oasdiff MCP MCP server

This hosted remote MCP server allows AI assistants to detect breaking changes, generate changelogs, perform structural diffs, and validate OpenAPI specifications. It operates over Streamable HTTP transport without requiring installation or API keys, enabling developers to ask if changes break APIs and receive readable reports on spec compliance.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by oasdiff

MCP endpoint (Streamable HTTP)

https://api.oasdiff.com/mcp

Vendor documentation

What you can do with it

Detect breaking changes between OpenAPI specs
Generate full changelogs for API updates
Validate specs against OpenAPI rules
Compare two specs to check for client breaks

Tools advertised by the last live check:

oasdiff_breaking_changes
oasdiff_changelog
oasdiff_diff
oasdiff_validate

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http oasdiff-mcp https://api.oasdiff.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add oasdiff-mcp --url https://api.oasdiff.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable oasdiff-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "oasdiff-mcp": {
      "url": "https://api.oasdiff.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "oasdiff-mcp": {
      "type": "streamableHttp",
      "url": "https://api.oasdiff.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start oasdiff-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "oasdiff-mcp": {
      "type": "http",
      "url": "https://api.oasdiff.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http oasdiff-mcp https://api.oasdiff.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "oasdiff-mcp": {
      "url": "https://api.oasdiff.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "oasdiff-mcp": {
      "serverUrl": "https://api.oasdiff.com/mcp"
    }
  }
}

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