valid-skill is agent-read markdown (skill) from muselinn/musepi: A valid skill for testing purposes..
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
# Valid Skill
This is a valid skill that follows the Agent Skills standard.
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.
B 16 of 17 checks passed. Deterministic, no model, same answer every run.
fail: Size between 200 bytes and 200 KB (153 bytes)
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
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
muselinn/musepi · 17 stars · license MIT · pushed 2026-09-23 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_p4kcpamybi4tw6bx
GET https://markdownregistry.com/api/v1/resolve?ref=muselinn/musepi/valid-skill
GET https://markdownregistry.com/api/v1/blob/db6af8bf9364290c5376d39e97c622f0152b6cd64f379bc03855d79ea058c0ba
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.
muselinn/musepi · .musepi/skills/tool-prompt-optimization/SKILL.md · Optimize the description prompts an AI agent reads to learn its built-in tools (the `.md` files under prompts/tools/)…
dicklesworthstone/pi_agent_rust · legacy_pi_mono_code/pi-mono/packages/coding-agent/test/fixtures/skills/valid-skill/SKILL.md · A valid skill for testing purposes.
first-fluke/oh-my-agent · cli/platform/emit/__fixtures__/repo/.agents/skills/valid-skill/SKILL.md · A minimal, fully spec-conformant fixture skill used to exercise the happy path.
hidorakai002/ai-workspace-archive · ai_agent_frameworks/major_frameworks/crewAI/lib/crewai/tests/skills/fixtures/valid-skill/SKILL.md · A complete test skill with all optional directories.
