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Read-only drift detector.

Skill by JuliusBrussee

IndexedMIT★ 1,157
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Works with Claude Code, Claude apps, Codex, Cursor, Gemini CLI, GitHub Copilot, VS Code, OpenCode, Goose, Windsurf. Read the repository before you give any tool access to your data.

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About

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".

Use cases: security

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Permissions

What this skill can do and what it asks for, from its SKILL.md. Checked Oct 25, 2026.

Tools
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Secrets
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Install scripts
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Network hosts it talks to 1

  • codeload.github.com · found in install command

Files it touches

  • ~/.claude/skills/check

What's inside

Skill name
check
Description
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".
License
MIT
Instructions
84 lines in SKILL.md · view on GitHub

Files (1)

  • SKILL.md

SKILL.md (first lines)

# 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.

From JuliusBrussee/cavekit, MIT.

Signals

Stars
1,157
Forks
89
Open issues
12
Last commit (this folder)
Jun 18, 2026 (4 months ago)
Last release
Apr 18, 2026 (6 months ago)

From GitHub (fetched Oct 24, 2026).

Details

License
MIT
First seen
Oct 24, 2026
Last checked
Oct 24, 2026

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Cite this page

check skill. Agent Mart. https://agentmart.dev/skills/juliusbrussee-check (last updated 2026-10-24)