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Apply PR #24174: feat(core): add background subagent support

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This commit is contained in:
opencode-agent[bot]
2026-04-27 21:00:30 +00:00
parent 04e06e2dfd 80aeb78b38
commit 4326dc1a3b
12 changed files with 809 additions and 61 deletions
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packages/opencode/src/cli/cmd/tui/routes/session/index.tsx
+3 -1
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@@ -2002,7 +2002,9 @@ function Task(props: ToolProps<typeof TaskTool>) {
const content = createMemo(() => {
if (!props.input.description) return ""
let content = [`${Locale.titlecase(props.input.subagent_type ?? "General")} Task — ${props.input.description}`]
const description =
props.metadata.background === true ? `${props.input.description} (background)` : props.input.description
let content = [`${Locale.titlecase(props.input.subagent_type ?? "General")} Task — ${description}`]
if (isRunning() && tools().length > 0) {
// content[0] += ` · ${tools().length} toolcalls`
packages/opencode/src/session/prompt.ts
+4
View File
@@ -118,6 +118,10 @@ export const layer = Layer.effect(
cancel: (sessionID: SessionID) => run.fork(cancel(sessionID)),
resolvePromptParts: (template: string) => resolvePromptParts(template),
prompt: (input: PromptInput) => prompt(input),
loop: (input: LoopInput) => loop(input),
fork: (effect: Effect.Effect<void, never, never>) => {
run.fork(effect)
},
} satisfies TaskPromptOps
})
packages/opencode/src/tool/registry.ts
+7
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@@ -7,6 +7,7 @@ import { GlobTool } from "./glob"
import { GrepTool } from "./grep"
import { ReadTool } from "./read"
import { TaskTool } from "./task"
import { TaskStatusTool } from "./task_status"
import { TodoWriteTool } from "./todo"
import { WebFetchTool } from "./webfetch"
import { WriteTool } from "./write"
@@ -50,6 +51,7 @@ import { Agent } from "../agent/agent"
import { Git } from "@/git"
import { Skill } from "../skill"
import { Permission } from "@/permission"
import { SessionStatus } from "@/session/status"
const log = Log.create({ service: "tool.registry" })
@@ -82,6 +84,7 @@ export const layer: Layer.Layer<
| Agent.Service
| Skill.Service
| Session.Service
| SessionStatus.Service
| Provider.Service
| Git.Service
| LSP.Service
@@ -121,6 +124,7 @@ export const layer: Layer.Layer<
const greptool = yield* GrepTool
const patchtool = yield* ApplyPatchTool
const skilltool = yield* SkillTool
const taskstatus = yield* TaskStatusTool
const agent = yield* Agent.Service
const state = yield* InstanceState.make<State>(
@@ -201,6 +205,7 @@ export const layer: Layer.Layer<
edit: Tool.init(edit),
write: Tool.init(writetool),
task: Tool.init(task),
taskstatus: Tool.init(taskstatus),
fetch: Tool.init(webfetch),
todo: Tool.init(todo),
search: Tool.init(websearch),
@@ -226,6 +231,7 @@ export const layer: Layer.Layer<
tool.edit,
tool.write,
tool.task,
tool.taskstatus,
tool.fetch,
tool.todo,
tool.search,
@@ -345,6 +351,7 @@ export const defaultLayer = Layer.suspend(() =>
Layer.provide(Skill.defaultLayer),
Layer.provide(Agent.defaultLayer),
Layer.provide(Session.defaultLayer),
Layer.provide(SessionStatus.defaultLayer),
Layer.provide(Provider.defaultLayer),
Layer.provide(Git.defaultLayer),
Layer.provide(LSP.defaultLayer),
packages/opencode/src/tool/task.ts
+151 -43
View File
@@ -2,17 +2,22 @@ import * as Tool from "./tool"
import DESCRIPTION from "./task.txt"
import { Session } from "@/session/session"
import { ShellToolID } from "./shell/id"
import { Bus } from "../bus"
import { SessionID, MessageID } from "../session/schema"
