Tianyi Cui
9bc4df28c1
Address review on the hook-bridges PR — two composability/compatibility bugs in both the CC and Codex bridges: 1. A hook that only attaches additionalContext (no block/deny) returned `allow`/`accept` WITHOUT calling next(), short-circuiting every later agent/prompt-submit / tools/post-execute listener. A policy/sandbox plugin registered after the bridge never saw the prompt. Now the context-only path delegates via next() and folds its context onto the downstream decision (concatContext): a downstream block/deny still wins and carries the bridge context; a downstream allow/accept keeps its own content rewrite and gains the context. Only a real hook deny/block short-circuits. 2. CLAUDE_PROJECT_DIR was empty in the default ACP wiring (no projectDir configured), breaking common unmodified hooks that reference $CLAUDE_PROJECT_DIR. It now defaults per-run to the agent's session workspace (the same cwd the hook runs in); an explicit config.projectDir still wins. Regression tests per bridge: a later listener blocks a prompt a context-only hook allowed; both contexts survive when the downstream also adds one; the default CLAUDE_PROJECT_DIR reaches the hook. Each proven red on the pre-fix code.
59 lines
4.2 KiB
Markdown
59 lines
4.2 KiB
Markdown
# @deepseek-ai/dsh-hooks-codex
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A cordis plugin that runs a user's existing **Codex** `hooks.json` on the harness's canonical interception seams. The **Codex dialect** half of the hooks subsystem. The dialect-agnostic primitives come from [`@deepseek-ai/dsh-hook-protocol`](../hook-protocol/README.md); this bridge owns the Codex-specific payloads, matcher mode, and decision mapping.
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Codex's hook protocol is a deliberate **subset** of Claude Code's (same `hooks.json` shape):
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- **Five hook points only:** `PreToolUse`, `PostToolUse`, `SessionStart`, `UserPromptSubmit`, `Stop` — no subagent / notification / compaction hooks.
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- **Regex-only matchers** (no literal fast path; the matcher is always an unanchored regex).
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- **snake_case stdin payloads** with `turn_id`/`model` extras, written **without** a trailing newline.
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- **No env vars and no command substitution** (a literal `${…}` in a command survives verbatim).
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- **A block-only decision model** — `allow`/`ask` are not honored; a hook can only block, never pre-approve.
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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](../../../docs/rfc/implemented/feature/2026-06-30-interception-seams.md)).
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## Config
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```ts
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import type { Config } from '@deepseek-ai/dsh-hooks-codex'
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const config: Config = {
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configPath: '/path/to/.codex/hooks.json', // required
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model: 'deepseek-v4', // optional: stamped on every payload (Codex includes `model`)
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defaultTimeoutMs: 600_000, // optional: per-hook timeout when a hook sets none
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}
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```
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In a `cordis.yml`:
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```yaml
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- dsh-hooks-codex:
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configPath: ./.codex/hooks.json
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model: deepseek-v4
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```
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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. Events outside the five Codex points are dropped at parse.
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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.
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## Hook points → seam Decisions
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| Codex hook | Harness seam | Mapping |
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|---|---|---|
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| `SessionStart` | `agent/session-start` (emit) | a plain-stdout hook's output → additionalContext → `agent.inject()` |
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| `UserPromptSubmit` | `agent/prompt-submit` (waterfall) | `block` (exit 2) → `PromptDecision.block`; additionalContext-only → delegate via `next()` then fold context onto the downstream decision |
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| `PreToolUse` | `tools/pre-execute` (waterfall) | `block` → `PreToolDecision.deny` (no `allow`/`ask`) |
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| `PostToolUse` | `tools/post-execute` (waterfall) | `block` → `block` with feedback; additionalContext-only → delegate via `next()` then fold context onto the downstream decision |
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| `Stop` | `agent/turn-continuation` (waterfall) | a blocking Stop hook forces `continue` with the reason as next-step steering |
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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.
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## Context source
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Injected context carries an explicit `{ kind: 'plugin', plugin: 'hooks-codex' }` source (`agent.inject()` would otherwise default it to `{ kind: 'user' }`).
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## Deferred
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**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.
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**`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`).
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