diff --git a/packages/agent-core-v2/scripts/check-domain-layers.mjs b/packages/agent-core-v2/scripts/check-domain-layers.mjs
index 2a6644c08..16fd40202 100644
--- a/packages/agent-core-v2/scripts/check-domain-layers.mjs
+++ b/packages/agent-core-v2/scripts/check-domain-layers.mjs
@@ -147,7 +147,6 @@ const DOMAIN_LAYER = new Map([
   ['microCompaction', 4],
   ['loop', 4],
   ['media', 4],
-  ['fileTools', 4],
   ['shellTools', 4],
   ['llmRequester', 4],
   ['profile', 4],
diff --git a/packages/agent-core-v2/src/agent/fileTools/index.ts b/packages/agent-core-v2/src/agent/fileTools/index.ts
deleted file mode 100644
index a20558d10..000000000
--- a/packages/agent-core-v2/src/agent/fileTools/index.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * `fileTools` domain barrel — re-exports the built-in file tools (Read / Write
- * / Edit / Grep / Glob) and the shared line-ending helpers. Each tool
- * self-registers via `registerTool(...)` at module load, so importing this
- * barrel is what wires them into every Agent-scope tool registry.
- */
-
-export * from '#/agent/fileTools/tools/edit';
-export * from '#/agent/fileTools/tools/glob';
-export * from '#/agent/fileTools/tools/grep';
-export * from '#/agent/fileTools/tools/line-endings';
-export * from '#/agent/fileTools/tools/read';
-export * from '#/agent/fileTools/tools/write';
diff --git a/packages/agent-core-v2/src/index.ts b/packages/agent-core-v2/src/index.ts
index 902024095..bbd2f4880 100644
--- a/packages/agent-core-v2/src/index.ts
+++ b/packages/agent-core-v2/src/index.ts
@@ -115,5 +115,4 @@ export type { ToolContribution, ToolContributionOptions } from '#/agent/toolRegi
 export * from '#/agent/toolState';
 export * from '#/agent/userTool';
 export * from '#/agent/wireRecord';
-export * from '#/agent/fileTools';
 export * from '#/agent/shellTools';
diff --git a/packages/agent-core-v2/src/os/backends/node-local/index.ts b/packages/agent-core-v2/src/os/backends/node-local/index.ts
index 824202c9f..f8122da60 100644
--- a/packages/agent-core-v2/src/os/backends/node-local/index.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/index.ts
@@ -2,3 +2,4 @@ export * from './hostEnvironmentService';
 export * from './hostFsService';
 export * from './hostProcessService';
 export * from './hostTerminalService';
+export * from './tools/index';
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/edit.md b/packages/agent-core-v2/src/os/backends/node-local/tools/edit.md
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/edit.md
rename to packages/agent-core-v2/src/os/backends/node-local/tools/edit.md
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/edit.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/edit.ts
similarity index 99%
rename from packages/agent-core-v2/src/agent/fileTools/tools/edit.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/edit.ts
index 1cbf11104..bc7d86cc2 100644
--- a/packages/agent-core-v2/src/agent/fileTools/tools/edit.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/edit.ts
@@ -28,7 +28,7 @@ import { literalRulePattern, matchesPathRuleSubject } from '#/_base/tools/suppor
 import type { WorkspaceConfig } from '#/_base/tools/support/workspace';
 import { renderPrompt } from '#/_base/utils/render-prompt';
 import { ISessionAgentFileSystem } from '#/session/agentFs';
-import { IHostEnvironment } from '#/app/hostEnvironment';
+import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { ISessionWorkspaceContext } from '#/session/workspaceContext';
 import { ToolAccesses } from '#/agent/tool';
 import type { BuiltinTool, ExecutableToolResult, ToolExecution } from '#/agent/tool';
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/glob.md b/packages/agent-core-v2/src/os/backends/node-local/tools/glob.md
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/glob.md
rename to packages/agent-core-v2/src/os/backends/node-local/tools/glob.md
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/glob.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/glob.ts
similarity index 99%
rename from packages/agent-core-v2/src/agent/fileTools/tools/glob.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/glob.ts
index 1f1a8c3cf..8e47ac12c 100644
--- a/packages/agent-core-v2/src/agent/fileTools/tools/glob.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/glob.ts
@@ -56,7 +56,7 @@ import {
   runRgOnce,
   shouldRetryRipgrepEagain,
 } from '#/session/agentFs/runRg';
-import { IHostEnvironment } from '#/app/hostEnvironment';
+import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { ISessionWorkspaceContext } from '#/session/workspaceContext';
 import { ISessionProcessRunner } from '#/session/process';
 import { ITelemetryService } from '#/app/telemetry';
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/grep.md b/packages/agent-core-v2/src/os/backends/node-local/tools/grep.md
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/grep.md
rename to packages/agent-core-v2/src/os/backends/node-local/tools/grep.md
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/grep.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/grep.ts
similarity index 99%
rename from packages/agent-core-v2/src/agent/fileTools/tools/grep.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/grep.ts
index 9b811a8c4..a6263ef20 100644
--- a/packages/agent-core-v2/src/agent/fileTools/tools/grep.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/grep.ts
@@ -29,7 +29,7 @@ import { z } from 'zod';
 
