62 lines
3.3 KiB
Markdown
62 lines
3.3 KiB
Markdown
# @deepseek-ai/dsh-subagent-fork
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English | [中文](README.zh.md)
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The fork provider creates an in-process child seeded with the parent's completed conversation turns. It shares all run mechanics with spawn; the session seed is the only behavioral difference.
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## Seed boundary
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The parent's current tool-calling turn is still open when a subagent starts: its log contains the assistant tool call but not the matching tool result or `turn/end`. Copying that raw log would give the child an invalid, unbalanced session.
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Fork therefore computes the contiguous prefix ending at the last `turn/end`. The child sees all completed parent turns and none of the in-flight turn. If the parent has not completed a turn yet, the seed is empty and the child behaves like a fresh spawn.
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The seed transfers conversation history only. The child still receives a fresh flat registration scope; it does not inherit the parent's tool restrictions or authority.
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## Start and capabilities
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`start(request)` passes the completed-turn seed to [`startInProcessRun`](../subagent-inprocess/README.md) and awaits child publication. The shared driver owns cancellation, depth, customization, result reading, and disposal.
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Fork advertises `{ outputSchema: true, depthLimit: true, toolFilter: true, persona: true }`, identical to spawn.
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## Config
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| Key | Meaning |
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|---|---|
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| `providerName` | Registry name on `ctx.subagents` (default `fork`). |
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See [`dsh-subagent-spawn`](../subagent-spawn/README.md) for the run lifecycle, model inheritance, and depth tracking — all shared.
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## Model Experience
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### Child-agent history and envelope
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#### What the model sees
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The child receives the parent's balanced completed-turn surface prefix, then the new task content verbatim. A configured persona shadows prompt text in the child's fresh scope; a tool restriction filters its global wire schemas, executable lookup, and Code Mode SDK bindings but not standalone guidance. The parent's tool view and authority are not inherited. An optional structured-output request adds its child-only contract. The parent's current in-flight turn is excluded.
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#### Token effect
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Forking duplicates retained completed history into separate child requests; the child then accumulates its own tokens independently. Persona changes repeated prompt cost, filtering changes schema or generated SDK cost, and a first-turn fork has no inherited history.
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#### KV Cache effect
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The child may reuse the inherited byte-identical prefix under the same provider and model. Persona, tool-filter, generated-SDK, or route changes may invalidate reuse before inherited history; later child history is append-only.
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### Parent tool result, indirectly
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#### What the model sees
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The parent receives only the child's own final output through `dsh-tool-subagent`, not the inherited prefix or intermediate work.
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#### Token effect
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Parent input grows by one data-dependent final result retained until compaction.
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#### KV Cache effect
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Append-only; newly visible content follows the reusable request prefix and does not invalidate existing KV-cache entries.
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## Known Limitations and Deferred Work
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- **Runs expose no `sendMessage`/`resume`** — the optional runtime capabilities are absent on in-process runs.
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- **The seed is a one-time snapshot** — the child sees the parent's completed turns as of the fork and nothing the parent logs afterwards; there is no live context sharing.
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