Clivern/Leif

Stdio MCP server for local PostgreSQL. Tools: list_tables, describe_table, query.

go run . serve --dsn 'postgres://[email protected]:5432/dbname?sslmode=disable'

Or set DATABASE_URL and run go run . serve.

.cursor/mcp.json in the app repo:

{
  "mcpServers": {
    "leif": {
      "command": "go",
      "args": ["run", "/absolute/path/to/leif", "serve"],
      "env": {
        "DATABASE_URL": "postgres://[email protected]:5432/dbname?sslmode=disable"
      }
    }
  }
}

On PATH: "command": "leif", "args": ["serve"]. Reload, then enable it in Settings → MCP.

Workspace .cursor/mcp.json overrides ~/.cursor/mcp.json. To keep the DSN out of git, use "DATABASE_URL": "${env:DATABASE_URL}".

Use Leif to list tables, then describe public.orders.

Optional .cursor/rules/leif.mdc so it does this without being asked:

---
description: Use Leif for PostgreSQL questions
alwaysApply: true
---

Use Leif MCP tools for schema and data. Call `list_tables` or `describe_table` before SQL, then `query`.