# X_MCP_NOT_BRANCH_DB

## Means

`db.migrate` was aimed at a database that is not a branch

## Typical cause

a production-tagged target, or any shared/long-lived database

## Fix

`x db branch create <name>   # then retry db.migrate` — the guidance rides behind `#` so the whole line pastes into a shell. A production target gets the other half of the refusal instead: `run migrations in production through the migrate role: ROLE=migrate in your deploy hook`

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