deepseek-harness/packages/subagent/subagent-fork/README.md

@deepseek-ai/dsh-subagent-fork

In-process provider that starts a child Agent from the parent's completed conversation prefix. It shares startInProcessRun with the spawn provider; the seed is the only backend difference.

Seed boundary

The delegating tool runs inside an open parent turn whose tool call has no result yet. Forking that tail would create an invalid, unbalanced child log, so the provider copies only the prefix through the last turn/end. A first-turn fork therefore starts with an empty seed. CreateAgentOptions.seed carries the contiguous prefix into session preparation.

Capabilities

{ outputSchema: true, depthLimit: true, toolFilter: true, persona: true }

Config

Key	Meaning
providerName	Registry name on ctx.subagents (default fork).