op === undefined) return { isError: true, output: REJECT_SLICE_SHAPE };
+        return toTrimResult(this.spine.acceptTrim(input.TRIM_ID, op));
+      },
+    };
+  }
+}
+
+registerTool(SpineTrimTool, {
+  when: (accessor) =>
+    accessor.get(IFlagService).enabled(SPINE_FLAG_ID) &&
+    accessor.get(IFlagService).enabled(SPINE_TRIM_FLAG_ID) &&
+    accessor.get(IAgentScopeContext).agentId === 'main',
+});

packages/agent-core-v2/src/session/agentLifecycle/agentLifecycle.ts

@@ -44,6 +44,15 @@ export interface CreateAgentOptions {
 export interface ForkAgentOptions {
   readonly agentId?: string;
   readonly binding?: Partial<BindAgentInput>;
+  /**
+   * When true, trim the trailing assistant message that carries tool calls from
+   * the copied context history before appending it to the forked agent. This
+   * removes the in-flight tool-call carrier (e.g. `spine_spawn`) so the child
+   * agent does not inherit an unfinished parent action as part of its context.
+   * Only the last message is considered; if it has no tool calls it is left in
+   * place. Default behavior (undefined/false) copies the history verbatim.
+   */
+  readonly trimTrailingToolCallBatch?: boolean;
 }
 
 export interface AgentListFilter {

packages/agent-core-v2/src/session/agentLifecycle/agentLifecycleService.ts

@@ -54,6 +54,7 @@ import { IAgentToolSelectAnnouncementsService } from '#/agent/toolSelect/toolSel
 import { IAgentPermissionModeService } from '#/agent/permissionMode/permissionMode';
 import { IAgentPermissionGate } from '#/agent/permissionGate/permissionGate';
 import { IAgentContextMemoryService } from '#/agent/contextMemory/contextMemory';
+import type { ContextMessage } from '#/agent/contextMemory/types';
 import { IAgentContextInjectorService } from '#/agent/contextInjector/contextInjector';
 import { IAgentFullCompactionService } from '#/agent/fullCompaction/fullCompaction';
 import { IAgentGoalService } from '#/agent/goal/goal';
@@ -309,7 +310,11 @@ export class AgentLifecycleService extends Disposable implements IAgentLifecycle
 
     const sourceMessages = source.accessor.get(IAgentContextMemoryService)?.get();
     if (sourceMessages !== undefined && sourceMessages.length > 0) {
-      child.accessor.get(IAgentContextMemoryService)?.append(...sourceMessages);
+      const messagesToCopy =
+        opts?.trimTrailingToolCallBatch === true
+          ? trimTrailingToolCallBatch(sourceMessages)
+          : sourceMessages;
+      child.accessor.get(IAgentContextMemoryService)?.append(...messagesToCopy);
     }
     return child;
   }
@@ -353,6 +358,20 @@ export class AgentLifecycleService extends Disposable implements IAgentLifecycle
   }
 }
 
+/**
+ * Returns a shallow copy of `messages` with the last assistant message that
+ * carries tool calls removed, if such a message is the final message in the
+ * array. If the last message is not an assistant message or has no tool calls,
+ * the array is returned unchanged (the caller already has a fresh reference to
+ * the source messages, so a shallow copy is defensive enough).
+ */
+function trimTrailingToolCallBatch(messages: readonly ContextMessage[]): readonly ContextMessage[] {
+  const last = messages.at(-1);
+  if (last === undefined || last.role !== 'assistant') return messages;
+  if (last.toolCalls.length === 0) return messages;
+  return messages.slice(0, -1);
+}
+
 registerScopedService(
   LifecycleScope.Session,
   IAgentLifecycleService,

packages/agent-core-v2/src/session/agentLifecycle/profile/profiles.ts

@@ -55,16 +55,18 @@ const AGENT_TOOLS = [
   // agent's active-tool whitelist lets the spine tools through when the
   // `spine` experimental flag is enabled — the tools register only on the
   // main agent (see `registerTool(..., { when })` gating on
-  // `IFlagService.enabled(SPINE_FLAG_ID)` and `agentId === 'main'`), so for
-  // every other agent a name listed here contributes nothing, same as an
-  // unmatched `mcp__*` pattern. The `Agent` tool description filters these
-  // names out when rendering profile tool lists (see
-  // `session/subagent/tools/agent.ts`), so they never reach an LLM-facing
-  // schema as text either.
+  // `IFlagService.enabled(SPINE_FLAG_ID)` and `agentId === 'main'`; the trim
+  // tool additionally requires `SPINE_TRIM_FLAG_ID`), so for every other
+  // agent a name listed here contributes nothing, same as an unmatched
+  // `mcp__*` pattern. The `Agent` tool description filters these names out
+  // when rendering profile tool lists (see `session/subagent/tools/agent.ts`),
+  // so they never reach an LLM-facing schema as text either.
   'spine_open',
   'spine_close',
   'spine_next',
   'spine_tree',
+  'spine_trim',
+  'spine_spawn',
 ] as const;
 
 const CODER_TOOLS = [

packages/agent-core-v2/test/spine/fixtures/legacy-next.jsonl

@@ -0,0 +1,152 @@
+{"type":"metadata","protocol_version":"1.4","created_at":1783999150312}
+{"type":"mcp.tools_discovered","serverName":"server_1","hash":"hash_1","tools":[{"name":"tool_1","description":"text_1","inputSchema":{}},{"name":"tool_2","description":"text_2","inputSchema":{}}],"enabledNames":["tool_1","tool_2"],"time":1783999150312}
+{"type":"permission.set_mode","mode":"yolo","time":1783999150312}
+{"type":"config.update","profileName":"name_1","systemPrompt":"prompt_3","time":1783999150316}
+{"type":"tools.set_active_tools","names":["Read","Write","Edit","Grep","Glob","Bash","TaskList","TaskOutput","TaskStop","CronCreate","CronList","CronDelete","ReadMediaFile","TodoList","Skill","WebSearch","Agent","AgentSwarm","FetchURL","AskUserQuestion","EnterPlanMode","ExitPlanMode","CreateGoal","GetGoal","SetGoalBudget","UpdateGoal","mcp__*","spine_open","spine_close","spine_next","spine_tree"],"time":1783999150316}
+{"type":"config.update","modelAlias":"model_3","thinkingEffort":"max","time":1783999150316}
+{"type":"config.update","thinkingEffort":"max","time":1783999150316}
+{"type":"permission.set_mode","mode":"yolo","time":1783999150317}
+{"type":"permission.set_mode","mode":"yolo","time":1783999150330}
+{"type":"config.update","modelAlias":"model_4","thinkingEffort":"max","time":1783999160422}
+{"type":"config.update","thinkingEffort":"on","time":1783999160423}
+{"type":"turn.prompt","input":[{"type":"text","text":"text_77"}],"origin":{"kind":"user"},"time":1783999162407}
+{"type":"context.append_message","message":{"role":"user","content":[{"type":"text","text":"text_77"}],"toolCalls":[],"id":"msgid_5"},"time":1783999162407}
+{"type":"context.append_loop_event","event":{"type":"step.begin","uuid":"uuid_71","turnId":"0","step":1},"time":1783999162407}
+{"type":"llm.tools_snapshot","hash":"hash_4","tools":[{"name":"Agent","description":"text_4","parameters":{}},{"name":"AgentSwarm","description":"text_5","parameters":{}},{"name":"AskUserQuestion","description":"text_78","parameters":{}},{"name":"Bash","description":"text_79","parameters":{}},{"name":"CreateGoal","description":"text_8","parameters":{}},{"name":"CronCreate","description":"text_9","parameters":{}},{"name":"CronDelete","description":"text_10","parameters":{}},{"name":"CronList","description":"text_11","parameters":{}},{"name":"Edit","description":"text_12","parameters":{}},{"name":"EnterPlanMode","description":"text_13","parameters":{}},{"name":"ExitPlanMode","description":"text_14","parameters":{}},{"name":"FetchURL","description":"text_15","parameters":{}},{"name":"GetGoal","description":"text_16","parameters":{}},{"name":"Glob","description":"text_17","parameters":{}},{"name":"Grep","description":"text_18","parameters":{}},{"name":"mcp__plugin-kimi-datasource_data__call_data_source_tool","description":"text_1","parameters":{}},{"name":"mcp__plugin-kimi-datasource_data__get_data_source_desc","description":"text_2","parameters":{}},{"name":"Read","description":"text_19","parameters":{}},{"name":"ReadMediaFile","description":"text_80","parameters":{}},{"name":"SetGoalBudget","description":"text_21","parameters":{}},{"name":"Skill","description":"text_22","parameters":{}},{"name":"spine_close","description":"text_23","parameters":{}},{"name":"spine_next","description":"text_24","parameters":{}},{"name":"spine_open","description":"text_25","parameters":{}},{"name":"spine_tree","description":"text_26","parameters":{}},{"name":"TaskList","description":"text_27","parameters":{}},{"name":"TaskOutput","description":"text_81","parameters":{}},{"name":"TaskStop","description":"text_29","parameters":{}},{"name":"UpdateGoal","description":"text_30","parameters":{}},{"name":"WebSearch","description":"text_31","parameters":{}},{"name":"Write","description":"text_32","parameters":{}}],"time":1783999162408}
+{"type":"llm.request","kind":"loop","provider":"name_2","model":"model_5","modelAlias":"model_4","thinkingEffort":"on","thinkingKeep":"all","maxTokens":262044,"toolSelect":false,"systemPromptHash":"hash_5","systemPrompt":"prompt_4","toolsHash":"hash_4","messageCount":2,"turnStep":"0.1","time":1783999162409}
+{"type":"usage.record","model":"model_4","usage":{"inputOther":25761,"output":171,"inputCacheRead":512,"inputCacheCreation":0},"usageScope":"turn","time":1783999172043}
+{"type":"context.append_loop_event","event":{"type":"content.part","uuid":"uuid_72","turnId":"0","step":1,"stepUuid":"uuid_71","part":{"type":"think","think":"text_82"}},"time":1783999172044}
+{"type":"context.append_loop_event","event":{"type":"tool.call","uuid":"uuid_73","turnId":"0","step":1,"stepUuid":"uuid_71","toolCallId":"tool_kUFbxDvgvmx5Fdg0LzShRg3G","name":"spine_open","args":{"summary":"summary_4"}},"time":1783999172045}
+{"type":"context.append_loop_event","event":{"type":"tool.result","parentUuid":"uuid_73","toolCallId":"tool_kUFbxDvgvmx5Fdg0LzShRg3G","result":{"output":"accepted — commits after this step completes"}},"time":1783999172047}
+{"type":"context.append_loop_event","event":{"type":"step.end","uuid":"uuid_71","turnId":"0","step":1,"finishReason":"tool_use","usage":{"inputOther":25761,"output":171,"inputCacheRead":512,"inputCacheCreation":0},"llmFirstTokenLatencyMs":5853,"llmStreamDurationMs":3781,"llmRequestBuildMs":0,"llmServerFirstTokenMs":5853,"llmServerDecodeMs":3779,"llmClientConsumeMs":2,"messageId":"uuid_74","providerFinishReason":"tool_calls","rawFinishReason":"tool_calls"},"time":1783999172047}
+{"type":"spine.open","id":"1.1.1","summary":"summary_4","parentId":"1.1","openedAt":1,"baselineTokens":26457,"time":1783999172047}
+{"type":"context.append_loop_event","event":{"type":"step.begin","uuid":"uuid_75","turnId":"0","step":2},"time":1783999172047}
+{"type":"llm.request","kind":"loop","provider":"name_2","model":"model_5","modelAlias":"model_4","thinkingEffort":"on","thinkingKeep":"all","maxTokens":235684,"toolSelect":false,"systemPromptHash":"hash_5","systemPrompt":"prompt_4","toolsHash":"hash_4","messageCount":4,"turnStep":"0.2","time":1783999172048}
+{"type":"usage.record","model":"model_4","usage":{"inputOther":262,"output":110,"inputCacheRead":27204,"inputCacheCreation":0},"usageScope":"turn","time":1783999177303}
+{"type":"context.append_loop_event","event":{"type":"content.part","uuid":"uuid_76","turnId":"0","step":2,"stepUuid":"uuid_75","part":{"type":"think","think":"text_83"}},"time":1783999177303}
+{"type":"context.append_loop_event","event":{"type":"tool.call","uuid":"uuid_77","turnId":"0","step":2,"stepUuid":"uuid_75","toolCallId":"tool_wlJWxGoJl07piyztnjADuFL3","name":"Glob","args":{}},"time":1783999177306}
+{"type":"context.append_loop_event","event":{"type":"tool.call","uuid":"uuid_78","turnId":"0","step":2,"stepUuid":"uuid_75","toolCallId":"tool_hTby4xZX4FcDuD42O1eK02Tc","name":"Glob","args":{}},"time":1783999177307}
+{"type":"context.append_loop_event","event":{"type":"tool.call","uuid":"uuid_79","turnId":"0","step":2,"stepUuid":"uuid_75","toolCallId":"tool_lMqBgw2vQkwfM55riDBcHEqt","name":"Grep","args":{}},"time":1783999177307}
+{"type":"context.append_loop_event","event":{"type":"tool.result","parentUuid":"uuid_77","toolCallId":"tool_wlJWxGoJl07piyztnjADuFL3","result":{"output":"text_84"}},"time":1783999177519}
+{"type":"context.append_loop_event","event":{"type":"tool.result","parentUuid":"uuid_78","toolCallId":"tool_hTby4xZX4FcDuD42O1eK02Tc","result":{"output":"text_84"}},"time":1783999177520}
+{"type":"context.append_loop_event","event":{"type":"tool.result","parentUuid":"uuid_79","toolCallId":"tool_lMqBgw2vQkwfM55riDBcHEqt","result":{"output":"text_85"}},"time":1783999177649}
+{"type":"context.append_loop_event","event":{"type":"step.end","uuid":"uuid_75","turnId":"0","step":2,"finishReason":"tool_use","usage":{"inputOther":262,"output":110,"inputCacheRead":27204,"inputCacheCreation":0},"llmFirstTokenLatencyMs":2799,"llmStreamDurationMs":2455,"llmRequestBuildMs":0,"llmServerFirstTokenMs":2799,"llmServerDecodeMs":2454,"llmClientConsumeMs":1,"messageId":"uuid_80","providerFinishReason":"tool_calls","rawFinishReason":"tool_calls"},"time":1783999177650}
+{"type":"context.append_loop_event","event":{"type":"step.begin","uuid":"uuid_81","turnId":"0","step":3},"time":1783999177650}
+{"type":"llm.request","kind":"loop","provider":"name_2","model":"model_5","modelAlias":"model_4","thinkingEffort":"on","thinkingKeep":"all","maxTokens":234289,"toolSelect":false,"systemPromptHash":"hash_5","systemPrompt":"prompt_4","toolsHash":"hash_4","messageCount":8,"turnStep":"0.3","time":1783999177653}
+{"type":"usage.record","model":"model_4","usage":{"inputOther":451,"output":96,"inputCacheRead":27399,"inputCacheCreation":0},"usageScope":"turn","time":1783999181793}
+{"type":"context.append_loop_event","event":{"type":"content.part","uuid":"uuid_82","turnId":"0","step":3,"stepUuid":"uuid_81","part":{"type":"think","think":"text_86"}},"time":1783999181794}
+{"type":"context.append_loop_event","event":{"type":"tool.call","uuid":"uuid_83","turnId":"0","step":3,"stepUuid":"uuid_81","toolCallId":"tool_yl2Tw1GX0PTBTsjbM3K2hJK4","name":"Read","args":{}},"time":1783999181796}
+{"type":"context.append_loop_event","event":{"type":"tool.result","parentUuid":"uuid_83","toolCallId":"tool_yl2Tw1GX0PTBTsjbM3K2hJK4","result":{"output":"text_87","note":"text_88"}},"time":1783999181799}
+{"type":"context.append_loop_event","event":{"type":"step.end","uuid":"uuid_81","turnId":"0","step":3,"finishReason":"tool_use","usage":{"inputOther":451,"output":96,"inputCacheRead":27399,"inputCacheCreation":0},"llmFirstTokenLatencyMs":2030,"llmStreamDurationMs":2109,"llmRequestBuildMs":1,"llmServerFirstTokenMs":2029,"llmServerDecodeMs":2108,"llmClientConsumeMs":1,"messageId":"uuid_84","providerFinishReason":"tool_calls","rawFinishReason":"tool_calls"},"time":1783999181800}
+{"type":"context.append_loop_event","event":{"type":"step.begin","uuid":"uuid_85","turnId":"0","step":4},"time":1783999181800}
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packages/agent-core-v2/test/spine/fixtures/legacy-open-close.jsonl

