PostgreSQL Multi-Schema MCP Server

What is PostgreSQL Multi-Schema MCP Server?

A Model Context Protocol server that provides read-only access to PostgreSQL databases with enhanced multi-schema support. It allows LLMs to inspect database schemas across multiple namespaces and execute read-only queries while maintaining schema isolation.

How to use PostgreSQL Multi-Schema MCP Server?

Run the server via npx -y mcp-server-postgres-multi-schema <database-url> [schemas], where schemas is an optional comma-separated list (defaults to public). For Claude Desktop, add an entry to claude_desktop_config.json under mcpServers with the command and arguments.

Key features of PostgreSQL Multi-Schema MCP Server

• Multi-schema support via command-line configuration
• Schema isolation with strict access control
• Cross-schema discovery with unified table view
• Metadata security filtering system catalogs
• Read-only query execution within READ ONLY transactions
• Automatic table schema discovery per authorized schema

Use cases of PostgreSQL Multi-Schema MCP Server

• Let an LLM browse and query databases with multiple schemas (e.g., public, analytics, staging)
• Provide read-only database access for AI assistants without write risk
• Enable cross-schema data discovery for documentation or analysis
• Use in Claude Desktop to interact with PostgreSQL data via natural language

FAQ from PostgreSQL Multi-Schema MCP Server

What schemas does the server expose?

The server exposes only the schemas specified via the command-line argument. If none are given, it defaults to the public schema.

What type of queries can I execute?

Only read‑only SQL queries are allowed. All queries run inside a READ ONLY transaction, preventing any writes.

How do I configure the server with Claude Desktop?

Add an mcpServers entry in claude_desktop_config.json with command npx -y mcp-server-postgres-multi-schema and arguments including the database URL and optional schema list.

Does the server expose system tables?

No. The server filters system catalogs to expose only user-defined tables in the authorized schemas.

Is the server limited to a single schema?

No. You can pass a comma-separated list of schemas (e.g., public,analytics,staging) to access multiple namespaces.