hetcreep/coalmine · plugin/skills/testability-canary/SKILL.md

testability-canary skillA

testability-canary is agent-read markdown (skill) from hetcreep/coalmine: Testability and design decoupling canary — checks for tight coupling, lack of Dependency Injection (DI), hardcoded constructors, Single Responsibility Principle (SRP) violations, and mockability gaps. Triggers on keywords: "/testability-canary", "testability-canary", "testability audit", "decoupling". Use when refactoring coupling, introducing DI, or making code unit-testable..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add hetcreep/coalmine/testability-canary@git:20260903.0a4f5d3
Exact content
mdr add hetcreep/coalmine/testability-canary@sha256:b2571e5f66cd0123

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_mpw2rdtpcb3o5tkc.svg)](https://markdownregistry.com/a/art_mpw2rdtpcb3o5tkc)

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Versions

versioncommittedcommitsizeaudit
git:20260903.0a4f5d3 latest2026-09-03 0a4f5d3 8,342 BA view · diff
git:20260903.62a3b912026-09-03 62a3b91 8,286 BA view · diff
git:20260821.c38e7342026-08-21 c38e734 7,990 BA view · diff
git:20260821.583c32b2026-08-21 583c32b 7,840 BA view · diff
git:20260808.de45ab02026-08-08 de45ab0 6,760 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (8342 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

GitHub

hetcreep/coalmine · 13 stars · license Apache-2.0 · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_mpw2rdtpcb3o5tkc
GET https://markdownregistry.com/api/v1/resolve?ref=hetcreep/coalmine/testability-canary
GET https://markdownregistry.com/api/v1/blob/b2571e5f66cd0123157440983bcdee57ec6252acfe9d6bdf3b8816bd55fd842b

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.