1/**

2 * The in-process SPAWN subagent backend: registers a {@link SubagentProvider} on

3 * `ctx.subagents` that runs each child as a fresh child {@link Agent} on the same cordis

4 * context (its own session, own system prompt, zero parent context). The cheapest transport,

5 * reusing the agent factory's quiescent teardown.

6 * @module @deepseek-ai/dsh-subagent-spawn-in-process

7 */

8

9import type { Context } from '@deepseek-ai/cordis'

10import z from '@deepseek-ai/schemastery'

11import type {

12 ContinuableCreateSpec,

13 ResolvedSubagentStartRequest,

14 SubagentCapabilities,

15 SubagentProvider,

16} from '@deepseek-ai/dsh-subagent'

17import { startInProcessRun } from '@deepseek-ai/dsh-subagent-in-process-driver'

18

19export const name = 'subagent-spawn-in-process'

20// `tools` is deliberately not injected: the child factory already provides it during setup,

21// and adding it here would unnecessarily change this provider's apply timing.

22export const inject = ['subagents']

23

24/** Config: the registry name to register the provider under. */

25export interface Config {

26 /** Provider name on `ctx.subagents` (default `spawn`). */

27 providerName: string

28}

29

30export const Config: z<Config> = z.object({

31 providerName: z.string().default('spawn'),

32})

33

34/**

35 * The spawn provider. Supports every start-time capability: `depthLimit` (it

36 * constructs the child, so it can enforce a recursion cap), `outputSchema`

37 * (the scoped structured runtime), `agentOptions` (merged over the parent

38 * route), and `toolFilter`/`persona` (scoped `restrict()` and a scoped

39 * shadowing persona section, applied in the child's creation window).

40 */

41class SpawnInProcessProvider implements SubagentProvider {

42 readonly capabilities: SubagentCapabilities = {

43 agentOptions: true,

44 outputSchema: true,

45 depthLimit: true,

46 toolFilter: true,

47 persona: true,

48 }

49 // Context contract: a spawned child starts fresh — it never sees the parent conversation.

50 readonly inheritsParentContext = false

51

52 constructor(readonly name: string) {}

53

54 start(request: ResolvedSubagentStartRequest) {

55 // Fresh child: no seed. The shared driver mints ids, stamps cwd/lineage/

56 // depth, drives the one-shot (including the structured capture when the

57 // request carries an outputSchema), and maps the result.

58 return startInProcessRun(request, {})

59 }

60

61 prepareContinuable(): Promise<ContinuableCreateSpec> {

62 // A spawned child starts fresh, so it contributes no seed; the continuation

63 // manager owns every later operation on it.

64 return Promise.resolve({})

65 }

66}

67

68export function apply(ctx: Context, config: Config): void {

69 ctx.subagents.registerProvider(new SpawnInProcessProvider(config.providerName))

70}