fix(gates): close the /name fail-open and stop the path guard inventing targets

Two defects in the routing-target resolver, both latent in the corpus but hot for
anything written next.

The free-standing `/name` sweep sat inside `if boundary:`, so route notation in a
sentence carrying no boundary marker was never extracted at all — not an ERROR, not
a SUGGESTION, not an INFO. That contradicted ADR-0020's amendment and gates.md,
which both promise `/name` blocks unconditionally. The sweep now runs over every
sentence. `-> name` and backticked forms stay gated deliberately: an arrow also
writes a process chain and a code span cites tools, files and skills alike, so
ungating either fires on ordinary prose.

The path guard used `\b`, which still holds after a hyphen, so the engine
backtracked to a shorter hyphen-terminated prefix whenever the lookahead rejected
the full segment. `/api-docs/v2.md` in a boundary clause raised blocking ERRORs for
'api' and 'api-docs' — names no author wrote, with no corroboration escape.
`(?![\w-])` forbids the shortened prefix outright; MARKED_TARGET, which had no
trailing guard at all, gained one.

Zero arguments now exits 2 rather than 0, so a mis-scoped `files:` pattern is no
longer indistinguishable from a clean corpus. Both hook manifests pass filenames
and pre-commit skips a filename-passing hook when nothing matches, so the hook
never sees an empty argv — that contract is now asserted by a test rather than
left in prose.

Deleting the sweep entirely used to leave every suite green. It now kills eight
assertions. The suite also gains its first slash-path and URL fixtures, in both
directions.

Refs: #107, #110, #124
ADR: 0020
This commit is contained in:
2026-09-01 12:37:12 +00:00
parent 971e148e19
commit 9fe734573d
9 changed files with 802 additions and 146 deletions

