goodskill SKILL.md skillA
goodskill from haabe/mycelium is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add haabe/mycelium/goodskill@git:20260523.7ad21caPins git:20260523.7ad21ca in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- haabe/mycelium
- Path
tests/bash/fixtures/check_31/present/plugins/mycelium/skills/goodskill/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260523.7ad21ca, committed May 23, 2026
- Size
- 520 bytes
- Repository stars
- 51
- License
- MIT
Test fixture skill that writes to canvas AND carries the Preflight block. Check 31 must pass.
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
# Good Skill This skill writes to `.claude/canvas/purpose.yml` (Update canvas/purpose.yml). ## Preflight: Read target canvas file Before any canvas write, this skill reads the target file first per the Read-before-Write hard rule (anti-pattern #7 instance #5 prevention). ``` Read .claude/canvas/purpose.yml (limit: 1 for Edit, full Read for Write) ``` Then proceeds with the write.
Read the whole file at its exact version.
How to install
mdr add haabe/mycelium/goodskill@sha256:0d73eaf20d6fe15bThe line at the top of this page pins the label git:20260523.7ad21ca, 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_vako3ybuqgu23ihd)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 23, 2026.
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 (520 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
haabe/mycelium · 51 stars · license MIT · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_vako3ybuqgu23ihd GET https://markdownregistry.com/api/v1/resolve?ref=haabe/mycelium/goodskill GET https://markdownregistry.com/api/v1/blob/0d73eaf20d6fe15b92dec2668922ae7e3597c991f27a2e45c0aa02162d51a389
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.