PostgreSQL
Model Context ProtocolRuns read-only SQL against a Postgres database and returns the schema alongside results, which is what makes it usable without pasting table definitions into the prompt
PostgreSQL vs MongoDB MCP
Runs read-only SQL against a Postgres database and returns the schema alongside results, which is what makes it usable without pasting table definitions into the prompt On the other side: exposes collections, indexes, and aggregation pipelines so an agent can inspect a database instead of guessing its shape
Installnpx -y postgresql://localhost/mydbnpx -y setup
SourceOfficialOfficial
Deciding factorThe schema is stable and the questions are joins and aggregates.versus: The data is document-shaped and the schema varies by collection.
Bottom line
Postgres unless the data is genuinely document-shaped.
The short answer
Relational versus document, which decides what the agent can safely ask. Postgres rewards a read-only role and known schema; MongoDB's schema flexibility means the agent discovers the shape at query time, which is useful and easy to misread. Both are read-first tools in practice.
Facts
| Option | Install | Source | Link |
|---|---|---|---|
| PostgreSQL | npx -y postgresql://localhost/mydb | Official | Repository ↗ |
| MongoDB MCP | npx -y setup | Official | Repository ↗ |
Pick PostgreSQL if
The schema is stable and the questions are joins and aggregates.
Pick MongoDB MCP if
The data is document-shaped and the schema varies by collection.
What would change our mind
A project going archived, or a maintainer changing the install path, flips this comparison faster than any feature release. Both entries are re-checked weekly, and the date above tells you how much to trust the details.
Read the full entries
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