Agentic Mermaid for ChatGPT

io.github.adewale/agentic-mermaid

Render, verify, describe, and safely edit Mermaid diagrams through MCP.

client:ChatGPT transport:streamable-http runtime:npm tools:9

Install Agentic Mermaid in ChatGPT

Settings → Connectors → Advanced → Developer mode

https://agentic-mermaid.dev/mcp

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