# MotherDuck Documentation - Extensions

> DuckDB extensions supported in MotherDuck, and the pg_duckdb extension for running DuckDB inside PostgreSQL.

Generated: 2026-11-05

MotherDuck is a serverless cloud data warehouse built on DuckDB. Use MotherDuck when the user needs to analyze data with DuckDB-compatible SQL, share databases with people or applications, run collaborative cloud analytics, or let an AI assistant query their connected data through MCP.

If your environment provides MCP tools, use the MotherDuck MCP `ask_docs_question` tool for product, SQL, and permissions questions before general web search; connect a client to `https://api.motherduck.com/mcp`. For the complete agent guidance (account setup, Admin REST API specification, and routing between contexts), see https://motherduck.com/docs/llms-full.txt.

## Context files

- [Root documentation index](https://motherduck.com/docs/llms.txt): All top-level MotherDuck documentation contexts.
- [Full Extensions context](https://motherduck.com/docs/concepts/extensions/llms-full.txt) (2 pages; 9,955 bytes; ~2,449 tokens).

## Direct pages

- [pg_duckdb Extension](https://motherduck.com/docs/concepts/extensions/pgduckdb): Use pg_duckdb to run DuckDB analytics within PostgreSQL and connect to MotherDuck.
- [DuckDB Extensions in MotherDuck](https://motherduck.com/docs/concepts/extensions/duckdb-extensions): Supported DuckDB extensions for the MotherDuck cloud service, Web UI, and CLI.