View File

@@ -106,40 +106,52 @@ BODY_MAX_WORDS=900
FAIL=0
for f in "$@"; do
# NOT a silent skip — see the matching note on the Python side. A broken
# symlink named SKILL.md is storable in git and a directory named SKILL.md
# reaches this hook the same way; both used to make the whole run exit 0 with
# no output at all, which is the one thing this script must never do.
if [[ ! -f "$f" ]]; then
if [[ -d "$f" ]]; then
why="is a directory, not a file"
elif [[ -L "$f" ]]; then
why="is a symlink that does not resolve to a file"
elif [[ -e "$f" ]]; then
why="is not a regular file"
else
why="does not exist"
fi
echo "ERROR: $f $why, so the line and word ceilings could not be measured. A path this hook was handed and could not read does not get to pass in silence." >&2
FAIL=1
continue
fi
# ZERO ARGUMENTS IS A USAGE ERROR, exit 2 — not a clean run.
#
# This hook is `pass_filenames: true` in both .pre-commit-config.yaml and
# .pre-commit-hooks.yaml, and pre-commit skips a filename-passing hook entirely
# when nothing matches its `files:` pattern, so it never invokes this script
# with an empty argument list. Every no-argument invocation therefore comes from
# somewhere else — a hand-run command, a wrapper, or a `files:` pattern edited
# into matching nothing — and printing nothing and exiting 0 made all three
# indistinguishable from a clean corpus. A mis-scoped pattern would have
# silently disabled the whole ADR-0020 gate family while every hook reported
# green.
#
# Exit 2, not 1, for the same reason a8cd5e8 split validate-adapter.sh's usage
# exits out: {0,1} are this script's verdict codes (clean / findings), and a
# caller that reads a non-zero exit as "the SKILL.md needs editing" must be able
# to tell a broken invocation from a real finding.
if [[ $# -eq 0 ]]; then
echo "usage: skill-size-check.sh <SKILL.md> [SKILL.md ...]" >&2
echo " Measures the agentskills.io spec ceilings and the ADR-0020 context" >&2
echo " budget for each SKILL.md named on the command line." >&2
echo " No paths were given. This is a usage error, not a clean run: a hook" >&2
echo " whose files: pattern matches nothing would otherwise be" >&2
echo " indistinguishable from a corpus with no findings." >&2
exit 2
fi
# The MAX_LINES / MAX_WORDS ceilings are NOT measured here. They used to be,
# in a single awk pass, and that pass was wrong twice over:
# * `read -r lines words <<< "$(awk ...)"` discarded awk's exit status, so a
# file awk could not read yielded empty variables, bash arithmetic read
# them as 0, and both ceilings passed in total silence — the one outcome
# this script forbids itself.
# * awk's NR/NF do not agree with the Python splitlines()/split() that
# skill-audit/scripts/validate.sh uses for the SAME two constants.
# splitlines() also breaks on \x0b \x0c \x1c \x1d \x1e \x85 U+2028 U+2029
# and split() on every Unicode space, so a body padded with U+2028 read as
# 6 lines here and 606 lines there — hook green, audit FAIL.
# One implementation now owns both: the Python block below already reads every
# file (with a real diagnostic on failure), so it counts there.
done
# An unreadable path — a broken symlink named SKILL.md is storable in git, and a
# directory named SKILL.md reaches this hook the same way — is diagnosed ONCE,
# in the Python per-file loop below. There used to be a bash pre-loop here doing
# exactly the same stat dance and printing exactly the same sentence, so every
# such path was reported twice with two ERROR lines for one broken file. It is
# still NOT a silent skip; the diagnosis simply lives where the file is read.
#
# The MAX_LINES / MAX_WORDS ceilings are not measured in bash either. They used
# to be, in a single awk pass, and that pass was wrong twice over:
# * `read -r lines words <<< "$(awk ...)"` discarded awk's exit status, so a
# file awk could not read yielded empty variables, bash arithmetic read
# them as 0, and both ceilings passed in total silence — the one outcome
# this script forbids itself.
# * awk's NR/NF do not agree with the Python splitlines()/split() that
# skill-audit/scripts/validate.sh uses for the SAME two constants.
# splitlines() also breaks on \x0b \x0c \x1c \x1d \x1e \x85 U+2028 U+2029
# and split() on every Unicode space, so a body padded with U+2028 read as
# 6 lines here and 606 lines there — hook green, audit FAIL.
# One implementation now owns both: the Python block below already reads every
# file (with a real diagnostic on failure), so it counts there.
if ! command -v python3 > /dev/null 2>&1; then
echo "ERROR: python3 is required for the ADR-0020 description/body/boundary-target gates but was not found on PATH." >&2
@@ -165,6 +177,23 @@ import sys
import yaml
