Codex wrapper: one cmux hook group per event; Codex appends session-flag hooks to user layers - #12140
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Codex discovers hooks per configuration layer and appends them low to high (user hooks.json / config.toml, project .codex, session flags), so a user handler copied into cmux's `-c hooks.<event>=` value is discovered twice and runs twice. Replace the inherited expectation (user commands spliced into cmux's session-flag values) with the verified contract: exactly one cmux group per injected event, no user handler re-declared, persistent cmux hooks still not duplicated, and a live run of the real `codex` binary through the wrapper against a hermetic fake model provider that requires each user hook and cmux's hook to fire exactly once. Fails against the previous commit's copy logic by construction. Refs #12081 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty
The previous fix copied every user-owned hook group from hooks.json into cmux's `-c hooks.<event>=` assignment on the theory that Codex treats the assignment as a replacement. Verified against the installed codex-cli 0.146.0 and 0.153.4 (codex-rs/hooks/src/engine/discovery.rs iterates config layers low to high and appends each layer's hooks.json and TOML `[hooks]` events), a session-flag assignment never replaces the user's hooks.json, config.toml `[hooks]`, or a trusted project's .codex hooks; copying them makes Codex run every user handler twice. Restore the single cmux group per event, document the layering contract where the value is emitted, and rewrite the docs precedence section to describe what Codex actually does, the trust-bypass trade-off, the one real replacement case (a user's own `-c hooks.<event>=` on the same command line replaces cmux's handler for that event), and the opt-out. Closes #12081 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty
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Included review availability: Your plan provides up to 10 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change documents Codex hook configuration precedence and wrapper behavior. It adds focused argument tests and an optional live integration test covering user hooks, cmux hooks, persistent hooks, socket delivery, and session-ledger creation. ChangesCodex hook precedence
Priority: ➖ Normal — Impact reflects medium issue severity. Estimated code review effort: 3 (Moderate) | ~20 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The wrapper now relies on Codex configuration-layer hook composition rather than copying user handlers into session flags, preventing duplicate user hook execution while retaining cmux integration. No concrete current-head merge risk remains. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 20 functions across 2 files. (1 skipped: 1 unsupported.) Full details: Cmux Full InternationalizationExplanation The PR adds 35 lines of English user-facing Markdown to Resolution Provide the new Codex wrapper documentation through the project’s locale-aware documentation/message source, add matching translated content for every locale listed in
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In `@tests/test_codex_wrapper_hook_append.py`:
- Around line 296-315: Extend the real-Codex coverage around user_hooks_json to
add cases for user TOML hooks and trusted-project .codex hook configuration,
asserting each user handler and cmux handler runs exactly once. In
CLI/CMUXCLI+CodexFireAndForgetHooks.swift lines 92-100 and docs/agent-hooks.md
lines 42-55, narrow the verification statements until they accurately reflect
the configuration layers covered by the tests.
- Around line 378-383: Update the test’s request tracking around the cmux hook
socket to record each hook event or subcommand, then assert that the recorded
invocations contain exactly one occurrence for every expected event. Replace the
broad len(requests) > 0 check while preserving the ledger existence and
non-empty assertions.
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Extend the layering test to user handlers on all twelve Codex hook events, assert that inject-args emits only `-c hooks.<event>=` pairs after the activation flags and never rewrites hooks.json, and run it in the CLI no-socket regression step so CI executes the guard against the built CLI. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty
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Agreed on consolidating into this PR. I re-verified independently before folding #12141 in: on Codex 0.153.4 with an isolated
Style only: #12141 placed the section immediately before "## Environment overrides", next to the opt-out table, which reads a little better than between the Integrations table and the OpenCode paragraph. Plan: #12141 is now a draft and will be closed once this PR is green; its evidence stays in its description. Note both PRs are currently blocked by main's |
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Inline comments:
In @.github/workflows/ci.yml:
- Line 1390: Update the CI step invoking test_codex_wrapper_hook_append.py so
the live Codex prerequisite is mandatory: install or provision Codex CLI, set
CMUX_TEST_REAL_CODEX, and validate the required supported versions 0.146.0 and
0.153.4 before running the test. Ensure the workflow fails when the prerequisite
is unavailable rather than allowing unittest.SkipTest to produce a passing skip.