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packages/agent-core-v2/test/spine/fixtures/legacy-receipt-anchor.jsonl

@@ -0,0 +1,628 @@
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+{"type":"context.append_loop_event","event":{"type":"content.part","uuid":"uuid_1550","turnId":"1","step":4,"stepUuid":"uuid_1549","part":{"type":"think","think":"text_1118"}},"time":1783670253437}
+{"type":"context.append_loop_event","event":{"type":"content.part","uuid":"uuid_1551","turnId":"1","step":4,"stepUuid":"uuid_1549","part":{"type":"text","text":"text_1119"}},"time":1783670253437}
+{"type":"context.append_loop_event","event":{"type":"step.end","uuid":"uuid_1549","turnId":"1","step":4,"finishReason":"end_turn","usage":{"inputOther":1945,"output":699,"inputCacheRead":29696,"inputCacheCreation":0},"llmFirstTokenLatencyMs":1733,"llmStreamDurationMs":13227,"llmRequestBuildMs":1,"llmServerFirstTokenMs":1732,"llmServerDecodeMs":13214,"llmClientConsumeMs":13,"messageId":"uuid_1552"},"time":1783670253437}
+{"type":"usage.record","model":"model_9","usage":{"inputOther":1945,"output":699,"inputCacheRead":29696,"inputCacheCreation":0},"usageScope":"turn","time":1783670253437}

packages/agent-core-v2/test/spine/fold.test.ts

@@ -8,6 +8,10 @@ import type { ContextMessage } from '#/agent/contextMemory/types';
 import { MASTER_ENV } from '#/app/flag/flagService';
 import {
   ACCEPTED_OUTPUT,
+  normalizeTrimOp,
+  SPINE_TRIM_SNIPPED_PLACEHOLDER,
+  SPINE_TRIM_THRESHOLD_BYTES,
+  TRIM_ACCEPTED_OUTPUT,
   WIRE_PROTOCOL_VERSION,
   appendSpineView,
   deriveSpineState,
@@ -886,6 +890,283 @@ describe('Spine derivation from the message stream', () => {
   });
 });
 