import { MessageV2 } from "../session/message-v2"
import { Agent } from "../agent/agent"
import type { SessionPrompt } from "../session/prompt"
import { Config } from "@/config/config"
import { Effect, Schema } from "effect"
import { SessionStatus } from "../session/status"
import { TuiEvent } from "@/cli/cmd/tui/event"
import { Cause, Effect, Option, Schema } from "effect"
export interface TaskPromptOps {
cancel(sessionID: SessionID): void
resolvePromptParts(template: string): Effect.Effect<SessionPrompt.PromptInput["parts"]>
prompt(input: SessionPrompt.PromptInput): Effect.Effect<MessageV2.WithParts>
loop(input: SessionPrompt.LoopInput): Effect.Effect<MessageV2.WithParts>
fork(effect: Effect.Effect<void, never, never>): void
}
const id = "task"
@@ -21,24 +26,65 @@ export const Parameters = Schema.Struct({
description: Schema.String.annotate({ description: "A short (3-5 words) description of the task" }),
prompt: Schema.String.annotate({ description: "The task for the agent to perform" }),
subagent_type: Schema.String.annotate({ description: "The type of specialized agent to use for this task" }),
task_id: Schema.optional(Schema.String).annotate({
task_id: Schema.optional(SessionID).annotate({
description:
"This should only be set if you mean to resume a previous task (you can pass a prior task_id and the task will continue the same subagent session as before instead of creating a fresh one)",
}),
command: Schema.optional(Schema.String).annotate({ description: "The command that triggered this task" }),
background: Schema.optional(Schema.Boolean).annotate({
description: "When true, launch the subagent in the background and return immediately",
}),
})
function output(sessionID: SessionID, text: string) {
return [
`task_id: ${sessionID} (for resuming to continue this task if needed)`,
"",
"<task_result>",
text,
"</task_result>",
].join("\n")
}
function backgroundOutput(sessionID: SessionID) {
return [
`task_id: ${sessionID} (for polling this task with task_status)`,
"state: running",
"",
"<task_result>",
"Background task started. Continue your current work and call task_status when you need the result.",
"</task_result>",
].join("\n")
}
function backgroundMessage(input: { sessionID: SessionID; description: string; state: "completed" | "error"; text: string }) {
const tag = input.state === "completed" ? "task_result" : "task_error"
const title =
input.state === "completed"
? `Background task completed: ${input.description}`
: `Background task failed: ${input.description}`
return [title, `task_id: ${input.sessionID}`, `state: ${input.state}`, `<${tag}>`, input.text, `</${tag}>`].join(
"\n",
)
}
function errorText(error: unknown) {
if (error instanceof Error) return error.message
return String(error)
}
export const TaskTool = Tool.define(
id,
Effect.gen(function* () {
const agent = yield* Agent.Service
const bus = yield* Bus.Service
const config = yield* Config.Service
const sessions = yield* Session.Service
const status = yield* SessionStatus.Service
const run = Effect.fn("TaskTool.execute")(function* (
params: Schema.Schema.Type<typeof Parameters>,
ctx: Tool.Context,
) {
const run = Effect.fn(
"TaskTool.execute",
)(function* (params: Schema.Schema.Type<typeof Parameters>, ctx: Tool.Context) {
const cfg = yield* config.get()
const primaryTools = (cfg.experimental?.primary_tools ?? []).map(ShellToolID.normalize)
@@ -64,7 +110,7 @@ export const TaskTool = Tool.define(
const taskID = params.task_id
const session = taskID
? yield* sessions.get(SessionID.make(taskID)).pipe(Effect.catchCause(() => Effect.succeed(undefined)))
? yield* sessions.get(taskID).pipe(Effect.catchCause(() => Effect.succeed(undefined)))
: undefined
const nextSession =
session ??
