mkl-write-regression SKILL.md skillA

This file is byte-identical to the first copy the registry indexed, one of 3 indexed copies. Same content hash, so the same checks give both the same grade.

mkl-write-regression from 00200200/maintainer-skills-lab is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

mdr add 00200200/maintainer-skills-lab/mkl-write-regression@git:20260930.0130a77

Pins git:20260930.0130a77 in mdr.lock. Pin the fingerprint instead.

Audit grade

A, 17 of 17 checks passed

Kind

SKILL.md skill

Repository

00200200/maintainer-skills-lab

Path

providers/windsurf/.windsurf/skills/mkl-write-regression/SKILL.md

Versions recorded

1

Latest version

git:20260930.0130a77, committed Sep 30, 2026

Size

1,905 bytes

Repository stars

48

License

MIT

Write a focused regression test from an established bug reproduction and public behavior. Use when a fix needs a test that fails on the affected version; avoid mirroring the implementation or weakening assertions.

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

# Write a regression test

Read the reproduction, expected public behavior, and nearby test conventions. Derive the assertion from the behavior a caller needs, not from the proposed implementation.

Write the smallest test that captures the defect. Use deterministic inputs and existing project dependencies where practical. Do not mock away the faulty path. Place supporting fixtures beside the test and explain any environment requirements.

Run the test against the affected implementation before accepting it as a regression test. Use concise output flags (`pytest -q --tb=short -x`, or `python3 tools/test_fast.py`; unittest: `-q -f`) so failures stay readable instead of dumping full local-variable tracebacks. Inspect why it failed: an assertion about the reported behavior is evidence; an import error, collection failure, permission problem, or timeout is not the intended proof. Keep the test unchanged when evaluating the fix.

If the fix is already present, use an isolated checkout or an equivalent preserved baseline to test the pre-fix version. Preserve the user's current checkout and uncommitted work. Do not revert their working tree merely to get a red test.
…

Read the whole file at its exact version.

How to install

mdr add 00200200/maintainer-skills-lab/mkl-write-regression@sha256:117e37820fac511e

[![mdr](https://markdownregistry.com/badge/art_nskstxtuxilkultq.svg)](https://markdownregistry.com/a/art_nskstxtuxilkultq)

Versions

The registry has recorded 1 version of this file, committed on Sep 30, 2026.

Audit of the latest version

Source

API

GET https://markdownregistry.com/api/v1/artifacts/art_nskstxtuxilkultq
GET https://markdownregistry.com/api/v1/resolve?ref=00200200/maintainer-skills-lab/mkl-write-regression
GET https://markdownregistry.com/api/v1/blob/117e37820fac511e8894b53f5e7c05b33542433ae4ba5191d20495c61d6a7a69

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.

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