Borrowing it
Nothing to install: this file belongs to krzysztofsurdy/code-virtuoso. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/krzysztofsurdy/code-virtuoso/main/CLAUDE.mdgit clone --depth 1 https://github.com/krzysztofsurdy/code-virtuosoWrote 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.
[](https://agentmods.dev/instructions/krzysztofsurdy/code-virtuoso/claude-md)<a href="https://agentmods.dev/instructions/krzysztofsurdy/code-virtuoso/claude-md"><img src="https://agentmods.dev/badge/instructions/krzysztofsurdy/code-virtuoso/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>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.
<a href="https://agentmods.dev/instructions/krzysztofsurdy/code-virtuoso/claude-md"><img src="https://agentmods.dev/badge/instructions/krzysztofsurdy/code-virtuoso/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00647 | $0.00647 |
| Opus 5.5 | $0.00259 | $0.00259 |
| Sonnet 5.5 | $0.00129 | $0.00129 |
| Haiku 4.5 | $0.00065 | $0.00065 |
Grade A, and why
code-virtuoso 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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 57 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Code Virtuoso - Claude Code Instructions
@AGENTS.md
This file contains Claude Code specific optimizations. For general agent architecture and contribution guidelines, see the included files above.
Claude Code tool mapping
Map the generic tool categories used in agent definitions to Claude Code tools:
| Generic Category | Claude Code Tool |
|---|---|
| File reading | Read |
| Code search | Grep, Glob |
| Shell | Bash |
| File editing | Edit, Write |
Skill research process
When creating a new skill in this project:
- Search skills.sh for existing skills:
npx skills find "{topic}" - Fetch skill details from skills.sh URLs to understand what others have built
- Search the web for official documentation, best practices, and community guides
- Use parallel research agents to gather information on multiple subtopics simultaneously
- Read existing skills in this project to match the structure and depth
Marketplace configuration
File: .claude-plugin/marketplace.json
MANDATORY: Any change to skills MUST include a marketplace.json update. This is non-negotiable.
- When adding a new skill: update skill paths in the appropriate plugin, bump minor version
- When updating an existing skill's content: bump patch version
- When renaming skills, reorganizing directories, or changing plugin structure: bump major version
- Also update README.md skill tables and repository structure when adding/renaming/moving skills
- Only
agents-virtuosouses"source": "./"(it shipsagents/andworkflows/). Every skill-only bundle uses"source": "./skills"with paths relative to it, so no bundle registers the agents twice - After changing an agent file, run
python3 scripts/build-codex-agents.pyto regeneratecodex/agents/ - Run
claude plugin validate .andpython3 scripts/validate-*.pybefore committing - Plugins under
plugins/(Claude Code only) have their ownplugin.jsonthat owns the plugin version. Their marketplace entry has onlyname,source, anddescription. Changing one still bumps the marketplace version.
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.
- 2d ago Changed · +4 lines · +152 tokens per session 68836239bbcb
- 1mo ago First seen · 53 lines · 495 tokens per session scan A e625a3f9d16f
code-virtuoso CLAUDE.md is an instructions file published in the GitHub repository krzysztofsurdy/code-virtuoso (36 stars, last pushed yesterday), licensed MIT. It adds 647 tokens to every session, about $0.0026 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).