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Review follow-ups on #12140: - Live test: add a `[hooks]` SessionStart handler in config.toml and a trusted project's `.codex/hooks.json` handler, so every documented user layer is exercised; resolve the temp path because Codex trusts a project by its canonical path (macOS `/var` -> `/private/var`). - Live test: route every cmux CLI call through a logging shim and require exactly one inject-args, session-start, prompt-submit, and stop invocation instead of "at least one socket request". - Live test: Python 3.9 compatible cleanup (mkdtemp + rmtree) and an explicit CMUX_TEST_REQUIRE_REAL_CODEX=1 opt-in that turns a missing codex into a failure where it is provisioned. - Docs and emitter comment: Codex registers user and project handlers before cmux's but dispatches an event's handlers together (FuturesUnordered) and orders only their results, so nothing may depend on cmux's handler running first or last; the activation and trust-bypass flags are added only when at least one event still needs injection; section moved next to the environment override table. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty
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Folded all three in ab707aa, thanks:
Also took the placement suggestion: the section now sits right before "Environment overrides". #12147 is fixed on main by #12154; I will re-merge main here so the |
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CI note for |
… green Touching ci.yml routes every CI area for this PR, and main currently fails `tests-build-and-lag` in its own "Validate Swift warning budget" step (unbudgeted warnings in app sources this PR does not touch), which turns the required ci-status check red for any workflow-touching PR. Keep the PR scoped: the test stays, runs locally against the built CLI, and gets its no-socket CI line once that lane is green again. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty
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Status note on CI: with #12147 fixed (#12154) the full lane got past |
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Review audit against HEAD
Bot summaries: cubic pass, Cursor Bugbot pass (low risk, comment-only Swift), CodeRabbit follow-ups resolved. Required checks on |
Brings in #12164, #11976 (semantic agent notification admission; the VM remote-workspace resolver moves out of CMUXCLI+VMTui.swift into VMRemoteWorkspaceResolver.swift), #12155, #12145, #12163 (main also removed the Increase Disk action), #12140. Conflicts resolved: - CLI/CMUXCLI+VMTui.swift: main relocated the resolver block this branch still carried; main's copy is a superset (unattributed-match handling, canonical-id preference), so the block is dropped in favour of the typealiases main left behind. No remaining old-style call sites. - cmuxTests/CmuxTuiSurfaceProviderTests.swift: main's VMRemoteWorkspaceResolver() call form; the unused RemoteRoutingCLI typealias goes with it, as on main. - Resources/Localizable.xcstrings: union of both sides' keys. - cmux.xcodeproj/project.pbxproj re-normalized (workflow-guard-tests had flagged the earlier auto-merge as not normalized). Claude-Session: https://claude.ai/code/session_01QBDetMeke87gUWzvok9LWr
…lag hooks to user layers (manaflow-ai#12140) * test: reproduce Codex hook array replacement * fix: append cmux Codex hooks to user arrays * test: prove Codex appends session-flag hooks and never copies user hooks Codex discovers hooks per configuration layer and appends them low to high (user hooks.json / config.toml, project .codex, session flags), so a user handler copied into cmux's `-c hooks.<event>=` value is discovered twice and runs twice. Replace the inherited expectation (user commands spliced into cmux's session-flag values) with the verified contract: exactly one cmux group per injected event, no user handler re-declared, persistent cmux hooks still not duplicated, and a live run of the real `codex` binary through the wrapper against a hermetic fake model provider that requires each user hook and cmux's hook to fire exactly once. Fails against the previous commit's copy logic by construction. Refs manaflow-ai#12081 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty * fix: stop re-declaring user Codex hooks in wrapper session flags The previous fix copied every user-owned hook group from hooks.json into cmux's `-c hooks.<event>=` assignment on the theory that Codex treats the assignment as a replacement. Verified against the installed codex-cli 0.146.0 and 0.153.4 (codex-rs/hooks/src/engine/discovery.rs iterates config layers low to high and appends each layer's hooks.json and TOML `[hooks]` events), a session-flag assignment never replaces the user's hooks.json, config.toml `[hooks]`, or a trusted project's .codex hooks; copying them makes Codex run every user handler twice. Restore the single cmux group per event, document the layering contract where the value is emitted, and rewrite the docs precedence section to describe what Codex actually does, the trust-bypass trade-off, the one real replacement case (a user's own `-c hooks.<event>=` on the same command line replaces cmux's handler for that event), and the opt-out. Closes manaflow-ai#12081 Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty * test: cover every Codex hook event and run the hook test in CI Extend the layering test to user handlers on all twelve Codex hook events, assert that inject-args emits only `-c hooks.<event>=` pairs after the activation flags and never rewrites hooks.json, and run it in the CLI no-socket regression step so CI executes the guard against the built CLI. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty * test+docs: cover every user hook layer and state Codex's dispatch order Review follow-ups on manaflow-ai#12140: - Live test: add a `[hooks]` SessionStart handler in config.toml and a trusted project's `.codex/hooks.json` handler, so every documented user layer is exercised; resolve the temp path because Codex trusts a project by its canonical path (macOS `/var` -> `/private/var`). - Live test: route every cmux CLI call through a logging shim and require exactly one inject-args, session-start, prompt-submit, and stop invocation instead of "at least one socket request". - Live test: Python 3.9 compatible cleanup (mkdtemp + rmtree) and an explicit CMUX_TEST_REQUIRE_REAL_CODEX=1 opt-in that turns a missing codex into a failure where it is provisioned. - Docs and emitter comment: Codex registers user and project handlers before cmux's but dispatches an event's handlers together (FuturesUnordered) and orders only their results, so nothing may depend on cmux's handler running first or last; the activation and trust-bypass flags are added only when at least one event still needs injection; section moved next to the environment override table. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty * ci: defer wiring the Codex hook test until the warning-budget lane is green Touching ci.yml routes every CI area for this PR, and main currently fails `tests-build-and-lag` in its own "Validate Swift warning budget" step (unbudgeted warnings in app sources this PR does not touch), which turns the required ci-status check red for any workflow-touching PR. Keep the PR scoped: the test stays, runs locally against the built CLI, and gets its no-socket CI line once that lane is green again. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qiy38q5XFYQU3CeccDENty --------- Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
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Closes #12081
Summary
The issue reports that cmux's per-event
-c hooks.<event>=[...]injection replaces the user's configured hook arrays, so~/.codex/hooks.jsonhandlers stop running inside cmux. I reproduced the argv exactly as reported with the shipping 0.64.22 CLI, then measured what Codex actually does with it using the real installed binaries (codex-cli 0.153.4 from the ChatGPT app and 0.146.0 from npm) against a hermetic fake model provider, so a fullcodex execturn runs with no credentials and no network.Codex does not replace the user's hooks. Codex discovers hooks per configuration layer and appends them from lowest to highest precedence (
codex-rs/hooks/src/engine/discovery.rsatrust-v0.153.4:for layer in config_layer_stack.layers_low_to_high()loads each layer'shooks.jsonand TOML[hooks]events and appends them; the first hooks engine from 2026-03-10 already iterated layersLowestPrecedenceFirst). cmux's-c hooks.<event>=values only define the session-flags layer. In every experiment the user handler and the cmux-style handler both fired:-c hooks.SessionStart=$CODEX_HOME/hooks.json$CODEX_HOME/hooks.json$CODEX_HOME/hooks.json[hooks]inconfig.toml.codex/hooks.jsonSo the inherited fix on this branch (
20aab5c0ce, which copied every user group fromhooks.jsoninto cmux's value) would have made Codex run each user handler twice, and it also changed the injected shape thatAgentLaunchSanitizerCodexLaunchstrips from saved resume argv. This PR replaces it. Codex dispatches an event's handlers together (FuturesUnorderedindispatcher.rs) and only orders the results, so the docs describe registration order, not execution order.What changed
CLI/CMUXCLI+CodexFireAndForgetHooks.swift: back to exactly one cmux group per injected event (removes the user-hook reader, the JSON→TOML re-encoder, and the combined branch; the file is 334 lines). The emitter's doc comment states the verified layering contract. Relative tomainthis is a comment-only change; runtime behavior is unchanged.docs/agent-hooks.md, new "Codex wrapper precedence" section next to the environment-override table: the flags are added only when at least one cmux event is not covered by a persistent handler (a completecmux hooks codex installmakes the wrapper add nothing, keepingfeatures.hooks = falseintact); per-layer append with user and project handlers registered before cmux's and dispatched together; nothing inhooks.json/config.tomlis replaced or rewritten; cmux deliberately does not copy handlers (double execution); the trust-bypass and same-layer-ctrade-offs; theCMUX_CODEX_HOOKS_DISABLED=1opt-out and its cost.tests/test_codex_wrapper_hook_append.py(behavior tests against the built CLI):test_injected_hooks_do_not_redeclare_user_hooks: userhooks.jsonhandlers on all twelve Codex hook events, the six issue events with awkward commands (quotes, backslashes,''', newline); asserts the activation flags are followed only by-c hooks.