12 KiB
12 KiB
后台任务运行时
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长时间运行的生产方、ctx.tasks 与任务控制命令共用的类型。运行时 Agent Note负责设计；本页记录 packages/tasks/tasks/src/types.ts 中的确切字段和变体。
ID 与状态
TaskId 是按 <kind>-N 生成的品牌化 id。访问控制依赖拥有者授权，而非 id 的保密性。TaskKind 派生自可合并扩展的 map；注册表将各个 kind 视为不透明的 id 命名空间。
/**
* Producer-defined task kinds. Plugins extend this map by declaration merging;
* the registry treats every value as an opaque id namespace.
*/
interface TaskKindMap {
bash: 'bash'
subagent: 'subagent'
}
TaskStatus 为 'running' | 'stopping' | 'completed' | 'killed' | 'failed'；生产方特有的事实归入 TaskSnapshot.detail。
生产方约定
TaskStart 声明身份和启动器。运行时会在调用 run() 前完成预检，随后提交注册，不再执行可能失败的步骤。生产方拥有执行资源；运行时拥有身份、访问权限和生命周期状态。
/**
* Producer declaration passed to {@link TaskService.start}. The runtime
* preflights access and cleanup before invoking {@link run}; the producer owns
* execution resources while the runtime owns identity and lifecycle state.
*/
interface TaskStart {
/** Producer kind — also the id prefix (`bash`, `subagent`, …). */
kind: TaskKind
/** One-line model-facing label (the command; the delegation description). */
label: string
/**
* Optional UTF-8 byte cap for each complete model-facing completion notice or
* output read, including control-surface status metadata.
*/
outputLimitBytes?: number
/**
* Owning live agent. Access is fenced by its session id, and agent disposal
* cancels and awaits the task. The instance must be the one currently
* registered under its agent id. Omitting the owner creates an unowned task,
* open to any caller until service disposal.
*/
owner?: Agent
/**
* Start the work after preflight and synchronously return its hooks. Called
* once; a throw leaves nothing registered, and the producer must clean up any
* partially started resources.
*/
run(): TaskHooks
}
TaskHooks.done 会在生产方释放其资源后 resolve，而不是仅在工作完成时 resolve。可选的 readOutput 用来区分会消费输出的流式任务和仅有最终输出的任务。
/** Hooks through which the runtime controls and observes producer work. */
interface TaskHooks {
/**
* Request termination. Must be synchronous, idempotent, and eventually settle
* {@link done}; throws propagate. The optional reason is forwarded verbatim.
*/
cancel(reason?: string): void
/**
* Resolves after the producer releases its resources, not merely when work
* finishes. Must not reject; the runtime converts a rejection to `failed`.
* If teardown cancellation throws, the runtime may force-fail only the
* registry record without claiming that the work stopped.
*/
done: Promise<TaskOutcome>
/**
* Consume output produced since the previous call. The producer formats
* truncation and spill notices. Absence marks a final-output-only task; each
* task has one consuming cursor.
*/
readOutput?(): string
}
/** Terminal result supplied by a producer through {@link TaskHooks.done}. */
interface TaskOutcome {
/** How the task ended: finished (`completed`), cancelled (`killed`), or broke (`failed`). */
status: 'completed' | 'killed' | 'failed'
/** Kind-specific detail rendered into status lines ('exit code: 3', 'max-tokens'). */
detail?: string
/** Final output for tasks without `readOutput`; stream tasks leave it unset. */
output?: string
}
消费方视图
快照是每次新建的只读投影。ownerSession 携带用于授权的共享 SessionId；完成监听器则会另行收到用于生命周期清理的确切拥有者对象。另一个接口已经交付终止状态或承诺交付时，reported 会抑制完成通知。
/**
* A read-only projection of one task, safe to hand to listeners and tools —
* a fresh object per call, never live registry state.
*/
interface TaskSnapshot {
/** The registry-issued id (`<kind>-N`). */
id: TaskId
/** The producer kind the task was registered with. */
kind: TaskKind
/** The producer-supplied one-line label. */
label: string
/** Producer-owned cap for complete model-facing notices and output reads. */
outputLimitBytes?: number
/**
* Owner session id used for authorization and correlation; absent for
* unowned tasks. Completion listeners receive the exact {@link Agent}
* separately through {@link TaskDoneListener}.
*/
ownerSession?: SessionId
/** Current lifecycle state. */
status: TaskStatus
/** Kind-specific status detail, present once the producer supplied one (usually terminal). */
detail?: string
/** Epoch ms when the task was registered. */
startedAt: number
/** Epoch ms when the task settled; absent while `running`/`stopping`. */
finishedAt?: number
/**
* True when a kill, read, or wait has reported or committed to report the
* terminal state. Completion surfaces suppress redundant notices when set.
*/
reported: boolean
}
/** Output and post-read state returned by {@link TaskService.read}. */
interface TaskRead {
/**
* Stream kinds: the consuming delta since the previous read. Final-output
* kinds: empty while live, the terminal {@link TaskOutcome.output} (or
* empty) once settled — idempotent, never consumed.
