Borrowing it
Nothing to install: this file belongs to zircote/mcp-bundle. 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/zircote/mcp-bundle/main/CLAUDE.mdgit clone --depth 1 https://github.com/zircote/mcp-bundleWrote 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/zircote/mcp-bundle/claude-md)<a href="https://agentmods.dev/instructions/zircote/mcp-bundle/claude-md"><img src="https://agentmods.dev/badge/instructions/zircote/mcp-bundle/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/zircote/mcp-bundle/claude-md"><img src="https://agentmods.dev/badge/instructions/zircote/mcp-bundle/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 | $0.00431 | $0.00431 |
| Opus 5.5 | $0.00172 | $0.00172 |
| Sonnet 5.5 | $0.00086 | $0.00086 |
| Haiku 4.5 | $0.00043 | $0.00043 |
Grade A, and why
mcp-bundle 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.
What it actually says
mcp-bundle
Claude Code plugin for generating MCPB (MCP Bundle) packages and a reusable GitHub Actions workflow for automated MCPB packaging.
Plugin Structure
mcp-bundle/
├── .claude-plugin/
│ └── plugin.json # Plugin manifest (required)
├── skills/
│ └── mcpb/
│ └── SKILL.md # /mcp-bundle:mcpb skill
├── .github/
│ └── workflows/
│ └── mcp-bundle.yml # Reusable workflow for CI/CD packaging
├── action.yml # GitHub Actions Marketplace composite action
├── examples/ # Example caller workflows
├── tests/ # Validation and test scripts
├── CLAUDE.md # This file
├── LICENSE # MIT
└── README.md # Documentation
Skills
/mcp-bundle:mcpb
Generates MCPB bundle packages for MCP server projects. Detects existing MCP server implementations, generates manifest.json, creates bundle directory structure, validates against the MANIFEST.md spec, and wires in CI/CD via the reusable workflow.
Testing
Run the test suite:
./tests/test-manifest-validation.sh
Requires: bash 4+, jq. Tests validate manifest parsing, required fields, validation rules, workflow/action structure, skill content, and example presence. All 262 tests must pass before committing.
Test fixtures live in tests/fixtures/ — add new .json fixtures there for additional validation test cases.
MCPB Spec Reference
- Manifest spec version:
0.3(Node/Python/Binary),0.4(UV runtime) - Bundle format: ZIP archive with
.mcpbextension - Transport: stdio only
- Required manifest fields:
manifest_version,name,version,description,author,server - Server types:
node,python,binary,uv
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.
- 1mo ago First seen · 49 lines · 431 tokens per session scan A eae77bef3cb4
mcp-bundle CLAUDE.md is an instructions file published in the GitHub repository zircote/mcp-bundle (3 stars, last pushed 7mo ago), licensed MIT. It adds 431 tokens to every session, about $0.0017 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.
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.
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).
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.