<event>=pairs, the injected event set equals the CLI's own baseline, each event carries exactly one cmux group, no user command leaks into the args, andhooks.jsonis byte-identical afterwards.test_persistent_cmux_hook_is_not_duplicated: a persistently installed cmux SessionStart handler plus a user Stop handler; asserts SessionStart is skipped, Stop still carries only cmux's group, andhooks.jsonis untouched.test_live_codex_runs_user_hooks_and_cmux_hook_once_each: runs the realcodexthroughResources/bin/cmux-codex-wrapperwith a throwawayCODEX_HOME/HOME,CMUX_AGENT_HOOK_STATE_DIR, a fake cmux socket, an argv-capturing codex shim, a logging shim in front of the cmux CLI, and an in-process fake Responses API server. User handlers live in every documented user layer:hooks.json(SessionStart/UserPromptSubmit/Stop), the[hooks]table inconfig.toml, and a trusted project's.codex/hooks.json(the temp path is canonicalized because Codex trusts a project by its resolved path). Asserts the live argv shape, that each of the five user handlers ran exactly once, and that cmux'sinject-args,session-start,prompt-submit, andstopCLI calls each happened exactly once, plus socket delivery and the hook ledger. Skips with an explicit message when no real codex is installed;CMUX_TEST_REQUIRE_REAL_CODEX=1turns that into a failure where Codex is provisioned. Python 3.9 compatible.Before
Shipping 0.64.22 CLI, throwaway
CODEX_HOMEwith user SessionStart/UserPromptSubmit/Stop hooks:That argv is what the issue calls a replacement. Feeding the same shape to the real codex (Run B) shows the user's
hooks.jsonSessionStart handler still runs; the inherited copy approach (Run C) runs it twice:Verification (tagged dev build
issue-12081-codex-hook-append, HEAD8ca951b4e8)Build:
CMUX_SKIP_ZIG_BUILD=1 /Users/austinwang/manaflow/cmuxterm-hq/scripts/reload-cloud.sh --tag issue-12081-codex-hook-append --no-dev-backend --launch(run idissue-12081-codex-hook-append-43628368be81,BUILD_OK).1. Which binary was tested
2. Headless: real codex 0.153.4 through the built app's own
Resources/bin/cmux-codex-wrapper(throwawayCODEX_HOMEwith user SessionStart/UserPromptSubmit/Stop marker hooks, fake cmux socket,CMUX_AGENT_HOOK_STATE_DIR, argv captured by aCMUX_CUSTOM_CODEX_PATHshim):(With the fake socket, target resolution cannot succeed, so the throwaway ledger records the failure timestamps rather than a session; the real-app run below shows the full record.)
3. Before evidence: see "Before" above (0.64.22 argv, and Runs B/C against the real codex).
4. Full integration: real codex inside a terminal surface of the tagged dev app (tag-bound socket
/tmp/cmux-debug-issue-12081-codex-hook-append.sock,CMUX_TAG=... scripts/cmux-debug-cli.sh):The user's hooks ran, and cmux's lifecycle registration still bound the session to the dev app's workspace and surface, sent the Stop notification, and fed the agent chat events.
5. Python wrapper tests against the built CLI
The same three tests were also run against the shipped 0.64.22 CLI as a harness check (argv and live tests pass; the persistent-dedup test fails there as expected, since that release predates main's persistent-producer skip from #10838).
CI
ci.ymlis path-gated for pull requests, so on the final head the requiredci-statuscomes from the fallback workflow, andWeb complexityand the CLA checks pass. The full lane ran on3bd392c137(which touchedci.yml): its "Build for runtime regressions" step passed (compile evidence for the Swift change), then "Validate Swift warning budget" failed on main's own unbudgeted warnings in files this PR does not touch, exactly as on main's dispatched run (#12159). Earlier runs failedweb-typecheckon main'simport.meta.mainerror (#12147), fixed by #12154 and merged back here.Trade-offs (stated, not absorbed)
-c hooks.<event>=argument. That is the one real replacement in this design: cmux prepends its flags, so a later user-c hooks.<event>=wins within the session-flags layer and cmux loses that event. Documented rather than implemented; merging would require the wrapper to parse arbitrary user TOML on the command line, andcmux hooks codex installalready covers users who need both.--dangerously-bypass-hook-truststays. Pre-existing and required for cmux's session-flag handlers to run at all; the docs now say plainly that it also skips review for user and project handlers.Run CLI no-socket regressionsstep requires touchingci.yml, which routes every CI area and currently turns the requiredci-statusred on main's warning-budget breakage (CI: main fails 'Validate Swift warning budget' (tests-build-and-lag) on unbudgeted warnings from recent merges #12159). The one-line wiring is a follow-up once that lane is green; until then the test runs locally against the built CLI (outputs above).codex. It skips with an explicit message on runners without one;CMUX_TEST_REQUIRE_REAL_CODEX=1makes the prerequisite mandatory where Codex is provisioned. The argv-level tests always run.337b2c5198test,20aab5c0cefix) were already on the shared branch, so they are kept and superseded rather than rewritten.84a03c67d5(new test) is red against20aab5c0ceby construction and green fromfa909576a4on. The inherited fix was never built; its emitted value shape was reproduced by hand in Run C.--no-dev-backend. The default per-tag dev web backend host (cmux-dev-backend-1) does not resolve from this Mac; the backend serves the app's cloud features, which this verification does not touch. I also cleared an orphaned build-queue lock (created 03:05 by an xctest run that had exited; 97 minutes old) before re-queueing.timeout=10000/120000in its-cvalues, but Codex parsestimeoutas seconds (timeout_secinhook_config.rs). cmux's hook scripts return immediately, so the wrong unit is latent; changing the value also changes the shapeAgentLaunchSanitizerCodexLaunchstrips from saved argv, so it needs its own schema step.🤖 Generated with Claude Code
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