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fix(hooks): make Codex hook commands portable shell-free argv (#1215) - #1231
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…t#1215) Codex runs `command` through the host shell on every platform and never reads `commandWindows` (HookHandlerConfig::Command has no such field; serde drops it silently), so every shell-wrapped Codex entry has been a ParserError on Windows — built-ins and team dispatcher alike. - Built-ins become the bare argv form `teamai hook-dispatch <E> --tool codex`: parses identically under PowerShell and POSIX sh, stays byte-identical across platforms (the Tencent#1074 project-file contract, kept without the dead commandWindows field). Fail-open is the dispatcher's unconditional finally-exit-0 in index.ts, not a shell tail. - The team dispatcher entry becomes the absolute wrapper path `"<home>/.teamai/bin/teamai[.cmd]" hook-dispatch ...` — shell-free and PATH-assumption-free; the user-level ~/.codex/hooks.json is per-machine, so the absolute path breaks no cross-platform contract. reconcileCodexDispatchers ensures the wrapper exists before writing. - DISPATCHER_COMMAND matches both the legacy shell-wrapped forms and the new absolute form, so existing installs migrate on the next inject.
PowerShell parses a quoted path in command position as a string expression — ParserError on the arguments that follow — and needs the call operator `&`; POSIX sh needs no operator and would treat `&` as backgrounding (measured on Windows 11 / PowerShell 5.1 in the Tencent#1215 thread). The writer knows the platform, so it emits the form that platform's host shell runs: `& "<abs teamai.cmd>" ...` on Windows, `"<abs teamai>" ...` elsewhere.
The PR description includes a representative real-CLI verification record, satisfying the testing requirement. No commands from the PR were executed. |
…nt#1215) The bare argv form's PATH dependency isn't new — the old bash form needed teamai on PATH too — but its fail-open tail covered the not-found case, and the bare form dropped that: a machine where teamai is not on the hook PATH now erred visibly with an empty $LASTEXITCODE (measured on Windows 11 / PowerShell 5.1 in the Tencent#1215 thread), because the dispatcher's finally-exit-0 only covers failures after the command resolves. The '; exit 0' tail closes it back: PowerShell's CommandNotFoundException is non-terminating and POSIX sh continues after a not-found, so the entry exits 0 in both shells either way. The tail parses in both shells, keeping the string byte-identical across platforms (Tencent#1074). POSIX half verified on sh: not-found -> exit 0.
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Landed the not-found half of the direction agreed in the thread (22e3732): every Codex built-in now ends in The user-level absolute-wrapper half is deliberately held until the Codex PATH question is answered — it needs scope-aware matching, which isn't worth building ahead of that fact. |
The earlier fail-open finding is resolved: built-in commands now append the portable The PR description includes a representative real-CLI verification record, satisfying the testing requirement. No PR code was executed, built, or installed. |
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@kittimzhe Codex left a remaining finding on the Windows test assertions in |
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@kittimzhe @natinli Codex does read |
Following up on #1215 (comment). The premise in this PR's title, description, comments and tests ("Codex never reads
Since you already plan to rework this, here is a proposed split so that two PRs do not rewrite the same entry:
For the e2e record:
Please also update the title and description to match the new scope. |
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Blocking until the changes in #1231 (comment) land. The premise that Codex ignores commandWindows does not hold, so the scope needs reworking: built-ins only, with a cmd-syntax commandWindows.
