Custom MCP

Add MCP servers that are not in the Extensions catalog (command, URL, or config).

When to use Custom MCP

Your own MCP server binary / npx package
Remote SSE / HTTP MCP endpoints
Fine-grained env and args

For packaged catalogs, prefer Extensions.

Typical steps

Open Extensions (or the custom server entry point in that screen).
Add a custom server: command + args, or URL.
Set environment variables if required.
Save and attach to an assistant.
Start a Chat session and confirm tools load.

Exact form labels depend on version — look for Add / Custom near the Extensions list.

Tips

Absolute paths are more reliable than PATH-only commands.
If Node/Python is missing, run App Wizard first.
Never paste secrets into Chat; put them in server env fields.

Extensions · Troubleshooting