# X_MCP_PATH_DUPLICATE

## Means

two MCP endpoints claim one path

## Typical cause

`apps/<app>/mcp.ts` exports `mcp` as an array and two endpoints resolve to one `POST` path — a second `defineAppMcp` with no `path` defaults to `/mcp` — or to one RFC 9728 metadata path. Thrown at boot by the web role (`x dev` and `runRole` alike): one URL cannot answer two populations with two catalogs

## Fix

give each `defineAppMcp` after the first its own `path: '/mcp/admin'`; every endpoint mounts at its own `defineAppMcp` path (default `/mcp`)

[MCP and AI](/error-codes#mcp-and-ai)