Borrowing it
Nothing to install: this file belongs to specmatic/specmatic-mcp-server. 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/specmatic/specmatic-mcp-server/main/AGENTS.mdgit clone --depth 1 https://github.com/specmatic/specmatic-mcp-serverWrote 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/specmatic/specmatic-mcp-server/agents-md)<a href="https://agentmods.dev/instructions/specmatic/specmatic-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/specmatic/specmatic-mcp-server/agents-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/specmatic/specmatic-mcp-server/agents-md"><img src="https://agentmods.dev/badge/instructions/specmatic/specmatic-mcp-server/agents-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 | $0.03587 | $0.03587 |
| Opus 5.5 | $0.01435 | $0.01435 |
| Sonnet 5.5 | $0.00717 | $0.00717 |
| Haiku 4.5 | $0.00359 | $0.00359 |
Grade A, and why
specmatic-mcp-server AGENTS.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 2mo 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 — 428 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
This file provides shared guidance for coding agents working with code in this repository.
Project Overview
This is an MCP (Model Context Protocol) server that exposes Specmatic Contract Test capability, allowing coding agents to use it as a reference while implementing OpenAPI specification.
Current State
This is a fully implemented MCP (Model Context Protocol) server built with TypeScript/Node.js that exposes Specmatic contract testing capabilities. The implementation includes:
- MCP Server: Complete implementation with 3 main tools
- npm Package: Standalone package using
specmaticnpm dependency - Secure Docker: Uses
node:latestbase image for reduced vulnerabilities - Contract Testing: Supports both standard and resiliency testing
- Mock Server: Can start mock servers from OpenAPI specs
- Build System: TypeScript compilation with npm scripts
- Automated Testing: MCP Inspector integration for testing npm package functionality
Development Setup
The project is built with TypeScript and uses Node.js. Always use nvm to use the node stable version.
Prerequisites
- Node.js (use
nvm use stable) - Docker (optional - for running the MCP server in container)
- npm package can be run standalone without Docker
Available Commands
# Build the TypeScript code
npm run build
# Start the MCP server locally
npm start
# Development mode with watch
npm run dev
# Testing commands
npm run test:smoke # Run smoke test loop (recommended)
npm run test:mcp # Run MCP Inspector tests for npm package
npm run inspect # Interactive MCP Inspector
# Docker commands (optional)
npm run docker:build # Build Docker image
npm run docker:run # Run in container
npm run start:host-network # Run with host networking for localhost API testing
# Setup host for development
npm run setup # Runs setup-host.sh script
Dependencies
@modelcontextprotocol/sdk: MCP protocol implementationspecmatic: Contract testing framework (npm package)zod: Input validation and parsing- TypeScript for type safety
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.
- 2mo ago First seen · 428 lines · 3,587 tokens per session scan A c4fb8756bda1
specmatic-mcp-server AGENTS.md is an instructions file published in the GitHub repository specmatic/specmatic-mcp-server (12 stars, last pushed 4mo ago), licensed MIT. It adds 3,587 tokens to every session, about $0.0143 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.
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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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.