test(effect): cover task resume and permissions

Move the task tool body onto named Effect helpers and keep the Promise bridge at the outer init/execute boundaries. This matches the read tool migration shape while preserving the existing SessionPrompt runtime flow.

packages/opencode/src/tool/registry.ts

@@ -33,6 +33,7 @@ import { Effect, Layer, ServiceMap } from "effect"
 import { InstanceState } from "@/effect/instance-state"
 import { makeRuntime } from "@/effect/run-service"
 import { Env } from "../env"
+import { Agent as AgentSvc } from "../agent/agent"
 import { Question } from "../question"
 import { Todo } from "../session/todo"
 import { LSP } from "../lsp"
@@ -68,6 +69,7 @@ export namespace ToolRegistry {
     | Plugin.Service
     | Question.Service
     | Todo.Service
+    | AgentSvc.Service
     | LSP.Service
     | FileTime.Service
     | Instruction.Service
@@ -237,6 +239,7 @@ export namespace ToolRegistry {
       layer.pipe(
         Layer.provide(Config.defaultLayer),
         Layer.provide(Plugin.defaultLayer),
+        Layer.provide(AgentSvc.defaultLayer),
         Layer.provide(Question.defaultLayer),
         Layer.provide(Todo.defaultLayer),
         Layer.provide(LSP.defaultLayer),

packages/opencode/src/tool/task.ts

@@ -1,14 +1,12 @@
 import { Tool } from "./tool"
 import DESCRIPTION from "./task.txt"
 import z from "zod"
+import { Effect } from "effect"
 import { Session } from "../session"
 import { SessionID, MessageID } from "../session/schema"
 import { MessageV2 } from "../session/message-v2"
-import { Identifier } from "../id/id"
 import { Agent } from "../agent/agent"
 import { SessionPrompt } from "../session/prompt"
-import { iife } from "@/util/iife"
-import { defer } from "@/util/defer"
 import { Config } from "../config/config"
 import { Permission } from "@/permission"
 
@@ -25,31 +23,39 @@ const parameters = z.object({
   command: z.string().describe("The command that triggered this task").optional(),
 })
 
-export const TaskTool = Tool.define("task", async (ctx) => {
+export const TaskTool = Tool.defineEffect(
-  const agents = await Agent.list().then((x) => x.filter((a) => a.mode !== "primary"))
+  "task",
+  Effect.gen(function* () {
+    const agent = yield* Agent.Service
+    const config = yield* Config.Service
 
-  // Filter agents by permissions if agent provided
+    const list = Effect.fn("TaskTool.list")(function* (caller?: Tool.InitContext["agent"]) {
-  const caller = ctx?.agent
+      const items = yield* agent.list().pipe(Effect.map((items) => items.filter((item) => item.mode !== "primary")))
-  const accessibleAgents = caller
+      const filtered = caller
-    ? agents.filter((a) => Permission.evaluate("task", a.name, caller.permission).action !== "deny")
+        ? items.filter((item) => Permission.evaluate("task", item.name, caller.permission).action !== "deny")
-    : agents
+        : items
-  const list = accessibleAgents.toSorted((a, b) => a.name.localeCompare(b.name))
+      return filtered.toSorted((a, b) => a.name.localeCompare(b.name))
+    })
 
-  const description = DESCRIPTION.replace(
+    const desc = Effect.fn("TaskTool.desc")(function* (caller?: Tool.InitContext["agent"]) {
+      const items = yield* list(caller)
+      return DESCRIPTION.replace(
         "{agents}",
-    list
+        items
-      .map((a) => `- ${a.name}: ${a.description ?? "This subagent should only be called manually by the user."}`)
+          .map(
+            (item) =>
+              `- ${item.name}: ${item.description ?? "This subagent should only be called manually by the user."}`,
+          )
           .join("\n"),
       )
-  return {
+    })
-    description,
+
-    parameters,
+    const run = Effect.fn("TaskTool.execute")(function* (params: z.infer<typeof parameters>, ctx: Tool.Context) {
-    async execute(params: z.infer<typeof parameters>, ctx) {
+      const cfg = yield* config.get()
-      const config = await Config.get()
 
