Two reproduced bugs in check-skill-version-bump:
- The origin/main-tip check fired even when the pushed skill was
byte-identical to main's tip, so a cherry-pick or backport failed a
push that ships nothing. The merge-base intersection ea119d8 added
covers that only when some base carries the content, which a
criss-cross history gives and a linear one does not. A new
same_subtree compares tree object ids, so the exemption holds
whatever route the history took.
- The failure line reported "baseline: none" when the skill was absent
at every merge-base but present at the tip, and the Fix: line then
named no version. The author writes the natural 1.0.0 and gets a
second blocked push. It now falls back to the tip's version.
ADR-0022 is not amended: the documented behaviour does not change, and
ea119d8 set the precedent by fixing the same failure class script-only.
1614bce verified that executables.allow grants are version-blind and
corrected ADR-0019, gates.md and apm.yml, but missed the gate script's
own header and its operator-facing FAIL message, which still told the
reader deployment was silently broken, and gates.md's hook summary,
which still called it a silent-failure guard. All three now match.
Also: README's offline guarantee carries the populated-apm_modules
condition gates.md and AGENTS.md already state; the scripts/ layout row
drops "sync" for the three deleted sync scripts; the check-rtk-prefix
README rationale names the 12 subdirectory READMEs that survive rather
than the skill-root ones this branch deleted; gates.md re-cites its
three head -1 sites by enclosing function per its own :238 rule; and
deploy-manifest drops a pointer to a provider-manifest.sh that has
never existed on main.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NwD8Egs5r4ndqeFLmhusX2
Why
Two suites failed intermittently — tests/test-vale-wrap.sh case 21 and
tests/test-check-release-needed.sh cases 4 and 15 — on correct output, and never
when run alone. The cause is the `echo "$OUT" | grep -q P` idiom under
`set -o pipefail`: grep -q exits as soon as it has an answer, bash's echo can
hand a multi-line value to the pipe one line at a time, and a write after the
reader is gone kills echo with SIGPIPE. pipefail then reports the writer's
death, so output that DID match reads as "no match". Every observed failure had
lines after its match; case 15's match is on line 1 of 6, the widest window in
that file.
Forced with a pause before the writer's last line, the pipe form failed 50 of 50
runs; a here-string, a match on the last line, and the same pipe without
pipefail each passed 50 of 50. Unforced the rate is about 1 per 670 suite runs,
which is why it read as a flaky gate rather than a bug.
The failures at review time are consistent with this, but were not proven to be
it: the suite was running while agents edited live config files in place, and a
brief change to .vale.ini or .pre-commit-hooks.yaml would produce the same two
failures. The race is real and fixed either way.
Implementation Notes
`grep -q P <<< "$VAR"` has no separate writer process, so there is nothing to
race. It is not a retry or a sleep. 121 sites converted across 9 files, three of
them scripts rather than tests: new-agent.sh, new-skill.sh and
check-executables-allow-sync.sh. None ships via .pre-commit-hooks.yaml, so no
external consumer pins them, and all three are single-pipeline checks whose
verdict cannot change.
Left alone deliberately: 14 sites whose writer is a command, not a shell
builtin — they either absorb the writer's status with `|| true` or are python3
and awk, which write once at exit — and one file with no pipefail. `printf '%s'`
sites differ from a here-string only by a trailing newline, which no -q verdict
on a non-empty pattern depends on.
tests/test-no-pipefail-early-exit-grep.sh is a static guard against new
occurrences, discovered automatically by run-tests.sh. It only scans files that
set pipefail, joins continuation lines, skips comments, and flags only
echo/printf writers. Its first case proves the scanner can fail before its
second trusts a clean verdict on the tree.
