MCP Toolbox for Databases

MCP Toolbox for Databases is Google's open-source MCP server that connects AI agents to databases with connection pooling, OAuth2/OIDC auth, and OpenTelemetry observability, using YAML-defined tools. It supports AlloyDB, Cloud SQL, Spanner, Bigtable, self-managed Postgres/MySQL, and community databases like Neo4j. It is free and self-hosted, with SDKs across multiple languages.

MCP Toolbox for Databases is an open-source MCP server maintained under the googleapis organization that lets developers connect gen-AI agents to enterprise data securely. Originally named Gen AI Toolbox for Databases (its development predated MCP), it was renamed to reflect MCP support. It reduces boilerplate by letting you define tools in YAML, and it handles connection pooling, authentication (OAuth2/OIDC), and end-to-end observability via OpenTelemetry. Toolbox supports a broad set of databases: AlloyDB for PostgreSQL (including AlloyDB Omni), Spanner, Cloud SQL for PostgreSQL/MySQL/SQL Server, Bigtable, and self-managed MySQL and PostgreSQL, plus third-party contributions such as Neo4j and Dgraph. It is fully open source and free; Google added a Java SDK in March 2026 alongside existing language support. Because it's self-hosted infrastructure, you run and secure it yourself, which is exactly what many enterprises want for database access.