-      // Skip permission check when user explicitly invoked via @ or command subtask
       if (!ctx.extra?.bypassAgentCheck) {
-        await ctx.ask({
+        yield* Effect.promise(() =>
+          ctx.ask({
             permission: "task",
             patterns: [params.subagent_type],
             always: ["*"],
@@ -57,26 +63,33 @@ export const TaskTool = Tool.define("task", async (ctx) => {
               description: params.description,
               subagent_type: params.subagent_type,
             },
+          }),
+        )
+      }
+
+      const next = yield* agent.get(params.subagent_type)
+      if (!next) {
+        return yield* Effect.fail(new Error(`Unknown agent type: ${params.subagent_type} is not a valid agent type`))
+      }
+
+      const hasTask = next.permission.some((rule) => rule.permission === "task")
+      const hasTodo = next.permission.some((rule) => rule.permission === "todowrite")
+
+      const taskID = params.task_id
+      const session = taskID
+        ? yield* Effect.promise(() => {
+            const id = SessionID.make(taskID)
+            return Session.get(id).catch(() => undefined)
           })
-      }
+        : undefined
-
+      const nextSession =
-      const agent = await Agent.get(params.subagent_type)
+        session ??
-      if (!agent) throw new Error(`Unknown agent type: ${params.subagent_type} is not a valid agent type`)
+        (yield* Effect.promise(() =>
-
+          Session.create({
-      const hasTaskPermission = agent.permission.some((rule) => rule.permission === "task")
-      const hasTodoWritePermission = agent.permission.some((rule) => rule.permission === "todowrite")
-
-      const session = await iife(async () => {
-        if (params.task_id) {
-          const found = await Session.get(SessionID.make(params.task_id)).catch(() => {})
-          if (found) return found
-        }
-
-        return await Session.create({
             parentID: ctx.sessionID,
-          title: params.description + ` (@${agent.name} subagent)`,
+            title: params.description + ` (@${next.name} subagent)`,
             permission: [
-            ...(hasTodoWritePermission
+              ...(hasTodo
                 ? []
                 : [
                     {
@@ -85,7 +98,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
                       action: "deny" as const,
                     },
                   ]),
-            ...(hasTaskPermission
+              ...(hasTask
                 ? []
                 : [
                     {
@@ -94,18 +107,19 @@ export const TaskTool = Tool.define("task", async (ctx) => {
                       action: "deny" as const,
                     },
                   ]),
-            ...(config.experimental?.primary_tools?.map((t) => ({
+              ...(cfg.experimental?.primary_tools?.map((item) => ({
                 pattern: "*",
                 action: "allow" as const,
-              permission: t,
+                permission: item,
               })) ?? []),
             ],
-        })
+          }),
-      })
+        ))
-      const msg = await MessageV2.get({ sessionID: ctx.sessionID, messageID: ctx.messageID })
-      if (msg.info.role !== "assistant") throw new Error("Not an assistant message")
 
-      const model = agent.model ?? {
+      const msg = yield* Effect.sync(() => MessageV2.get({ sessionID: ctx.sessionID, messageID: ctx.messageID }))
+      if (msg.info.role !== "assistant") return yield* Effect.fail(new Error("Not an assistant message"))
+
+      const model = next.model ?? {
         modelID: msg.info.modelID,
         providerID: msg.info.providerID,
       }
@@ -113,7 +127,7 @@ export const TaskTool = Tool.define("task", async (ctx) => {
       ctx.metadata({
         title: params.description,
         metadata: {
-          sessionId: session.id,
+          sessionId: nextSession.id,
           model,
         },
       })
@@ -121,46 +135,64 @@ export const TaskTool = Tool.define("task", async (ctx) => {
       const messageID = MessageID.ascending()
 
