mirror of
https://github.com/deepseek-ai/deepseek-harness
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75 lines
3.2 KiB
TypeScript
75 lines
3.2 KiB
TypeScript
/**
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* The in-process FORK subagent backend: registers a {@link SubagentProvider} on
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* `ctx.subagents` that runs each child as a child {@link Agent} SEEDED with a prefix of the
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* parent's session log — so the child inherits the parent's conversation context instead of
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* starting fresh. The seed ends at the last `turn/end`: the current tool-call turn is
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* unbalanced and cannot be replayed as a valid child session.
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* @module @deepseek-ai/dsh-subagent-fork
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*/
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import type { Context } from 'cordis'
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import z from 'schemastery'
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import type { SessionEvent } from '@deepseek-ai/dsh-session'
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import type { Agent } from '@deepseek-ai/dsh-agent'
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import type { SubagentCapabilities, SubagentProvider, SubagentStartRequest } from '@deepseek-ai/dsh-subagent'
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import { startInProcessRun } from '@deepseek-ai/dsh-subagent-inprocess'
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export const name = 'subagent-fork'
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// `tools` is deliberately NOT injected — same rationale as subagent-spawn: the
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// per-run structured runtime gates its capture-tool registration on `tools`
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// itself, so this backend's apply timing (and the delegation tool's position
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// in the model-visible tool list) is unchanged by structured output.
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export const inject = ['subagents']
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/** Config: the registry name to register the provider under. */
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export interface Config {
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/** Provider name on `ctx.subagents` (default `fork`). */
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providerName: string
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}
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export const Config: z<Config> = z.object({
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providerName: z.string().default('fork'),
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})
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/**
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* The balanced completed-turn prefix of `parent`'s log: every event up to and including the
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* last `turn/end`. The in-flight turn is excluded; before any completed turn the child starts
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* fresh. Because live sequence numbers equal array indexes, the result remains a valid seed
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* beginning at sequence zero.
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* @param parent - the agent whose session log to slice.
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* @returns the seed events, contiguous from seq 0; empty when no turn has completed.
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*/
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export function completedTurnPrefix(parent: Agent): SessionEvent[] {
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const events = parent.session.events
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const lastEnd = events.findLast(e => e.type === 'turn/end')
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if (lastEnd === undefined) return []
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// seq === array index (the append contract), so slice up to and including it.
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return events.slice(0, lastEnd.seq + 1)
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}
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/**
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* The fork provider. Supports `depthLimit` and `outputSchema` (via the shared
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* in-process structured runtime), plus `toolFilter`/`persona` (scoped
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* restrict() and a scoped shadowing persona section).
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*/
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class ForkProvider implements SubagentProvider {
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readonly capabilities: SubagentCapabilities = { outputSchema: true, depthLimit: true, toolFilter: true, persona: true }
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// Context contract: a forked child IS seeded with the parent's completed-turn prefix.
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readonly inheritsParentContext = true
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constructor(readonly name: string) {}
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start(request: SubagentStartRequest) {
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const seed = completedTurnPrefix(request.parent)
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return startInProcessRun(request, {
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// Only pass a seed when there's a completed turn to inherit; an empty seed
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// is equivalent to a fresh child, so omit it to keep the session unseeded.
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...seed.length > 0 ? { seed } : {},
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})
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}
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}
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export function apply(ctx: Context, config: Config): void {
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ctx.subagents.registerProvider(new ForkProvider(config.providerName))
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}
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