# Output is UTF-8 for the same reason input is: under LC_ALL=C the streams
# default to ASCII, and this script's own message text carries em dashes (the
# ADR-0020 boundary SUGGESTION is one). Pinning only the reads moved the crash
# from the read to the write — a UnicodeEncodeError raised while PRINTING, after
# every check has already run, which loses the whole report. read_text() in the
# shared resolver block below pins the reads; this pins the writes.
#
# Deliberately OUTSIDE the ADR-0020 shared boundary resolver block: all three
# scripts in the family need this, but tests/test-adr0020-contract.sh hashes
# that block for byte-identity, so shared-looking edits belong beside it, not
# inside it.
for _stream in (sys.stdout, sys.stderr):
try:
_stream.reconfigure(encoding='utf-8')
except AttributeError: # pragma: no cover — Python < 3.7
pass
DESC_SUGGEST_CHARS = int(sys.argv[1])
DESC_MAX_CHARS = int(sys.argv[2])
BODY_SUGGEST_WORDS = int(sys.argv[3])
@@ -580,9 +609,9 @@ def known_targets(start_dir):
# ambiguity to resolve, and an author who wants a route checked unconditionally
# has two ways to say so.
#
# BOTH FORMS ARE SWEPT FOR ON THEIR OWN inside a boundary sentence, and that is
# a repair of the promise above rather than a widening of it. Until the sweeps
# existed, notation was only ever seen as the OBJECT OF A ROUTE VERB (`use
# BOTH FORMS ARE SWEPT FOR ON THEIR OWN, and that is a repair of the promise
# above rather than a widening of it. Until the sweeps existed, notation was
# only ever seen as the OBJECT OF A ROUTE VERB (`use
# /name`) or as the tail of a `not ... ->` clause with no `;` or sentence end in
# between. Every one of these therefore exited 0 in total silence — no ERROR, no
# SUGGESTION, not even the target's name:
@@ -593,6 +622,7 @@ def known_targets(start_dir):
# Do not use for Y — defer to /no-such-skill.
# Do not use for Y — /no-such-skill.
# Do not use for Y; -> no-such-skill covers it.
# For W, /no-such-skill is the right entry point.
# The target was never EXTRACTED, so the notation-first rule in _add() had
# nothing to apply itself to and the "always blocks" promise was false for the
# ordinary way an author writes the thing. The SUGGESTION tier made it worse
@@ -601,12 +631,43 @@ def known_targets(start_dir):
# visible SUGGESTION into silence — the gate teaching the one edit that blinds
# it.
#
# The sweeps are gated on the sentence carrying a BOUNDARY_MARKER, the same gate
# the backtick sweep uses, and NOTATION_SLASH refuses a token that is part of a
# PATH: a following `/`, or a `.` followed by a non-space, means
# `references/foo.md`, `docs/a/b.md` or `https://x/y`, not a route. A sentence's
# closing `.` is not followed by a non-space, so `— /no-such-skill.` still
# counts.
# THE TWO SWEEPS ARE GATED DIFFERENTLY, and the asymmetry is the whole point.
# `/name` is Claude Code's invocation syntax and nothing else — no English
# sentence contains one by accident — so the ADR-0020 amendment and
# docs/spec/gates.md both promise it blocks UNCONDITIONALLY, for any name. So
# NOTATION_SLASH is swept over every sentence, boundary marker or not. Gating it
# on BOUNDARY_MARKER made that promise false for the last sentence of
# Do not use for Z — use /real-skill instead.
# For W, /no-such-skill is the right entry point.
# which exited 0 in total silence: the boundary clause is one sentence up, so
# the sweep never looked at the sentence carrying the broken route. Extraction is
# per-sentence by design (corroboration is scoped to one sentence), which is
# exactly what made the gap invisible.
#
# NOTATION_ARROW stays gated on BOUNDARY_MARKER, and so does the backtick sweep.
# Neither form is unambiguous: `-> name` is also how a process chain is written
# ("reproduce -> minimise -> regression-test") and a code span is how a tool, a
# file and a skill are all cited. Ungating either would fire on prose that
# carries no routing intent at all — the false-positive class this whole
# extractor is tuned against.
#
# BOTH `/name` PATTERNS REFUSE A TOKEN THAT IS PART OF A PATH: a following `/`,
# or a `.` followed by a non-space, means `references/foo.md`, `docs/a/b.md` or
# `https://x/y`, not a route. A sentence's closing `.` is not followed by a
# non-space, so `— /no-such-skill.` still counts.
#
# THAT GUARD IS WRITTEN `(?![\w-])` AND NOT `\b`, because `\b` is not a guard at
# all here: it holds after a hyphen, so when the trailing lookahead rejected the
# full segment the engine simply backtracked to a shorter hyphen-terminated
# prefix and reported THAT as a route. Every one of these was a hard blocking
# ERROR naming a skill nobody had written:
# the config lives at /opt-tools/bin/thing. -> 'opt'
# see /api-docs/v2.md for the schema. -> 'api' AND 'api-docs'
# the file /no-such-skill.md documents it. -> 'no-such'
# `(?![\w-])` forbids the shortened prefix outright, so the whole segment is
# rejected as the path it is. MARKED_TARGET carries the same guard: it had no
# trailing lookahead whatsoever, so `see /api-docs/v2.md` raised the second of
# the two errors above through the route-verb path rather than the sweep.
#
# NAMESPACE: `plugin:skill` is live in this repo (native user-scope installs
# still resolve `gitea:gitea-prs`), so the patterns admit an optional
@@ -618,7 +679,8 @@ ROUTE_VERB = (r"(?:use|uses|using|run|runs|invoke|invokes|invoking|try|see"