       function cancel() {
-        SessionPrompt.cancel(session.id)
+        SessionPrompt.cancel(nextSession.id)
       }
+      return yield* Effect.acquireUseRelease(
+        Effect.sync(() => {
           ctx.abort.addEventListener("abort", cancel)
-      using _ = defer(() => ctx.abort.removeEventListener("abort", cancel))
+        }),
-      const promptParts = await SessionPrompt.resolvePromptParts(params.prompt)
+        () =>
-
+          Effect.gen(function* () {
-      const result = await SessionPrompt.prompt({
+            const parts = yield* Effect.promise(() => SessionPrompt.resolvePromptParts(params.prompt))
+            const result = yield* Effect.promise(() =>
+              SessionPrompt.prompt({
                 messageID,
-        sessionID: session.id,
+                sessionID: nextSession.id,
                 model: {
                   modelID: model.modelID,
                   providerID: model.providerID,
                 },
-        agent: agent.name,
+                agent: next.name,
                 tools: {
-          ...(hasTodoWritePermission ? {} : { todowrite: false }),
+                  ...(hasTodo ? {} : { todowrite: false }),
-          ...(hasTaskPermission ? {} : { task: false }),
+                  ...(hasTask ? {} : { task: false }),
-          ...Object.fromEntries((config.experimental?.primary_tools ?? []).map((t) => [t, false])),
+                  ...Object.fromEntries((cfg.experimental?.primary_tools ?? []).map((item) => [item, false])),
                 },
-        parts: promptParts,
+                parts,
-      })
+              }),
-
+            )
-      const text = result.parts.findLast((x) => x.type === "text")?.text ?? ""
-
-      const output = [
-        `task_id: ${session.id} (for resuming to continue this task if needed)`,
-        "",
-        "<task_result>",
-        text,
-        "</task_result>",
-      ].join("\n")
-
             return {
               title: params.description,
               metadata: {
-          sessionId: session.id,
+                sessionId: nextSession.id,
                 model,
               },
-        output,
+              output: [
+                `task_id: ${nextSession.id} (for resuming to continue this task if needed)`,
+                "",
+                "<task_result>",
+                result.parts.findLast((item) => item.type === "text")?.text ?? "",
+                "</task_result>",
+              ].join("\n"),
             }
+          }),
+        () =>
+          Effect.sync(() => {
+            ctx.abort.removeEventListener("abort", cancel)
+          }),
+      )
+    })
+
+    return async (ctx) => {
+      const description = await Effect.runPromise(desc(ctx?.agent))
+
+      return {
+        description,
+        parameters,
+        async execute(params: z.infer<typeof parameters>, ctx) {
+          return Effect.runPromise(run(params, ctx))
         },
       }
-})
+    }
+  }),
+)