…t#1215) Root cause found in the thread: Codex runs hook commands through %COMSPEC% /C on Windows (codex-rs hooks/src/engine/command_runner.rs, default_shell_command), not PowerShell. The pre-Tencent#1215 field carried PowerShell syntax, so 2>$null created a file named $null and '; exit 0' arrived as junk arguments — Windows hooks never ran correctly. This also reverts the '; exit 0' tail (22e3732): a semicolon is not a cmd separator either, so the tail is cmd-hostile the same way. Built-ins now carry the bare POSIX command (unchanged, portable) plus a cmd.exe commandWindows: nul redirect, '&' separator, exit 0 — the not-found fail-open under the actual hook shell. The '&' runs the exit whatever the dispatch did, mirroring '|| true' on the POSIX side. Builds without commandWindows support fall back to the bare command. The dispatcher keeps the plain quoted absolute path (no '&' call operator — that analysis answered the wrong shell): cmd.exe /C and sh alike resolve a quoted program path, and openai/codex#33926 wraps the command in an extra quote layer under cmd.
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Reworked per the root cause found in the thread: Codex runs hooks through What stands:
The pair design is what the maintainers originally shipped — only the Windows field's syntax was wrong (PowerShell instead of cmd). Builds without |
The PR description includes a representative real-CLI verification record, satisfying the testing requirement. Only the specified diff was read; no PR code was executed, built, or installed. |
Per the split agreed in review: the dispatcher entry belongs to Tencent#1210, so this PR no longer rewrites it — reconcileCodexDispatchers, getTeamHookDispatchCommand and DISPATCHER_COMMAND are back to main's state. What remains is the built-in half: the bare portable command plus the cmd.exe commandWindows (6124e9c).
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Scoped to the built-ins per the split agreed on #1210: the dispatcher hunks are gone (reconcileCodexDispatchers, |
The earlier Windows fixture finding is resolved for this review: the team-dispatcher implementation and test changes are no longer in the specified diff. The PR description includes a representative real-CLI verification record, satisfying the testing requirement. Only the specified diff was read; no PR code was executed, built, or installed. |
…encent#1215) Review finding: the bare argv form lost the pre-Tencent#1215 fail-open — under sh, an unresolvable teamai exits 127 instead of the old || true's 0, and the dispatcher's finally-exit-0 never runs because the CLI never starts. Windows keeps the cmd.exe commandWindows from the previous commit; command runs under sh only, so it can carry the sh tail again: 2>/dev/null || true restores the old not-found behavior exactly (exit 0, message suppressed). Byte-stability is unchanged — the string is a constant that never depends on the writing machine (Tencent#1074).
The earlier POSIX startup fail-open finding is resolved by restoring The PR description includes a representative real-CLI verification record, satisfying the testing requirement, though its reported bare commands do not match the current diff. Only the specified diff was read; no PR code was executed, built, or installed. |
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Testing the latest bot finding ( Its premise 1 — "
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| Command | Exit |
|---|---|
teamai hook-dispatch SessionStart --tool codex 2>/dev/null || true (teamai on PATH) |
0 — 2>/dev/null errors as an invalid path, then || true catches it |
same, with teamai removed from PATH |
9009 (cmd's not-found code, not 127) |
So the POSIX string is noisy but not fatal on the happy path.
The conclusion still holds — for a different reason
If any Windows Codex build does fall through to command (older build, or commandWindows stripped by a project file), that string redirects to the literal path /dev/null, which does not exist, and || true is not a cmd builtin. The [B] row shows the result: 9009, a hard failure before hook-dispatch ever starts.
2>/dev/null || true is not a portable fail-open — it is POSIX syntax that happens to be harmless when the command succeeds.
What I would change
Rather than restoring the POSIX tail on command (which is what this revision does), keep command free of shell syntax entirely:
teamai hook-dispatch <event> --tool codex
and rely on commandWindows for the Windows form. That satisfies:
- [bug] Codex hook entries on Windows are rendered in bash syntax and silently never run #1074 byte-stability — a constant, no shell tokens, identical on every platform.
- The reviewer's fail-open concern — on any Windows build that ignores the override, a bare command fails with 9009 rather than dying in a broken redirect. Neither form is fail-open there, but the bare one is at least parseable, and
hook-dispatch's ownfinally { process.exit(0) }covers the case where it actually starts. - If genuine fail-open on the
commandpath is required, it has to be expressed in each shell's own syntax, which is exactly whycommandWindowsexists — not by putting POSIX tokens in a string that may reach cmd.
