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c58097a826
Write handles now hold a durable lease (session.lock.json beside the log): a random owner token, diagnostic pid, and an expiry. Acquisition wins by exclusive create; a second process's create or write open rejects while the record is unrenewed for less than leaseTtlMs (default 5 min), and takes over after that — a crashed holder is waited out, never reclaimed by pid. The holder renews every leaseRenewIntervalMs (default 4 min); a renewal that finds a foreign, vanished, or expired record — or fails outright — marks the lease lost permanently, so every later append/flush rejects with SessionOwnershipLostError while reads continue. Close releases the record; read handles never touch it. Takeover of an expired record is eventually exclusive: a replaced holder stops within one renewal interval. Refs #3245
description, kind
| description | kind |
|---|---|
| The subagent package group: the delegation seam, its in-process and out-of-process backends, and the model-facing delegation tools. | package-group |
subagent/ — subagent capability family
English | 中文
Summary
The subagent group is the delegation family: it lets an agent hand a task to a child agent, wait for or continue the child's work, and keep every child discoverable. One contract (ctx.subagents) serves any number of named providers, so a single composition can mix in-process children (fresh, or forked from the parent's completed history) with out-of-process children — an ACP agent, a real Codex or Claude Code installation, or a complete Harness runtime over the SDK. The model-facing tools expose delegation, adjacent-Agent messaging, and listing to agents, and a parent can always see which children exist and whether they are live or stored. This page maps the group; each package README owns its package contract.
Table of Contents
Packages
| Package | Role | ctx key |
|---|---|---|
subagent/ |
Defines the delegation service: provider registry, one-shot runs, continuable children, and discovery | ctx.subagents |
subagent-in-process-driver/ |
Provides the shared in-process run driver | — |
subagent-spawn-in-process/ |
Runs a fresh in-process child | registers on ctx.subagents |
subagent-fork-in-process/ |
Runs an in-process child seeded from the parent's completed history | registers on ctx.subagents |
subagent-acp/ |
Runs an out-of-process child over the Agent Client Protocol | registers on ctx.subagents |
subagent-codex/ |
Runs a real Codex child through the official app-server protocol | registers on ctx.subagents |
subagent-claude-code/ |
Runs a real Claude Code child through the official Agent SDK | registers on ctx.subagents |
subagent-dsh-sdk/ |
Runs an out-of-process Harness child through the TypeScript SDK | registers on ctx.subagents |
tool-subagent/ |
Exposes delegation to the model | registers on ctx.tools |
tool-subagent-control/ |
Exposes adjacent-Agent messaging, interrupt, and listing to the model | registers on ctx.tools |
Related documentation
- Subagent subsystem — the service contract, provider contract, and terminal result semantics.
- Subagent capability seam — the design record for the delegation capability family.
- Continuable background subagents — durable children that accept follow-up turns.
- Merged subagent control service — the follow-up, interrupt, and listing surface.
Dev Note
None.