packages/opencode/test/session/prompt-effect.test.ts

@@ -1,5 +1,5 @@
 import { NodeFileSystem } from "@effect/platform-node"
-import { expect, spyOn } from "bun:test"
+import { expect } from "bun:test"
 import { Cause, Effect, Exit, Fiber, Layer } from "effect"
 import path from "path"
 import z from "zod"
@@ -13,7 +13,6 @@ import { MCP } from "../../src/mcp"
 import { Permission } from "../../src/permission"
 import { Plugin } from "../../src/plugin"
 import { Provider as ProviderSvc } from "../../src/provider/provider"
-import type { Provider } from "../../src/provider/provider"
 import { ModelID, ProviderID } from "../../src/provider/schema"
 import { Question } from "../../src/question"
 import { Todo } from "../../src/session/todo"
@@ -29,7 +28,6 @@ import { MessageID, PartID, SessionID } from "../../src/session/schema"
 import { SessionStatus } from "../../src/session/status"
 import { Shell } from "../../src/shell/shell"
 import { Snapshot } from "../../src/snapshot"
-import { TaskTool } from "../../src/tool/task"
 import { ToolRegistry } from "../../src/tool/registry"
 import { Truncate } from "../../src/tool/truncate"
 import { Log } from "../../src/util/log"
@@ -627,11 +625,13 @@ it.live(
   "cancel finalizes subtask tool state",
   () =>
     provideTmpdirInstance(
-      (dir) =>
+      () =>
         Effect.gen(function* () {
           const ready = defer<void>()
           const aborted = defer<void>()
-          const init = spyOn(TaskTool, "init").mockImplementation(async () => ({
+          const registry = yield* ToolRegistry.Service
+          const init = registry.named.task.init
+          registry.named.task.init = async () => ({
             description: "task",
             parameters: z.object({
               description: z.string(),
@@ -641,6 +641,13 @@ it.live(
               command: z.string().optional(),
             }),
             execute: async (_args, ctx) => {
+              ctx.metadata({
+                title: "inspect bug",
+                metadata: {
+                  sessionId: SessionID.make("task"),
+                  model: ref,
+                },
+              })
               ready.resolve()
               ctx.abort.addEventListener("abort", () => aborted.resolve(), { once: true })
               await new Promise<void>(() => {})
@@ -653,8 +660,8 @@ it.live(
                 output: "",
               }
             },
-          }))
+          })
-          yield* Effect.addFinalizer(() => Effect.sync(() => init.mockRestore()))
+          yield* Effect.addFinalizer(() => Effect.sync(() => void (registry.named.task.init = init)))
 
           const { prompt, chat } = yield* boot()
           const msg = yield* user(chat.id, "hello")
@@ -673,11 +680,19 @@ it.live(
           expect(taskMsg?.info.role).toBe("assistant")
           if (!taskMsg || taskMsg.info.role !== "assistant") return
 
-          const tool = toolPart(taskMsg.parts)
+          const tool = errorTool(taskMsg.parts)
-          expect(tool?.type).toBe("tool")
           if (!tool) return
 
-          expect(tool.state.status).not.toBe("running")
+          expect(tool.state.error).toBe("Cancelled")
+          expect(tool.state.input).toEqual({
+            description: "inspect bug",
+            prompt: "look into the cache key path",
+            subagent_type: "general",
+          })
+          expect(tool.state.metadata).toEqual({
+            sessionId: SessionID.make("task"),
+            model: ref,
+          })
           expect(taskMsg.info.time.completed).toBeDefined()
           expect(taskMsg.info.finish).toBeDefined()
         }),

packages/opencode/test/tool/task.test.ts

@@ -1,36 +1,100 @@
-import { afterEach, describe, expect, test } from "bun:test"
+import { afterEach, describe, expect } from "bun:test"
+import { Effect, Layer } from "effect"
 import { Agent } from "../../src/agent/agent"
+import { Config } from "../../src/config/config"
+import * as CrossSpawnSpawner from "../../src/effect/cross-spawn-spawner"
 import { Instance } from "../../src/project/instance"
+import { Session } from "../../src/session"
+import { MessageV2 } from "../../src/session/message-v2"
+import { SessionPrompt } from "../../src/session/prompt"
+import { MessageID, PartID } from "../../src/session/schema"
+import { ModelID, ProviderID } from "../../src/provider/schema"
 import { TaskTool } from "../../src/tool/task"
-import { tmpdir } from "../fixture/fixture"
+import { provideTmpdirInstance } from "../fixture/fixture"
+import { testEffect } from "../lib/effect"
 
 afterEach(async () => {
   await Instance.disposeAll()
 })
 