+describe('Spine spawn projection', () => {
+  beforeEach(() => {
+    vi.stubEnv(MASTER_ENV, '0');
+    vi.stubEnv(SPINE_ENV, '1');
+  });
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('synthesizes N closed siblings from a valid spine_spawn receipt', () => {
+    const state = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', [
+        { summary: 'task A', prompt: 'do A' },
+        { summary: 'task B', prompt: 'do B' },
+      ]),
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'memory A'),
+        spawnResult(1, 'completed', 'memory B'),
+      ]),
+    ]);
+
+    expect(state.openStack).toEqual(['1', '1.1']);
+    expect(state.nodes['1.1']?.children).toEqual(['1.1.1', '1.1.2']);
+    const a = state.nodes['1.1.1'];
+    const b = state.nodes['1.1.2'];
+    expect(a).toMatchObject({
+      summary: 'task A',
+      openedAt: 2,
+      closedAt: 2,
+      memory: 'memory A',
+    });
+    expect(b).toMatchObject({
+      summary: 'task B',
+      openedAt: 2,
+      closedAt: 2,
+      memory: 'memory B',
+    });
+    expect(a?.spawn).toEqual({ summary: 'task A', outcome: 'completed' });
+    expect(b?.spawn).toEqual({ summary: 'task B', outcome: 'completed' });
+  });
+
+  it('orders spawned nodes by input ordinal, not receipt order', () => {
+    const state = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', [
+        { summary: 'A', prompt: 'a' },
+        { summary: 'B', prompt: 'b' },
+        { summary: 'C', prompt: 'c' },
+      ]),
+      spawnReceipt('s1', [
+        spawnResult(2, 'completed', 'mem C'),
+        spawnResult(0, 'completed', 'mem A'),
+        spawnResult(1, 'completed', 'mem B'),
+      ]),
+    ]);
+
+    expect(state.nodes['1.1']?.children).toEqual(['1.1.1', '1.1.2', '1.1.3']);
+    expect(state.nodes['1.1.1']?.summary).toBe('A');
+    expect(state.nodes['1.1.2']?.summary).toBe('B');
+    expect(state.nodes['1.1.3']?.summary).toBe('C');
+    expect(state.nodes['1.1.1']?.memory).toBe('mem A');
+    expect(state.nodes['1.1.2']?.memory).toBe('mem B');
+    expect(state.nodes['1.1.3']?.memory).toBe('mem C');
+  });
+
+  it('records errored/aborted outcomes and diagnostics on spawned nodes', () => {
+    const state = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', [
+        { summary: 'ok', prompt: 'x' },
+        { summary: 'bad', prompt: 'y' },
+      ]),
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'done'),
+        spawnResult(1, 'errored', 'failed', 'disk full'),
+      ]),
+    ]);
+
+    expect(state.nodes['1.1']?.children).toEqual(['1.1.1', '1.1.2']);
+    expect(state.nodes['1.1.1']?.spawn).toEqual({ summary: 'ok', outcome: 'completed' });
+    expect(state.nodes['1.1.2']?.spawn).toEqual({
+      summary: 'bad',
+      outcome: 'errored',
+      diagnostic: 'disk full',
+    });
+  });
+
+  it('rejects malformed spawn receipts all-or-nothing', () => {
+    const tasks = [
+      { summary: 'A', prompt: 'a' },
+      { summary: 'B', prompt: 'b' },
+    ];
+
+    const badSchema = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', tasks),
+      rawSpawnReceipt('s1', {
+        schema: 'spine.spawn.result.v0',
+        results: [spawnResult(0, 'completed', 'a'), spawnResult(1, 'completed', 'b')],
+      }),
+    ]);
+    expect(badSchema.nodes['1.1']?.children).toEqual([]);
+
+    const gapOrdinal = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', tasks),
+      spawnReceipt('s1', [spawnResult(0, 'completed', 'a')]),
+    ]);
+    expect(gapOrdinal.nodes['1.1']?.children).toEqual([]);
+
+    const emptyMemory = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', tasks),
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'a'),
+        spawnResult(1, 'completed', ''),
+      ]),
+    ]);
+    expect(emptyMemory.nodes['1.1']?.children).toEqual([]);
+
+    const mismatchCount = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', tasks),
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'a'),
+        spawnResult(1, 'completed', 'b'),
+        spawnResult(2, 'completed', 'c'),
+      ]),
+    ]);
+    expect(mismatchCount.nodes['1.1']?.children).toEqual([]);
+
+    const missingDiagnostic = deriveSpineState([
+      userMessage('start'),
+      spawnCall('s1', tasks),
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'a'),
+        spawnResult(1, 'errored', 'b'),
+      ]),
+    ]);
+    expect(missingDiagnostic.nodes['1.1']?.children).toEqual([]);
+  });
+
+  it('keeps child indices contiguous when spawn is mixed with open/close/next', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('o1', 'spine_open', JSON.stringify({ summary: 'task A' })));
+    append(ctx, spineAcceptedReceipt('o1'));
+    append(ctx, assistantToolCall('c1', 'spine_close', JSON.stringify({ memory: 'did A' })));
+    append(ctx, spineAcceptedReceipt('c1'));
+    append(
+      ctx,
+      spawnCall('s1', [
+        { summary: 'spawn 1', prompt: 'p1' },
+        { summary: 'spawn 2', prompt: 'p2' },
+      ]),
+    );
+    append(
+      ctx,
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'mem 1'),
+        spawnResult(1, 'completed', 'mem 2'),
+      ]),
+    );
+    append(ctx, assistantToolCall('o2', 'spine_open', JSON.stringify({ summary: 'task B' })));
+    append(ctx, spineAcceptedReceipt('o2'));
+
+    const state = deriveSpineState(ctx.context.get());
+    expect(state.nodes['1.1']?.children).toEqual(['1.1.1', '1.1.2', '1.1.3', '1.1.4']);
+    expect(state.nodes['1.1.1']?.summary).toBe('task A');
+    expect(state.nodes['1.1.2']?.summary).toBe('spawn 1');
+    expect(state.nodes['1.1.3']?.summary).toBe('spawn 2');
+    expect(state.nodes['1.1.4']?.summary).toBe('task B');
+  });
+
+  it('renders spawn evidence followed by memory and keeps the carrier visible', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(
+      ctx,
+      spawnCall('s1', [
+        { summary: 'task A', prompt: 'p1' },
+        { summary: 'task B', prompt: 'p2' },
+      ]),
+    );
+    append(
+      ctx,
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'mem A'),
+        spawnResult(1, 'errored', 'mem B', 'disk full'),
+      ]),
+    );
+    append(ctx, userMessage('after'));
+
+    const folded = fold(ctx);
+    const texts = folded.map(textOf);
+    expect(texts).toContain('<spine_node id="1.1" summary="startup" status="live" />');
+    expect(texts).toContain('[U1] start');
+    expect(texts).toContain('calling spine_spawn');
+    expect(texts).not.toContain('spine.spawn.result.v1');
+    expect(texts).toContain('[U2] after');
+
+    const evidenceA = texts.find((t) => t.includes('<spine_spawn_evidence node_id="1.1.1"'));
+    const evidenceB = texts.find((t) => t.includes('<spine_spawn_evidence node_id="1.1.2"'));
+    expect(evidenceA).toBe(
+      '<spine_spawn_evidence node_id="1.1.1" summary="task A" outcome="completed" />',
+    );
+    expect(evidenceB).toBe(
+      '<spine_spawn_evidence node_id="1.1.2" summary="task B" outcome="errored" diagnostic="disk full" />',
+    );
+
+    const memoryA = texts.find((t) => t.includes('<spine_memory node_id="1.1.1"'));
+    const memoryB = texts.find((t) => t.includes('<spine_memory node_id="1.1.2"'));
+    expect(memoryA).toBe('<spine_memory node_id="1.1.1">\nmem A\n</spine_memory>');
+    expect(memoryB).toBe('<spine_memory node_id="1.1.2">\nmem B\n</spine_memory>');
+  });
+
+  it('spawns nodes under the current cursor, including nested open nodes', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('o1', 'spine_open', JSON.stringify({ summary: 'parent' })));
+    append(ctx, spineAcceptedReceipt('o1'));
+    append(
+      ctx,
+      spawnCall('s1', [
+        { summary: 'child A', prompt: 'a' },
+        { summary: 'child B', prompt: 'b' },
+      ]),
+    );
+    append(
+      ctx,
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'mem A'),
+        spawnResult(1, 'completed', 'mem B'),
+      ]),
+    );
+
+    const state = deriveSpineState(ctx.context.get());
+    expect(state.openStack).toEqual(['1', '1.1', '1.1.1']);
+    expect(state.nodes['1.1.1']?.children).toEqual(['1.1.1.1', '1.1.1.2']);
+    expect(state.nodes['1.1.1.1']?.summary).toBe('child A');
+    expect(state.nodes['1.1.1.2']?.summary).toBe('child B');
+  });
+
+  it('spawns nodes under the root epoch when the startup node is closed', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(
+      ctx,
+      assistantToolCall('c1', 'spine_close', JSON.stringify({ memory: 'startup done' })),
+    );
+    append(ctx, spineAcceptedReceipt('c1'));
+    append(
+      ctx,
+      spawnCall('s1', [
+        { summary: 'branch A', prompt: 'a' },
+        { summary: 'branch B', prompt: 'b' },
+      ]),
+    );
+    append(
+      ctx,
+      spawnReceipt('s1', [
+        spawnResult(0, 'completed', 'mem A'),
+        spawnResult(1, 'completed', 'mem B'),
+      ]),
+    );
+
+    const state = deriveSpineState(ctx.context.get());
+    expect(state.openStack).toEqual(['1']);
+    expect(state.nodes['1']?.children).toEqual(['1.1', '1.2', '1.3']);
+    expect(state.nodes['1.2']?.summary).toBe('branch A');
+    expect(state.nodes['1.3']?.summary).toBe('branch B');
+    expect(state.nodes['1.2']?.closedAt).toBe(4);
+    expect(state.nodes['1.3']?.closedAt).toBe(4);
+  });
+});
+
 describe('Spine legacy-op restore compat', () => {
   beforeEach(() => {
     vi.stubEnv(MASTER_ENV, '0');
@@ -1099,6 +1380,49 @@ function spineRejectedReceipt(toolCallId: string): ContextMessage {
   };
 }
 
+function spawnCall(
+  id: string,
+  tasks: readonly { summary: string; prompt: string }[],
+): ContextMessage {
+  return assistantToolCall(id, 'spine_spawn', JSON.stringify({ tasks }));
+}
+
+type SpawnOutcome = 'completed' | 'errored' | 'aborted';
+
+interface SpawnResultInput {
+  readonly ordinal: number;
+  readonly outcome: SpawnOutcome;
+  readonly memory_body: string;
+  readonly diagnostic?: string;
+}
+
+function spawnReceipt(toolCallId: string, results: readonly SpawnResultInput[]): ContextMessage {
+  return rawSpawnReceipt(toolCallId, { schema: 'spine.spawn.result.v1', results });
+}
+
+function rawSpawnReceipt(
+  toolCallId: string,
+  payload: Record<string, unknown>,
+): ContextMessage {
+  return {
+    role: 'tool',
+    content: [{ type: 'text', text: JSON.stringify(payload) }],
+    toolCalls: [],
+    toolCallId,
+  };
+}
+
