I work on Callejear, an independent project for exploring municipal data in Spain. We recently exposed a read-only MCP service for Madrid. The useful engineering lesson was that making data callable is only part of the job: the response contract must also prevent an assistant from drawing concl...
Source: [Dev.to](https://dev.to/yoel_castao_d5cdcbe81850/building-a-read-only-city-data-mcp-street-identity-missing-data-and-honest-comparisons-fcd)