scale-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.
scale-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/scale-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/scale-canary/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260922.b3be1e7, committed Sep 22, 2026
- First version recorded
- Aug 7, 2026
- Size
- 2,784 bytes
- Repository stars
- 14
- License
- Apache-2.0
Performance complexity and resource allocation canary — checks for O(N^2) loops, database N+1 query patterns, memory leaks (unbounded collections), and blocking calls in main event loop. Triggers on keywords: "/scale-canary", "scale-canary", "performance audit", "scale audit". Use when writing loops over growing data, DB queries, caches, or async/event-loop code.
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
# Scale Canary (Performance & Resource Allocation Audit) <!-- SHARED:LANGUAGE_HEADER --> Audit code for scalability issues, performance bottlenecks, and resource leaks. ## Auditing Categories 1. **O(N^2) Complexity** — nested loops over growable collections without indexing or caching (crashes at scale). 2. **N+1 Database Queries** — querying records in a loop instead of a batch JOIN or bulk prefetch. 3. **Memory Bloat / Leaks** — appending to global arrays/maps without clearing them → unbounded growth. 4. **Blocking Main Loop** — synchronous FS ops or CPU-heavy work on the main event thread (lag/hangs). 5. **Resource Leakage** — streams, connections, or handles left open without a `finally` close. Per-ORM N+1 shapes, per-stack blocking patterns, and what NOT to flag: 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/scale-canary@sha256:1d6a1c89eff0fe88The 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_egscvcq3ppheocjo)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Aug 7, 2026 and Sep 22, 2026, about one every 11 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260922.b3be1e7 latest | 2026-09-22 | b3be1e7 | 2,784 B | A | view · diff |
| git:20260922.eb07a05 | 2026-09-22 | eb07a05 | 2,691 B | A | view · diff |
| git:20260821.c38e734 | 2026-08-21 | c38e734 | 2,611 B | A | view · diff |
| git:20260821.583c32b | 2026-08-21 | 583c32b | 2,461 B | A | view · diff |
| git:20260807.4ab4ef9 | 2026-08-07 | 4ab4ef9 | 2,082 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 (2784 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_egscvcq3ppheocjo GET https://markdownregistry.com/api/v1/resolve?ref=thecolliery/coalmine/scale-canary GET https://markdownregistry.com/api/v1/blob/1d6a1c89eff0fe8841bdddfce0deffcedcd2d5633215880f23f50ea22748fd0f
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