+function spawnResult(
+  ordinal: number,
+  outcome: SpawnOutcome,
+  memory_body: string,
+  diagnostic?: string,
+): SpawnResultInput {
+  return diagnostic === undefined
+    ? { ordinal, outcome, memory_body }
+    : { ordinal, outcome, memory_body, diagnostic };
+}
+
 /**
  * Open A → close A → open B → next C, then a rejected open and a rejected
  * close: the derivation must apply exactly the accepted chain (1.1.1 closed,
@@ -1312,3 +1636,300 @@ function normalizeTokenGauges(text: string): string {
     '$1="~N"',
   );
 }
+
+describe('Spine trim projection', () => {
+  const TRIM_ENV = 'KIMI_CODE_SPINE_TRIM';
+
+  beforeEach(() => {
+    vi.stubEnv(MASTER_ENV, '0');
+    vi.stubEnv(SPINE_ENV, '1');
+    vi.stubEnv(TRIM_ENV, '1');
+  });
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('tags an oversized tool result with a byte-stable TRIM_ID prefix', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', oversized('BIG-BODY')));
+    append(ctx, assistantToolCall('c_small', 'Read'));
+    append(ctx, toolResult('c_small'));
+    append(ctx, assistantText('done'));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_big'))).toBe(
+      `[TRIM_ID: trim_1]\n${oversized('BIG-BODY')}`,
+    );
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_small'))).not.toContain('TRIM_ID');
+    // The stored history is never rewritten.
+    expect(textOf(ctx.context.get().find((m) => m.toolCallId === 'c_big'))).toBe(
+      oversized('BIG-BODY'),
+    );
+  });
+
+  it('numbers tags in stream order across batches', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_a', 'Bash'));
+    append(ctx, bigToolResult('c_a', oversized('A')));
+    append(ctx, assistantToolCall('c_b', 'Bash'));
+    append(ctx, bigToolResult('c_b', oversized('B')));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_a'))).toContain('[TRIM_ID: trim_1]');
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_b'))).toContain('[TRIM_ID: trim_2]');
+  });
+
+  it('renders a snipped result as the cleared placeholder and drops the label', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', oversized('BIG-BODY')));
+    append(ctx, trimCall('t1', { TRIM_ID: 'trim_1', op: 'snip' }));
+    append(ctx, trimAcceptedReceipt('t1'));
+    append(ctx, assistantText('done'));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_big'))).toBe(
+      SPINE_TRIM_SNIPPED_PLACEHOLDER,
+    );
+    // The trim receipt itself is a control result and stays untagged.
+    expect(textOf(folded.find((m) => m.toolCallId === 't1'))).toBe(TRIM_ACCEPTED_OUTPUT);
+  });
+
+  it('renders head and tail slices by characters', () => {
+    const ctx = testAgent();
+    const body = `BEGIN-${'x'.repeat(SPINE_TRIM_THRESHOLD_BYTES)}-END`;
+    append(ctx, userMessage('start'));
+    append(
+      ctx,
+      assistantBatchToolCalls([
+        { id: 'c_head', name: 'Bash' },
+        { id: 'c_tail', name: 'Bash' },
+      ]),
+    );
+    append(ctx, bigToolResult('c_head', body));
+    append(ctx, bigToolResult('c_tail', body));
+    append(
+      ctx,
+      assistantBatchToolCalls([
+        {
+          id: 't_head',
+          name: 'spine_trim',
+          args: JSON.stringify({ TRIM_ID: 'trim_1', op: 'slice', head: 6 }),
+        },
+        {
+          id: 't_tail',
+          name: 'spine_trim',
+          args: JSON.stringify({ TRIM_ID: 'trim_2', op: 'slice', tail: 4 }),
+        },
+      ]),
+    );
+    append(ctx, trimAcceptedReceipt('t_head'));
+    append(ctx, trimAcceptedReceipt('t_tail'));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_head'))).toBe('BEGIN-');
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_tail'))).toBe('-END');
+  });
+
+  it('renders an anchor slice as complete lines around the anchor line', () => {
+    const ctx = testAgent();
+    const noise = 'n'.repeat(SPINE_TRIM_THRESHOLD_BYTES);
+    const body = `${noise}\nFAILED test X\nstack line\ntrailing noise`;
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', body));
+    append(
+      ctx,
+      trimCall('t1', { TRIM_ID: 'trim_1', op: 'slice', anchor: 'FAILED test X', following: 1 }),
+    );
+    append(ctx, trimAcceptedReceipt('t1'));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_big'))).toBe(
+      'FAILED test X\nstack line',
+    );
+  });
+
+  it('never tags spine control receipts or media results', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_tree', 'spine_tree'));
+    append(ctx, bigToolResult('c_tree', oversized('TREE')));
+    append(ctx, assistantToolCall('c_img', 'Read'));
+    append(ctx, mediaToolResult('c_img', oversized('IMG')));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_tree'))).not.toContain('TRIM_ID');
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_img'))).not.toContain('TRIM_ID');
+  });
+
+  it('leaves the result tagged and whole when the trim receipt is an error', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', oversized('BIG-BODY')));
+    append(ctx, trimCall('t1', { TRIM_ID: 'trim_1', op: 'snip' }));
+    append(ctx, trimRejectedReceipt('t1'));
+
+    const folded = fold(ctx);
+    expect(textOf(folded.find((m) => m.toolCallId === 'c_big'))).toBe(
+      `[TRIM_ID: trim_1]\n${oversized('BIG-BODY')}`,
+    );
+  });
+
+  it('accepts a trim inside the window and rejects a repeat (one-shot)', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', oversized('BIG-BODY')));
+
+    const spine = ctx.get(IAgentSpineService);
+    expect(spine.acceptTrim('trim_1', { kind: 'snip' })).toEqual({ accepted: true });
+
+    append(ctx, trimCall('t1', { TRIM_ID: 'trim_1', op: 'snip' }));
+    append(ctx, trimAcceptedReceipt('t1'));
+
+    const repeat = spine.acceptTrim('trim_1', { kind: 'snip' });
+    expect(repeat.accepted).toBe(false);
+    if (repeat.accepted) return;
+    expect(repeat.reason).toContain('already trimmed');
+    expect(repeat.reason).toContain('Do not retry');
+  });
+
+  it('expires ids once a newer batch completes, but not on interleaved assistant text', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_a', 'Bash'));
+    append(ctx, bigToolResult('c_a', oversized('A')));
+    append(ctx, assistantText('thinking out loud'));
+
+    const spine = ctx.get(IAgentSpineService);
+    // Interleaved assistant text does not expire the window — and the accept
+    // itself records nothing (receipt-only, no side effect).
+    expect(spine.acceptTrim('trim_1', { kind: 'snip' })).toEqual({ accepted: true });
+
+    append(ctx, assistantToolCall('c_b', 'Bash'));
+    append(ctx, bigToolResult('c_b', oversized('B')));
+
+    const expired = spine.acceptTrim('trim_1', { kind: 'snip' });
+    expect(expired.accepted).toBe(false);
+    if (expired.accepted) return;
+    expect(expired.reason).toContain('immediately preceding');
+    expect(expired.reason).toContain('Do not retry');
+  });
+
+  it('rejects unknown ids and missing anchors with do-not-retry reasons', () => {
+    const ctx = testAgent();
+    append(ctx, userMessage('start'));
+    append(ctx, assistantToolCall('c_big', 'Bash'));
+    append(ctx, bigToolResult('c_big', oversized('body with a NEEDLE inside')));
+
+    const spine = ctx.get(IAgentSpineService);
+    const unknown = spine.acceptTrim('trim_99', { kind: 'snip' });
+    expect(unknown.accepted).toBe(false);
+    if (unknown.accepted) return;
+    expect(unknown.reason).toContain('Unknown TRIM_ID');
+    expect(unknown.reason).toContain('Do not retry');
+
+    const missing = spine.acceptTrim('trim_1', {
+      kind: 'slice',
+      shape: { type: 'anchor', anchor: 'NO_SUCH_TEXT', preceding: 0, following: 0 },
+    });
+    expect(missing.accepted).toBe(false);
+    if (missing.accepted) return;
+    expect(missing.reason).toContain('Anchor text not found');
+    expect(missing.reason).toContain('Do not retry');
+
+    expect(
+      spine.acceptTrim('trim_1', {
+        kind: 'slice',
+        shape: { type: 'anchor', anchor: 'NEEDLE', preceding: 0, following: 0 },
+      }),
+    ).toEqual({ accepted: true });
+  });
+
+  it('normalizes flat trim arguments into ops', () => {
+    expect(normalizeTrimOp('snip', {})).toEqual({ kind: 'snip' });
+    expect(normalizeTrimOp('slice', { head: 5 })).toEqual({
+      kind: 'slice',
+      shape: { type: 'head', chars: 5 },
+    });
+    expect(normalizeTrimOp('slice', { tail: 5 })).toEqual({
+      kind: 'slice',
+      shape: { type: 'tail', chars: 5 },
+    });
+    expect(normalizeTrimOp('slice', { anchor: 'a', preceding: 1 })).toEqual({
+      kind: 'slice',
+      shape: { type: 'anchor', anchor: 'a', preceding: 1, following: 0 },
+    });
+    expect(normalizeTrimOp('slice', {})).toBeUndefined();
+    expect(normalizeTrimOp('slice', { head: 5, tail: 5 })).toBeUndefined();
+  });
+});
+
+function bigToolResult(toolCallId: string, text: string): ContextMessage {
+  return {
+    role: 'tool',
+    content: [{ type: 'text', text }],
+    toolCalls: [],
+    toolCallId,
+  };
+}
+
+function mediaToolResult(toolCallId: string, text: string): ContextMessage {
+  return {
+    role: 'tool',
+    content: [
+      { type: 'image_url', imageUrl: { url: 'https://example.com/pixel.png' } },
+      { type: 'text', text },
+    ],
+    toolCalls: [],
+    toolCallId,
+  };
+}
+
+function assistantBatchToolCalls(
+  calls: readonly { id: string; name: string; args?: string }[],
+): ContextMessage {
+  return {
+    role: 'assistant',
+    content: [{ type: 'text', text: 'batch' }],
+    toolCalls: calls.map((call) => ({
+      type: 'function' as const,
+      id: call.id,
+      name: call.name,
+      arguments: call.args ?? '{}',
+    })),
+  };
+}
+
+function trimCall(id: string, args: Record<string, unknown>): ContextMessage {
+  return assistantToolCall(id, 'spine_trim', JSON.stringify(args));
+}
+
+function trimAcceptedReceipt(toolCallId: string): ContextMessage {
+  return {
+    role: 'tool',
+    content: [{ type: 'text', text: TRIM_ACCEPTED_OUTPUT }],
+    toolCalls: [],
+    toolCallId,
+  };
+}
+
+function trimRejectedReceipt(toolCallId: string): ContextMessage {
+  return {
+    role: 'tool',
+    content: [{ type: 'text', text: 'rejected: do not retry' }],
+    toolCalls: [],
+    toolCallId,
+    isError: true,
+  };
+}
+
+function oversized(body: string): string {
+  return body + 'x'.repeat(SPINE_TRIM_THRESHOLD_BYTES);
+}

