Narrowing has_reference to bool(import_lines) meant a UTF-8 BOM hid the import
line, since the BOM is not \s: a CLAUDE.md whose first line is @AGENTS.md failed
with 'no reference to AGENTS.md' and was told to add the line already in front of
it. Decoding is now strict too, so a non-UTF-8 adapter gets an encoding
diagnostic instead of being mangled and then graded on the mangling.
Usage errors move to exit 2. They shared exit 1 with real findings, while the
skill tells the agent to fix any non-zero exit by editing the provider file.
The whole-line import rule is kept deliberately -- accepting an inline @AGENTS.md
would also accept one inside backticks, which is the silent-drop failure the
validator exists to catch -- and the message now says so.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EJJrm5YmacbwMdzZpXcoti
Description 833 -> 239 chars, body 370 -> 387 words, Gotchas 41% -> 20%.
The file-type enumeration moves to a new references/provider-matrix.md;
the composition note was already in README.md.
Three defects a clean-context audit found, all fixed:
The 'never edits AGENTS.md' prohibition had become a justification clause
on the false branch of a conditional, so the common path never read a
sentence binding it. That matters because the bundled validator's own
remediation text tells the agent to move content into AGENTS.md, so a
size FAIL actively invited the prohibited edit. Restored as a standing
imperative, plus a counter at the step where the trap fires.
A Gotcha asserted that validate-adapter.sh fails without
--no-import-syntax. The flag is a no-op -- both branches reduce to the
same expression. Reverted to an instruction; the script defect is #115.
The boundary clauses used pronouns to dodge the #110 regex, and 'Not
auditing it' resolved to CLAUDE.md as readily as to AGENTS.md -- routing
'audit my CLAUDE.md' to a skill whose own description declines it.
Refs #99
Converts a target repo's provider-specific instruction file (CLAUDE.md,
.cursor/rules, copilot-instructions.md, etc.) into a thin adapter over
AGENTS.md, mirroring this repo's own two-tier CLAUDE.md pattern
(ADR-0002/0003). Self-validates via a bundled deterministic script
(scripts/validate-adapter.sh) rather than a separate paired audit skill.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
