feat(subagent): continuable background subagents
Implement the continuable background subagents RFC: a durable child session with a series of Task-backed activations, each disposing its run before the Task settles. - dsh-subagent: rename SubagentRun.sendMessage to strict steer, drop run-level resume, add SubagentProvider.resume dispatch via SubagentService.resume, the continuation start field, and the versioned model-hidden subagent/descriptor session event. - dsh-subagent-inprocess/-spawn/-fork: publish the control-allocated child id, append the descriptor inside the initial turn, implement cold resume from the child's own transcript under the live parent scope, and strict running-only steer. - dsh-subagent-control (new): SubagentControlService owning stable child ids, descriptor snapshot/fold/authorization, Task-backed activation with settle-then-dispose ordering, the process-local active-run association, and steer-or-resume sendMessage routing. - dsh-tool-subagent: background route branches on the provider's resume capability (continuable via the control service; one-shot task for ACP), returning both child and task ids. - dsh-tool-subagent-control (new): the globally named send_message tool rendering steered/started routes. Keyless coverage spans Task ownership and disposal ordering, running delivery, cold follow-up, descriptor rejection and rollback, known-id reconstruction, kill during lookup, admission races, and a new subagent-continuable ACP snapshot scenario.
This commit is contained in:
Dudu-0223
@@ -880,6 +880,20 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
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},
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],
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},
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{
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key: 'subagentControl',
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summary: 'The continuable-subagent orchestration service.',
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methods: [
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{
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signature: 'startContinuable(spec: ContinuableStartSpec): ContinuableStart',
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jsDoc: '/**\n * Start a continuable background child: allocate its stable session id,\n * snapshot its durable descriptor, and register the initial activation\'s\n * Task. A synchronous validation failure (a non-JSON descriptor input,\n * missing persistence, Task preflight) throws without creating a Task; the\n * method otherwise returns both identities immediately, without waiting for\n * child publication or descriptor durability. Asynchronous startup failure\n * settles the returned Task as `failed` (or `killed` when cancelled) after\n * any published run is disposed, which can leave an unmaterialized child id\n * that later by-id operations report as unavailable.\n * @param spec - provider, Task label, and the delegation request.\n * @returns the stable child id and the initial activation\'s Task id.\n */',
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},
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{
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signature: 'sendMessage(parent: Agent, childId: SessionId, message: ContentBlock[]): SendMessageResult',
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jsDoc: '/**\n * Deliver one message to a known continuable child: steer its running\n * activation, or cold-resume the durable session into a fresh Task-backed\n * activation. The two routes are reported distinctly so timing-dependent\n * routing is observable. A throw means the message was NOT delivered — in\n * particular, losing a race with Task settlement does not fall through to\n * cold resume within the same call; a later retry after Task terminal may\n * start the next activation. The started Task owns descriptor lookup and\n * direct-parent authorization (its AbortSignal exists before that lookup),\n * so an unknown, foreign, or descriptor-less child settles the started Task\n * as `failed` with a detail reporting the id as unavailable.\n * @param parent - the live parent agent sending the message (model tool or\n * human adapter); Task access is authorized by its session id.\n * @param childId - the stable child session id.\n * @param message - the content to deliver.\n * @returns whether the message `steered` the existing Task or `started` a new one.\n */',
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},
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],
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},
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{
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key: 'subagents',
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summary: 'Named provider registry and capability-checked start surface.',
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@@ -900,6 +914,10 @@ export const SERVICE_API: readonly ServiceApiEntry[] = [
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signature: 'async start(name: string, request: SubagentStartRequest): Promise<SubagentRun>',
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jsDoc: '/**\n * Establish a ready child on the named provider. Capability and semantic\n * checks run before delegation. Provider ownership lasts until its promise\n * fulfills; a rejection therefore has no run for the caller to dispose and\n * emits no run lifecycle events.\n * @param name - the provider to use.\n * @param request - child prompt, parent, signal, and optional capabilities.\n * @returns the ready holder-owned run.\n */',
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},
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{
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signature: 'async resume(name: string, request: SubagentResumeRequest): Promise<SubagentRun>',
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jsDoc: '/**\n * Resume a persisted continuable child through the named provider\'s\n * `resume` capability, with the same run lifecycle observation as\n * {@link start}. The caller (the control service) has already loaded the\n * child, folded its descriptor, and authorized the parent; this method owns\n * only capability-checked dispatch.\n * @param name - the provider recorded in the child\'s descriptor.\n * @param request - the fully resolved resume request.\n * @returns the fresh holder-owned run for the resumed activation.\n */',
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},
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],
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},
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{
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@@ -1783,6 +1801,14 @@ export const TYPE_API: readonly TypeApiEntry[] = [
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name: 'ContentBlockType',
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declaration: 'export type ContentBlockType = keyof ContentBlockMap;',
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},
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{
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name: 'ContinuableStart',
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declaration: 'export interface ContinuableStart {\n readonly childId: SessionId;\n readonly taskId: TaskId;\n}',
