Add Postproxy to .cursor/mcp.json
Cursor reads MCP servers from `.cursor/mcp.json`. Add the Postproxy server with your API key and reload — the tools appear in the composer.
.cursor/mcp.json
{ "mcpServers": { "postproxy": { "url": "https://mcp.postproxy.dev/mcp?api_key=YOUR_KEY" } }}