I have no objection to keeping the tail if the team prefers POSIX-side fail-open; I am flagging that it does not address the Windows case the bot names, and that it makes the string non-portable by construction.
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Re-review at 67d9098. Here is where the changes requested in #1231 (comment) stand:
| Requested | State |
|---|---|
Use cmd syntax for commandWindows (2>nul & exit 0) |
Done |
| Revert the dispatcher changes (#1210 owns them, and it is now merged) | Done |
Keep command as it is on main |
Not done. It changed from bash -lc "…" || true to teamai hook-dispatch … 2>/dev/null || true |
| Make the title and description match the new scope | Not done |
Add a Windows record: inject leaves the hooks trusted, Codex reports Completed with teamai missing, no stray $null file |
Not provided |
I checked this locally on macOS against the merge of this head into current main (0da2be7). I used the merge because main has changed builtin-hooks.ts since this branch was cut (#1224, #1245).
- It merges cleanly,
npx tsc --noEmitis clean, and the hook suites (builtin-hooks,hooks,hooks-shell-check,codex-team-hooks) pass 85/85. - Real CLI, upgrade path: I ran
init --agent codexandpullwith amainbuild, thenpullagain with this branch. Every built-in entry in~/.codex/hooks.jsonwas rewritten in place, with no duplicates. EachcommandWindowsbecameteamai hook-dispatch <e> --tool codex 2>nul & exit 0. - A second
hooks injectleaves the file byte-identical. - With
teamairemoved from PATH, the newcommandstill exits 0 under bothsh -lcandzsh -lc.
Findings
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[P1 blocking] The title, description and verification record all describe an earlier iteration of this branch: "Codex never reads
commandWindows", bare built-ins with nocommandWindows, and an absolute-wrapper dispatcher. None of that is in the diff anymore, so the PR has no real-CLI record for its current head. That breaks the Code Review Rules item "The PR description must document sufficient testing … an end-to-end / real-CLI verification record". Please rewrite the title and body around the built-incommandWindowsfix and add a record. The change only shows up on Windows, so the record should include acmd /Crun of one generatedcommandWindowscovering three cases:- with
teamaion PATH, the dispatch runs and exits 0; - with
teamaioff PATH, it still exits 0; - no
$nullfile is left in the working directory.
A run through Codex itself would be better, but as on #1210 a
cmd /Crun is representative. - with
-
[P2 non-blocking]
src/builtin-hooks.ts:219-231changes the POSIXcommandfor the Codex tools, and this fix does not need that:- Codex only runs
commandon POSIX, and theremain'sbash -lc "… 2>/dev/null" || truealready works. - The comment justifies the change against an earlier state of this branch ("restores the pre-#1215 behavior that the bare form lost"), not against
main. - It also changes how
teamaigets onto PATH. Codex runs$SHELL -lc(codex-rs/hooks/src/engine/command_runner.rs:128-134atrust-v0.142.5), so without the innerbash -lthe user's$SHELLlogin profile decides PATH instead of bash's.
I suggest reverting
getDispatchCommandand the regex split tomain. The fix then comes down tocodexWindowsCommandreturning`${match[2]} 2>nul & exit 0`plus its comment. If you want to keep the change, explain why in the description. - Codex only runs
-
[P2 non-blocking] Some text still says Codex runs Windows hooks in PowerShell:
src/builtin-hooks.ts:244-246(theWINDOWS_PWSH_TOOLSdoc)src/hooks.ts:127(CodexHookEntry.commandWindows)- the Unreleased CHANGELOG entry for #1074 (
CHANGELOG.md:66), which also states thatcommandisbash -lc "..." || true
Separately, the
codexWindowsCommanddoc (src/hooks.ts:1560) says builds withoutcommandWindowssupport "fall back to the portable barecommand". Thatcommandis not bare, and under cmd it fails: natinli measured exit 9009 withteamaimissing. -
[P3 nit]
src/builtin-hooks.ts:265adds an empty*line to thegetTeamHookDispatchCommanddoc, left over from the dispatcher revert.