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},
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{
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name: 'ContinuableStartSpec',
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declaration: 'export interface ContinuableStartSpec {\n readonly provider: string;\n readonly label: string;\n readonly request: Omit<SubagentStartRequest, \'signal\' | \'continuation\'>;\n}',
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},
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{
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name: 'CreateAgentOptions',
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declaration: 'export interface CreateAgentOptions {\n readonly sessionId: SessionId;\n readonly meta?: {\n readonly cwd?: string;\n readonly parentSession?: SessionId;\n readonly seedLength?: number;\n readonly delegationDepth?: number;\n };\n readonly seed?: readonly SessionEvent[];\n readonly agentOptions?: AgentOptions;\n readonly signal?: AbortSignal;\n readonly setup?: (agentCtx: Context) => Promise<void> | void;\n}',
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@@ -2331,6 +2357,10 @@ export const TYPE_API: readonly TypeApiEntry[] = [
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name: 'SearchResultView',
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declaration: 'export type SearchResultView = SearchMatchesResultView | SearchPathsResultView;',
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},
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{
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name: 'SendMessageResult',
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declaration: 'export type SendMessageResult = {\n readonly route: \'steered\';\n readonly taskId: TaskId;\n} | {\n readonly route: \'started\';\n readonly taskId: TaskId;\n};',
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},
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{
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name: 'SendOptions',
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declaration: 'export interface SendOptions {\n target: SendTarget;\n wakeup: boolean;\n}',
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@@ -2651,21 +2681,33 @@ export const TYPE_API: readonly TypeApiEntry[] = [
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name: 'SubagentCapabilities',
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declaration: 'export interface SubagentCapabilities {\n readonly outputSchema: boolean;\n readonly depthLimit: boolean;\n readonly toolFilter: boolean;\n readonly persona: boolean;\n}',
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},
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{
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name: 'SubagentContinuation',
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declaration: 'export interface SubagentContinuation {\n readonly sessionId: SessionId;\n readonly descriptor: SubagentDescriptorData;\n}',
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},
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{
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name: 'SubagentDescriptorData',
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declaration: 'export interface SubagentDescriptorData {\n readonly version: number;\n readonly provider: string;\n readonly agentProvider?: string;\n readonly agentModel?: string;\n readonly persona?: string;\n readonly toolFilter?: ToolRestriction;\n}',
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},
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{
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name: 'SubagentProvider',
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declaration: 'export interface SubagentProvider {\n readonly name: string;\n readonly capabilities: SubagentCapabilities;\n readonly inheritsParentContext: boolean;\n start(request: SubagentStartRequest): Promise<SubagentRun>;\n}',
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declaration: 'export interface SubagentProvider {\n readonly name: string;\n readonly capabilities: SubagentCapabilities;\n readonly inheritsParentContext: boolean;\n start(request: SubagentStartRequest): Promise<SubagentRun>;\n resume?(request: SubagentResumeRequest): Promise<SubagentRun>;\n}',
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},
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{
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name: 'SubagentResult',
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declaration: 'export interface SubagentResult {\n readonly output: ContentBlock[];\n readonly structured?: unknown;\n readonly stopReason: SubagentStopReason;\n}',
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},
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{
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name: 'SubagentResumeRequest',
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declaration: 'export interface SubagentResumeRequest {\n readonly sessionId: SessionId;\n readonly prompt: ContentBlock[];\n readonly parent: Agent;\n readonly signal: AbortSignal;\n readonly descriptor: SubagentDescriptorData;\n}',
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},
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{
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name: 'SubagentRun',
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declaration: 'export interface SubagentRun {\n readonly id: SessionId;\n readonly localAgent: Agent | undefined;\n readonly result: Promise<SubagentResult>;\n dispose(): Promise<void>;\n sendMessage?(content: ContentBlock[]): void;\n resume?(content: ContentBlock[]): Promise<SubagentRun>;\n}',
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declaration: 'export interface SubagentRun {\n readonly id: SessionId;\n readonly localAgent: Agent | undefined;\n readonly result: Promise<SubagentResult>;\n dispose(): Promise<void>;\n steer?(content: ContentBlock[]): void;\n}',
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},
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{
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name: 'SubagentStartRequest',
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declaration: 'export interface SubagentStartRequest {\n readonly prompt: ContentBlock[];\n readonly parent: Agent;\n readonly signal: AbortSignal;\n readonly agentOptions?: AgentOptions;\n readonly outputSchema?: ObjectJsonSchema;\n readonly maxDepth?: number;\n readonly toolFilter?: ToolRestriction;\n readonly persona?: string;\n}',
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declaration: 'export interface SubagentStartRequest {\n readonly prompt: ContentBlock[];\n readonly parent: Agent;\n readonly signal: AbortSignal;\n readonly agentOptions?: AgentOptions;\n readonly outputSchema?: ObjectJsonSchema;\n readonly maxDepth?: number;\n readonly toolFilter?: ToolRestriction;\n readonly persona?: string;\n readonly continuation?: SubagentContinuation;\n}',
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},
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{
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name: 'SubagentStopReason',
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