Full read-write Claude connector for PostgreSQL
Let Claude run scoped reads and writes against your PostgreSQL data
Stop switching into psql or a SQL client to query and fix data. Claude runs parameterized queries, inserts and updates rows, and applies migrations against scoped database credentials, with deletes and schema changes gated behind your approval.
PostgreSQL is the open-source relational database many teams use to store their application and operational data. People want Claude to do real work against it: run queries, inspect schema, and make changes like inserting rows or running a migration without leaving the conversation.
What is a PostgreSQL MCP server?
A PostgreSQL MCP server is a small hosted service that exposes PostgreSQL's data and actions to Claude over the Model Context Protocol, so Claude can records, tables, and queries inside your own account. We build it as a custom connector with separate read and write tools, and destructive actions stay gated behind your approval.
What can PostgreSQL's current connector do today?
Today, most ways to connect Claude to PostgreSQL are read-leaning: Claude can often run SELECT queries and describe tables, but inserts, updates, deletes, and schema changes are usually held back or out of reach. A custom PostgreSQL connector adds those write actions behind scoped database access and human-in-the-loop controls.
What does full read-write PostgreSQL access unlock?
Full read-write PostgreSQL access lets Claude query a table, insert or update rows, run a parameterized migration, and correct bad data once you approve. The database work that used to mean switching into psql or a SQL client happens where you are already describing the change in plain language.
- Insert a new row into a specified table with given column values
- Update or correct records that match a stated condition after approval
- Run a parameterized query to fetch and summarize rows
- Apply a schema migration such as adding a column or index
- Delete rows matching a precise filter once you confirm
- Inspect table schema, constraints, and indexes to plan a change
Can Claude write to a PostgreSQL database, not just query it?
Yes, Claude can write to a PostgreSQL database with a custom connector, not just query it. Insert tools add rows with given column values, and update tools correct records that match a stated condition after you approve. Most default connections are read-leaning, so writing needs a purpose-built connector with the right database privileges.
Can Claude run a migration in PostgreSQL?
Claude can run a migration in PostgreSQL, such as adding a column or an index, exposed as a separate write tool. It can first inspect table schema, constraints, and indexes to plan the change, then apply a parameterized migration. Schema changes are gated, so the statement runs only once you confirm it.
Will Claude delete rows in PostgreSQL without my approval?
No, Claude will not delete rows without your approval. Deletes and schema changes are separate, gated write tools: Claude drafts the statement and shows exactly which rows or columns it targets, but it runs only after you confirm. Claude never gets more access than the database role you grant.
How a PostgreSQL connector works
We build a small MCP server that connects to PostgreSQL with scoped database credentials, granting only the privileges and tables the work needs. Read tools (query, describe schema) and write tools (insert, update, migrate) are separated, and destructive actions like delete or schema changes require your confirmation. For self-hosted databases, access can be locked to an allowlisted IP behind your firewall, and Claude never has more privileges than the database role you grant.
Frequently asked questions
Can Claude write to a PostgreSQL database, not just run SELECT queries?
Will Claude delete rows or alter a table without my approval?
How does Claude connect to a self-hosted PostgreSQL database securely?
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