refactor(plugin): simplify promise tool declarations

packages/core/src/plugin/promise.ts

@@ -1,7 +1,9 @@
 export * as PluginPromise from "./promise"
 
 import { Plugin } from "@opencode-ai/plugin/v2/effect"
+import type { AnyTool, RegisterOptions } from "@opencode-ai/plugin/v2/tool"
 import { Effect, Scope, Stream } from "effect"
+import { Tool } from "../tool/tool"
 
 type HostRegistration = { readonly dispose: Effect.Effect<void> }
 type Registration = { readonly dispose: () => Promise<void> }
@@ -108,7 +110,15 @@ export function fromPromise(plugin: PromisePlugin) {
             reload: () => run(host.skill.reload()),
           },
           tool: {
-            transform: transform(host.tool),
+            transform: (callback) =>
+              register(
+                host.tool.transform((draft) =>
+                  callback({
+                    add: (name: string, tool: AnyTool, options?: RegisterOptions) =>
+                      draft.add(name, fromPromiseTool(tool), options),
+                  }),
+                ),
+              ),
             hook: (name, callback) =>
               register(host.tool.hook(name, (event) => Effect.promise(() => Promise.resolve(callback(event))))),
           },
@@ -125,3 +135,15 @@ export function fromPromise(plugin: PromisePlugin) {
       }),
   })
 }
+
+function fromPromiseTool(tool: AnyTool) {
+  if ("jsonSchema" in tool)
+    return Tool.make({
+      ...tool,
+      execute: (input, context) => Effect.promise(() => tool.execute(input, context)),
+    })
+  return Tool.make({
+    ...tool,
+    execute: (input, context) => Effect.promise(() => tool.execute(input, context)),
+  })
+}

packages/core/test/plugin/promise.test.ts

@@ -1,9 +1,12 @@
 import { describe, expect } from "bun:test"
-import { Effect } from "effect"
+import { Effect, Schema } from "effect"
 import { AgentV2 } from "@opencode-ai/core/agent"
 import { PluginV2 } from "@opencode-ai/core/plugin"
 import { PluginHost } from "@opencode-ai/core/plugin/host"
 import { PluginPromise } from "@opencode-ai/core/plugin/promise"
+import { SessionV2 } from "@opencode-ai/core/session"
+import { SessionMessage } from "@opencode-ai/core/session/message"
+import { ToolRegistry } from "@opencode-ai/core/tool/registry"
 import { Plugin } from "@opencode-ai/plugin/v2"
 import { testEffect } from "../lib/effect"
 import { PluginTestLayer } from "./fixture"
@@ -93,4 +96,38 @@ describe("fromPromise", () => {
       expect(yield* agents.get(AgentV2.ID.make("temp"))).toBeUndefined()
     }),
   )
+
+  it.effect("constructs plain Promise tool declarations in the host", () =>
+    Effect.gen(function* () {
+      const plugins = yield* PluginV2.Service
+      const registry = yield* ToolRegistry.Service
+      const host = yield* PluginHost.make(plugins)
+      const promisePlugin = Plugin.define({
+        id: "promise-tool",
+        setup: async (ctx) => {
+          await ctx.tool.transform((tools) => {
+            tools.add("hello", {
+              description: "Hello",
+              input: Schema.Struct({ name: Schema.String }),
+              output: Schema.String,
+              execute: async ({ name }) => `Hello, ${name}!`,
+            })
+          })
+        },
+      })
+
+      yield* PluginPromise.fromPromise(promisePlugin).effect(host)
+
+      const materialized = yield* registry.materialize()
+      expect(materialized.definitions).toContainEqual(expect.objectContaining({ name: "hello", description: "Hello" }))
+      expect(
+        yield* materialized.settle({
+          sessionID: SessionV2.ID.make("ses_promise_tool"),
+          agent: AgentV2.ID.make("build"),
+          assistantMessageID: SessionMessage.ID.make("msg_promise_tool"),
+          call: { type: "tool-call", id: "call_promise_tool", name: "hello", input: { name: "world" } },
+        }),
+      ).toMatchObject({ result: { type: "text", value: "Hello, world!" } })
+    }),
+  )
 })

packages/docs/plugins.mdx

@@ -271,25 +271,23 @@ handle expected errors inside the callback.
 
 ## Add a tool
 
-Use `Tool.make` with Effect schemas. Promise tools use async executors:
+Pass a plain object with Effect schemas to `tools.add`. Promise tools use async
+executors:
 
 ```ts title=".opencode/plugins/greeting.ts"
 import { Plugin } from "@opencode-ai/plugin/v2"
-import { Tool } from "@opencode-ai/plugin/v2/tool"
 import { Schema } from "effect"
 
-const greeting = Tool.make({
-  description: "Create a greeting",
-  input: Schema.Struct({ name: Schema.String }),
-  output: Schema.String,
-  execute: async ({ name }) => `Hello, ${name}!`,
-})
-
 export default Plugin.define({
   id: "acme.greeting",
   setup: async (ctx) => {
     await ctx.tool.transform((tools) => {
-      tools.add("greeting", greeting)
+      tools.add("greeting", {
+        description: "Create a greeting",
+        input: Schema.Struct({ name: Schema.String }),
+        output: Schema.String,
+        execute: async ({ name }) => `Hello, ${name}!`,
+      })
     })
   },
 })
@@ -305,10 +303,9 @@ letters, digits, underscores, or hyphens. `tools.add` also accepts
   tool instead of exposing it directly.
 
 The executor receives a second context argument containing `sessionID`,
-`agent`, `assistantMessageID`, and `toolCallID`. Use
-`Tool.withPermission(tool, "permission-name")` to assign a permission key.
-Effect plugins import the helper from `@opencode-ai/plugin/v2/effect/tool` and
-return an `Effect` from `execute`.
+`agent`, `assistantMessageID`, and `toolCallID`. Effect plugins import their
+tool contracts from `@opencode-ai/plugin/v2/effect/tool` and return an `Effect`
+from `execute`.
 
 ## Types
 

packages/plugin/src/v2/promise/README.md

@@ -85,20 +85,19 @@ await ctx.session.hook("request", (event) => {
 })
 ```
 
