lythoskill-coach SKILL.md skillA
lythoskill-coach from lythos-labs/lythoskill is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add lythos-labs/lythoskill/lythoskill-coach@{{PACKAGE_VERSION}}Pins {{PACKAGE_VERSION}} in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lythos-labs/lythoskill
- Path
packages/lythoskill-coach/skill/SKILL.md- Versions recorded
- 5
- Latest version
- {{PACKAGE_VERSION}}, committed Sep 9, 2026
- First version recorded
- May 3, 2026
- Size
- 11,872 bytes
- Repository stars
- 3
- License
- MIT
Analyzes SKILL.md files against Agent Skills best practices. Reviews body size, description quality, progressive disclosure, frontmatter usage, and context efficiency. Provides actionable optimization advice.
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
# Skill Optimization Coach You are a skill quality reviewer. When asked to analyze or improve a SKILL.md, evaluate against the criteria below and provide specific, actionable feedback. ## Evaluation Criteria ### 1. Body Size **Target**: <500 lines, <5000 tokens. After compaction, Claude Code keeps only the first 5,000 tokens per skill. All re-attached skills share a combined 25,000-token budget. A 15,000-token skill body loses 2/3+ of its content after the first compaction. **Fix**: Move reference material to `references/` files. Keep only operational instructions and gotchas in the body. ### 2. Description + when_to_use **Target**: Combined <1,536 characters (hard truncation by Claude Code). All skill descriptions share a budget of 1% of the context window (fallback: 8,000 characters). With many skills, each gets very little space. **Community reality** (cold pool sample, May 2026): 579 skills scanned. `when_to_use` appears in 16 (2.8%) — all lythoskill's own. 0 of 563 community skills use it, including Anthropic's own published skills (pdf, docx, frontend-design, skill-creator). This is genuinely odd: Claude Code officially documents `when_to_use` as the field …
Read the whole file at its exact version.
How to install
mdr add lythos-labs/lythoskill/lythoskill-coach@sha256:78d42eb112eb23d0The line at the top of this page pins the label {{PACKAGE_VERSION}}, 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_hx6wmuqzu2w7rzyf)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between May 3, 2026 and Sep 9, 2026, about one every 32 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| {{PACKAGE_VERSION}} latest | 2026-09-09 | bc2053c | 11,872 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-09-09 | c3edaf7 | 11,873 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-28 | 7f02285 | 11,840 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-28 | 9287680 | 11,054 B | A | view · diff |
| {{PACKAGE_VERSION}} | 2026-05-03 | 988a0a6 | 11,046 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 (11872 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
lythos-labs/lythoskill · 3 stars · license MIT · pushed 2026-10-31 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_hx6wmuqzu2w7rzyf GET https://markdownregistry.com/api/v1/resolve?ref=lythos-labs/lythoskill/lythoskill-coach GET https://markdownregistry.com/api/v1/blob/78d42eb112eb23d0871d905edd023e9c249832993e5680a72912b96449e13a04
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.
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