a4152705ef
Codex review of the draft: the abort-on-dispose tests asserted only that dispose() resolved and no warning fired — a regression back to untracked fire-and-forget runs would pass both. The hook script now records its shell PID before sleeping, and after dispose the test asserts process.kill(pid, 0) throws: the drain resolves only after the killed run settled (the child reaped), so ESRCH-by-dispose-return is deterministic under the correct implementation, while an alive or unreaped process fails it. Verified the discriminator by gutting drain() locally: exactly these two tests fail.
@deepseek-ai/dsh-hooks-codex
A cordis plugin that runs a user's existing Codex hooks.json on the harness's canonical interception seams. The Codex dialect half of the hooks subsystem. The dialect-agnostic primitives come from @deepseek-ai/dsh-hook-protocol; this bridge owns the Codex-specific payloads, matcher mode, and decision mapping.
Codex's hook protocol is a deliberate subset of Claude Code's (same hooks.json shape):
- Five hook points only:
PreToolUse,PostToolUse,SessionStart,UserPromptSubmit,Stop— no subagent / notification / compaction hooks. - Regex-only matchers (no literal fast path; the matcher is always an unanchored regex).
- snake_case stdin payloads with
turn_id/modelextras, written without a trailing newline. - No env vars and no command substitution (a literal
${…}in a command survives verbatim). - A block-only decision model —
allow/askare not honored; a hook can only block, never pre-approve.
A native cordis plugin could do everything this bridge does, more powerfully; the bridge exists only to run UNMODIFIED external Codex hooks faithfully (see the interception-seams RFC).
Config
import type { Config } from '@deepseek-ai/dsh-hooks-codex'
const config: Config = {
configPath: '/path/to/.codex/hooks.json', // required
model: 'deepseek-v4', // optional: stamped on every payload (Codex includes `model`)
defaultTimeoutMs: 600_000, // optional: per-hook timeout when a hook sets none
stderrSummaryMaxChars: 500, // optional: char cap on the hook/result event's persisted stderr summary
}
In a cordis.yml:
- dsh-hooks-codex:
configPath: ./.codex/hooks.json
model: deepseek-v4
The config is parsed once at load. configPath is process-level — a relative path resolves against the process launch cwd at load time, not per-session (TODO(per-session-hook-config)). A read/parse failure is contained (logs + registers nothing). Only sync type: 'command' hooks run — a non-command or async: true hook is parsed-and-skipped with a warning. A hook accepts timeout or the timeoutSec alias; one that sets neither runs under the protocol's reference default (DEFAULT_HOOK_TIMEOUT_MS from dsh-hook-protocol, 10 minutes). Events outside the five Codex points are dropped at parse.
The hooks themselves run in the agent's session workspace: for the agent-scoped points the bridge passes the session's cwd as the hook process's working directory, so a hook operates in the user's project tree, not the server launch dir.
Hook points → seam Decisions
| Codex hook | Harness seam | Mapping |
|---|---|---|
SessionStart |
agent/session-start (emit) |
a plain-stdout hook's output → additionalContext → agent.inject() |
UserPromptSubmit |
agent/prompt-submit (waterfall) |
block (exit 2) → PromptDecision.block; additionalContext-only → delegate via next() then fold context onto the downstream decision |
PreToolUse |
tools/pre-execute (waterfall) |
block → PreToolDecision.deny (no allow/ask) |
PostToolUse |
tools/post-execute (waterfall) |
block → block with feedback; additionalContext-only → delegate via next() then fold context onto the downstream decision |
Stop |
agent/turn-continuation (waterfall) |
a blocking Stop hook forces continue with the reason as next-step steering |
A tool call's payload carries the real tool_name (the same value the matcher tests) and Codex's tool_input: { command } shape (the command arg when present, else ''). The matcher subject is the tool name (PreToolUse/PostToolUse) or the session source (SessionStart); UserPromptSubmit/Stop ignore matchers.
SessionStart — the one emit point — runs detached; each run chain is tracked, and disposing the bridge aborts a still-running hook process, then drains the continuation before the dispose resolves (createDetachedRuns in dsh-hook-protocol).
Context source
Injected context carries an explicit { kind: 'plugin', plugin: 'hooks-codex' } source (agent.inject() would otherwise default it to { kind: 'user' }).
Deferred
Stop loop-guard (TODO(stop-loop-guard)): as in CC, a Stop hook that unconditionally blocks would force-continue every step (stop_hook_active is always false here); the loop-guard is deferred. A hook author must self-limit until it lands.
systemMessage: a hook's user-facing warning is logged + warned, not surfaced — there is no user-message channel on these seams yet (only model-facing additionalContext).