capability-signature-detection skillA
capability-signature-detection is agent-read markdown (skill) from fabioc-aloha/alex_skill_mall: Code-scanning regex that looks for literal strings misses real usage:.
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.
What the file says
# Capability Signature Detection
## The Problem
Code-scanning regex that looks for literal strings misses real usage:
```javascript
// First attempt: find files that use ".github/muscles/"
grep -rn '\.github/muscles/' . // Misses most actual usage!
// Because real code uses variables:
const musclePath = path.join(brainDir, 'muscles', name);
execFileSync('node', [musclePath]); // No literal string!
```
## The Solution
Detect the **capability signature**, not the literal text.
```javascript
// Instead of: "files containing '.github/muscles/'"
// Detect: "files that import child_process AND call execFileSync/spawn"
const hasCapability = (content) => {
const importsChildProcess = /require\(['"]child_process['"]\)|from ['"]child_process['"]/.test(content);
const callsExec = /exec(File)?Sync|spawn(Sync)?/.test(content);
return importsChildProcess && callsExec;
};
```
## Pattern Design
Ask: **"If a developer renames a path constant, would the test still find them?"**
| Approach | Survives Rename? | Use When |
|----------|------------------|----------|
| Literal string match | No | String IS the contract |
| Import + call pattern | Yes | Behavior IS the contract |
…Read the whole file at its exact version.
How to install
mdr add fabioc-aloha/alex_skill_mall/capability-signature-detection@git:20260728.80a7ab6mdr add fabioc-aloha/alex_skill_mall/capability-signature-detection@sha256:fca169cd005d2b49Pin 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.
[](https://markdownregistry.com/a/art_qyntz4pmqrvogiuw)
1 badge views in 30 days
Versions
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 (2488 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
fabioc-aloha/alex_skill_mall · 4 stars · license MIT · pushed 2026-09-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qyntz4pmqrvogiuw GET https://markdownregistry.com/api/v1/resolve?ref=fabioc-aloha/alex_skill_mall/capability-signature-detection GET https://markdownregistry.com/api/v1/blob/fca169cd005d2b497e625d783a0192f815b5f4a45952d1dc4558165524087c9e
Your agent 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.