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.