litmus for ChatGPT

io.github.polygraphso/litmus

Grade MCP servers A to F with the open behavioral litmus. npm: full toolset; hosted: lookups only.

client:ChatGPT transport:streamable-http runtime:npm tools:3

Install litmus in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://polygraph.so/api/mcp

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