A guard covers exactly the spellings its regex models, so the miss surface was
measured rather than assumed. Four were found and closed: pipefail declared as
`set -o errexit -o pipefail` (where the old pattern required pipefail to follow
the FIRST -o, and a file-level miss skips every site in that file); a writer
separated from grep by an intermediate stage; a pipeline wrapped on a trailing
`|` rather than a backslash; and readers spelled egrep, fgrep, /bin/grep,
`command grep` or with an env-var prefix. Segment characters exclude a bare `&`
so `echo ok && other | grep -q x`, whose writer is `other`, does not false-fire.
Widening surfaced 5 live sites invisible to the original scanner, all in
tests/test-apm-current-hook.sh, all `echo "$out" | json_field ... | grep -q`;
they are safe today only because json_field is python3, which reads to EOF and
writes once. Fixtures go 4 to 12 vulnerable spellings plus near-miss negatives.
Two `grep ... | head -1` sites (test-vale-wrap.sh) are the same race with a
different early-exiting reader, and are fixed by absorbing the writer. The
scanner deliberately does not model `head`, `sed -n 1p` or a bare `read`: most
legitimate uses in this tree are already absorbed with `|| true` and the scanner
cannot see absorption from pipeline text, so a high false-positive rate would be
how this guard gets weakened. Heredoc bodies are scanned as code; none in the
tree trips it today.
Impact
The bug predates the factory-audit merge: every converted site in
check-release-needed and case 21 dates to 4d018af and aa8cc22 (2026-08-09).
Test suites go 19 to 20. `run-tests.sh --strict` passes 20/20 with 0 skipped,
four consecutive runs.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YR2CjVumUbEGWcMikcoXBD
Trim the two comment blocks that re-derived ADR-0019's argument in full
(apm's exact-dict-lookup key matching, and why the PyYAML fallback is not
a hard requirement) down to a short summary plus a pointer at ADR-0019,
which already carries that reasoning verbatim. 231 -> 222 lines.
The hook is kept, not deleted, per the audit's own corrected scope: the
"or drop it" option in SIMPLIFICATION-AUDIT.md finding #2 is off the
table because ADR-0019's Consequences section and the script's own
header both call this failure mode silent, and the ADR says a
silent-staleness failure here is strictly worse than the duplication
this repo's other gates catch.
The dual-reader design (PyYAML preferred, hand-rolled shape-scan
fallback) is also kept as-is: it exists specifically so a missing
python3/PyYAML can't silently skip the check or block every push, which
is exactly the loud-failure guarantee this finding must not weaken. No
genuine redundancy was found in the parsing logic, the per-branch
Why/Fix error messages (each tied to a specific test), or the test
matrix (which verifies the two readers agree across every failure mode)
without cutting something load-bearing -- so those are untouched, and
tests/test-check-executables-allow-sync.sh needed no changes since
script behavior and output are byte-identical.
All 23 tests in tests/test-check-executables-allow-sync.sh pass, and
`pre-commit run check-executables-allow-sync --all-files --hook-stage
pre-push` passes against the real repo state.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YR2CjVumUbEGWcMikcoXBD
apm approves a package's hooks and bin by an exact dictionary lookup on a
composed `name#version` key (apm_cli/security/executables.py,
is_package_approved). There is no wildcard and no version-less form, so
bumping plugins/kyberforge/apm.yml without editing root apm.yml's
`kyberforge#<version>` key errors nowhere: the entry stops matching, the
SessionStart hook stops deploying, and the install goes quietly stale.
ADR-0019 already named that as a live failure mode, mitigated only by a
comment in the executables block. This repo gates generated-content
drift, marketplace mirror drift and vale style drift deterministically,
and a silent-staleness failure is worse than any of them — a comment does
not survive the release that breaks it.
check-executables-allow-sync.sh parses the version out of the plugin
manifest and asserts the matching key exists in the root manifest. It
uses PyYAML where importable and falls back to a two-shape scan
otherwise, so a missing pip package cannot become the thing that blocks
every push; the test asserts both readers agree. 23 assertions.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01X7GvKuJfy2WrdBmUttV4DT
