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task.ts
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import * as Tool from "./tool"
import DESCRIPTION from "./task.txt"
import { ToolJsonSchema } from "./json-schema"
import { BackgroundJob } from "@/background/job"
import { Bus } from "@/bus"
import { Session } from "@/session/session"
import { SessionID, MessageID } from "../session/schema"
import { MessageV2 } from "../session/message-v2"
import { Agent } from "../agent/agent"
import { deriveSubagentSessionPermission } from "../agent/subagent-permissions"
import type { SessionPrompt } from "../session/prompt"
import { SessionStatus } from "@/session/status"
import { Config } from "@/config/config"
import { TuiEvent } from "@/cli/cmd/tui/event"
import { Cause, Effect, Exit, Option, Schema, Scope } from "effect"
import { EffectBridge } from "@/effect/bridge"
import { RuntimeFlags } from "@/effect/runtime-flags"
export interface TaskPromptOps {
cancel(sessionID: SessionID): Effect.Effect<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>
}
const id = "task"
const BACKGROUND_DESCRIPTION = [
"",
"",
[
"Background mode: background=true launches the subagent asynchronously.",
"Use task_status(task_id=..., wait=false) to poll, or wait=true to block until done.",
].join(" "),
].join("\n")
const BaseParameters = 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({
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" }),
})
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({
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 background = yield* BackgroundJob.Service
const bus = yield* Bus.Service
const config = yield* Config.Service
const sessions = yield* Session.Service
const scope = yield* Scope.Scope
const status = yield* SessionStatus.Service
const flags = yield* RuntimeFlags.Service
const run = Effect.fn("TaskTool.execute")(function* (
params: Schema.Schema.Type<typeof Parameters>,
ctx: Tool.Context,
) {
const cfg = yield* config.get()
const runInBackground = params.background === true
if (runInBackground && !flags.experimentalBackgroundSubagents) {
return yield* Effect.fail(
new Error("Background subagents require OPENCODE_EXPERIMENTAL_BACKGROUND_SUBAGENTS=true"),
)
}
if (!ctx.extra?.bypassAgentCheck) {
yield* ctx.ask({
permission: id,
patterns: [params.subagent_type],
always: ["*"],
metadata: {
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: ${params.subagent_type} is not a valid agent type`))
}
const taskID = params.task_id
const session = taskID
? yield* sessions.get(SessionID.make(taskID)).pipe(Effect.catchCause(() => Effect.succeed(undefined)))
: undefined
const parent = yield* sessions.get(ctx.sessionID)
const parentAgent = parent.agent
? yield* agent.get(parent.agent).pipe(Effect.catchCause(() => Effect.succeed(undefined)))
: undefined
const nextSession =
session ??
(yield* sessions.create({
parentID: ctx.sessionID,
title: params.description + ` (@${next.name} subagent)`,
permission: [
...deriveSubagentSessionPermission({
parentSessionPermission: parent.permission ?? [],
parentAgent,
subagent: next,
}),
...(cfg.experimental?.primary_tools?.map((item) => ({
pattern: "*",
action: "allow" as const,
permission: item,
})) ?? []),
],
}))
const msg = yield* MessageV2.get({ sessionID: ctx.sessionID, messageID: ctx.messageID }).pipe(Effect.orDie)
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,
}
const metadata = {
parentSessionId: ctx.sessionID,
sessionId: nextSession.id,
model,
...(runInBackground ? { background: true } : {}),
}
yield* ctx.metadata({
title: params.description,
metadata,
})
const ops = ctx.extra?.promptOps as TaskPromptOps
if (!ops) return yield* Effect.fail(new Error("TaskTool requires promptOps in ctx.extra"))
const runCancel = yield* EffectBridge.make()
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: {
...(next.permission.some((rule) => rule.permission === "todowrite") ? {} : { todowrite: false }),
...(next.permission.some((rule) => rule.permission === id) ? {} : { task: false }),
...Object.fromEntries((cfg.experimental?.primary_tools ?? []).map((item) => [item, false])),
},
parts,
})
return result.parts.findLast((item) => item.type === "text")?.text ?? ""
})
const resumeWhenIdle: (input: { userID: MessageID; state: "completed" | "error" }) => Effect.Effect<void> =
Effect.fn("TaskTool.resumeWhenIdle")(function* (input: { userID: MessageID; state: "completed" | "error" }) {
const latest = yield* sessions
.findMessage(ctx.sessionID, (item) => item.info.role === "user")
.pipe(Effect.orDie)
if (Option.isNone(latest)) return
if (latest.value.info.id !== input.userID) return
if ((yield* status.get(ctx.sessionID)).type !== "idle") {
yield* Effect.sleep("300 millis")
return yield* resumeWhenIdle(input)
}
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, Effect.forkIn(scope, { startImmediately: true }))
})
const continueIfIdle = Effect.fn("TaskTool.continueIfIdle")(function* (input: {
userID: MessageID
state: "completed" | "error"
}) {
yield* resumeWhenIdle(input).pipe(Effect.ignore, Effect.forkIn(scope, { startImmediately: true }))
})
const inject = Effect.fn("TaskTool.injectBackgroundResult")(function* (
state: "completed" | "error",
text: string,
) {
const currentParent = yield* sessions.get(ctx.sessionID)
const message = yield* ops.prompt({
sessionID: ctx.sessionID,
noReply: true,
agent: currentParent.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 })
})
const existing = yield* background.get(nextSession.id)
if (existing?.status === "running") {
return yield* Effect.fail(
new Error(`Task ${nextSession.id} is already running. Use task_status to check progress.`),
)
}
if (runInBackground) {
const info = yield* background.start({
id: nextSession.id,
type: id,
title: params.description,
metadata,
run: runTask().pipe(
Effect.tap((text) => inject("completed", text).pipe(Effect.ignore)),
Effect.catchCause((cause) =>
(Cause.hasInterruptsOnly(cause)
? Effect.void
: inject("error", errorText(Cause.squash(cause))).pipe(Effect.ignore)
).pipe(Effect.andThen(Effect.failCause(cause))),
),
),
})
return {
title: params.description,
metadata: {
...metadata,
jobId: info.id,
},
output: backgroundOutput(nextSession.id),
}
}
const cancel = ops.cancel(nextSession.id)
function onAbort() {
runCancel.fork(cancel)
}
return yield* Effect.acquireUseRelease(
Effect.sync(() => {
ctx.abort.addEventListener("abort", onAbort)
}),
() =>
Effect.gen(function* () {
const text = yield* runTask()
return {
title: params.description,
metadata,
output: output(nextSession.id, text),
}
}),
(_, exit) =>
Effect.gen(function* () {
if (Exit.hasInterrupts(exit)) yield* cancel
}).pipe(
Effect.ensuring(
Effect.sync(() => {
ctx.abort.removeEventListener("abort", onAbort)
}),
),
),
)
})
return {
description: flags.experimentalBackgroundSubagents ? DESCRIPTION + BACKGROUND_DESCRIPTION : DESCRIPTION,
parameters: Parameters,
jsonSchema: flags.experimentalBackgroundSubagents ? undefined : ToolJsonSchema.fromSchema(BaseParameters),
execute: (params: Schema.Schema.Type<typeof Parameters>, ctx: Tool.Context) =>
run(params, ctx).pipe(Effect.orDie),
}
}),
)