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skill-optimizer: Instructions file for Claude Code

CLAUDE.md

skill-optimizer CLAUDE.md is an instructions file for Claude Code from fastxyz/skill-optimizer. It costs 888 tokens per session, scanned A, a copy of skill-optimizer AGENTS.md, MIT.

Project instructions for a Docker-based workbench that runs and grades coding-agent skill tests. A workbench is an isolated environment for running a task, recording what happened, and checking the result against expected outcomes.

In plain words
What is it for?
They are for developing the CLI, running individual cases or suites, working with the Docker runner and graders, and maintaining the skill and plugin packaging.
Why use it?
They explain the project layout and standard commands needed to build, type-check, test, and run evaluation cases.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions .claude-plugin; mentions CLAUDE.md; mentions Claude Code.

This is fastxyz/skill-optimizer's own configuration. It tells Claude Code how to work on skill-optimizer 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 skill-optimizer configures →

not rated 81repo 4mo ago A scan 888 tokens copy · 91% MIT
View source ↗ fastxyz/skill-optimizer
Reuse

Borrowing it

Nothing to install: this file belongs to fastxyz/skill-optimizer. 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/fastxyz/skill-optimizer/development/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/fastxyz/skill-optimizer

Made for: Claude Code.

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README.md
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<a href="https://agentmods.dev/instructions/fastxyz/skill-optimizer/claude-md"><img src="https://agentmods.dev/badge/instructions/fastxyz/skill-optimizer/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 888 This file is loaded in full into every session.
When invoked 888 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 91% copy Near-identical to another mod 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 $0.00888 $0.00888
Opus 5.5 $0.00355 $0.00355
Sonnet 5.5 $0.00178 $0.00178
Haiku 4.5 $0.00089 $0.00089

Measured 1mo ago against content hash 337fa0abf6ee, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

skill-optimizer 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 1mo 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.

Origin

This is a copy

91% identical to skill-optimizer AGENTS.md — 5 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

CLAUDE.md · 65 lines

How it starts

The opening of the file, as written. The whole thing — 65 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Project Overview

skill-optimizer is a Docker workbench for running and grading agent skill eval cases. The current public CLI centers on run-case and run-suite.

The workbench gives an agent an isolated Docker /work directory, captures traces, and grades deterministic local outcomes from files, command logs, generated artifacts, or other workspace state.

Key Commands

npm run build
npm run typecheck
npm test
npx tsx src/cli.ts --help
npx tsx src/cli.ts run-case --help
npx tsx src/cli.ts run-suite --help

Important Files

  • src/cli.ts: public CLI entrypoint
  • src/workbench/: workbench case loading, suite loading, Docker runner, Pi agent, graders, and traces
  • docker/workbench-runner.Dockerfile: generic non-root container image for setup, agent, grade, and cleanup phases
  • skills/skill-optimizer/SKILL.md: canonical distributable Agent Skill
  • skills/skill-optimizer/references/workbench.md: detailed workbench schema and usage reference
  • .claude-plugin/, .codex-plugin/, .cursor-plugin/, .opencode/: cross-agent plugin manifests and install support
  • .agents/plugins/marketplace.json: Codex repo marketplace entry for the root plugin
  • gemini-extension.json, GEMINI.md: Gemini extension metadata and context file
  • examples/workbench/: tracked example eval suites
  • README.md: provider-specific installation instructions for Claude Code, Codex, Cursor, OpenCode, Gemini CLI, and skill-only installs
  • CONTRIBUTING.md: contributor workflow and current workbench invariants

Installation Docs

Keep the README installation section aligned with packaged plugin metadata:

  • Claude Code: .claude-plugin/plugin.json and .claude-plugin/marketplace.json
  • Codex: .agents/plugins/marketplace.json and .codex-plugin/plugin.json
  • Cursor: .cursor-plugin/plugin.json and .cursor/INSTALL.md
  • OpenCode: .opencode/plugins/skill-optimizer.js and .opencode/INSTALL.md
  • Gemini CLI: gemini-extension.json and GEMINI.md
  • Skill-only installs: npx skills add fastxyz/skill-optimizer --skill skill-optimizer ...

Read the full file on GitHub · 65 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. 1mo ago First seen · 65 lines · 888 tokens per session scan A 337fa0abf6ee

Subscribe to this mod's changes

skill-optimizer CLAUDE.md is an instructions file published in the GitHub repository fastxyz/skill-optimizer (81 stars, last pushed 4mo ago), licensed MIT. It adds 888 tokens to every session, about $0.0036 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 91% identical to skill-optimizer AGENTS.md, differing in 5 lines, and is treated as a copy.

Evaluationaiai-agentai-skillbenchmarkcli
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