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skillcheck: Instructions file for Claude Code

CLAUDE.md

skillcheck CLAUDE.md is an instructions file for Claude Code from Sagargupta16/skillcheck. It costs 1,215 tokens per session, scanned A, original, MIT.

Repository instructions for skillcheck, a TypeScript command-line tool that checks whether agent skills follow the Agent Skills specification. It also describes the project’s package, build, and test commands.

In plain words
What is it for?
Developing, building, linting, testing, and running the skillcheck CLI against example skill files.
Why use it?
They give the coding agent the project context and exact commands needed to make compatible changes and verify them.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code; mentions OpenCode.

This is Sagargupta16/skillcheck's own configuration. It tells Claude Code how to work on skillcheck itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything skillcheck configures →

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is - Root [`CLAUDE.md`](../../CLAUDE.md) -- voice, rules, routing map, references, skills, slash commands, conventions..

not rated 5repo changed 11d ago A scan 1,215 tokens original MIT
View source ↗ Sagargupta16/skillcheck
Reuse

Borrowing it

Nothing to install: this file belongs to Sagargupta16/skillcheck. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/Sagargupta16/skillcheck/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/Sagargupta16/skillcheck

Made for: Claude Code.

Wrote this? Show the measurements

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Your own site · 80×15
<a href="https://agentmods.dev/instructions/sagargupta16/skillcheck/claude-md"><img src="https://agentmods.dev/badge/instructions/sagargupta16/skillcheck/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,215 This file is loaded in full into every session.
When invoked 1,215 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.01215 $0.01215
Opus 5.5 $0.00486 $0.00486
Sonnet 5.5 $0.00243 $0.00243
Haiku 4.5 $0.00121 $0.00121

Measured 11d ago against content hash c81f67c348c3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skillcheck CLAUDE.md 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 11d ago.

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.

CLAUDE.md · 70 lines

How it starts

The opening of the file, as written. The whole thing — 70 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file stacks on top of the workspace root at C:\Code\GitHub\:

  • Root CLAUDE.md -- voice, rules, routing map, references, skills, slash commands, conventions.
  • Root MEMORY.md -- live facts across repos.
  • Root STATUS.md -- live PR/CI/security dashboard.
  • .claude/resources/ -- deep reference for collaboration, workflow, git, OSS, debugging, voice.

Read those first. The guidance below only adds repo-specific context -- it does not override anything in the root.

Project

Conformance suite for Agent Skills (SKILL.md): lints skills against the agentskills.io spec today; roadmap is headless cross-runtime execution tests + a public caniuse-style compatibility matrix. Public OSS, npm package @sagargupta1610/skillcheck.

Stack

  • Language: TypeScript 7 (strict, ESM, NodeNext)
  • Framework: none -- CLI via commander, JS bundled by tsup, .d.ts emitted by tsc
  • Database: none
  • Package manager: pnpm
  • Deploy target: npm registry (CLI); GitHub Pages (playground)

Run

pnpm install
pnpm dev          # tsup --watch (JS only, no .d.ts)
pnpm build        # tsup -> dist/*.js, then tsc --emitDeclarationOnly -> dist/*.d.ts
node dist/cli.js lint fixtures/valid-skill

Test

pnpm test         # vitest
pnpm lint         # biome
pnpm typecheck

Entry points

  • src/cli.ts -- commander CLI (skillcheck lint)
  • src/index.ts -- library exports (lintSkillDir, parseSkillMd, types)

Key files

  • src/lint/rules.ts -- the "brain": all lint rule implementations and limits
  • src/extensions.ts -- SPEC_FIELDS + KNOWN_EXTENSIONS typed registry (spec fields, client extension fields)
  • src/lint/parse.ts -- SKILL.md frontmatter/body splitter (never throws)
  • src/lint/source.ts -- lintSkillSource: per-file rules on a string, no fs; shared by lintSkillDir and the playground
  • site/ -- browser playground (pnpm site:build -> dist-site/, pnpm site:serve), deployed by .github/workflows/pages.yml
  • scripts/corpus-scan.ts + scripts/corpus.json -- pnpm corpus scans pinned public skill repos into docs/corpus.md
  • fixtures/ -- valid-skill and broken-skill lint fixtures used by tests and CI smoke test

Read the full file on GitHub · 70 lines

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. 11d ago Changed · +7 lines · +251 tokens per session c81f67c348c3
  2. 1mo ago Changed · +1 lines · +220 tokens per session 923009cf28c7
  3. 2mo ago First seen · 62 lines · 744 tokens per session scan A 4250a455a001

Subscribe to this mod's changes

skillcheck CLAUDE.md is an instructions file published in the GitHub repository Sagargupta16/skillcheck (5 stars, last pushed 6d ago), licensed MIT. It adds 1,215 tokens to every session, about $0.0049 per session on Opus 5.5. 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.

Building agentsClaude CodeLintTypeScriptagent-skillscliconformance
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