SECURITY REVIEW
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Testing · Documentation / AGENT SKILL
check
0
Compare SPEC.md with code and report specification drift and invariant violations by severity.
Read-only drift detector. Diffs SPEC.md against current code and reports
violations grouped by severity. Writes nothing — suggests remedies via
the spec or build skills but never invokes them. Triggers when the user
asks to check drift, audit the spec, verify invariants, or ask whether
code still matches the spec. Phrasings: "check drift", "audit the spec",
"does the code still match §V", "check invariants", "spec vs code".
Understand the trade-offs.
SKILL QUALITY
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How clearly the skill guides your agent, how complete its workflow is, and how you can check the outcome.
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The full skill.
Original instructions from the publisher’s SKILL.md
# check — drift report
Pure diagnostic. Reports violations. Writes nothing. User decides remedy.
Spec drifting silently from code is the #1 SDD failure mode. check is the
detector. Run it after each `/build` and before each ship — drift caught here is
a diff; drift caught in prod is a §B.
## LOAD
1. Read `SPEC.md`. If missing → "no spec, nothing to check." Stop.
2. Parse invocation args:
- `§V` → check invariants only (default)
- `§I` → check interfaces
- `§T` → audit task status vs code
- `--all` → all three
## CHECK §V — invariants
For each V<n>:
1. Translate invariant into verifiable claim about code.
2. Grep / read relevant files.
3. Classify: **HOLD** / **VIOLATE** / **UNVERIFIABLE**.
4. Record address + file:line evidence.
## CHECK §I — interfaces
For each I item:
1. Locate implementation.
2. Classify:
- **MATCH** — shape in code = shape in spec.
- **DRIFT** — impl exists, shape differs.
- **MISSING** — impl absent.
- **EXTRA** — code exposes surface not in §I.
## CHECK §T — tasks
For each T<n>:
1. If `x`: verify claimed work present.
2. If `~`: note as in-progress.
3. If `.`: note as pending.
4. Flag `x` rows with no evidence as **STALE**.
## REPORT
Caveman. Grouped by severity.
```
## §V drift
V2 VIOLATE: auth/mw.go:47 uses `<` not `≤`. see §B.1.
V5 UNVERIFIABLE: no test covers ∀ req path.
## §I drift
I.api DRIFT: POST /x returns `{result}` not `{id}`. route.go:112.
I.cmd MISSING: `foo bar` absent from cli/*.go.
## §T drift
T3 STALE: status `x`, no middleware file exists.
## summary
2 violate. 1 missing. 1 stale. 1 unverifiable.
next: spec skill with `bug:` or fix code at cited lines.
```
## REMEDY HINTS (not actions)
End report with one-line hint per class:
- VIOLATE / DRIFT → invoke spec skill `bug: <V.n>` or fix code.
- MISSING → invoke build skill on `§T.n` if task exists; else spec skill `amend §T`.
- STALE → spec skill `amend §T` to uncheck.
- EXTRA → spec skill `amend §I` to document, or delete code.
Never invoke fixes. Report only.
## NON-GOALS
- Zero writes. No SPEC.md edits. No code edits.
- No sub-agents. Main thread reads.
- No scores, no grades. Binary per item: holds or drifts.