 import { ISessionFsService } from '#/session/agentFs';
 import { ErrorCodes, isKimiError } from '#/errors';
-import { IHostEnvironment } from '#/app/hostEnvironment';
+import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { ISessionWorkspaceContext } from '#/session/workspaceContext';
 import { ToolAccesses } from '#/agent/tool';
 import type { BuiltinTool, ExecutableToolResult, ToolExecution } from '#/agent/tool';
diff --git a/packages/agent-core-v2/src/os/backends/node-local/tools/index.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/index.ts
new file mode 100644
index 000000000..c655c0a22
--- /dev/null
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/index.ts
@@ -0,0 +1,6 @@
+export * from './edit';
+export * from './glob';
+export * from './grep';
+export * from './line-endings';
+export * from './read';
+export * from './write';
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/line-endings.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/line-endings.ts
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/line-endings.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/line-endings.ts
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/read.md b/packages/agent-core-v2/src/os/backends/node-local/tools/read.md
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/read.md
rename to packages/agent-core-v2/src/os/backends/node-local/tools/read.md
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/read.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/read.ts
similarity index 99%
rename from packages/agent-core-v2/src/agent/fileTools/tools/read.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/read.ts
index 995d0935a..0b334f1df 100644
--- a/packages/agent-core-v2/src/agent/fileTools/tools/read.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/read.ts
@@ -25,7 +25,7 @@
 import { z } from 'zod';
 
 import { ISessionAgentFileSystem } from '#/session/agentFs';
-import { IHostEnvironment } from '#/app/hostEnvironment';
+import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { ISessionWorkspaceContext } from '#/session/workspaceContext';
 import { ToolAccesses } from '#/agent/tool';
 import type { BuiltinTool, ExecutableToolResult, ToolExecution } from '#/agent/tool';
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/write.md b/packages/agent-core-v2/src/os/backends/node-local/tools/write.md
similarity index 100%
rename from packages/agent-core-v2/src/agent/fileTools/tools/write.md
rename to packages/agent-core-v2/src/os/backends/node-local/tools/write.md
diff --git a/packages/agent-core-v2/src/agent/fileTools/tools/write.ts b/packages/agent-core-v2/src/os/backends/node-local/tools/write.ts
similarity index 99%
rename from packages/agent-core-v2/src/agent/fileTools/tools/write.ts
rename to packages/agent-core-v2/src/os/backends/node-local/tools/write.ts
index a3c7ba824..1224aefc7 100644
--- a/packages/agent-core-v2/src/agent/fileTools/tools/write.ts
+++ b/packages/agent-core-v2/src/os/backends/node-local/tools/write.ts
@@ -21,7 +21,7 @@ import { z } from 'zod';
 
 import { ISessionAgentFileSystem } from '#/session/agentFs';
 import type { AgentFileStat } from '#/session/agentFs';
-import { IHostEnvironment } from '#/app/hostEnvironment';
+import { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { ISessionWorkspaceContext } from '#/session/workspaceContext';
 import { ToolAccesses } from '#/agent/tool';
 import type { BuiltinTool, ExecutableToolResult, ToolExecution } from '#/agent/tool';
diff --git a/packages/agent-core-v2/test/fileTools/edit.test.ts b/packages/agent-core-v2/test/fileTools/edit.test.ts
index b09811db9..39604f305 100644
--- a/packages/agent-core-v2/test/fileTools/edit.test.ts
+++ b/packages/agent-core-v2/test/fileTools/edit.test.ts
@@ -13,8 +13,8 @@ import { describe, expect, it, vi } from 'vitest';
 import { PathSecurityError } from '../../src/_base/tools/policies/path-access';
 import { stubWorkspaceContext } from './stub-workspace-context';
 import type { ISessionAgentFileSystem } from '#/session/agentFs';
-import { type EditInput, EditInputSchema, EditTool } from '#/agent/fileTools/tools/edit';
-import type { IHostEnvironment } from '#/app/hostEnvironment';
+import { type EditInput, EditInputSchema, EditTool } from '#/os/backends/node-local/tools/edit';
+import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import type { ExecutableToolContext, ExecutableToolResult, ToolExecution } from '#/agent/tool';
 