-describe("tool.task", () => {
+const ref = {
-  test("description sorts subagents by name and is stable across calls", async () => {
+  providerID: ProviderID.make("test"),
-    await using tmp = await tmpdir({
+  modelID: ModelID.make("test-model"),
-      config: {
+}
-        agent: {
-          zebra: {
-            description: "Zebra agent",
-            mode: "subagent",
-          },
-          alpha: {
-            description: "Alpha agent",
-            mode: "subagent",
-          },
-        },
-      },
-    })
 
-    await Instance.provide({
+const it = testEffect(
-      directory: tmp.path,
+  Layer.mergeAll(Agent.defaultLayer, Config.defaultLayer, CrossSpawnSpawner.defaultLayer, Session.defaultLayer),
-      fn: async () => {
+)
-        const build = await Agent.get("build")
+
-        const first = await TaskTool.init({ agent: build })
+const seed = Effect.fn("TaskToolTest.seed")(function* (title = "Pinned") {
-        const second = await TaskTool.init({ agent: build })
+  const session = yield* Session.Service
+  const chat = yield* session.create({ title })
+  const user = yield* session.updateMessage({
+    id: MessageID.ascending(),
+    role: "user",
+    sessionID: chat.id,
+    agent: "build",
+    model: ref,
+    time: { created: Date.now() },
+  })
+  const assistant: MessageV2.Assistant = {
+    id: MessageID.ascending(),
+    role: "assistant",
+    parentID: user.id,
+    sessionID: chat.id,
+    mode: "build",
+    agent: "build",
+    cost: 0,
+    path: { cwd: "/tmp", root: "/tmp" },
+    tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },
+    modelID: ref.modelID,
+    providerID: ref.providerID,
+    time: { created: Date.now() },
+  }
+  yield* session.updateMessage(assistant)
+  return { chat, assistant }
+})
+
+function reply(input: Parameters<typeof SessionPrompt.prompt>[0], text: string): MessageV2.WithParts {
+  const id = MessageID.ascending()
+  return {
+    info: {
+      id,
+      role: "assistant",
+      parentID: input.messageID ?? MessageID.ascending(),
+      sessionID: input.sessionID,
+      mode: input.agent ?? "general",
+      agent: input.agent ?? "general",
+      cost: 0,
+      path: { cwd: "/tmp", root: "/tmp" },
+      tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },
+      modelID: input.model?.modelID ?? ref.modelID,
+      providerID: input.model?.providerID ?? ref.providerID,
+      time: { created: Date.now() },
+      finish: "stop",
+    },
+    parts: [
+      {
+        id: PartID.ascending(),
+        messageID: id,
+        sessionID: input.sessionID,
+        type: "text",
+        text,
+      },
+    ],
+  }
+}
+
+describe("tool.task", () => {
+  it.live("description sorts subagents by name and is stable across calls", () =>
+    provideTmpdirInstance(
+      () =>
+        Effect.gen(function* () {
+          const agent = yield* Agent.Service
+          const build = yield* agent.get("build")
+          const tool = yield* TaskTool
+          const first = yield* Effect.promise(() => tool.init({ agent: build }))
+          const second = yield* Effect.promise(() => tool.init({ agent: build }))
 
           expect(first.description).toBe(second.description)
 