@@ -105,19 +151,107 @@ export const TaskTool = Tool.define(
modelID: msg.info.modelID,
providerID: msg.info.providerID,
}
const parentModel = {
modelID: msg.info.modelID,
providerID: msg.info.providerID,
}
const background = params.background === true
const metadata = {
sessionId: nextSession.id,
model,
...(background ? { background: true } : {}),
}
yield* ctx.metadata({
title: params.description,
metadata: {
sessionId: nextSession.id,
model,
},
metadata,
})
const ops = ctx.extra?.promptOps as TaskPromptOps
if (!ops) return yield* Effect.fail(new Error("TaskTool requires promptOps in ctx.extra"))
const messageID = MessageID.ascending()
const runTask = Effect.fn("TaskTool.runTask")(function* () {
const parts = yield* ops.resolvePromptParts(params.prompt)
const result = yield* ops.prompt({
messageID: MessageID.ascending(),
sessionID: nextSession.id,
model: {
modelID: model.modelID,
providerID: model.providerID,
},
agent: next.name,
tools: {
...(canTodo ? {} : { todowrite: false }),
...(canTask ? {} : { task: false }),
...Object.fromEntries((cfg.experimental?.primary_tools ?? []).map((item) => [item, false])),
},
parts,
})
return result.parts.findLast((item) => item.type === "text")?.text ?? ""
})
const continueIfIdle = Effect.fn("TaskTool.continueIfIdle")(function* (input: {
userID: MessageID
state: "completed" | "error"
}) {
if ((yield* status.get(ctx.sessionID)).type !== "idle") return
const latest = yield* sessions.findMessage(ctx.sessionID, (item) => item.info.role === "user")
if (Option.isNone(latest)) return
if (latest.value.info.id !== input.userID) return
yield* bus.publish(TuiEvent.ToastShow, {
title: input.state === "completed" ? "Background task complete" : "Background task failed",
message:
input.state === "completed"
? `Background task \"${params.description}\" finished. Resuming the main thread.`
: `Background task \"${params.description}\" failed. Resuming the main thread.`,
variant: input.state === "completed" ? "success" : "error",
duration: 5000,
})
yield* ops.loop({ sessionID: ctx.sessionID }).pipe(Effect.ignore)
})
if (background) {
const inject = Effect.fn("TaskTool.injectBackgroundResult")(function* (state: "completed" | "error", text: string) {
const message = yield* ops.prompt({
sessionID: ctx.sessionID,
noReply: true,
model: parentModel,
agent: ctx.agent,
parts: [
{
type: "text",
synthetic: true,
text: backgroundMessage({
sessionID: nextSession.id,
description: params.description,
state,
text,
}),
},
],
})
yield* continueIfIdle({ userID: message.info.id, state })
})
ops.fork(
runTask().pipe(
Effect.matchCauseEffect({
onSuccess: (text) => inject("completed", text),
onFailure: (cause) =>
inject("error", errorText(Cause.squash(cause))).pipe(Effect.catchCause(() => Effect.void)),
}),
Effect.catchCause(() => Effect.void),
Effect.asVoid,
),
)
return {
title: params.description,
metadata,
output: backgroundOutput(nextSession.id),
}
}
function cancel() {
ops.cancel(nextSession.id)
@@ -129,36 +263,11 @@ export const TaskTool = Tool.define(
}),
() =>
Effect.gen(function* () {
const parts = yield* ops.resolvePromptParts(params.prompt)
const result = yield* ops.prompt({
messageID,
sessionID: nextSession.id,
model: {
modelID: model.modelID,
providerID: model.providerID,
},
agent: next.name,
tools: {
...(canTodo ? {} : { todowrite: false }),
...(canTask ? {} : { task: false }),
...Object.fromEntries(primaryTools.map((item) => [item, false])),
},
parts,
})
const text = yield* runTask()
return {
title: params.description,
metadata: {
sessionId: nextSession.id,
model,
},
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"),
metadata,
output: output(nextSession.id, text),
}
}),
() =>
@@ -166,13 +275,12 @@ export const TaskTool = Tool.define(
ctx.abort.removeEventListener("abort", cancel)
}),
)
})
}, Effect.orDie)
return {
description: DESCRIPTION,
parameters: Parameters,
execute: (params: Schema.Schema.Type<typeof Parameters>, ctx: Tool.Context) =>
run(params, ctx).pipe(Effect.orDie),
execute: run,
}
}),
)
packages/opencode/src/tool/task.txt
+7 -5
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@@ -14,11 +14,13 @@ When NOT to use the Task tool:
Usage notes:
1. Launch multiple agents concurrently whenever possible, to maximize performance; to do that, use a single message with multiple tool uses
2. When the agent is done, it will return a single message back to you. The result returned by the agent is not visible to the user. To show the user the result, you should send a text message back to the user with a concise summary of the result. The output includes a task_id you can reuse later to continue the same subagent session.
