skill-lint

A repository-wide checker for skills, which are reusable instruction packages for coding agents. It reviews their metadata, routing descriptions, and selected high-risk inconsistencies.

In plain words
What is it for?
Use it to lint an entire skills repository, run stricter checks, output JSON for automation, or fail when warnings are found.
Why use it?
It provides a repeatable way to catch problems across many skills after edits, refactoring, or cleanup.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/cloud99277/kitclaw/skill-lint
Any agent
npx skills add cloud99277/KitClaw --skill skill-lint
Clone the repo
git clone --depth 1 https://github.com/cloud99277/KitClaw

Made for: Claude Code, Codex.

Per session 52 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 623 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00052 $0.00623
Opus 5 $0.00026 $0.00311
Sonnet 5 $0.00010 $0.00125
Haiku 4.5 $0.00005 $0.00062

Measured 2d ago against content hash e5eddb2ed59d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

skill-lint scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

The scan reads SKILL.md. This mod also ships 2 executable files (scripts/lint_skills.py, scripts/run_lint.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

core-skills/skill-lint/SKILL.md · 100 lines

What it actually says

Skill Lint

Run deterministic lint checks across a centralized skills repository.

This skill wraps the repository-wide lint_skills.py checker and gives agents a stable entry point for validating skill frontmatter, routing metadata, and a small set of high-risk body inconsistencies.

When to Use

  • After editing many skills in one pass
  • Before committing or reviewing changes in a shared skills repo
  • When checking whether SKILL.md frontmatter follows repository conventions
  • When checking whether description lines still match the routing template
  • When you want a machine-readable lint report for CI or batch cleanup

Script Directory

Use the wrapper script in this skill:

python3 "${SKILL_DIR}/scripts/run_lint.py" [path] [options]

The wrapper delegates to the repository-level checker at:

.system/skill-creator/scripts/lint_skills.py

Common Commands

Run across the whole centralized repository:

python3 "${SKILL_DIR}/scripts/run_lint.py"

Run in strict mode:

python3 "${SKILL_DIR}/scripts/run_lint.py" --strict

Get JSON output:

python3 "${SKILL_DIR}/scripts/run_lint.py" --format json

Fail on warnings:

python3 "${SKILL_DIR}/scripts/run_lint.py" --fail-on-warnings

Only show structural errors:

python3 "${SKILL_DIR}/scripts/run_lint.py" --errors-only

Lint a specific root:

python3 "${SKILL_DIR}/scripts/run_lint.py" "/path/to/skills/root"

What It Checks

  • Frontmatter structure and required keys
  • name format and length
  • description shape, old phrases, and routing-template drift
  • Known high-risk body inconsistencies such as legacy commands or outdated trigger wording

Output Interpretation

  • OK: no issues found for that skill
  • WARN: semantic or routing-quality issues
  • ERROR: structural issues that should block acceptance

Default Behavior

  • Default mode is compatibility mode
  • Body checks are enabled by default
  • --strict is best for newly-created or fully normalized skill repos
  • --format json is best for CI or batch post-processing
Files

What ships with it

3 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 100 lines · 52 tokens per session scan A e5eddb2ed59d

Subscribe to this mod's changes

skill-lint is a skill published in the GitHub repository cloud99277/KitClaw (5 stars, last pushed 4mo ago), licensed MIT. It adds 52 tokens to every session and 623 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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