code-quality-instruments SKILL.md skillA
This file is byte-identical to the first copy the registry indexed, one of 4 indexed copies. Same content hash, so the same checks give both the same grade.
code-quality-instruments from jakeselby/agent-harness is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jakeselby/agent-harness/code-quality-instruments@git:20260928.ca93e6dPins git:20260928.ca93e6d in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jakeselby/agent-harness
- Path
directory/model-citizen/primitives/skills/code-quality-instruments/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260928.ca93e6d, committed Sep 28, 2026
- Size
- 4,491 bytes
- Repository stars
- 24
- License
- MIT
Measure whether a test suite is any good, not only that it passes — branch coverage, mutation score, complexity-times-coverage risk, duplication. Use when adding or reviewing tests on a change that matters, a suite passes but a bug still shipped, coverage is high and confidence is not, or before promising a module is well tested.
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
The `testing` stance says whether tests are required. This is how you find out whether the ones you wrote are worth anything. A suite can reach full line coverage with no assertions at all. Every line executes, nothing is checked, and the gate is green. Coverage measures what ran; it does not measure what was verified. Everything below exists to close that gap. ## What to measure, in order of what it tells you 1. **Branch coverage, not line coverage.** Line coverage counts a two-way branch as covered when one side ran. Branch coverage is the cheapest upgrade available and usually the one that reveals the untested error path. 2. **Mutation score.** Change an operator, flip a boundary, delete a statement, then rerun the suite. A mutant that survives is a change to your code no test objects to. This is the only instrument here that measures assertions rather than execution, so it is the one that catches an assertion-free suite. 3. **Complexity against coverage.** A function that is both branchy and thinly covered is where defects concentrate. Either number alone is weak; the pair ranks the work. Robert Martin's CRAP …
Read the whole file at its exact version.
How to install
mdr add jakeselby/agent-harness/code-quality-instruments@sha256:3b734dd060b2787cThe line at the top of this page pins the label git:20260928.ca93e6d, 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_cbdcllay7lotxhne)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 28, 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 (4491 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
jakeselby/agent-harness · 24 stars · license MIT · pushed 2026-10-15 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_cbdcllay7lotxhne GET https://markdownregistry.com/api/v1/resolve?ref=jakeselby/agent-harness/code-quality-instruments GET https://markdownregistry.com/api/v1/blob/3b734dd060b2787c0afef8605956f70b174c2be854876dea420c50044fe6177a
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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