testability-canary SKILL.md skillA
This file is byte-identical to the first copy the registry indexed. Same content hash, so the same checks give both the same grade.
testability-canary from thecolliery/coalmine is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add thecolliery/coalmine/testability-canary@git:20260922.b3be1e7Pins git:20260922.b3be1e7 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- thecolliery/coalmine
- Path
skills/testability-canary/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260922.b3be1e7, committed Sep 22, 2026
- First version recorded
- Aug 21, 2026
- Size
- 2,954 bytes
- Repository stars
- 14
- License
- Apache-2.0
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.
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
# Testability Canary (Decoupling & Mockability Audit) <!-- SHARED:LANGUAGE_HEADER --> Audit code to ensure it is decoupled, modular, and easy to cover with automated tests. ## Auditing Categories 1. **Hardcoded Constructors** — instantiating deps inside classes (`new DatabaseClient()`) instead of injecting via constructor/factory (prevents mocking). 2. **SRP Violations** — a class or method doing too many distinct duties (e.g. a service that also parses JSON and formats UI). 3. **Static Dependencies** — reliance on global static methods or Singletons that make test isolation impossible. 4. **Time & Environment Coupling** — direct `DateTime.Now`, `fs`, or `process.env` calls without an abstraction layer (fragile time/path-sensitive tests). 5. **Private Logic Gaps** — complex business logic hidden in private methods that can't be tested directly (extract to testable helpers). Per-stack patterns and the mock-strategy vocabulary: read `references/checks.md` before scanning. ## Fix mode (choice-gated) In Agent Context, after the report, present via `ask_question`: …
Read the whole file at its exact version.
How to install
mdr add thecolliery/coalmine/testability-canary@sha256:cab3f870c0608cc8The line at the top of this page pins the label git:20260922.b3be1e7, 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_bnmyiw7bxun2foxr)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 21, 2026 and Sep 22, 2026, about one every 8 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260922.b3be1e7 latest | 2026-09-22 | b3be1e7 | 2,954 B | A | view · diff |
| git:20260922.948eedb | 2026-09-22 | 948eedb | 2,932 B | A | view · diff |
| git:20260922.eb07a05 | 2026-09-22 | eb07a05 | 2,852 B | A | view · diff |
| git:20260821.c38e734 | 2026-08-21 | c38e734 | 2,781 B | A | view · diff |
| git:20260821.583c32b | 2026-08-21 | 583c32b | 2,631 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 (2954 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
thecolliery/coalmine · 14 stars · license Apache-2.0 · pushed 2026-10-19 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_bnmyiw7bxun2foxr GET https://markdownregistry.com/api/v1/resolve?ref=thecolliery/coalmine/testability-canary GET https://markdownregistry.com/api/v1/blob/cab3f870c0608cc8a93bd43fcc2cae12cec7916e35a92a54aea70b52ae904d76
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.
More from thecolliery/coalmine
Every file in thecolliery/coalmine