Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/fiberplane/mcp-gateway/agents-mdgit clone --depth 1 https://github.com/fiberplane/mcp-gatewayWrote 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/fiberplane/mcp-gateway/agents-md)<a href="https://agentmods.dev/instructions/fiberplane/mcp-gateway/agents-md"><img src="https://agentmods.dev/badge/instructions/fiberplane/mcp-gateway/agents-md.svg" alt="Measured on agentmods" 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 | $0.05846 | $0.05846 |
| Opus 5 | $0.02923 | $0.02923 |
| Sonnet 5 | $0.01169 | $0.01169 |
| Haiku 4.5 | $0.00585 | $0.00585 |
Grade A, and why
mcp-gateway AGENTS.md scanned grade A 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 4d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl http://localhost:3333/s/everything/mcp \ How it starts
The opening of the file, as written. The whole thing — 628 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MCP Gateway Monorepo - Claude Code Instructions
Project Overview
This is a Bun workspace monorepo containing the MCP Gateway project. The repository structure follows monorepo best practices while maintaining backward compatibility for the main @fiberplane/mcp-gateway package.
Repository Structure
/Users/jaccoflenter/dev/fiberplane/mcp-gateway/
├── packages/
│ ├── mcp-gateway/ # @fiberplane/mcp-gateway (main package)
│ │ ├── src/ # CLI orchestration
│ │ │ └── cli.ts # CLI entry point
│ │ ├── bin/ # Development CLI executable
│ │ ├── tests/ # Integration tests
│ │ ├── package.json # CLI package configuration
│ │ └── tsconfig.json
│ ├── types/ # @fiberplane/mcp-gateway-types
│ │ ├── src/ # Type definitions and Zod schemas
│ │ ├── package.json # Types package configuration
│ │ └── tsconfig.json
│ ├── core/ # @fiberplane/mcp-gateway-core
│ │ ├── src/ # Core business logic
│ │ │ ├── registry/ # Registry operations
│ │ │ ├── capture/ # MCP traffic capture
│ │ │ ├── logs/ # Log storage and queries
│ │ │ ├── utils/ # Shared utilities
│ │ │ ├── logger.ts # Logging infrastructure
│ │ │ └── health.ts # Health checks
│ │ ├── package.json # Core package configuration
│ │ └── tsconfig.json
│ ├── management-mcp/ # @fiberplane/mcp-gateway-management-mcp
│ │ ├── src/ # Gateway management MCP API
│ │ │ ├── tools/ # MCP tools (server & capture)
│ │ │ ├── app.ts # MCP server creation
│ │ │ └── index.ts # Public exports
│ │ ├── package.json # Management MCP package configuration
│ │ ├── tsconfig.json
│ │ └── README.md # Management MCP documentation
│ ├── server/ # @fiberplane/mcp-gateway-server
│ │ ├── src/ # HTTP server with proxy
│ │ │ ├── routes/ # Proxy and OAuth routes
│ │ │ ├── app.ts # Hono application factory
│ │ │ └── index.ts # Public exports
│ │ ├── package.json # Server package configuration
│ │ ├── tsconfig.json
│ │ └── README.md # Server documentation
│ ├── web/ # @fiberplane/mcp-gateway-web
│ │ ├── src/ # React web UI
│ │ │ ├── components/ # React components
│ │ │ ├── lib/ # API client and utilities
│ │ │ ├── App.tsx # Main application
│ │ │ └── main.tsx # Entry point
│ │ ├── public/ # Static assets (gitignored)
│ │ ├── package.json # Web package configuration
│ │ ├── tsconfig.json
│ │ └── vite.config.ts # Vite configuration
│ └── api/ # @fiberplane/mcp-gateway-api
│ ├── src/ # REST API for UI
│ │ ├── routes/ # API route handlers
│ │ ├── app.ts # API app factory
│ │ └── index.ts # Public exports
│ ├── package.json # API package configuration
│ ├── tsconfig.json
│ └── README.md # API documentation
├── test-mcp-server/ # Test MCP server for validation
│ ├── *.ts # Test server configurations
│ └── package.json # Test server dependencies
├── scripts/ # Shared build scripts
│ └── build.ts # Package build script
├── .github/workflows/ # CI/CD workflows
├── package.json # Root workspace configuration
└── [config files] # Root-level configurations
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.
- 4d ago First seen · 628 lines · 5,846 tokens per session scan A baa466863b82
mcp-gateway AGENTS.md is an instructions file published in the GitHub repository fiberplane/mcp-gateway (24 stars, last pushed 9mo ago), licensed MIT. It adds 5,846 tokens to every session, about $0.0292 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). 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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.