MCP Servers

OpenAPI Sync MCP

High-performance MCP server for OpenAPI specifications that parses specs, diffs versions, tracks dependencies, and generates code (TypeScript, Rust, Python).

README

OpenAPI Sync MCP

A high-performance MCP server for OpenAPI specifications. Parse, diff, track dependencies, and generate code - all from your AI assistant.

Built with Rust for speed and minimal resource usage.

Features

Dependency Graph - Know which endpoints break when you change a schema
Smart Diff - Detect breaking changes before they hit production
Paginated Parsing - Handle massive specs without overwhelming context
24h Cache - Fast repeated queries with HTTP cache support
Multi-target Codegen - TypeScript, Rust, Python from one spec

Quick Start

npm install -g @jhlee0409/openapi-sync-mcp

Add to ~/.claude/settings.json:

{
  "mcpServers": {
    "oas": {
      "command": "openapi-sync-mcp"
    }
  }
}

Tools

Tool	Description
`oas_parse`	Parse and validate OpenAPI spec (with pagination)
`oas_deps`	Find affected endpoints when a schema changes
`oas_diff`	Compare two spec versions, detect breaking changes
`oas_status`	Check cache status
`oas_generate`	Generate TypeScript/Rust/Python code

Code Generation Targets

typescript-types · typescript-fetch · typescript-axios · typescript-react-query · rust-serde · rust-reqwest · python-pydantic · python-httpx

Installation

# npm (recommended)
npm install -g @jhlee0409/openapi-sync-mcp

# Cargo
cargo install openapi-sync-mcp

# Or download from GitHub Releases

Troubleshooting

Server not responding?

chmod +x openapi-sync-mcp
echo '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}' | openapi-sync-mcp

Cache issues? Delete .openapi-sync.cache.json or use use_cache: false.

Development

cargo test          # Run tests
cargo fmt --check   # Check formatting
cargo clippy        # Lint

License

MIT

claude-plugins - Plugin commands (/oas:*) for enhanced workflow

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