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skills: Instructions file for Codex

AGENTS.md

skills AGENTS.md is an instructions file for Codex, OpenCode from jkeskikangas/skills. It costs 1,612 tokens per session, scanned C, original, Apache-2.0.

A set of rules for contributors working on the jkeskikangas/skills code repository. It explains required commands, testing, dependency changes, releases, and prohibited actions.

In plain words
What is it for?
It is for preparing changes, running checks, managing dependencies, and releasing updates in that repository.
Why use it?
It gives coding agents a shared set of repository rules, reducing mistakes such as using the wrong package manager, skipping tests, or committing secrets.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions AGENTS.md.

This is jkeskikangas/skills's own configuration. It tells Codex and OpenCode how to work on skills 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 skills configures →

not rated 10repo 1mo ago C scan 1,612 tokens original Apache-2.0
View source ↗ jkeskikangas/skills
Reuse

Borrowing it

Nothing to install: this file belongs to jkeskikangas/skills. 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/jkeskikangas/skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/jkeskikangas/skills

Made for: Codex, OpenCode.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

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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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Per session 1,612 This file is loaded in full into every session.
When invoked 1,612 The same file — it is already loaded in full.
Security scan C 1 finding. 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 $0.01612 $0.01612
Opus 5 $0.00806 $0.00806
Sonnet 5 $0.00322 $0.00322
Haiku 4.5 $0.00161 $0.00161

Measured 9d ago against content hash 220b9b12b30d, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade C, and why

skills AGENTS.md scanned grade C with 1 finding 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 9d 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.

Recursive force deletehighDestructive command

rm -rf with a variable or a broad path is one typo away from removing the wrong tree.

cd packages/skillcheck && npm ci # ON FAIL: rm -rf node_modules && npm ci
AGENTS.md · 128 lines

How it starts

The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md

CRITICAL

  • MUST: cd packages/skillcheck && npm ci to install dependencies
  • MUST: cd packages/skillcheck && npm run build before running linter locally
  • MUST: Run both linters before commit: node packages/skillcheck/bin/skillcheck.js skills/ and npx agnix skills/
  • MUST: cd packages/skillcheck && npm test before pushing to main
  • MUST: Use npm install <pkg> to change deps (DO NOT edit package.json manually)
  • MUST: Use cd packages/skillcheck && npm version <patch|minor|major> && git push --follow-tags to release (tag must match package.json version)
  • NEVER: yarn, pnpm, bun — repo uses npm (packages/skillcheck/package-lock.json)
  • NEVER: Push a git tag manually without bumping packages/skillcheck/package.json first (CI will fail)
  • NEVER: Create feature branches or open PRs — commit and push directly to main
  • NEVER: Force push (git push --force, git push -f) to main
  • NEVER: Skip pre-commit hooks (--no-verify)
  • NEVER: Edit files in packages/skillcheck/dist/ (generated)
  • NEVER: Commit .env files, API keys, tokens, or credentials
  • NEVER: Read or include secrets in skill definitions
  • PREFER: Built-in tools (file reader, editor, glob, grep) over shell equivalents (cat, sed, find, grep)
  • ON FAIL: Read full error output before retry
  • ON FAIL (lint): Run node packages/skillcheck/bin/skillcheck.js --fix skills/ for auto-fixable issues, then re-run
  • ON FAIL (test): Run single test file: cd packages/skillcheck && npx vitest run src/<file>.test.ts

Domain & Context

  • Goal: Rubric-graded writing and review workflows that turn rough prompts into professional-grade agent skill definitions
  • Type: CLI/Tool
  • License: Apache-2.0
  • Key Terms:
    • Skill: Structured directory (SKILL.md + agents/ + references/) defining an AI coding agent capability
    • skillcheck: Internal Node.js linter validating skill structure, frontmatter, and rubric consistency
    • agnix: External linter validating specification rules (token limits, safety, cross-platform)
    • Rubric: Markdown document with grade bands (A-F), P1/P2/P3 priorities, and scoring dimensions
    • Generator-critic loop: Write -> Validate -> Review -> Fix cycle until quality bar met (score >= 4.5, no P1s)

Read the full file on GitHub · 128 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. 9d ago First seen · 128 lines · 1,612 tokens per session scan C 220b9b12b30d

Subscribe to this mod's changes

skills AGENTS.md is an instructions file published in the GitHub repository jkeskikangas/skills (10 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 1,612 tokens to every session, about $0.0081 per session on Opus 5. A static security scan graded it C with 1 finding (recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

ai-agentsclaudecodexskills
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