3. Each agent invocation starts with a fresh context unless you provide task_id to resume the same subagent session (which continues with its previous messages and tool outputs). When starting fresh, your prompt should contain a highly detailed task description for the agent to perform autonomously and you should specify exactly what information the agent should return back to you in its final and only message to you.
4. The agent's outputs should generally be trusted
5. Clearly tell the agent whether you expect it to write code or just to do research (search, file reads, web fetches, etc.), since it is not aware of the user's intent. Tell it how to verify its work if possible (e.g., relevant test commands).
6. If the agent description mentions that it should be used proactively, then you should try your best to use it without the user having to ask for it first. Use your judgement.
2. By default, task waits for completion and returns the result immediately, along with a task_id you can reuse later to continue the same subagent session.
3. Set background=true to launch asynchronously. In background mode, continue your current work without waiting.
4. For background runs, use task_status(task_id=..., wait=false) to poll, or wait=true to block until done (optionally with timeout_ms).
5. Each agent invocation starts with a fresh context unless you provide task_id to resume the same subagent session (which continues with its previous messages and tool outputs). When starting fresh, your prompt should contain a highly detailed task description for the agent to perform autonomously and you should specify exactly what information the agent should return back to you in its final and only message to you.
6. The agent's outputs should generally be trusted
7. Clearly tell the agent whether you expect it to write code or just to do research (search, file reads, web fetches, etc.), since it is not aware of the user's intent. Tell it how to verify its work if possible (e.g., relevant test commands).
8. If the agent description mentions that it should be used proactively, then you should try your best to use it without the user having to ask for it first. Use your judgement.
Example usage (NOTE: The agents below are fictional examples for illustration only - use the actual agents listed above):
packages/opencode/src/tool/task_status.ts
+152
View File
@@ -0,0 +1,152 @@
import * as Tool from "./tool"
import DESCRIPTION from "./task_status.txt"
import { Session } from "@/session/session"
import { SessionID } from "../session/schema"
import { MessageV2 } from "../session/message-v2"
import { SessionStatus } from "../session/status"
import { PositiveInt } from "@/util/schema"
import { Effect, Option, Schema } from "effect"
const DEFAULT_TIMEOUT = 60_000
const POLL_MS = 300
const Parameters = Schema.Struct({
task_id: SessionID.annotate({ description: "The task_id returned by the task tool" }),
wait: Schema.optional(Schema.Boolean).annotate({ description: "When true, wait until the task reaches a terminal state or timeout" }),
timeout_ms: Schema.optional(PositiveInt).annotate({
description: "Maximum milliseconds to wait when wait=true (default: 60000)",
}),
})
type State = "running" | "completed" | "error"
type InspectResult = { state: State; text: string }
function format(input: { taskID: SessionID; state: State; text: string }) {
return [`task_id: ${input.taskID}`, `state: ${input.state}`, "", "<task_result>", input.text, "</task_result>"].join(
"\n",
)
}
function errorText(error: NonNullable<MessageV2.Assistant["error"]>) {
const data = Reflect.get(error, "data")
const message = data && typeof data === "object" ? Reflect.get(data, "message") : undefined