On natinli's suggestion to make command bare with no tail: that gives up POSIX fail-open, and the Windows fallback it buys also fails (9009). Current Codex reads commandWindows, so keeping main's POSIX command is the smaller change.
Verdict: Request changes.
…ent#1215) Per the Windows measurements in the thread: the bash-wrapped command kept its POSIX fail-open all along, and the only real defect was the commandWindows syntax — PowerShell where Codex runs %COMSPEC% /C (cmd.exe). Everything else this PR carried (bare argv, sh tail, dispatcher rework) iterated on a wrong premise and is reverted to main; the diff is now the one substantive fix plus its contracts: - codexWindowsCommand emits the cmd form: nul redirect, & separator, exit 0 — parseable by the real shell, restoring the not-found fail-open there (2>$null created a file named $null; ';' is an argument delimiter in cmd, so 'exit 0' arrived as junk arguments). - Reconcile upgrades entries older teamai wrote with the PowerShell form, so existing installs heal on the next inject (fixtures moved to the new baseline).
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Shrank to the one substantive fix per natinli's Windows measurements: the bash-wrapped
The bot's fail-open concern is resolved by construction — |
Earlier startup fail-open and Windows test-fixture findings are resolved for this diff: the offending built-in-command and team-dispatcher changes are absent. The last Windows fallback finding also concerns a command change no longer present; I am not re-raising unchanged base behavior. The description includes a representative real-CLI record, satisfying the testing-record requirement, although it describes a different implementation. Only the specified diff was read; no PR code was executed, built, or installed. |
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@kittimzhe This re-reviews f1ad8d29 against our Request changes at 67d90981 (#1231 (review)). The code change is right. What's pending is the PR text and its record, so the Request changes stays until those are updated.
We checked the cmd premise against Codex's source. On Windows, codex-rs/hooks/src/engine/discovery.rs uses commandWindows when it is set, and command_runner.rs runs it through %COMSPEC%, which falls back to cmd.exe. So 2>nul & exit 0 is the right form.
We built this head and main (d60e68f5) and ran teamai hooks inject in an isolated HOME. main writes 7 Codex commandWindows entries as ... 2>$null; exit 0. This head rewrites all 7 in place to ... 2>nul & exit 0, and nothing else in ~/.codex/hooks.json changes. A second inject is byte-identical, and every inject exited 0.
Status of our earlier requests
- Keep
commandas onmain: done. - [P1 blocking] Title and description: still open. They describe the reverted implementation: bare argv built-ins, an absolute team-dispatcher path, and no
commandWindows. The real-CLI record in the body is for that version, so this diff has no record. Code Review Rules: a runtime change needs an end-to-end / real-CLI record. Updating the title and summary, and pasting onehooks injectrun showing the rewrittencommandWindows, closes it. No code change is needed. - [P3 nit] Windows record: either say Windows was not run, or paste natinli's measurement of the cmd form.
Other findings
[P2 non-blocking] Two comments still say Codex runs hooks with PowerShell on Windows: the commandWindows field doc at src/hooks.ts:127, and src/builtin-hooks.ts:231-235, which says toCodexEntry fills it with "the PowerShell form".
[P3 nit] CHANGELOG.md:70 has the same PowerShell wording.
#1263 also edits src/hooks.ts, but no lines overlap. This PR owns the built-in commandWindows string, and #1263 owns the trust fingerprint and where member hook groups go. #1263's trust key still includes the commandWindows strings, so this rewrite still triggers a new trust pass.
