DBHub (by Bytebase) is a free, open-source (MIT license) universal database gateway implementing Model Context Protocol (MCP) for AI assistant integration. The tool enables AI assistants like Claude, ChatGPT, and custom applications to query databases through a standardized protocol without custom integration code. Supports PostgreSQL, MySQL, MariaDB, SQL Server, SQLite, Oracle, and DuckDB. Two core tools exposed: execute_sql (run queries) and search_objects (explore schema). Configuration via connection string or DSN in Claude Desktop, VS Code, or custom MCP clients. Demo available at demo.dbhub.ai for testing without local setup. Security considerations: configure read-only database users, use connection limits, and consider query allow-lists for production. The MCP specification (Anthropic) enables AI models to access external tools and data sources in standardized way. Page should cover: MCP concept explanation, supported databases and connection setup, Claude Desktop integration tutorial, security best practices, comparison with custom database integrations, and use cases for AI-augmented database access.