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The emit-shaped hook points (SessionStart, SubagentStart, SubagentStop) run fire-and-forget: no seam awaits the run chain, so disposing a bridge could strand a live hook process and let a late continuation inject into a disposed context. The floating continuation also made the coverage gate racy: the only coverage of the SubagentStart continuation's no-context branch arm rode on an un-awaited .then, and on a loaded CI runner the fork's per-file coverage snapshot beat it — master run 28798191671 failed the 100% branch gate on hooks-claude/src/index.ts at 99.03% (uncovered line 336) with the identical tree passing the PR run three minutes earlier. New shared primitive createDetachedRuns() in dsh-hook-protocol: a bridge tracks each detached run chain, passes the tracker's abort signal to runHook, and registers drain() as its effect disposer — drain aborts still-running hook processes (a kill via the bash seam, not a wait out to the 10-minute default hook timeout), then resolves once every chain has settled. fiber.dispose() resolving now means the bridge's detached work is quiescent (docs/defensive-patterns.md). The subagent marker test disposes the bridge as its sync point, so the formerly racy branch arm is executed deterministically before the file's coverage snapshot; new tests pin abort-on-dispose promptness for both bridges and the tracker's settle/drain contract in hook-protocol.
hooks/ — hook bridges + shared protocol
The hooks subsystem lets users extend the agent at lifecycle points the way Claude Code and Codex do — by pointing a bridge plugin at an existing hooks.json (or settings) so those external shell hooks run faithfully. The canonical extension surface itself is the harness's typed interception seams (the interception-seams RFC); a "native hook" is just an ordinary cordis plugin on those seams. These packages are the bridges that translate the external shell-hook protocol onto that same surface, plus the shared wire-protocol library they build on.
| Package | Role | Shape |
|---|---|---|
hook-protocol/ |
Shared wire-protocol core: matcher primitive, exit-code/stdout codec, runHook (via ctx.bash), most-restrictive merge, hook/* session events, detached-run quiescence |
library (no plugin) |
hooks-claude/ |
Bridge for a Claude Code hooks.json / settings |
plugin |
hooks-codex/ |
Bridge for a Codex hooks.json |
plugin |
Codex deliberately reimplements a subset of the Claude Code protocol (same hooks.json shape, 5 events vs CC's many, command-only, regex-only matcher, no env/substitution), so hook-protocol owns the genuinely-identical primitives and each bridge owns only what differs (its per-event stdin payload, env, and the mapping of a hook's neutral outcome onto the harness's typed Decisions). See hook-protocol/README.md.