ChatGPT Diagrams MCP Resource/edge_reference
How to: ChatGPT Diagrams MCP edge_reference
Add Diagrams MCP to ChatGPT
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01
Open Settings → Connectors → Advanced → Developer mode and merge this in. Keep any servers already there.
https://diagrams-mcp-production.up.railway.app/mcp-
02
Save the file and restart ChatGPT.
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03
edge_reference is surfaced wherever your client lets you attach context. It is context to attach, not an action to run.
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04
If it does not appear, check that Diagrams MCP is connected and that you are looking at its resources rather than its tools.
Custom connectors are a paid-plan feature and take a remote URL only. ChatGPT cannot run a packaged server locally. ChatGPT docs
Same resource, other clients
Read from the server itself, by connecting to it and calling resources/list on 24 September 2026.
A listing does not declare its resources, so asking is the only way to know them, and this
is what the server actually offers rather than what its listing claims. Names only are
stored; connect the server for each resource's type and contents.