@@ -43,7 +107,161 @@ describe("tool.task", () => {
           expect(explore).toBeGreaterThan(alpha)
           expect(general).toBeGreaterThan(explore)
           expect(zebra).toBeGreaterThan(general)
+        }),
+      {
+        config: {
+          agent: {
+            zebra: {
+              description: "Zebra agent",
+              mode: "subagent",
             },
+            alpha: {
+              description: "Alpha agent",
+              mode: "subagent",
+            },
+          },
+        },
+      },
+    ),
+  )
+
+  it.live("execute resumes an existing task session from task_id", () =>
+    provideTmpdirInstance(() =>
+      Effect.gen(function* () {
+        const sessions = yield* Session.Service
+        const { chat, assistant } = yield* seed()
+        const child = yield* sessions.create({ parentID: chat.id, title: "Existing child" })
+        const tool = yield* TaskTool
+        const def = yield* Effect.promise(() => tool.init())
+        const resolve = SessionPrompt.resolvePromptParts
+        const prompt = SessionPrompt.prompt
+        let seen: Parameters<typeof SessionPrompt.prompt>[0] | undefined
+
+        SessionPrompt.resolvePromptParts = async (template) => [{ type: "text", text: template }]
+        SessionPrompt.prompt = async (input) => {
+          seen = input
+          return reply(input, "resumed")
+        }
+        yield* Effect.addFinalizer(() =>
+          Effect.sync(() => {
+            SessionPrompt.resolvePromptParts = resolve
+            SessionPrompt.prompt = prompt
+          }),
+        )
+
+        const result = yield* Effect.promise(() =>
+          def.execute(
+            {
+              description: "inspect bug",
+              prompt: "look into the cache key path",
+              subagent_type: "general",
+              task_id: child.id,
+            },
+            {
+              sessionID: chat.id,
+              messageID: assistant.id,
+              agent: "build",
+              abort: new AbortController().signal,
+              messages: [],
+              metadata() {},
+              ask: async () => {},
+            },
+          ),
+        )
+
+        const kids = yield* sessions.children(chat.id)
+        expect(kids).toHaveLength(1)
+        expect(kids[0]?.id).toBe(child.id)
+        expect(result.metadata.sessionId).toBe(child.id)
+        expect(result.output).toContain(`task_id: ${child.id}`)
+        expect(seen?.sessionID).toBe(child.id)
+      }),
+    ),
+  )
+
+  it.live("execute shapes child permissions for task, todowrite, and primary tools", () =>
+    provideTmpdirInstance(
+      () =>
+        Effect.gen(function* () {
+          const sessions = yield* Session.Service
+          const { chat, assistant } = yield* seed()
+          const tool = yield* TaskTool
+          const def = yield* Effect.promise(() => tool.init())
+          const resolve = SessionPrompt.resolvePromptParts
+          const prompt = SessionPrompt.prompt
+          let seen: Parameters<typeof SessionPrompt.prompt>[0] | undefined
+
+          SessionPrompt.resolvePromptParts = async (template) => [{ type: "text", text: template }]
+          SessionPrompt.prompt = async (input) => {
+            seen = input
+            return reply(input, "done")
+          }
+          yield* Effect.addFinalizer(() =>
+            Effect.sync(() => {
+              SessionPrompt.resolvePromptParts = resolve
+              SessionPrompt.prompt = prompt
+            }),
+          )
+
+          const result = yield* Effect.promise(() =>
+            def.execute(
+              {
+                description: "inspect bug",
+                prompt: "look into the cache key path",
+                subagent_type: "reviewer",
+              },
+              {
+                sessionID: chat.id,
+                messageID: assistant.id,
+                agent: "build",
+                abort: new AbortController().signal,
+                messages: [],
+                metadata() {},
+                ask: async () => {},
+              },
+            ),
+          )
+
+          const child = yield* sessions.get(result.metadata.sessionId)
+          expect(child.parentID).toBe(chat.id)
+          expect(child.permission).toEqual([
+            {
+              permission: "todowrite",
+              pattern: "*",
+              action: "deny",
+            },
+            {
+              permission: "bash",
+              pattern: "*",
+              action: "allow",
+            },
+            {
+              permission: "read",
+              pattern: "*",
+              action: "allow",
+            },
+          ])
+          expect(seen?.tools).toEqual({
+            todowrite: false,
+            bash: false,
+            read: false,
           })
-  })
+        }),
+      {
+        config: {
+          agent: {
+            reviewer: {
+              mode: "subagent",
+              permission: {
+                task: "allow",
+              },
+            },
+          },
+          experimental: {
+            primary_tools: ["bash", "read"],
+          },
+        },
+      },
+    ),
+  )
 })