packages/agent-core-v2/test/spine/legacyReplay.test.ts

@@ -0,0 +1,442 @@
+/**
+ * `spine` domain (L4) — P3.5 regression net: replay REAL pre-rewrite session
+ * wire logs and diff the op-replayed `SpineModel` state against the pure
+ * derivation (`deriveSpineState` over the restored `contextMemory` stream).
+ *
+ * Fixtures (`./fixtures/*.jsonl`) are sanitized real v2 wire logs from local
+ * pre-derivation sessions (2026-07-31 sanitization, one-off script kept out of
+ * tree): record count/order untouched, spine op payloads and message-side
+ * spine_* args mapped through one global dictionary to deterministic
+ * placeholders (so op-side == message-side exactly when the raw strings were
+ * equal), accepted receipts kept verbatim, all other free text placeholdered,
+ * blobref media neutralized to inline text parts. Sources:
+ *   - legacy-open-close.jsonl   0feff1ef (2026-07-14 build, open/close chain)
+ *   - legacy-next.jsonl         2fddef08 (2026-07-14 build, spine.next ×2, ends mid-session)
+ *   - legacy-receipt-anchor.jsonl 01KX07W6 (2026-07-08 build, pre f0c56f31b)
+ *   - legacy-undo-divergence.jsonl 2f793f68 (2026-07-16 build, undo ×7 +
+ *     truncate_repair ×4 + spine.next; tail cut right after the last
+ *     truncate_repair — a prefix cut never shifts message indices)
+ *   - legacy-root-compact.jsonl mremv61a (2026-07-10 build, spine.root_compact
+ *     ×1 → 2 root epochs). The only other real root_compact sample found
+ *     (mre987c4, 5 epochs) was rejected: 34 MB and a pre-fix build. Further
+ *     synthetic root_compact coverage lives in `compaction.test.ts`.
+ *
+ * ASSERTION GROUPS — the op-replay world and the derivation agree on real
+ * logs only up to three documented historical semantic differences (verified
+ * 2026-07-31 against 12 real sessions, none are derivation defects):
+ *
+ *  1. Span anchors (f0c56f31b, 2026-07-13). The legacy commit path persisted
+ *     close/next span ends at the transition's RECEIPT index (and some builds
+ *     anchored opens at carrier+1); f0c56f31b moved close/next to carrier−1
+ *     so the carrier and its receipt stay visible in the parent context.
+ *     Sessions written by older builds replay with the old anchors — the
+ *     receipt-anchor group pins the exact relation instead of equality.
+ *  2. Stored memory form (P5, plan/spine-v3-alignment.md). The legacy commit
+ *     path persisted `assembleMemoryBody()` output (## User Message / ##
+ *     Child Memory sections), and f0c56f31b's interrupted-transition commit
+ *     could persist a pending body whose accepted receipt never landed. The
+ *     derivation keeps the model-written close/next body verbatim (the fold
+ *     re-materializes user requests and child slots at read time). Where a
+ *     fixture exhibits this, the differing memory values are pinned exactly.
+ *  3. Witness-removing undos (the derivation's documented contract: "a
+ *     transition the stream does not fully witness is not a transition").
+ *     The op world kept frozen nodes for unwitnessed transitions
+ *     (truncate_repair voids/restarts spans); the derivation drops them and
+ *     re-derives ids/parents from the surviving stream. The undo-divergence
+ *     group pins both topologies and their documented relationship exactly.
+ *
+ * TOLERATED DRIFT (only): `baselineTokens` / `finalTokens` are not in the
+ * message stream and `archivePath` is deterministically re-derived, so the
+ * derivation never carries them; the exact-match group asserts they are
+ * absent on the derived side while present in the replayed legacy ops.
+ *
+ * Every fixture additionally asserts: restore reports ZERO unknown/malformed
+ * record skips (the "legacy op definitions stay registered" acceptance), all
+ * span indices stay inside the restored message bounds, and the open stack is
+ * self-consistent (ids exist, are open, and chain through `children`).
+ */
+
+import { readFileSync } from 'node:fs';
+
+import { describe, expect, it } from 'vitest';
+
+import {
+  resetUnexpectedErrorHandler,
+  setUnexpectedErrorHandler,
+} from '#/_base/errors/unexpectedError';
+import type { ContextMessage } from '#/agent/contextMemory/types';
+import { SPINE_TOOL_CLOSE } from '#/agent/spine/spine';
+import type { SpineState } from '#/agent/spine/spineOps';
+import type { WireRecord } from '#/wire/record';
+import {
+  deriveSpineState,
+  IAgentContextMemoryService,
+  IWireService,
+  SpineModel,
+  SPINE_VOID_OPENED_AT,
+} from '#/index';
+
+import {
+  InMemoryWireRecordPersistence,
+  testAgent,
+  wireRecordPersistenceServices,
+} from '../harness';
+
+interface RestoredFixture {
+  readonly replayed: SpineState;
+  readonly derived: SpineState;
+  readonly messages: readonly ContextMessage[];
+  readonly unexpected: readonly unknown[];
+}
+
+function loadFixtureRecords(name: string): WireRecord[] {
+  const path = new URL(`./fixtures/${name}.jsonl`, import.meta.url);
+  const records: WireRecord[] = [];
+  for (const line of readFileSync(path, 'utf8').split('\n')) {
+    if (line.trim().length === 0) continue;
+    records.push(JSON.parse(line) as WireRecord);
+  }
+  return records;
+}
+
+async function restoreFixture(name: string): Promise<RestoredFixture> {
+  const unexpected: unknown[] = [];
+  setUnexpectedErrorHandler((err) => unexpected.push(err));
+  try {
+    const ctx = testAgent(
+      wireRecordPersistenceServices(new InMemoryWireRecordPersistence(loadFixtureRecords(name))),
+    );
+    await ctx.restorePersisted();
+    const messages = ctx.get(IAgentContextMemoryService).get();
+    return {
+      replayed: ctx.get(IWireService).getModel(SpineModel) as SpineState,
+      derived: deriveSpineState(messages),
+      messages,
+      unexpected,
+    };
+  } finally {
+    resetUnexpectedErrorHandler();
+  }
+}
+
+/** The legacy-op acceptance: nothing in a real old log may be skipped. */
+function expectZeroSkips(unexpected: readonly unknown[]): void {
+  expect(unexpected.map(String)).toEqual([]);
+}
+
+function expectSpanInvariants(state: SpineState, messageCount: number): void {
+  for (const node of Object.values(state.nodes)) {
+    // A voided span (openedAt === SPINE_VOID_OPENED_AT) is fold-excluded and
+    // kept for reference only: its stale closedAt may index messages a prefix
+    // truncation cut away, so bounds apply to live spans only.
+    if (node.openedAt === SPINE_VOID_OPENED_AT) continue;
+    expect(node.openedAt, `${node.id} openedAt`).toBeGreaterThanOrEqual(0);
+    expect(node.openedAt, `${node.id} openedAt`).toBeLessThan(messageCount);
+    if (node.closedAt !== undefined) {
+      expect(node.closedAt, `${node.id} closedAt`).toBeGreaterThanOrEqual(0);
+      expect(node.closedAt, `${node.id} closedAt`).toBeLessThan(messageCount);
+      expect(node.closedAt, `${node.id} span`).toBeGreaterThanOrEqual(node.openedAt);
+    }
+  }
+  expect(state.openStack.length).toBeGreaterThan(0);
+  expect(state.openStack[0]).toBe(String(state.rootEpoch));
+  for (let i = 0; i < state.openStack.length; i++) {
+    const id = state.openStack[i]!;
+    const node = state.nodes[id];
+    expect(node, `openStack id ${id}`).toBeDefined();
+    expect(node?.closedAt, `openStack id ${id} stays open`).toBeUndefined();
+    if (i > 0) {
+      const parent = state.nodes[state.openStack[i - 1]!];
+      expect(parent?.children, `openStack ${state.openStack[i - 1]!} → ${id}`).toContain(id);
+    }
+  }
+}
+
+interface Span {
+  readonly openedAt: number;
+  readonly closedAt?: number;
+}
+
+function expectSpans(state: SpineState, spans: Readonly<Record<string, Span>>): void {
+  expect(Object.keys(state.nodes).sort()).toEqual(Object.keys(spans).sort());
+  for (const [id, span] of Object.entries(spans)) {
+    const node = state.nodes[id];
+    expect(node?.openedAt, `${id} openedAt`).toBe(span.openedAt);
+    expect(node?.closedAt, `${id} closedAt`).toBe(span.closedAt);
+  }
+}
+
+function parentOf(state: SpineState, id: string): string | null {
+  for (const [candidate, node] of Object.entries(state.nodes)) {
+    if (node.children.includes(id)) return candidate;
+  }
+  return null;
+}
+
+describe('Spine legacy wire replay (exact-match group)', () => {
+  /**
+   * Sessions written by the final op-based build (post-f0c56f31b anchors,
+   * verbatim memory) with no witness-removing undo: the derivation must
+   * reproduce the op-replayed tree field by field.
+   */
+  function expectSameTree(replayed: SpineState, derived: SpineState): void {
+    expect(Object.keys(derived.nodes).sort()).toEqual(Object.keys(replayed.nodes).sort());
+    for (const [id, r] of Object.entries(replayed.nodes)) {
+      const d = derived.nodes[id]!;
+      expect(d.summary, `${id} summary`).toBe(r.summary);
+      expect(d.openedAt, `${id} openedAt`).toBe(r.openedAt);
+      expect(d.closedAt, `${id} closedAt`).toBe(r.closedAt);
+      expect(d.memory, `${id} memory`).toBe(r.memory);
+      expect(d.children, `${id} children`).toEqual(r.children);
+      // Tolerated drift: token gauges and archive paths are not derivable.
+      expect(d.baselineTokens, `${id} baselineTokens`).toBeUndefined();
+      expect(d.finalTokens, `${id} finalTokens`).toBeUndefined();
+      expect(d.archivePath, `${id} archivePath`).toBeUndefined();
+    }
+    expect(derived.openStack).toEqual(replayed.openStack);
+    expect(derived.rootEpoch).toBe(replayed.rootEpoch);
+    expect(derived.epochStartAt).toBe(replayed.epochStartAt);
+    expect(derived.epochMemoryAt).toBe(replayed.epochMemoryAt);
+  }
+
+  it('legacy-open-close: 47-transition-free open/close chain replays identically', async () => {
+    const { replayed, derived, messages, unexpected } = await restoreFixture('legacy-open-close');
+    expectZeroSkips(unexpected);
+    expect(messages.length).toBe(34);
+    expect(Object.keys(replayed.nodes).length).toBe(5);
+    // The tolerated drift is real: the legacy ops carry token gauges.
+    expect(Object.values(replayed.nodes).some((n) => n.baselineTokens !== undefined)).toBe(true);
+    expectSameTree(replayed, derived);
+    expectSpanInvariants(replayed, messages.length);
+    expectSpanInvariants(derived, messages.length);
+  });
+
+  it('legacy-next: spine.next siblings and an open cursor replay identically', async () => {
+    const { replayed, derived, messages, unexpected } = await restoreFixture('legacy-next');
+    expectZeroSkips(unexpected);
+    expect(messages.length).toBe(41);
+    expect(Object.keys(replayed.nodes).length).toBe(5);
+    // Mid-session snapshot: the cursor node is still open.
+    expect(replayed.openStack).toEqual(['1', '1.1', '1.1.3']);
+    expect(replayed.nodes['1.1.3']?.closedAt).toBeUndefined();
+    expectSameTree(replayed, derived);
+    expectSpanInvariants(replayed, messages.length);
+    expectSpanInvariants(derived, messages.length);
+  });
+});
+
+describe('Spine legacy wire replay (receipt-anchor group)', () => {
+  /**
+   * The index of the first tool message answering the spine_close call whose
+   * carrier sits at `carrierIndex` — i.e. where a pre-f0c56f31b build
+   * anchored the span end.
+   */
+  function closeReceiptIndex(messages: readonly ContextMessage[], carrierIndex: number): number {
