SkillSeal

Test your Agent Skills before your agents do.

SKILL.md files can be syntactically valid and still be bad: a vague description that never routes correctly, an oversized file that eats context, a curl | sh buried in a code block, a hardcoded /Users/you/... path that only works on your machine. SkillSeal is a local-first, offline-first CLI that lints, scores, and routing-tests SKILL.md files — catching what a manual read-through misses, before an agent does.

skillseal check output: two WARNs, a FAIL on rm-rf, a WARN on an absolute path, score 86/100

What it catches

Category	Catches things like
Specification	Invalid frontmatter, a `name` that doesn't match its directory
Quality	Vague descriptions, oversized files, dangling file references
Security	`rm -rf` / `curl \| sh` in a code block, secret-file reads
Portability	Hardcoded `/Users/you/...` paths, OS-specific commands

Full docs: https://pespinel.github.io/SkillSeal/

Installation

uv tool install skillseal
# or: pipx install skillseal
# or: pip install skillseal

One-off, no install:

uvx skillseal check ./skills

Quickstart

skillseal check ./skills          # lint: spec, quality, security, portability
skillseal test ./skills           # routing tests (skillseal.yaml)
skillseal conflicts ./skills      # duplicate names / routing overlap between skills
skillseal diff old/ new/          # score delta between two versions of a skill

See the full command reference, skillseal.yaml/skillseal.toml config, and CI integration (GitHub Action, pre-commit hook) on the docs site.

Contributing

See AGENTS.md for setup, quality gates, and how to add a rule. Planned work is tracked in Issues.

License

MIT

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