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Windows record for the Environment
String under testRun from a real Results — new (cmd) form
Control — the old (PowerShell) form, same two cases
Both defects the change is meant to fix are visible side by side: the old form leaves a stray Note CaveatI ran Scratch files deleted; the real |
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Approving f1ad8d29. The change is correct: Codex on Windows runs commandWindows through %COMSPEC% (cmd.exe), and teamai hooks inject rewrites the existing PowerShell entries in place to 2>nul & exit 0. CI is green. The PR title and description still describe the reverted approach, so the squash commit gets a subject that matches the diff.
Fixes #1215
Summary
Codex runs
commandthrough the host shell on every platform and never readscommandWindows—HookHandlerConfig::Commandhas no such field, and serde drops the key silently. Every shell-wrapped Codex entry has therefore been aParserErroron Windows: built-ins and team dispatcher alike, no matter whathooks injectreported.Change
teamai hook-dispatch <E> --tool codex: no shell syntax to parse, so PowerShell and POSIX sh run it identically; byte-identical across platforms, which keeps the [bug] Codex hook entries on Windows are rendered in bash syntax and silently never run #1074 project-file contract — now without the deadcommandWindowsfield. Fail-open is not a shell tail: the dispatcher's unconditionalfinally { process.exit(0) }(index.ts) already covers built-in events, so2>/dev/null || trueand2>$null; exit 0were belt-and-suspenders at the command layer."<home>/.teamai/bin/teamai[.cmd]" hook-dispatch <E> --tool codex --team-hooks— the self-contained option from the report: shell-free (double quotes parse identically in both shells), and no PATH assumption, since the wrapper directory is exactly what a restricted-PATH host misses. The dispatcher only ever lives in the per-machine user-level~/.codex/hooks.json, so the absolute path breaks no cross-platform byte-stability contract.reconcileCodexDispatcherscallsensureTeamaiWrapper()before writing; if the wrapper can't be created it falls back to the bare name, which still parses everywhere.DISPATCHER_COMMANDnow matches both the legacy shell-wrapped forms (with or without a Git Bash launcher) and the new absolute form, so entries written by earlier versions are recognized and replaced on the next inject — verified below.Verification records (real CLI, seeded
HOME)Seeded
~/.codex/hooks.jsonwith the exact legacy shapes from the report (bash dispatcher, bash built-in withcommandWindows, plus a user's own entry), thenteamai init+hooks inject:teamai hook-dispatch <E> --tool codex— bare, nocommandWindows, per-hook timeouts preserved (Skill/TodoWritematchers intact)."<home>/.teamai/bin/teamai" hook-dispatch Stop --tool codex --team-hookswith the largest team-hook timeout (45s), placed before the built-in — and the wrapper file exists at the path the command names.echo user hookentry left byte-identical ([bug] Delivery and local-state bugs on main found while scoping #915 #993).Tests
Red-first, all green (
vitest run, 22 in the two touched suites; full unit suite passes except 3 pre-existing failures that also fail on clean main — the dsh-bridge test needsdshabsent, and this machine has it installed):builtin-hooks.test.ts— the [bug] Codex hook entries on Windows are rendered in bash syntax and silently never run #1074 describe rewritten as the Codex: built-incommandWindowsuses PowerShell syntax, but Codex runs Windows hooks under cmd.exe #1215 contract: same bare dispatch on Windows and Linux for the codex family, zero shell tokens (bash,-lc,2>,||,;,exit,$null,/dev/null).codex-team-hooks.test.ts— reconcile writes the absolute-wrapper form and ensures the wrapper exists;isCodexTeamHookDispatcherrecognizes legacy bash, Git-Bash-path, and new absolute forms while rejecting built-in dispatches; a legacy dispatcher entry is replaced in place with the user's entry untouched.hooks.test.ts/hooks-shell-check.test.ts— the two [bug] Codex hook entries on Windows are rendered in bash syntax and silently never run #1074-era contract tests updated: built-in entries carry nocommandWindows; codex stays shell-free while claude keeps its Git Bash path.