+    const carrier = messages[carrierIndex];
+    expect(carrier?.role, `carrier at ${carrierIndex}`).toBe('assistant');
+    const call = carrier?.toolCalls.find((c) => c.name === SPINE_TOOL_CLOSE);
+    expect(call, `spine_close call at ${carrierIndex}`).toBeDefined();
+    for (let i = carrierIndex + 1; i < messages.length; i++) {
+      const message = messages[i]!;
+      if (message.role === 'tool' && message.toolCallId === call!.id) return i;
+    }
+    throw new Error(`no receipt found for the close call at ${carrierIndex}`);
+  }
+
+  it('legacy-receipt-anchor: tree identical, closedAt pinned to the receipt index', async () => {
+    const { replayed, derived, messages, unexpected } = await restoreFixture('legacy-receipt-anchor');
+    expectZeroSkips(unexpected);
+    expect(messages.length).toBe(278);
+    expect(Object.keys(replayed.nodes).length).toBe(49);
+
+    // Tree shape and content agree everywhere — only span ends drift.
+    expect(Object.keys(derived.nodes).sort()).toEqual(Object.keys(replayed.nodes).sort());
+    let closedCount = 0;
+    for (const [id, d] of Object.entries(derived.nodes)) {
+      const r = replayed.nodes[id]!;
+      expect(r.summary, `${id} summary`).toBe(d.summary);
+      expect(r.children, `${id} children`).toEqual(d.children);
+      expect(r.memory, `${id} memory`).toBe(d.memory);
+      expect(r.openedAt, `${id} openedAt`).toBe(d.openedAt);
+      if (d.closedAt === undefined) continue;
+      closedCount++;
+      // Pre-f0c56f31b anchor: the persisted span end IS the receipt index;
+      // the derivation ends the span right before the carrier instead.
+      const carrier = d.closedAt + 1;
+      expect(r.closedAt, `${id} closedAt anchors at the receipt`).toBe(
+        closeReceiptIndex(messages, carrier),
+      );
+      expect(r.closedAt, `${id} drift`).toBeGreaterThan(d.closedAt);
+    }
+    expect(closedCount).toBe(47);
+    expect(derived.openStack).toEqual(replayed.openStack);
+    expectSpanInvariants(replayed, messages.length);
+    expectSpanInvariants(derived, messages.length);
+  });
+
+  it('legacy-root-compact: two epochs identical, spans and one memory pinned', async () => {
+    const { replayed, derived, messages, unexpected } = await restoreFixture('legacy-root-compact');
+    expectZeroSkips(unexpected);
+    expect(messages.length).toBe(80);
+
+    // The root_compact acceptance: the derivation reconstructs the epoch
+    // boundary from the compaction-summary message exactly as the persisted
+    // spine.root_compact op replayed it.
+    expect(derived.rootEpoch).toBe(2);
+    expect(derived.epochStartAt).toBe(71);
+    expect(derived.epochMemoryAt).toBe(70);
+    expect(replayed.rootEpoch).toBe(2);
+    expect(replayed.epochStartAt).toBe(71);
+    expect(replayed.epochMemoryAt).toBe(70);
+    expect(derived.openStack).toEqual(['2', '2.1']);
+    expect(replayed.openStack).toEqual(['2', '2.1']);
+
+    // Tree shape and content agree (ids, summaries, children).
+    expect(Object.keys(derived.nodes).sort()).toEqual(Object.keys(replayed.nodes).sort());
+    for (const [id, d] of Object.entries(derived.nodes)) {
+      const r = replayed.nodes[id]!;
+      expect(r.summary, `${id} summary`).toBe(d.summary);
+      expect(r.children, `${id} children`).toEqual(d.children);
+    }
+
+    // Pre-f0c56f31b span anchors (this 2026-07-10 build also anchored nested
+    // opens late): both span tables pinned exactly.
+    expectSpans(replayed, {
+      1: { openedAt: SPINE_VOID_OPENED_AT },
+      2: { openedAt: SPINE_VOID_OPENED_AT },
+      '1.1': { openedAt: 0 },
+      '1.1.1': { openedAt: 1, closedAt: 65 },
+      '1.1.1.1': { openedAt: 4, closedAt: 16 },
+      '1.1.1.2': { openedAt: 17, closedAt: 36 },
+      '1.1.1.3': { openedAt: 37, closedAt: 50 },
+      '1.1.1.4': { openedAt: 51, closedAt: 61 },
+      '2.1': { openedAt: 71 },
+    });
+    expectSpans(derived, {
+      1: { openedAt: SPINE_VOID_OPENED_AT },
+      2: { openedAt: SPINE_VOID_OPENED_AT },
+      '1.1': { openedAt: 0 },
+      '1.1.1': { openedAt: 1, closedAt: 63 },
+      '1.1.1.1': { openedAt: 4, closedAt: 14 },
+      '1.1.1.2': { openedAt: 15, closedAt: 34 },
+      '1.1.1.3': { openedAt: 35, closedAt: 48 },
+      '1.1.1.4': { openedAt: 49, closedAt: 58 },
+      '2.1': { openedAt: 71 },
+    });
+
+    // P5 memory-form difference on the one node with closed children: the
+    // legacy op stored an assembleMemoryBody() composite (from an interrupted
+    // pending commit); the derivation keeps the surviving close call's body
+    // verbatim. Values are the sanitization dictionary's placeholders.
+    expect(replayed.nodes['1.1.1']?.memory).toBe('memory_88');
+    expect(derived.nodes['1.1.1']?.memory).toBe('memory_87');
+    for (const id of ['1.1.1.1', '1.1.1.2', '1.1.1.3', '1.1.1.4']) {
+      expect(derived.nodes[id]?.memory, `${id} memory`).toBe(replayed.nodes[id]?.memory);
+    }
+
+    expectSpanInvariants(replayed, messages.length);
+    expectSpanInvariants(derived, messages.length);
+  });
+});
+
+describe('Spine legacy wire replay (undo-divergence group)', () => {
+  it('legacy-undo-divergence: both topologies and their documented relationship', async () => {
+    const { replayed, derived, messages, unexpected } = await restoreFixture('legacy-undo-divergence');
+    expectZeroSkips(unexpected);
+    expect(messages.length).toBe(592);
+    expectSpanInvariants(replayed, messages.length);
+    expectSpanInvariants(derived, messages.length);
+
+    // ---- The op-replay world (frozen at crash time): 32 nodes. ----
+    expect(Object.keys(replayed.nodes).length).toBe(32);
+    expect(replayed.openStack).toEqual(['1', '1.1', '1.1.28']);
+    expect(replayed.nodes['1']?.children).toEqual(['1.1']);
+    const replayedWorkChildren = replayed.nodes['1.1']?.children ?? [];
+    expect(replayedWorkChildren.length).toBe(28);
+    expect(replayedWorkChildren.slice(0, 8)).toEqual([
+      '1.1.1', '1.1.2', '1.1.3', '1.1.4', '1.1.5', '1.1.6', '1.1.7', '1.1.8',
+    ]);
+    expect(replayedWorkChildren).toContain('1.1.9');
+    expect(replayedWorkChildren.at(-1)).toBe('1.1.28');
+    // truncate_repair voided the spans whose witnesses the first and last
+    // undos removed (openedAt = SPINE_VOID_OPENED_AT, kept for reference).
+    expect(replayed.nodes['1.1.2']?.openedAt).toBe(SPINE_VOID_OPENED_AT);
+    expect(replayed.nodes['1.1.2']?.closedAt).toBe(41);
+    expect(replayed.nodes['1.1.27']?.openedAt).toBe(SPINE_VOID_OPENED_AT);
+    expect(replayed.nodes['1.1.27']?.closedAt).toBe(601);
+    // The nesting the second undo made unwitnessed: 1.1.8 → {1.1.8.1, 1.1.8.2}.
+    expect(replayed.nodes['1.1.8']?.children).toEqual(['1.1.8.1', '1.1.8.2']);
+    expect(replayed.nodes['1.1.8']?.openedAt).toBe(160);
+    expect(replayed.nodes['1.1.8']?.closedAt).toBe(180);
+    expect(replayed.nodes['1.1.8.1']?.openedAt).toBe(161);
+    expect(replayed.nodes['1.1.8.1']?.closedAt).toBe(167);
+    expect(replayed.nodes['1.1.8.2']?.openedAt).toBe(172);
+    expect(replayed.nodes['1.1.8.2']?.closedAt).toBe(177);
+    // The node whose open the third undo unwitnessed: kept frozen by the ops.
+    expect(replayed.nodes['1.1.9']?.openedAt).toBe(181);
+    expect(replayed.nodes['1.1.9']?.closedAt).toBe(181);
+
+    // ---- The derivation (surviving-stream truth): exact topology. ----
+    const DERIVED_TOPOLOGY: Readonly<Record<string, { parent: string | null } & Span>> = {
+      1: { parent: null, openedAt: SPINE_VOID_OPENED_AT },
+      '1.1': { parent: '1', openedAt: 0, closedAt: 181 },
+      '1.1.1': { parent: '1.1', openedAt: 1, closedAt: 12 },
+      '1.1.2': { parent: '1.1', openedAt: 17, closedAt: 46 },
+      '1.1.3': { parent: '1.1', openedAt: 51, closedAt: 88 },
+      '1.1.4': { parent: '1.1', openedAt: 102, closedAt: 115 },
+      '1.1.5': { parent: '1.1', openedAt: 120, closedAt: 129 },
+      '1.1.6': { parent: '1.1', openedAt: 134, closedAt: 156 },
+      '1.1.7': { parent: '1.1', openedAt: 161, closedAt: 167 },
+      '1.1.8': { parent: '1.1', openedAt: 172, closedAt: 177 },
+      '1.2': { parent: '1', openedAt: 182, closedAt: 198 },
+      '1.3': { parent: '1', openedAt: 205, closedAt: 209 },
+      '1.4': { parent: '1', openedAt: 214, closedAt: 226 },
+      '1.5': { parent: '1', openedAt: 231, closedAt: 262 },
+      '1.6': { parent: '1', openedAt: 267, closedAt: 274 },
+      '1.7': { parent: '1', openedAt: 279, closedAt: 284 },
+      '1.8': { parent: '1', openedAt: 289, closedAt: 291 },
+      '1.9': { parent: '1', openedAt: 296, closedAt: 304 },
+      '1.10': { parent: '1', openedAt: 309, closedAt: 342 },
+      '1.11': { parent: '1', openedAt: 347, closedAt: 375 },
+      '1.12': { parent: '1', openedAt: 381, closedAt: 390 },
+      '1.13': { parent: '1', openedAt: 397, closedAt: 405 },
+      '1.14': { parent: '1', openedAt: 415, closedAt: 423 },
+      '1.15': { parent: '1', openedAt: 449, closedAt: 460 },
+      '1.16': { parent: '1', openedAt: 461, closedAt: 526 },
+      '1.17': { parent: '1', openedAt: 529, closedAt: 564 },
+      '1.18': { parent: '1', openedAt: 571, closedAt: 580 },
+      '1.19': { parent: '1', openedAt: 590 },
+    };
+    expect(Object.keys(derived.nodes).sort()).toEqual(Object.keys(DERIVED_TOPOLOGY).sort());
+    for (const [id, expected] of Object.entries(DERIVED_TOPOLOGY)) {
+      const node = derived.nodes[id];
+      expect(node?.openedAt, `${id} openedAt`).toBe(expected.openedAt);
+      expect(node?.closedAt, `${id} closedAt`).toBe(expected.closedAt);
+      expect(parentOf(derived, id), `${id} parent`).toBe(expected.parent);
+    }
+    expect(derived.openStack).toEqual(['1', '1.19']);
+    expect(derived.rootEpoch).toBe(1);
+    expect(derived.epochStartAt).toBe(0);
+    expect(derived.epochMemoryAt).toBeUndefined();
+
+    // ---- The documented relationship between the two worlds. ----
+    // Undo #3 unwitnessed 1.1.9's open: the surviving spine.next closes the
+    // derivation's cursor (the startup node) with 1.1.9's redirect memory and
+    // re-parents everything after it to the root epoch.
+    expect(derived.nodes['1.1.9']).toBeUndefined();
+    expect(derived.nodes['1.1.8.1']).toBeUndefined();
+    expect(derived.nodes['1.1.27']).toBeUndefined();
+    expect(derived.nodes['1.1']?.memory).toBe(replayed.nodes['1.1.9']?.memory);
+    expect(derived.nodes['1.2']?.summary).toBe(replayed.nodes['1.1.10']?.summary);
+    // Undo #1 unwitnessed the first "1.1.2": the derivation reuses the id for
+    // the redo the ops numbered 1.1.3 (the whole 1.1.x series shifts by one).
+    expect(derived.nodes['1.1.2']?.summary).toBe(replayed.nodes['1.1.3']?.summary);
+    // Undo #2 unwitnessed 1.1.8's open: nested 1.1.8.1/1.1.8.2 flatten into
+    // the derivation's sibling 1.1.7/1.1.8.
+    expect(derived.nodes['1.1.7']?.summary).toBe(replayed.nodes['1.1.8.1']?.summary);
+    expect(derived.nodes['1.1.8']?.summary).toBe(replayed.nodes['1.1.8.2']?.summary);
+    // The last undo (cut=589) voided 1.1.27 in the op world; the derivation's
+    // open cursor is the redo the ops numbered 1.1.28.
+    expect(derived.nodes['1.19']?.summary).toBe(replayed.nodes['1.1.28']?.summary);
+  });
+});

