mendix-marketplace-mcp-proxy
MCP proxy that bridges Mendix Marketplace's Streamable HTTP endpoint to stdio, enabling Claude Code and other stdio-only MCP clients to access Mendix Marketplace tools and prompts dynamically.
README
mendix-marketplace-mcp-proxy
MCP-to-MCP proxy for the Mendix Marketplace MCP endpoint.
Connects to the official Mendix Marketplace MCP server via Streamable HTTP, discovers its tools and prompts dynamically, and re-exposes them over stdio — making them accessible to Claude Code and other MCP clients that only support stdio transport.
Why a proxy?
Claude Code's MCP transports don't directly support Mendix's Streamable HTTP endpoint:
- HTTP transport requires OAuth discovery, which Mendix doesn't implement
- SSE transport uses GET, but the endpoint only accepts POST
This proxy bridges the gap: Claude Code ←stdio→ proxy ←StreamableHTTP→ Mendix.
Setup
npm install
Authentication
Get a Personal Access Token (PAT) from Mendix Developer Settings.
Set it as an environment variable:
export MENDIX_PAT=your-token-here
Usage
With Claude Code
claude mcp add mendix-marketplace-mcp-proxy -e MENDIX_PAT=your-token -- npx tsx /path/to/mendix-marketplace-mcp-proxy/src/index.ts
Standalone
npm run dev # Development (tsx)
npm run build # Compile TypeScript
npm start # Production (node)
How it works
- Connects to the Mendix MCP endpoint as a client using
StreamableHTTPClientTransport - Discovers all available tools and prompts via
tools/listandprompts/list - Registers them on a local MCP server with identical schemas
- Forwards tool calls and prompt requests to the upstream, returns results
- Serves everything over stdio
No hardcoded tool definitions — if Mendix adds new tools or prompts, they appear automatically.
Environment variables
| Variable | Required | Description |
|---|---|---|
MENDIX_PAT |
Yes | Mendix Personal Access Token |
MENDIX_MCP_URL |
No | Override upstream URL (default: https://marketplace.mendix.com/mcp-server/mcp) |
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