*/
text: string
/** The task's state at read time. */
snapshot: TaskSnapshot
}
服务行为
抽象的 TaskService Service Definition 规定原子 start、限定调用方作用域的 get 和 list、read、kill、有界 wait、故障隔离的 onTaskDone 监听器，以及 attachSurface 何时可用；LocalTaskService 是其进程局部 Service provider。授权会比较拥有者会话；拥有者清理会选择确切的已注册 Agent 实例。Service Definition 约定见 dsh-tasks，注册表生命周期见 dsh-tasks-local，面向模型的 Consumer 见 dsh-tool-tasks。
Cordis surface
Generated from source by scripts/gen-cordis-catalog.ts (verified fresh by pnpm run verify-cordis-catalog in doc-sync; regenerate with pnpm run gen-cordis-catalog) — this section is byte-identical in both language sides of the page. Signature blocks use a ts cordis-catalog fence and keep the original source JSDoc; dispatch modes are defined in the primer, and the framework-inherited ctx surface lives in cordis-api/inherited.md.
ctx.tasks — TaskService (abstract seam)
Abstract background task registry. Subclass, implement the abstract methods, and load the subclass as a plugin — it registers as ctx.tasks (one implementation per context; loading a second throws, which is cordis' standard duplicate-service behavior).
Implementations must honor these semantics:
- Registrations outlive producer and control-surface fibers. Owner and service disposal cancel live work and await compliant producers; a throwing teardown cancel force-fails only the record.
- Owned-task access is fenced by the owner's session id. Ids are predictable, so authorization — not secrecy — is the boundary.
- Settlement is first-wins: one terminal record, one round of contained listener notification, and released waiters, even against a late producer outcome.
- start refuses work while no attached control surface serves the spec's owner, so a producer cannot start work that owner cannot collect or stop. One registry serves every composition in the process, so this question — and completion-listener delivery — is owner-relative rather than process-wide: registrations made from an unscoped context serve every owner, and registrations made under an agent composition's scope serve exactly the agents composed under it.
/**
* Preflight access, validation, and owner cleanup before starting and
* atomically registering work. A throwing starter leaves nothing registered;
* after it returns, registration cannot fail. Settlement records the outcome,
* notifies listeners, and releases waiters.
* @param spec - task identity, owner, and synchronous starter.
* @returns the registry-issued `<kind>-N` id.
*/
abstract start(spec: TaskStart): TaskId
/**
* List caller-owned and unowned tasks in registration order without exposing
* another session's labels.
* @param caller - reading agent; a non-agent caller sees only unowned tasks.
* @returns fresh snapshots.
*/
abstract list(caller?: Agent): TaskSnapshot[]
/**
* Return a non-consuming snapshot without changing its read cursor or notice
* state. Throws for an unknown or foreign task.
* @param id - task to look up.
* @param caller - reading agent checked against the owner.
* @returns a fresh snapshot.
*/
abstract get(id: TaskId, caller?: Agent): TaskSnapshot
/**
* Read the next stream delta, or the idempotent final output after settlement.
* A terminal read marks the task reported. Throws for an unknown or foreign
* task.
* @param id - task to read.
* @param caller - reading agent checked against the owner.
* @returns output text and the post-read snapshot.
*/
abstract read(id: TaskId, caller?: Agent): TaskRead
/**
* Request cancellation, then mark the task stopping and reported. A producer
* throw propagates without changing task state. Throws for an unknown or
* foreign task.
* @param id - task to cancel.
* @param caller - killing agent checked against the owner.
* @param reason - logged reason forwarded to the producer.
* @returns `requested` for live work, otherwise `already-finished`.
*/
abstract kill(id: TaskId, caller?: Agent, reason?: string): 'requested' | 'already-finished'
/**
* Wait for settlement or timeout without cancelling the task. Caller abort
* rejects only while the task is live; after settlement the terminal
* snapshot wins so a notice suppressed for this waiter is still delivered.
* Throws for invalid, unknown, or foreign input.
* @param id - task to wait for.
* @param timeoutMs - positive finite wait bound in milliseconds.
* @param caller - waiting agent checked against the owner.
* @param signal - optional cancellation of the wait itself.
* @returns snapshot at settlement or timeout.
*/
abstract wait(id: TaskId, timeoutMs: number, caller?: Agent, signal?: AbortSignal): Promise<TaskSnapshot>
/**
* Register an effect-scoped completion listener. It receives the settlements
* of the owners its registering context's scope covers; each listener is
* contained; returned promises are observed but not awaited. No listener runs
* after service disposal.
* @param listener - receives each terminal snapshot and its exact owner.
* @returns disposer that unregisters the listener.
*/
abstract onTaskDone(listener: TaskDoneListener): () => void
/**
* Attach an effect-scoped surface that can read and stop tasks. It serves the
* owners its registering context's scope covers, and {@link start} refuses an
* owner no attached surface serves.
* @param name - diagnostic label; duplicate names remain independent.
* @returns disposer that detaches this surface.
*/
abstract attachSurface(name: string): () => void
Types: Agent