packages/agent-core-v2/test/spine/spawnExecutor.test.ts

@@ -0,0 +1,290 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import type { IAgentScopeHandle } from '#/_base/di/scope';
+import type { IAgentLifecycleService } from '#/session/agentLifecycle/agentLifecycle';
+import type {
+  AgentRunHandle,
+  AgentRunRequest,
+  ISessionSubagentService,
+  RunAgentOptions,
+} from '#/session/subagent/subagent';
+import type { SpineSpawnTaskInput } from '#/agent/spine/spine';
+import {
+  executeSpawnBranches,
+  maxSpawnBranchCount,
+  resolveMaxThreads,
+  taskEnvelope,
+  type SpawnBranchResult,
+} from '#/agent/spine/spineSpawn';
+
+interface FakeAgent {
+  readonly id: string;
+  removed: boolean;
+  cancelled: boolean;
+  completionValue: Promise<{ summary: string }>;
+}
+
+function fakeRunHandle(turnId: number, completion: Promise<{ summary: string }>): AgentRunHandle {
+  const controller = new AbortController();
+  return {
+    agentId: `agent-${String(turnId)}`,
+    turn: {
+      id: turnId,
+      signal: controller.signal,
+      cancel: (reason?: unknown) => {
+        controller.abort(reason);
+        return true;
+      },
+      ready: Promise.resolve(),
+      result: Promise.resolve({ type: 'completed', steps: 0 } as never),
+    },
+    completion,
+  };
+}
+
+function buildFakes(tasks: readonly SpineSpawnTaskInput[]): {
+  readonly lifecycle: IAgentLifecycleService;
+  readonly subagentService: ISessionSubagentService;
+  readonly agents: FakeAgent[];
+  readonly runCompletionControllers: ReturnType<typeof buildCompletionController>[];
+} {
+  const agents: FakeAgent[] = [];
+  const runCompletionControllers = tasks.map(() => buildCompletionController());
+
+  const lifecycle: IAgentLifecycleService = {
+    _serviceBrand: undefined,
+    onDidCreate: { event: () => ({ dispose: () => undefined }) } as never,
+    onDidDispose: { event: () => ({ dispose: () => undefined }) } as never,
+    create: () => Promise.reject(new Error('not used')),
+    fork: async (_sourceAgentId, opts) => {
+      const id = `agent-${String(agents.length)}`;
+      const agent: FakeAgent = {
+        id,
+        removed: false,
+        cancelled: false,
+        completionValue: Promise.resolve({ summary: '' }),
+      };
+      agents.push(agent);
+      return {
+        id,
+        accessor: {
+          get: () => {
+            throw new Error('unexpected accessor call');
+          },
+        },
+        dispose: () => undefined,
+      } as unknown as IAgentScopeHandle;
+    },
+    get: () => undefined,
+    list: () => [],
+    broadcastPermissionMode: () => undefined,
+    remove: async (agentId) => {
+      const agent = agents.find((a) => a.id === agentId);
+      if (agent !== undefined) agent.removed = true;
+    },
+  };
+
+  const subagentService: ISessionSubagentService = {
+    _serviceBrand: undefined,
+    hooks: { onWillStartAgentTask: { register: () => ({ dispose: () => undefined }) } },
+    onDidStopAgentTask: { event: () => ({ dispose: () => undefined }) },
+    run: async (agentId: string, _request: AgentRunRequest, opts: RunAgentOptions) => {
+      const index = agents.findIndex((a) => a.id === agentId);
+      const agent = agents[index];
+      if (agent === undefined) throw new Error(`unknown agent ${agentId}`);
+      const controller = runCompletionControllers[index];
+      if (controller === undefined) throw new Error(`no completion controller for ${agentId}`);
+
+      // Wire cancellation: when the provided signal aborts, cancel the turn.
+      const onAbort = () => {
+        agent.cancelled = true;
+      };
+      opts.signal.addEventListener('abort', onAbort, { once: true });
+
+      agent.completionValue = controller.promise;
+      const completion = agent.completionValue.finally(() => {
+        opts.signal.removeEventListener('abort', onAbort);
+      });
+      return fakeRunHandle(index, completion);
+    },
+    notifyAgentTaskStopped: () => undefined,
+  } as unknown as ISessionSubagentService;
+
+  return { lifecycle, subagentService, agents, runCompletionControllers };
+}
+
+function buildCompletionController() {
+  let resolve!: (value: { summary: string }) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<{ summary: string }>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
+function makeSignal(): AbortSignal {
+  return new AbortController().signal;
+}
+
+const TASKS: SpineSpawnTaskInput[] = [
+  { summary: 'branch A', prompt: 'do A' },
+  { summary: 'branch B', prompt: 'do B' },
+];
+
+describe('executeSpawnBranches', () => {
+  it('forks with trimTrailingToolCallBatch enabled', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    const forkSpy = vi.spyOn(lifecycle, 'fork');
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.resolve({ summary: 'memory A' });
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    await promise;
+    expect(forkSpy).toHaveBeenCalledTimes(2);
+    expect(forkSpy).toHaveBeenCalledWith('main', { trimTrailingToolCallBatch: true });
+  });
+
+  it('wraps the task in the expected envelope', () => {
+    const envelope = taskEnvelope({ summary: 'branch A', prompt: 'do A' });
+    expect(envelope).toContain('You are one branch of a spine_spawn fission');
+    expect(envelope).toContain('The original continuation is suspended during this fission');
+    expect(envelope).toContain('no supervisory model is active');
+    expect(envelope).toContain('Branch label and outcome: branch A');
+    expect(envelope).toContain('Assignment:\ndo A');
+    expect(envelope).toContain('When you finish, return only the terminal memory for this branch.');
+  });
+
+  it('returns a completed receipt when all branches succeed', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.resolve({ summary: 'memory A' });
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    const results = await promise;
+    expect(results).toEqual<readonly SpawnBranchResult[]>([
+      { summary: 'branch A', outcome: 'completed', memoryBody: 'memory A' },
+      { summary: 'branch B', outcome: 'completed', memoryBody: 'memory B' },
+    ]);
+  });
+
+  it('isolates a single errored branch and keeps the rest', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.reject(new Error('boom'));
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    const results = await promise;
+    expect(results[0]?.outcome).toBe('errored');
+    expect(results[0]?.diagnostic).toContain('boom');
+    expect(results[1]).toEqual({ summary: 'branch B', outcome: 'completed', memoryBody: 'memory B' });
+  });
+
+  it('isolates a single aborted branch and keeps the rest', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    const abortError = new Error('user cancelled');
+    abortError.name = 'AbortError';
+    runCompletionControllers[0]!.reject(abortError);
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    const results = await promise;
+    expect(results[0]?.outcome).toBe('aborted');
+    expect(results[0]?.diagnostic).toContain('user cancelled');
+    expect(results[1]).toEqual({ summary: 'branch B', outcome: 'completed', memoryBody: 'memory B' });
+  });
+
+  it('treats an empty summary as errored', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.resolve({ summary: '   ' });
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    const results = await promise;
+    expect(results[0]?.outcome).toBe('errored');
+    expect(results[0]?.diagnostic).toBe('child completed without a non-empty final memory');
+    expect(results[0]?.memoryBody).toBe('child completed without a non-empty final memory');
+    expect(results[1]).toEqual({ summary: 'branch B', outcome: 'completed', memoryBody: 'memory B' });
+  });
+
+  it('aborts unfinished branches when the turn signal is aborted and releases all agents', async () => {
+    const { lifecycle, subagentService, agents } = buildFakes(TASKS);
+    const controller = new AbortController();
+    const promise = executeSpawnBranches(
+      { lifecycle, subagentService },
+      TASKS,
+      controller.signal,
+    );
+    // Let both starts land, then abort before any branch completes.
+    await Promise.resolve();
+    controller.abort('turn cancelled');
+    const results = await promise;
+    expect(results.every((r) => r.outcome === 'aborted')).toBe(true);
+    expect(agents.every((a) => a.removed)).toBe(true);
+  });
+
+  it('releases all agents in finally even when some fail', async () => {
+    const { lifecycle, subagentService, agents, runCompletionControllers } = buildFakes(TASKS);
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.resolve({ summary: 'memory A' });
+    runCompletionControllers[1]!.reject(new Error('boom'));
+    await promise;
+    expect(agents.every((a) => a.removed)).toBe(true);
+  });
+
+  it('errors a branch whose fork fails, aborts live siblings, and still releases them', async () => {
+    const { lifecycle, subagentService, agents, runCompletionControllers } = buildFakes(TASKS);
+    const originalFork = lifecycle.fork;
+    let forkCalls = 0;
+    lifecycle.fork = async (sourceAgentId, opts) => {
+      forkCalls += 1;
+      if (forkCalls === 2) throw new Error('fork denied');
+      return originalFork(sourceAgentId, opts);
+    };
+
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    // The started branch's run is cancelled by the batch; simulate its turn
+    // settling as an abort, the way a cancelled turn's completion rejects.
+    const abortError = new Error('turn cancelled');
+    abortError.name = 'AbortError';
+    runCompletionControllers[0]!.reject(abortError);
+    const results = await promise;
+
+    expect(results[0]?.outcome).toBe('aborted');
+    expect(results[0]?.diagnostic).toContain('a sibling branch failed to start');
+    expect(results[1]?.outcome).toBe('errored');
+    expect(results[1]?.diagnostic).toContain('fork denied');
+    // Only one fork succeeded, and that agent was released despite the failure.
+    expect(agents).toHaveLength(1);
+    expect(agents[0]?.removed).toBe(true);
+  });
+
+  it('returns results even when releasing a branch fails', async () => {
+    const { lifecycle, subagentService, runCompletionControllers } = buildFakes(TASKS);
+    lifecycle.remove = async () => {
+      throw new Error('remove failed');
+    };
+    const promise = executeSpawnBranches({ lifecycle, subagentService }, TASKS, makeSignal());
+    runCompletionControllers[0]!.resolve({ summary: 'memory A' });
+    runCompletionControllers[1]!.resolve({ summary: 'memory B' });
+    const results = await promise;
+    expect(results.every((r) => r.outcome === 'completed')).toBe(true);
+  });
+});
+
+describe('resolveMaxThreads', () => {
+  it('defaults to 4', () => {
+    expect(resolveMaxThreads(undefined)).toBe(4);
+    expect(resolveMaxThreads('')).toBe(4);
+  });
+
+  it('parses a valid positive integer', () => {
+    expect(resolveMaxThreads('8')).toBe(8);
+  });
+
+  it('falls back for invalid values', () => {
+    expect(resolveMaxThreads('abc')).toBe(4);
+    expect(resolveMaxThreads('1')).toBe(4);
+    expect(resolveMaxThreads('3.5')).toBe(4);
+  });
+
+  it('computes branch capacity as maxThreads - 1', () => {
+    expect(maxSpawnBranchCount(4)).toBe(3);
+    expect(maxSpawnBranchCount(2)).toBe(1);
+  });
+});

packages/agent-core-v2/test/spine/spine.test.ts

@@ -11,11 +11,14 @@ import { SPINE_FLAG_ID } from '#/agent/spine/flag';
 import { SpineCloseTool } from '#/agent/spine/tools/spine-close';
 import { SpineNextTool } from '#/agent/spine/tools/spine-next';
 import { SpineOpenTool } from '#/agent/spine/tools/spine-open';
+import { SpineSpawnTool } from '#/agent/spine/tools/spine-spawn';
 import { SpineTreeTool } from '#/agent/spine/tools/spine-tree';
+import { SpineTrimTool } from '#/agent/spine/tools/spine-trim';
 import { IAgentScopeContext } from '#/agent/scopeContext/scopeContext';
 import { IFlagService } from '#/app/flag/flag';
 import { getToolContributions } from '#/agent/toolRegistry/toolContribution';
 import type { ServicesAccessor } from '#/_base/di/instantiation';
+import { IAgentContextMemoryService } from '#/agent/contextMemory/contextMemory';
 import type { ContextMessage } from '#/agent/contextMemory/types';
 import {
   IAgentSpineService,
@@ -33,6 +36,7 @@ import type { Message } from '#/kosong/contract/message';
 import {
   createCommandRunner,
   execEnvServices,
+  sessionService,
   testAgent,
   type TestAgentContext,
   type TestAgentOptions,
@@ -259,7 +263,7 @@ describe('Spine control tools', () => {
     vi.unstubAllEnvs();
   });
 
-  it('registers the four spine tools when enabled', () => {
+  it('registers the four core spine tools when enabled', () => {
     const ctx = testAgent();
     const names = spineToolNames(ctx);
     expect(names).toEqual(
@@ -268,6 +272,28 @@ describe('Spine control tools', () => {
     expect(names).toHaveLength(4);
   });
 
+  it('registers spine_spawn when the spawn flag is also on', () => {
+    vi.stubEnv('KIMI_CODE_SPINE_SPAWN', '1');
+    const ctx = testAgent();
+    expect(spineToolNames(ctx)).toContain('spine_spawn');
+  });
+
+  it('does not register spine_spawn without the spawn flag', () => {
+    const ctx = testAgent();
+    expect(spineToolNames(ctx)).not.toContain('spine_spawn');
+  });
+
+  it('registers spine_trim when the trim flag is also on', () => {
+    vi.stubEnv('KIMI_CODE_SPINE_TRIM', '1');
+    const ctx = testAgent();
+    expect(spineToolNames(ctx)).toContain('spine_trim');
+  });
+
+  it('does not register spine_trim without the trim flag', () => {
+    const ctx = testAgent();
+    expect(spineToolNames(ctx)).not.toContain('spine_trim');
+  });
+
   it('default agent profile whitelists the spine tools', () => {
     // The profile's active-tool whitelist gates what reaches the LLM request.
     // If the spine tools are absent here, `profile.isToolActive` filters them
@@ -276,14 +302,14 @@ describe('Spine control tools', () => {
     const ctx = testAgent();
     const profile = ctx.get(IAgentProfileCatalogService).getDefault();
     expect(profile.tools).toEqual(
-      expect.arrayContaining(['spine_open', 'spine_close', 'spine_next', 'spine_tree']),
+      expect.arrayContaining(['spine_open', 'spine_close', 'spine_next', 'spine_tree', 'spine_trim', 'spine_spawn']),
     );
   });
 
   it('keeps spine tools active under a whitelist that lists them', () => {
     const ctx = testAgent();
     ctx.configure({
-      tools: ['Read', 'spine_open', 'spine_close', 'spine_next', 'spine_tree'],
+      tools: ['Read', 'spine_open', 'spine_close', 'spine_next', 'spine_tree', 'spine_trim', 'spine_spawn'],
     });
     const spine = ctx.toolsData().filter((tool) => tool.name.startsWith('spine_'));
     expect(spine).toHaveLength(4);
@@ -771,34 +797,51 @@ describe('spine control tool main-agent gating', () => {
     ['spine_close', SpineCloseTool],
     ['spine_next', SpineNextTool],
     ['spine_tree', SpineTreeTool],
+    ['spine_trim', SpineTrimTool],
+    ['spine_spawn', SpineSpawnTool],
   ] as const;
 