if (typeof message === "string" && message) return message
return error.name
}
export const TaskStatusTool = Tool.define(
"task_status",
Effect.gen(function* () {
const sessions = yield* Session.Service
const status = yield* SessionStatus.Service
const inspect: (taskID: SessionID) => Effect.Effect<InspectResult> = Effect.fn("TaskStatusTool.inspect")(function* (
taskID: SessionID,
) {
const current = yield* status.get(taskID)
if (current.type === "busy" || current.type === "retry") {
return {
state: "running" as const,
text: current.type === "retry" ? `Task is retrying: ${current.message}` : "Task is still running.",
}
}
const latestAssistant = yield* sessions.findMessage(taskID, (item) => item.info.role === "assistant")
if (Option.isNone(latestAssistant)) {
return {
state: "running" as const,
text: "Task has started but has not produced output yet.",
}
}
if (latestAssistant.value.info.role !== "assistant") {
return {
state: "running" as const,
text: "Task has started but has not produced output yet.",
}
}
const latestUser = yield* sessions.findMessage(taskID, (item) => item.info.role === "user")
if (
Option.isSome(latestUser) &&
latestUser.value.info.role === "user" &&
latestUser.value.info.id > latestAssistant.value.info.id
) {
return {
state: "running" as const,
text: "Task is starting.",
}
}
const text = latestAssistant.value.parts.findLast((part) => part.type === "text")?.text ?? ""
if (latestAssistant.value.info.error) {
return {
state: "error" as const,
text: text || errorText(latestAssistant.value.info.error),
}
}
const done =
!!latestAssistant.value.info.finish && !["tool-calls", "unknown"].includes(latestAssistant.value.info.finish)
if (done) {
return {
state: "completed" as const,
text,
}
}
return {
state: "running" as const,
text: text || "Task is still running.",
}
})
const waitForTerminal: (
taskID: SessionID,
timeout: number,
) => Effect.Effect<{ result: InspectResult; timedOut: boolean }> = Effect.fn(
"TaskStatusTool.waitForTerminal",
)(function* (taskID: SessionID, timeout: number) {
const result = yield* inspect(taskID)
if (result.state !== "running") return { result, timedOut: false }
if (timeout <= 0) return { result, timedOut: true }
const sleep = Math.min(POLL_MS, timeout)
yield* Effect.sleep(sleep)
return yield* waitForTerminal(taskID, timeout - sleep)
})
const run = Effect.fn(
"TaskStatusTool.execute",
)(function* (params: Schema.Schema.Type<typeof Parameters>, _ctx: Tool.Context) {
yield* sessions.get(params.task_id)
const waited =
params.wait === true
? yield* waitForTerminal(params.task_id, params.timeout_ms ?? DEFAULT_TIMEOUT)
: { result: yield* inspect(params.task_id), timedOut: false }
const outputText = waited.timedOut
? `Timed out after ${params.timeout_ms ?? DEFAULT_TIMEOUT}ms while waiting for task completion.`
: waited.result.text
return {
title: "Task status",
metadata: {
task_id: params.task_id,
state: waited.result.state,
timed_out: waited.timedOut,
},
output: format({
taskID: params.task_id,
state: waited.result.state,
text: outputText,
}),
}
}, Effect.orDie)
return {
description: DESCRIPTION,
parameters: Parameters,
execute: run,
}
}),
)
packages/opencode/src/tool/task_status.txt
+13
View File
@@ -0,0 +1,13 @@
Poll the status of a subagent task launched with the task tool.
Use this to check background tasks started with `task(background=true)`.
Parameters:
- `task_id` (required): the task session id returned by the task tool
- `wait` (optional): when true, wait for completion
- `timeout_ms` (optional): max wait duration in milliseconds when `wait=true`
Returns compact, parseable output:
- `task_id`
- `state` (`running`, `completed`, or `error`)
- `<task_result>...</task_result>` containing final output, error summary, or current progress text