-Promise tools use the same schemas and registration model as Effect tools, with async executors:
+Promise tools use plain object declarations with async executors:
 
 ```ts
 import { Schema } from "effect"
-import { Tool } from "@opencode-ai/plugin/v2/tool"
 
-const echo = Tool.make({
-  description: "Echo text",
-  input: Schema.Struct({ text: Schema.String }),
-  output: Schema.Struct({ text: Schema.String }),
-  execute: async ({ text }) => ({ text }),
+await ctx.tool.transform((tools) => {
+  tools.add("echo", {
+    description: "Echo text",
+    input: Schema.Struct({ text: Schema.String }),
+    output: Schema.Struct({ text: Schema.String }),
+    execute: async ({ text }) => ({ text }),
+  })
 })
-
-await ctx.tool.transform((tools) => tools.add("echo", echo))
 ```
 
 ## Reloading A Domain

packages/plugin/src/v2/promise/index.ts

@@ -1,8 +1,6 @@
 export type { PluginOptions } from "../options.js"
 export * as Plugin from "./plugin.js"
 
-export { Tool } from "./tool.js"
-
 export { Agent } from "@opencode-ai/schema/agent"
 export { Command } from "@opencode-ai/schema/command"
 export { Connection } from "@opencode-ai/schema/connection"

packages/plugin/src/v2/promise/tool.ts

@@ -1,24 +1,16 @@
-export * as Tool from "./tool.js"
-
-import { Tool } from "../effect/tool.js"
+import type { Tool } from "../effect/tool.js"
 import type { Agent } from "@opencode-ai/schema/agent"
 import type { Session } from "@opencode-ai/schema/session"
 import type { SessionMessage } from "@opencode-ai/schema/session-message"
-import { Effect, type JsonSchema, type Schema } from "effect"
+import type { JsonSchema, Schema } from "effect"
 import type { Hooks, Transform } from "./registration.js"
 
 export type Context = Tool.Context
 export type SchemaType<A> = Tool.SchemaType<A>
-export type Definition<Input extends SchemaType<any>, Output extends SchemaType<any>> = Tool.Definition<Input, Output>
-export type AnyTool = Tool.AnyTool
-export const Failure = Tool.Failure
-export type Failure = Tool.Failure
-export const RegistrationError = Tool.RegistrationError
-export type RegistrationError = Tool.RegistrationError
 export type Content = Tool.Content
 export type DynamicOutput = Tool.DynamicOutput
 
-type Config<
+export type Definition<
   Input extends SchemaType<any>,
   Output extends SchemaType<any>,
   Structured extends SchemaType<any> = Output,
@@ -41,32 +33,14 @@ type Config<
   }) => ReadonlyArray<Content>
 }
 
-type DynamicConfig = {
+export type DynamicDefinition = {
   readonly description: string
   readonly jsonSchema: JsonSchema.JsonSchema
   readonly outputSchema?: JsonSchema.JsonSchema
   readonly execute: (input: unknown, context: Context) => Promise<DynamicOutput>
 }
 
-export function make<
-  Input extends SchemaType<any>,
-  Output extends SchemaType<any>,
-  Structured extends SchemaType<any> = Output,
->(config: Config<Input, Output, Structured>): Definition<Input, Structured>
-export function make(config: DynamicConfig): AnyTool
-export function make(config: Config<any, any, any> | DynamicConfig): AnyTool {
-  if ("jsonSchema" in config)
-    return Tool.make({
-      ...config,
-      execute: (input, context) => Effect.promise(() => config.execute(input, context)),
-    })
-  return Tool.make({
-    ...config,
-    execute: (input, context) => Effect.promise(() => config.execute(input, context)),
-  })
-}
-
-export const withPermission = Tool.withPermission
+export type AnyTool = Definition<any, any, any> | DynamicDefinition
 
 export interface ToolExecuteBeforeEvent {
   readonly tool: string
@@ -95,7 +69,12 @@ export interface RegisterOptions {
 }
 
 export interface ToolDraft {
-  add(name: string, tool: AnyTool, options?: RegisterOptions): void
+  add<
+    Input extends SchemaType<any>,
+    Output extends SchemaType<any>,
+    Structured extends SchemaType<any> = Output,
+  >(name: string, tool: Definition<Input, Output, Structured>, options?: RegisterOptions): void
+  add(name: string, tool: DynamicDefinition, options?: RegisterOptions): void
 }
 
 export interface ToolHooks {

packages/plugin/test/contract-identity.test.ts

@@ -36,6 +36,5 @@ test.each([
     "Provider",
     "Reference",
     "Skill",
-    ...(name === "promise" ? ["Tool"] : []),
   ])
 })