-  function accessorFor(agentId: string, spineEnabled: boolean): ServicesAccessor {
+  function accessorFor(agentId: string, flags: { spine: boolean; trim: boolean; spawn: boolean }): ServicesAccessor {
     const scopeContext: IAgentScopeContext = {
       _serviceBrand: undefined,
       agentId,
       scope: () => '',
     };
-    const flags = {
-      enabled: (id: string) => id === SPINE_FLAG_ID && spineEnabled,
+    const flagService = {
+      enabled: (id: string) => {
+        if (id === SPINE_FLAG_ID) return flags.spine;
+        if (id === 'spine_trim') return flags.trim;
+        if (id === 'spine_spawn') return flags.spawn;
+        return false;
+      },
     } as unknown as IFlagService;
     return {
       get: (id: unknown) => {
         if (id === IAgentScopeContext) return scopeContext;
-        if (id === IFlagService) return flags;
+        if (id === IFlagService) return flagService;
         throw new Error(`unexpected service identifier: ${String(id)}`);
       },
     } as unknown as ServicesAccessor;
   }
 
-  it.each(gatedTools)('%s registers only on the main agent with the flag on', (name, ctor) => {
+  it.each(gatedTools)('%s registers only on the main agent with the required flags', (name, ctor) => {
     const contribution = getToolContributions().find((c) => c.ctor === ctor);
     expect(contribution, `${name} contribution`).toBeDefined();
     const when = contribution?.options.when;
-    expect(when, `${name} must gate on flag + main-agent identity`).toBeDefined();
-    expect(when?.(accessorFor('main', true))).toBe(true);
-    expect(when?.(accessorFor('sub-1', true))).toBe(false);
-    expect(when?.(accessorFor('main', false))).toBe(false);
+    expect(when, `${name} must gate on flags + main-agent identity`).toBeDefined();
+    const needsSpawn = name === 'spine_spawn';
+    const needsTrim = name === 'spine_trim';
+    expect(when?.(accessorFor('main', { spine: true, trim: needsTrim, spawn: needsSpawn }))).toBe(true);
+    expect(when?.(accessorFor('sub-1', { spine: true, trim: needsTrim, spawn: needsSpawn }))).toBe(false);
+    expect(when?.(accessorFor('main', { spine: false, trim: needsTrim, spawn: needsSpawn }))).toBe(false);
+  });
+
+  it('spine_spawn requires capacity for at least two branches', () => {
+    vi.stubEnv('KIMI_CODE_SPINE_SPAWN_MAX_THREADS', '2');
+    const contribution = getToolContributions().find((c) => c.ctor === SpineSpawnTool);
+    const when = contribution?.options.when;
+    expect(when?.(accessorFor('main', { spine: true, trim: false, spawn: true }))).toBe(false);
+    vi.unstubAllEnvs();
   });
 });
 
@@ -900,3 +943,250 @@ function spineReceipt(toolCallId: string): ContextMessage {
     toolCallId,
   };
 }
+import { IAgentLoopService } from '#/agent/loop/loop';
+import { ISessionSubagentService } from '#/session/subagent/subagent';
+import type { AgentRunHandle } from '#/session/subagent/subagent';
+import { IAgentLifecycleService } from '#/session/agentLifecycle/agentLifecycle';
+import type { IAgentScopeHandle } from '#/_base/di/scope';
+
+/**
+ * Minimal working `IAgentLifecycleService.fork` for spawn tests: mints
+ * `agent-N` ids in order so the paired `mockSubagentService` summaries line
+ * up. The run side is faked separately, so no context copying is needed.
+ */
+function mockLifecycleService(): IAgentLifecycleService {
+  let minted = 0;
+  const handles = new Map<string, IAgentScopeHandle>();
+  return {
+    _serviceBrand: undefined,
+    onDidCreate: () => ({ dispose: () => undefined }),
+    onDidDispose: () => ({ dispose: () => undefined }),
+    create: () => Promise.reject(new Error('create is not used in spawn tests')),
+    fork: (sourceAgentId: string, _opts?: unknown) => {
+      if (sourceAgentId !== 'main') return Promise.reject(new Error(`unknown source ${sourceAgentId}`));
+      const id = `agent-${String(minted++)}`;
+      const handle = { id } as unknown as IAgentScopeHandle;
+      handles.set(id, handle);
+      return Promise.resolve(handle);
+    },
+    get: (agentId: string) => handles.get(agentId),
+    list: () => [...handles.values()],
+    broadcastPermissionMode: () => undefined,
+    remove: (agentId: string) => {
+      handles.delete(agentId);
+      return Promise.resolve();
+    },
+  } as unknown as IAgentLifecycleService;
+}
+
+function mockSubagentService(
+  summaries: Record<string, string>,
+): ISessionSubagentService {
+  return {
+    _serviceBrand: undefined,
+    hooks: { onWillStartAgentTask: { register: () => ({ dispose: () => undefined }) } },
+    onDidStopAgentTask: () => ({ dispose: () => undefined }),
+    run: async (agentId: string) => {
+      const summary = summaries[agentId] ?? '';
+      const controller = new AbortController();
+      const handle: AgentRunHandle = {
+        agentId,
+        turn: {
+          id: 1,
+          signal: controller.signal,
+          cancel: () => {
+            controller.abort();
+            return true;
+          },
+          ready: Promise.resolve(),
+          result: Promise.resolve({ type: 'completed', steps: 0 } as never),
+        },
+        completion: Promise.resolve({ summary }),
+      };
+      return handle;
+    },
+    notifyAgentTaskStopped: () => undefined,
+  } as unknown as ISessionSubagentService;
+}
+
+function buildCompletionController() {
+  let resolve!: (value: { summary: string }) => void;
+  let reject!: (reason?: unknown) => void;
+  const promise = new Promise<{ summary: string }>((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  return { promise, resolve, reject };
+}
+
+describe('spine_spawn service', () => {
+  beforeEach(() => {
+    vi.stubEnv(MASTER_ENV, '0');
+    vi.stubEnv(SPINE_ENV, '1');
+    vi.stubEnv('KIMI_CODE_SPINE_SPAWN', '1');
+  });
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it('rejects spawn when it conflicts with another transition in the same step', async () => {
+    const ctx = testAgent();
+    const spine = ctx.get(IAgentSpineService);
+    spine.acceptOpen('task A');
+    const result = await spine.executeSpawn(
+      [
+        { summary: 'branch A', prompt: 'do A' },
+        { summary: 'branch B', prompt: 'do B' },
+      ],
+      new AbortController().signal,
+    );
+    expect(result.accepted).toBe(false);
+    if (!result.accepted) {
+      expect(result.reason).toContain('at most one Spine transition');
+    }
+  });
+
+  it('rejects a second spawn in the same step', async () => {
+    const ctx = testAgent(
+      sessionService(IAgentLifecycleService, mockLifecycleService()),
+      sessionService(ISessionSubagentService, mockSubagentService({})),
+    );
+    const spine = ctx.get(IAgentSpineService);
+    const first = await spine.executeSpawn(
+      [
+        { summary: 'branch A', prompt: 'do A' },
+        { summary: 'branch B', prompt: 'do B' },
+      ],
+      new AbortController().signal,
+    );
+    expect(first.accepted).toBe(true);
+    const second = await spine.executeSpawn(
+      [
+        { summary: 'branch C', prompt: 'do C' },
+        { summary: 'branch D', prompt: 'do D' },
+      ],
+      new AbortController().signal,
+    );
+    expect(second.accepted).toBe(false);
+    if (!second.accepted) {
+      expect(second.reason).toContain('at most one Spine transition');
+    }
+  });
+
+  it('rejects all-or-nothing when capacity is unavailable', async () => {
+    vi.stubEnv('KIMI_CODE_SPINE_SPAWN_MAX_THREADS', '3');
+    const completions: ReturnType<typeof buildCompletionController>[] = [];
+    const hangingSubagent: ISessionSubagentService = {
+      _serviceBrand: undefined,
+      hooks: { onWillStartAgentTask: { register: () => ({ dispose: () => undefined }) } },
+      onDidStopAgentTask: () => ({ dispose: () => undefined }),
+      run: async (agentId: string) => {
+        const controller = new AbortController();
+        const completion = buildCompletionController();
+        completions.push(completion);
+        return {
+          agentId,
+          turn: {
+            id: 1,
+            signal: controller.signal,
+            cancel: () => {
+              controller.abort();
+              return true;
+            },
+            ready: Promise.resolve(),
+            result: Promise.resolve({ type: 'completed', steps: 0 } as never),
+          },
+          completion: completion.promise,
+        } as AgentRunHandle;
+      },
+      notifyAgentTaskStopped: () => undefined,
+    } as unknown as ISessionSubagentService;
+
+    const ctx = testAgent(
+      sessionService(IAgentLifecycleService, mockLifecycleService()),
+      sessionService(ISessionSubagentService, hangingSubagent),
+    );
+    const spine = ctx.get(IAgentSpineService);
+
+    // Start the first batch but do not let it complete so activeSpawnBranches stays at 2.
+    const firstPromise = spine.executeSpawn(
+      [
+        { summary: 'branch A', prompt: 'do A' },
+        { summary: 'branch B', prompt: 'do B' },
+      ],
+      new AbortController().signal,
+    );
+    await Promise.resolve();
+
+    // A second overlapping batch of two cannot fit under the limit of 2.
+    const second = await spine.executeSpawn(
+      [
+        { summary: 'branch C', prompt: 'do C' },
+        { summary: 'branch D', prompt: 'do D' },
+      ],
+      new AbortController().signal,
+    );
+    expect(second.accepted).toBe(false);
+    if (!second.accepted) {
+      expect(second.reason).toContain('aggregate admission requested 2 child agents');
+      expect(second.reason).toContain('all-or-nothing');
+      expect(second.reason).toContain('KIMI_CODE_SPINE_SPAWN_MAX_THREADS');
+    }
+
+    // Unblock the first batch and drain it.
+    completions.forEach((c) => c.resolve({ summary: 'done' }));
+    await firstPromise;
+  });
+
+  it('produces a receipt that derive accepts and synthesizes closed nodes', async () => {
+    const ctx = testAgent(
+      sessionService(IAgentLifecycleService, mockLifecycleService()),
+      sessionService(
+        ISessionSubagentService,
+        mockSubagentService({
+          'agent-0': 'memory A',
+          'agent-1': 'memory B',
+        }),
+      ),
+    );
+    const spine = ctx.get(IAgentSpineService);
+    const result = await spine.executeSpawn(
+      [
+        { summary: 'branch A', prompt: 'do A' },
+        { summary: 'branch B', prompt: 'do B' },
+      ],
+      new AbortController().signal,
+    );
+    expect(result.accepted).toBe(true);
+    expect(result.receipt).toBeDefined();
+    const receipt = JSON.parse(result.receipt!);
+    expect(receipt.schema).toBe('spine.spawn.result.v1');
+    expect(receipt.results).toHaveLength(2);
+    expect(receipt.results[0]).toMatchObject({ ordinal: 0, outcome: 'completed', memory_body: 'memory A' });
+    expect(receipt.results[1]).toMatchObject({ ordinal: 1, outcome: 'completed', memory_body: 'memory B' });
+
+    // Simulate the receipt landing in contextMemory and assert derive picks it up.
+    ctx.get(IAgentContextMemoryService).append(
+      assistantSpineCall('call_spawn', 'spine_spawn', {
+        tasks: [
+          { summary: 'branch A', prompt: 'do A' },
+          { summary: 'branch B', prompt: 'do B' },
+        ],
+      }),
+      {
+        role: 'tool',
+        content: [{ type: 'text', text: result.receipt! }],
+        toolCallId: 'call_spawn',
+        isError: false,
+      } as ContextMessage,
+    );
+
+    const state = readSpine(ctx);
+    expect(state.nodes['1.1.1']?.summary).toBe('branch A');
+    expect(state.nodes['1.1.1']?.memory).toBe('memory A');
+    expect(state.nodes['1.1.1']?.closedAt).toBeDefined();
+    expect(state.nodes['1.1.2']?.summary).toBe('branch B');
+    expect(state.nodes['1.1.2']?.memory).toBe('memory B');
+    expect(state.nodes['1.1.2']?.closedAt).toBeDefined();
+  });
+});