Add multi-MCP server support to Copilot chat#715
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Copilot can now connect to additional MCP servers beyond the built-in Unchained one. Users can add, remove, and toggle external MCP servers from a new settings panel in the Copilot header — the engine handles all connections server-side, so there are no API keys or CORS issues on the frontend.
On the engine side, both Fastify and Express chat handlers now accept an optional
mcpServersarray in the request body. Tools from all connected servers are aggregated (prefixed with the server name when multiple are active), and resources are merged into the system prompt. The connection logic was extracted into a sharedconnectMCPServershelper to keep both handlers clean.The built-in Unchained MCP server is always connected — extra servers just augment what's available to the AI.