MCP SERVER · OAUTH · READ-ONLY
AI2SQL is a hosted MCP server that connects Claude, ChatGPT, Cursor and VS Code to your PostgreSQL, MySQL or SQL Server database. Sign in with your AI2SQL account and your assistant writes SQL against the real schema and runs it read-only, inside the chat you already use.
Live querying for PostgreSQL, MySQL and SQL Server. No API key to paste.
SETUP
https://builder.ai2sql.io/api/chatgpt-mcp Open the Add custom connector dialog in Claude.
Open in Claude ↗Claude Desktop: Settings → Connectors → Add custom connector. Custom connectors need Claude Pro, Max, Team or Enterprise.
Name it AI2SQL, paste the server URL above, leave Client ID and Secret empty, and press Continue.
Press Connect. A builder.ai2sql.io tab asks you to sign in (or create an account), then Allow. Back in Claude, 8 tools are live.
Try: "Which databases do I have connected?" then "Show me the schema of <name> and list last month's orders."
Streamable HTTP with OAuth 2.1 and dynamic client registration. Add this to your client's MCP config; it will prompt you to sign in.
{
"mcpServers": {
"ai2sql": {
"url": "https://builder.ai2sql.io/api/chatgpt-mcp"
}
}
}8 TOOLS
You never pick a tool. Say what you need and the assistant chooses; these are the calls it can make.
Every plan.
generate_sql — Plain English → SQL in the dialect you name, against your real schema when a connection is picked.fix_sql — Paste a failing query and its error; get the corrected statement and why it broke.optimize_sql — Slow query in, faster query out, with the reasoning and index hints.explain_sql — Line-by-line explanation of what a query does.convert_sql — Translate between PostgreSQL, MySQL, SQL Server, Oracle, Snowflake, BigQuery, SQLite, MariaDB.Connections you set up at ai2sql.io.
list_connections — The databases you connected at ai2sql.io: id, name, type.describe_schema — Tables and columns of one connection, so SQL uses real names.run_query — Runs one SELECT / WITH read-only and returns up to 1,000 rows. Paid plans.HOW IT STAYS SAFE
Your assistant signs in with your AI2SQL account (OAuth 2.1 with PKCE). Access tokens last an hour and refresh for 30 days. Disconnect in your client any time.
Our server classifies every statement first. Only a single SELECT or WITH passes; writes, DDL, batches and dangerous functions are refused with a clear error.
1,000 rows per query, 10-second timeout, one short-lived connection per call. Your credentials stay encrypted on our side; the assistant only ever sees results.
DATABASES
SQL is written for Oracle, Snowflake, BigQuery, SQLite and MongoDB too, but live querying for those is not available yet.
PLANS
run_query on your connected databases.
No browser to sign in with? The API-key server at builder.ai2sql.io/api/mcp exposes
list_connections, describe_schema and run_query with an X-API-Key header, metered per key.
COMPARED
| AI2SQL MCP | Self-hosted DB MCP server | |
|---|---|---|
| Setup | Add one URL, sign in with OAuth | Install locally, put database credentials in a config file |
| Databases | PostgreSQL, MySQL, SQL Server from one server | Usually one engine per server |
| Write protection | Server-side statement guard, cannot be turned off by the assistant | Depends on the server and on the database user you configure |
| SQL help | generate, fix, optimize, explain, convert built in | Query execution only |
| Works in claude.ai and ChatGPT | Yes, hosted with OAuth | Local servers only work in desktop and IDE clients |
Longer comparison: AI2SQL Gateway vs the Postgres MCP server.
Last updated 2 September 2026.
Add the AI2SQL MCP server as a custom connector in Claude (Customize → Connectors → Add), paste https://builder.ai2sql.io/api/chatgpt-mcp, and sign in with your AI2SQL account. Claude can then list your connected databases, read their schema and run read-only queries. Works in claude.ai, Claude Desktop and Claude Code.
Yes, with developer mode on ChatGPT Plus, Pro, Team, Enterprise or Edu. Create a plugin pointing at the AI2SQL MCP server URL with OAuth authentication, connect, and ChatGPT can describe your schema and run read-only SQL on PostgreSQL, MySQL or SQL Server connections you set up in the AI2SQL dashboard.
AI2SQL is one: its MCP server exposes generate_sql, fix_sql, optimize_sql, explain_sql and convert_sql alongside list_connections, describe_schema and run_query. The assistant picks the tool from what you ask; you never call a tool by name.
No. Every tool is read-only. run_query accepts a single SELECT or WITH statement; INSERT, UPDATE, DELETE, DDL and multi-statement batches are rejected on the AI2SQL server before anything reaches your database.
Not for Claude, Cursor, VS Code or ChatGPT. Those sign in with your AI2SQL account over OAuth 2.1. Nothing is pasted anywhere except the server URL. API keys remain available for scripts and custom agents through the separate server at builder.ai2sql.io/api/mcp.
Yes. Cursor and VS Code (GitHub Copilot agent mode) both support remote MCP servers with OAuth. The install buttons on this page add the server in one click; the client then asks you to sign in to AI2SQL.
Live schema browsing and run_query work for PostgreSQL, MySQL, MariaDB and Microsoft SQL Server connections. Snowflake, MongoDB, Oracle and others still get SQL written for them, but live querying for those is not available yet.
Pasting a schema gives the model a snapshot it cannot verify or run. Through MCP the assistant reads the current schema itself, executes the query read-only and answers with real rows, and the schema never has to be copied into a chat.
Sign in, list your connections, browse schemas and make 5 SQL requests a day, shared with the AI2SQL web app. Running queries against a connected database is part of the paid plans (Start $9, Pro $19, Team $39 per month).
In the AI2SQL dashboard at builder.ai2sql.io. Your AI assistant only sees connections you have already set up there. Databases on your own machine go through the AI2SQL Connector desktop app.
Custom connectors need Claude Pro, Max, Team or Enterprise. ChatGPT needs developer mode, available on Plus, Pro, Team, Enterprise and Edu. Claude Code, Cursor and VS Code have no plan requirement for MCP servers.
Connect a database at ai2sql.io, then add the server to your assistant. Two minutes, no keys.