PostgreSQL (MCP) MCP Server Integration Guide
Quick Start Architecture Summary
The PostgreSQL (MCP) MCP server is a Model Context Protocol integration that connects AI assistants (Claude Desktop, Cursor IDE, VS Code, Zed) to the PostgreSQL (MCP) API through natural language directives. It exposes 2 API operations as callable MCP tools, including Execute SQL query, Get database schema. Authentication requires Database Credentials credentials configured via environment variables. Sourced from the official PostgreSQL (MCP) OpenAPI specification (v16) with an overall quality score of 70/99.
Technical Overview & Protocol Integration
Query and manage PostgreSQL databases directly from your AI agent. Read schemas, run queries, and manage data.
By converting the OpenAPI 3.0 specification for PostgreSQL (MCP) into native Model Context Protocol (MCP) tool definitions, developers and AI agents gain programmatic access to endpoints over stdio or HTTP transports. Every endpoint is translated into a discrete tool payload complete with input argument validation, parameter descriptions, and return type definitions.
This setup enables LLM agents to execute multi-step workflows, search records, mutate state, and analyze responses safely within local desktop client sessions like Claude Desktop and Cursor IDE.
2. Technical Specifications Matrix
System Specifications
| API Name | PostgreSQL (MCP) |
| Slug Identifier | postgres |
| Category | Databases |
| Auth Method | Database Credentials |
| Endpoint Count | 2 tools mapped |
| Spec Version | OpenAPI v16 |
| Transport Type | STDIO |
| Publisher Source | official |
3. Multi-Client Installation Matrix
Copy and paste these pre-formatted JSON snippets into your MCP client configuration files.
Claude Desktop
Add to claude_desktop_config.json
{
"mcpServers": {
"postgres": {
"command": "npx",
"args": [
"-y",
"@modelcontextprotocol/server-postgres"
],
"env": {
"DATABASE_URL": "postgresql://user:pass@host:5432/db"
}
}
}
}Cursor IDE
Settings → MCP Servers → Add Hosted Config
{
"mcpServers": {
"postgres": {
"url": "https://mcpbridge.org/config/postgres.json"
}
}
}Saves as .cursor/mcp.json in the download. Move it to your project root.
VS Code / Cline
Use with MCP extension config
{
"mcpServers": {
"postgres": {
"url": "https://mcpbridge.org/config/postgres.json"
}
}
}4. Environment Variables & Authentication Reference
Key parameters and credential variable mappings for PostgreSQL (MCP).
| Variable Name | Required | Example Value |
|---|---|---|
| DATABASE_URL | REQUIRED | postgresql://user:pass@host:5432/db |
5. Endpoints & Tool Schemas Matrix
Search and inspect the 2 tool signatures mapped from OpenAPI.
Executable Code Integration Examples
Call PostgreSQL (MCP) endpoints via cURL, TypeScript, or Python REST SDKs.
curl -X POST "https://api.example.com/query" \ -H "Content-Type: application/json" \ -H "Authorization: YOUR_API_KEY"
6. Real-World AI Assistant Prompts
Prompt directives for invoking PostgreSQL (MCP) operations inside AI client chats.
1. Information Search & Resource Querying
Read Query"Use PostgreSQL (MCP) MCP server tools to search resources matching path '/query' and summarize available properties."
2. Action Execution & API Payload Creation
Action Execution"Call PostgreSQL (MCP) operation '/query' with parameters configured for environment testing."
3. Multi-Step API Workflow Automation
Workflow Automation"Inspect recent responses from PostgreSQL (MCP) API, extract target identifiers, and format a clean diagnostic report."
4. Introspection & Schema Audit
Introspection"Retrieve the full OpenAPI tool schema list for PostgreSQL (MCP) MCP server and generate a technical summary of capabilities."
7. Error Resolution & Troubleshooting Guide
HTTP status codes and JSON-RPC protocol error resolution matrix.
400 Bad RequestRoot Cause: Malformed request payload parameters or missing required JSON Schema fields.
Resolution Action: Verify request schema in Section 5 tool specifications before calling operation.
401 UnauthorizedRoot Cause: Missing or invalid API key credentials in MCP environment config.
Resolution Action: Define required key in client config under env object.
403 ForbiddenRoot Cause: Insufficient scope permissions or unauthorized resource access.
Resolution Action: Check key permissions in developer control panel.
404 Not FoundRoot Cause: Resource URL path or requested target ID does not exist.
Resolution Action: Inspect path parameters and resource ID values.
429 Rate Limit ExceededRoot Cause: Upstream API rate limit quota exceeded.
Resolution Action: Implement exponential backoff retry in tool execution loop.
500 Internal Server ErrorRoot Cause: Upstream service runtime fault or stdio process crash.
Resolution Action: Inspect STDIO stderr output stream for diagnostic trace.
8. Quality Scorecard & Audit Metadata
Automated evaluation metrics for OpenAPI specification quality.
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