 const signal = new AbortController().signal;
diff --git a/packages/agent-core-v2/test/fileTools/glob.test.ts b/packages/agent-core-v2/test/fileTools/glob.test.ts
index 7f09f985c..a82ef93e2 100644
--- a/packages/agent-core-v2/test/fileTools/glob.test.ts
+++ b/packages/agent-core-v2/test/fileTools/glob.test.ts
@@ -29,8 +29,8 @@ import {
   GlobTool,
   MAX_MATCHES,
   splitCompletePaths,
-} from '#/agent/fileTools/tools/glob';
-import type { IHostEnvironment } from '#/app/hostEnvironment';
+} from '#/os/backends/node-local/tools/glob';
+import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import { probeHostEnvironmentFromNode } from '#/_base/execEnv';
 import { createExecContext } from '#/session/execContext';
 import { SessionProcessRunner } from '#/session/process/processRunnerService';
diff --git a/packages/agent-core-v2/test/fileTools/grep.test.ts b/packages/agent-core-v2/test/fileTools/grep.test.ts
index f3d77184a..e6c474bf6 100644
--- a/packages/agent-core-v2/test/fileTools/grep.test.ts
+++ b/packages/agent-core-v2/test/fileTools/grep.test.ts
@@ -19,8 +19,8 @@ import {
   type GrepInput,
   GrepInputSchema,
   GrepTool,
-} from '#/agent/fileTools/tools/grep';
-import type { IHostEnvironment } from '#/app/hostEnvironment';
+} from '#/os/backends/node-local/tools/grep';
+import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import type { ExecutableToolContext, ExecutableToolResult, ToolExecution } from '#/agent/tool';
 
 const signal = new AbortController().signal;
diff --git a/packages/agent-core-v2/test/fileTools/read.test.ts b/packages/agent-core-v2/test/fileTools/read.test.ts
index f5053bac7..88ebd3cd9 100644
--- a/packages/agent-core-v2/test/fileTools/read.test.ts
+++ b/packages/agent-core-v2/test/fileTools/read.test.ts
@@ -25,8 +25,8 @@ import {
   type ReadInput,
   ReadInputSchema,
   ReadTool,
-} from '#/agent/fileTools/tools/read';
-import type { IHostEnvironment } from '#/app/hostEnvironment';
+} from '#/os/backends/node-local/tools/read';
+import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import type { ExecutableToolContext, ExecutableToolResult, ToolExecution } from '#/agent/tool';
 
 const signal = new AbortController().signal;
diff --git a/packages/agent-core-v2/test/fileTools/write.test.ts b/packages/agent-core-v2/test/fileTools/write.test.ts
index c4d33db3a..f1683e374 100644
--- a/packages/agent-core-v2/test/fileTools/write.test.ts
+++ b/packages/agent-core-v2/test/fileTools/write.test.ts
@@ -17,8 +17,8 @@ import { describe, expect, it, vi } from 'vitest';
 import { PathSecurityError } from '../../src/_base/tools/policies/path-access';
 import type { AgentFileStat, ISessionAgentFileSystem } from '#/session/agentFs';
 import { stubWorkspaceContext } from './stub-workspace-context';
-import { type WriteInput, WriteInputSchema, WriteTool } from '#/agent/fileTools/tools/write';
-import type { IHostEnvironment } from '#/app/hostEnvironment';
+import { type WriteInput, WriteInputSchema, WriteTool } from '#/os/backends/node-local/tools/write';
+import type { IHostEnvironment } from '#/os/interface/hostEnvironment';
 import type { ExecutableToolContext, ExecutableToolResult, ToolExecution } from '#/agent/tool';
 
 const signal = new AbortController().signal;