Skill Crossroads packages__core__test__fixtures__skills__no-frontmatter
rubric v1.2 · deterministic
D+ 67.3/100 overall
Correctness & Structure 33 2 fail
Triggering & Discoverability 33 2 fail
Clarity & Instructions 100 pass
Token & Context Cost 100 pass
Safety & Security 100 pass
Verifiability & Maintainability 53 1 fail

Top fixes — ranked by score impact

✗ STRUCT-01 Valid YAML frontmatter
SKILL.md:1a Claude Code skill → file does not begin with a `---` frontmatter fence
No YAML frontmatter block found at the top of the file.
Fix Add a `---`-fenced YAML block at the very top with at least a `description` field.
✗ STRUCT-02 Recommended fields present
SKILL.md:1
No frontmatter to read fields from (see STRUCT-01).
Fix Add frontmatter with a `description` field.
✗ TRIGGER-02 Description long enough to anchor invocation
SKILL.md:1
No description — nothing for the model to match against.
Fix Add a description that leads with the use case and the phrases a user would say.
✗ TRIGGER-03 Invocation cues in the description
SKILL.md:1
No description — no invocation cues possible.
Fix Add a description with explicit cues: 'Use when …' plus the phrases a user would say.
✗ VERIFY-01 Evals or tests present
SKILL.md:1the skill works → no evals/, tests/, or verification section found
No way to prove the skill does what it claims.
Fix Add an evals/ folder (test prompts + expected outcomes) and a '## Verify' step in the body.
★ scores higher than ≈2% of 214 public skills (deterministic rubric v1.2 sample, 2026-07)

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