OmniSQL MCP

Universal database MCP server — give AI assistants read/write access to your databases using connections already saved in your local DB client workspace (DBeaver-compatible).

Database Support

Natively supported (direct driver, fast):

• PostgreSQL (via pg)

• MySQL / MariaDB (via mysql2)

• SQL Server / MSSQL (via mssql)

• SQLite (via sqlite3 CLI)

Postgres-compatible (routed through pg driver automatically):

• CockroachDB, TimescaleDB, Amazon Redshift, YugabyteDB, AlloyDB, Supabase, Neon, Citus

Other databases: Fall back to an external CLI configured via OMNISQL_CLI_PATH. Results vary by CLI.

Related MCP server: MySQL MCP Server

Features

• Reuses connections already configured in your local DB client workspace — no duplicate setup

• Native query execution for PostgreSQL, MySQL/MariaDB, SQLite, SQL Server

• Connection pooling with configurable pool size and timeouts

• Transaction support (BEGIN/COMMIT/ROLLBACK)

• Query execution plan analysis (EXPLAIN)

• Schema comparison between connections with migration script generation

• Read-only mode with enforced SELECT-only on execute_query

• Connection whitelist to restrict which databases are accessible

• Tool filtering to disable specific operations

• Query validation to block dangerous operations (DROP DATABASE, TRUNCATE, DELETE/UPDATE without WHERE)

• Data export to CSV/JSON

• Graceful shutdown with connection pool cleanup

Requirements

• Node.js 18+

• A local DB client (DBeaver-compatible) with at least one configured connection

Installation

npm install -g omnisql-mcp

Configuration

Claude Desktop

Add to ~/Library/Application Support/Claude/claude_desktop_config.json (macOS):

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp"
    }
  }
}

Claude Code

Add to ~/.claude/settings.json:

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp"
    }
  }
}

Cursor

Add to Cursor Settings > MCP Servers:

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp"
    }
  }
}

Environment Variables

Read-Only Mode

Blocks all write operations. The execute_query tool only allows SELECT, EXPLAIN, SHOW, and DESCRIBE statements. Transaction tools are disabled entirely.

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp",
      "env": {
        "OMNISQL_READ_ONLY": "true"
      }
    }
  }
}

Connection Whitelist

Restrict which workspace connections are visible. Accepts connection IDs or display names, comma-separated:

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp",
      "env": {
        "OMNISQL_ALLOWED_CONNECTIONS": "dev-postgres,staging-mysql"
      }
    }
  }
}

Disable Specific Tools

{
  "mcpServers": {
    "omnisql": {
      "command": "omnisql-mcp",
      "env": {
        "OMNISQL_DISABLED_TOOLS": "drop_table,alter_table,write_query"
      }
    }
  }
}

Available Tools

Connection Management

• list_connections - List all database connections

• get_connection_info - Get connection details

• test_connection - Test connectivity

Data Operations

• execute_query - Run read-only queries (SELECT, EXPLAIN, SHOW, DESCRIBE only)

• write_query - Run INSERT/UPDATE/DELETE

• export_data - Export to CSV/JSON

Schema Management

• list_tables - List tables and views

• get_table_schema - Get table structure

• create_table - Create tables

• alter_table - Modify tables

• drop_table - Drop tables (requires confirmation)

Transactions

• begin_transaction - Start a new transaction

• execute_in_transaction - Execute query within a transaction

• commit_transaction - Commit a transaction

• rollback_transaction - Roll back a transaction

Query Analysis

• explain_query - Analyze query execution plan

• compare_schemas - Compare schemas between two connections

• get_pool_stats - Get connection pool statistics

Other

• get_database_stats - Database statistics

• append_insight - Store analysis notes

• list_insights - Retrieve stored notes

Security

• Read-only enforcement: execute_query only accepts read-only statements (SELECT, EXPLAIN, SHOW, DESCRIBE, PRAGMA). Write operations must use write_query.

• Query validation: Blocks DROP DATABASE, DROP SCHEMA, TRUNCATE, DELETE/UPDATE without WHERE, GRANT, REVOKE, and user management statements.

• Connection whitelist: Restrict which connections are exposed via OMNISQL_ALLOWED_CONNECTIONS.

• Tool filtering: Disable any tool via OMNISQL_DISABLED_TOOLS.

• Input sanitization: Connection IDs and SQL identifiers are sanitized to prevent injection.

• Recommendation: For production use, also use a database-level read-only user for defense in depth.

Workspace Format Support

Supports both configuration formats written by DBeaver-compatible DB clients:

• Legacy: XML config in .metadata/.plugins/org.jkiss.dbeaver.core/

• Modern: JSON config in General/.dbeaver/

Credentials are automatically decrypted from the workspace credentials-config.json.

Development

git clone https://github.com/srthkdev/omnisql-mcp.git
cd omnisql-mcp
npm install
npm run build
npm test
npm run lint

License

MIT