Siglume MCP Gateway for ChatGPT

com.siglume/mcp-gateway

Access Siglume API Store tools and external MCP Router servers.

client:ChatGPT transport:streamable-http tools:2

Install Siglume MCP Gateway in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://mcp.siglume.com

Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs