red-first-review SKILL.md skillA
red-first-review from tonydzi/second-brain-starter-kit is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add tonydzi/second-brain-starter-kit/red-first-review@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- tonydzi/second-brain-starter-kit
- Path
skills/red-first-review/SKILL.md- Versions recorded
- 5
- Latest version
- v1.0.0, committed Oct 20, 2026
- First version recorded
- Sep 24, 2026
- Size
- 7,553 bytes
- Repository stars
- 14
- License
- MIT
Review someone else's pull request by measuring which of its own guards its own test suite actually catches, via a small mutation matrix. Use when reviewing a PR, checking whether a regression test is real, or asked 'is this change actually tested?', 'does this test do anything', 'mutation test this'.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Red-first review A test that has never been shown failing is a claim, not a check. This skill turns that claim into a measurement: break the thing the test is supposed to protect, and see whether anything goes red. Applied to someone else's pull request it answers one question a human reviewer cannot answer by reading: **which of the guards this PR adds would survive being deleted?** Those are the ones the author will regress next month without noticing. ## When to use it - reviewing a PR that adds a guard, a validation, a sanitiser, a redaction, a permission check — anything that says "no" on some paths - someone claims a fix is covered by tests, and you want that claim measured - you wrote a regression test yourself and want to prove it fails without the fix - auditing a test file that has never failed in CI Not for: pure refactors with no behavioural claim, docs, dependency bumps. ## The procedure ### 0. Read the whole files, not the diff The diff shows what changed. The bug is usually in what did not. Open every touched source file end to end, and specifically look for **sibling call sites**: …
Read the whole file at its exact version.
How to install
mdr add tonydzi/second-brain-starter-kit/red-first-review@sha256:989c26882190e448The line at the top of this page pins the label v1.0.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ycel6spjmc2q3raf)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Sep 24, 2026 and Oct 20, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-10-20 | 402f6b7 | 7,553 B | A | view · diff |
| v1.0.0 | 2026-10-07 | cd6c208 | 7,559 B | A | view · diff |
| v1.0.0 | 2026-10-05 | b413266 | 7,560 B | A | view · diff |
| v1.0.0 | 2026-10-03 | a2d662f | 7,590 B | A | view · diff |
| v1.0.0 | 2026-09-24 | 2784cb2 | 6,475 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7553 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
tonydzi/second-brain-starter-kit · 14 stars · license MIT · pushed 2026-11-06 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_ycel6spjmc2q3raf GET https://markdownregistry.com/api/v1/resolve?ref=tonydzi/second-brain-starter-kit/red-first-review GET https://markdownregistry.com/api/v1/blob/989c26882190e448119a43716fe49819824d3771280052722903fd3b0f20921d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.