bug-reproduction SKILL.md skillA
bug-reproduction from petrkindlmann/qa-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add petrkindlmann/qa-skills/bug-reproduction@v1.0Pins v1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- petrkindlmann/qa-skills
- Path
skills/bug-reproduction/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0, committed Jun 10, 2026
- Size
- 23,283 bytes
- Repository stars
- 198
- License
- MIT
Turn a vague bug report into a VERIFIED minimal reproduction and then a failing regression test, agent-driven end to end. Covers extracting the implicit repro from a thin report (env, build, steps, data), the reproduce-minimize-isolate-capture loop, git bisect to find the introducing commit, building a deterministic minimal repro (fixed seeds, frozen time, stubbed network), writing the failing regression test BEFORE the fix (red) and confirming the fix flips it green, and writing repro…
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
<objective>
A bug you cannot reproduce is a bug you cannot fix or prove fixed. This skill takes a
thin, hand-wavy report ("order total is wrong sometimes") and drives it to a VERIFIED
minimal reproduction, a deterministic failing test written BEFORE the fix, a `git bisect`
that names the introducing commit, and a structured evidence block in the ticket. The
discipline it enforces: reproduce before theorizing, minimize one cut at a time, freeze
time/seed/network so the repro fails identically every run, watch the test go red first,
and confirm the fix flips it green — and that reverting the fix turns it red again.
</objective>
## Quick Route
| You have… | Go to |
|-----------|-------|
| A thin report and no idea how to trigger it | [Step 1: Extract the implicit repro](#step-1-extract-the-implicit-repro) |
| A messy 14-step repro to clean up | [Step 2: The reproduce-minimize-isolate-capture loop](#step-2-the-reproduceminimizeisolatecapture-loop) |
| "Worked last month, broken now" | [Step 3: Bisect to the introducing commit](#step-3-bisect-to-the-introducing-commit) |
…Read the whole file at its exact version.
How to install
mdr add petrkindlmann/qa-skills/bug-reproduction@sha256:617d59812df6cc3aThe line at the top of this page pins the label v1.0, 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_syv3syhkcinhzwgr)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jun 10, 2026.
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 (23283 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
petrkindlmann/qa-skills · 198 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_syv3syhkcinhzwgr GET https://markdownregistry.com/api/v1/resolve?ref=petrkindlmann/qa-skills/bug-reproduction GET https://markdownregistry.com/api/v1/blob/617d59812df6cc3a5ca5d6962b3de75f1ada6e9886dca170017ed48b8b64379b
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.