r"|that'?s|compose|composes|call|calls"
r"|routes?\s+to|delegates?\s+to|prefers?|switch(?:es)?\s+to"
r"|hands?\s+off\s+to)")
MARKED_TARGET = r"(?:`/?(%s)`|(?<![\w./*-])/(%s)\b)" % (NAME_ANY, NAME_ANY)
MARKED_TARGET = (r"(?:`/?(%s)`|(?<![\w./*-])/(%s)(?![\w-])(?!/|\.\S))"
% (NAME_ANY, NAME_ANY))
ANY_TARGET = r"(?:%s|(%s)\b)" % (MARKED_TARGET, NAME_HYPH)
ROUTE_MARKED = re.compile(r"\b%s\s+(?:the\s+|an?\s+)?%s" % (ROUTE_VERB, MARKED_TARGET), re.I)
ROUTE_ANY = re.compile(r"\b%s\s+(?:the\s+|an?\s+)?%s" % (ROUTE_VERB, ANY_TARGET), re.I)
@@ -631,10 +693,12 @@ ROUTE_ANY = re.compile(r"\b%s\s+(?:the\s+|an?\s+)?%s" % (ROUTE_VERB, ANY_TARGET)
CONT_MARKED = re.compile(r"\s*(?:or|and|/|,)\s*%s" % MARKED_TARGET, re.I)
CONT_ANY = re.compile(r"\s*(?:or|and|/|,)\s*%s" % ANY_TARGET, re.I)
ARROW_MARKED = re.compile(r"(?:->|→)\s*%s" % MARKED_TARGET, re.I)
# The two EXPLICIT ROUTE NOTATION sweeps, scoped to a boundary sentence by their
# caller. NOTATION_SLASH is deliberately not a reuse of MARKED_TARGET's `/name`
# alternative: that one only ever runs behind a route verb or an arrow, and the
# trailing lookahead here is the part that makes a FREE-STANDING sweep safe.
# The two EXPLICIT ROUTE NOTATION sweeps. NOTATION_SLASH runs over EVERY
# sentence; NOTATION_ARROW is scoped to a boundary sentence by its caller (see
# the asymmetry note in the header). NOTATION_SLASH is deliberately not a reuse
# of MARKED_TARGET's `/name` alternative: that one only ever runs behind a route
# verb or an arrow, and it may match a namespaced or path-adjacent token in
# positions this free-standing sweep must refuse.
# NOTATION_ARROW is ARROW_BOUNDARY minus its leading `\bnot\b%s*?`, which is
# what made `Do not use for Y; -> no-such-skill covers it.` invisible:
# CLAUSE_BODY cannot cross the `;`, so the clause's own punctuation disarmed the
@@ -646,7 +710,8 @@ ARROW_MARKED = re.compile(r"(?:->|→)\s*%s" % MARKED_TARGET, re.I)
# hard ERROR under ARROW_BOUNDARY, so this changes which boundary words reach the
# arrow, not whether prose can. An author who means the chain and not a route
# writes it in its own sentence, where neither pattern looks.
NOTATION_SLASH = re.compile(r"(?<![\w./*-])/(%s)\b(?!/|\.\S)" % NAME_ANY, re.I)
NOTATION_SLASH = re.compile(
r"(?<![\w./*-])/(%s)(?![\w-])(?!/|\.\S)" % NAME_ANY, re.I)
NOTATION_ARROW = re.compile(r"(?:->|→)\s*(%s)\b" % NAME_HYPH, re.I)
# CLAUSE_BODY is what may sit between `Not` and the arrow, and it is NOT
# `[^.;]`. That class cannot cross a `.`, so every boundary clause naming a
@@ -822,14 +887,16 @@ def _extract_sentence(sentence):
for match in ARROW_BOUNDARY.finditer(sentence):
_add(out, sentence, match.group(1), match.start(1), match.end(1),
strict=True, arrow=True)
# `/name` wherever it sits, in ANY sentence — not only where a route verb or
# an arrow happens to precede it, and NOT only inside a boundary sentence.
# See the EXPLICIT ROUTE NOTATION note in the header for the eight phrasings
# this recovers and for why silence was the failure mode. The sweep takes no
# follower test: _add() reads the notation first and marks it.
for match in NOTATION_SLASH.finditer(sentence):
_add(out, sentence, match.group(1), match.start(1), match.end(1))
if boundary:
# Route notation wherever it sits in the clause, not only where a route
# verb or an arrow happens to precede it. See the EXPLICIT ROUTE
# NOTATION note in the header for the seven phrasings this recovers and
# for why silence was the failure mode. Neither sweep takes the follower
# test: _add() reads the notation first and both forms reach it marked.
for match in NOTATION_SLASH.finditer(sentence):
_add(out, sentence, match.group(1), match.start(1), match.end(1))
# The arrow and backtick forms are ambiguous in ordinary prose, so they
# stay scoped to a sentence that carries a boundary marker.
for match in NOTATION_ARROW.finditer(sentence):
_add(out, sentence, match.group(1), match.start(1), match.end(1),
strict=True, arrow=True)
@@ -1228,7 +1295,9 @@ for path in files:
# so pre-commit really can hand one to this hook, and a directory named
# SKILL.md reaches it the same way — both used to exit 0 with zero
# output, which is precisely the "stay quiet about a measurement it did
# not take" failure this script forbids itself two screens up.
# not take" failure this script forbids itself two screens up. This is
# the ONLY place that diagnosis is made; the bash pre-loop that used to
# duplicate it printed a second ERROR line for the same broken file.
if os.path.isdir(path):
why = "is a directory, not a file"
elif os.path.islink(path):
@@ -1250,8 +1319,8 @@ for path in files:
# SPEC CONFORMANCE (family 1). Whole file, frontmatter included, counted
# with the SAME primitives skill-audit/scripts/validate.sh uses for these
# two constants — see the note in the bash loop above for what the previous
# awk pass got wrong.
# two constants — see the note in bash above for what the previous awk pass
# got wrong.
lines = len(raw.splitlines())
words = len(raw.split())
if lines > MAX_LINES: