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@v0.21.0Pins v0.21.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- lythos-labs/lythoskill
- Path
skills/lythoskill-coach/SKILL.md- Versions recorded
- 10
- Latest version
- v0.21.0, committed Oct 23, 2026
- First version recorded
- Aug 27, 2026
- Size
- 11,859 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:a2bb1b7d6dc85369The line at the top of this page pins the label v0.21.0, 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_dmmixvcmcerlnue7)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 10 versions of this file, between Aug 27, 2026 and Oct 23, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.21.0 latest | 2026-10-23 | afa7efd | 11,859 B | A | view · diff |
| v0.20.1 | 2026-10-14 | 0e42b7b | 11,859 B | A | view · diff |
| v0.20.0 | 2026-10-13 | da50fe4 | 11,859 B | A | view · diff |
| v0.19.3 | 2026-09-11 | b988114 | 11,859 B | A | view · diff |
| v0.19.2 | 2026-09-11 | 8f116d7 | 11,859 B | A | view · diff |
| v0.19.1 | 2026-09-09 | bc2053c | 11,859 B | A | view · diff |
| v0.19.1 | 2026-09-09 | c3edaf7 | 11,860 B | A | view · diff |
| v0.19.1 | 2026-09-08 | 0a0e7a3 | 11,827 B | A | view · diff |
| v0.19.0 | 2026-09-08 | cc5fe72 | 11,827 B | A | view · diff |
| v0.17.11 | 2026-08-27 | 3410784 | 11,828 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 (11859 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_dmmixvcmcerlnue7 GET https://markdownregistry.com/api/v1/resolve?ref=lythos-labs/lythoskill/lythoskill-coach GET https://markdownregistry.com/api/v1/blob/a2bb1b7d6dc85369b66d50d030fe32a044403cd6da16a2d1788bb1235f668c4f
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 lythos-labs/lythoskill
Every file in lythos-labs/lythoskill