MCP Integration

Connect PostgreSQL to Codex

Query your PostgreSQL data directly from Codex using Sequel’s MCP server. Ask questions in plain English — no SQL, no dashboards, no context switching.

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How it works

Three steps to get started

Connect PostgreSQL to Sequel

In your Sequel dashboard, go to Connections and add PostgreSQL. Sequel handles authentication and schema discovery automatically.

Add the MCP config

Copy the Sequel MCP configuration into Codex's settings file (shown below). Swap in your API key from Settings → API Keys.

Ask Codex about your data

Restart Codex and start asking questions. "How many rows are in each table?" — and get a real answer backed by live PostgreSQL data.

Configuration

Add Sequel to Codex

Place this in ~/.codex/config.yaml and replace sql_your_api_key with a key from Settings → API Keys.

~/.codex/config.yaml

mcp_servers:
  sequel:
    type: http
    url: https://api.sequel.sh/mcp
    headers:
      Authorization: "Bearer sql_your_api_key"

Example prompts

Questions you can ask Codex

“How many rows are in each table?”

“Show me the 10 most recently created users”

“What's the average order value by customer segment?”

“Which products have never been ordered?”

“Show me monthly revenue broken down by plan type”

“Find duplicate email addresses in the users table”

“What percentage of orders are in each status?”

“Show me the top 10 customers by lifetime value”

Frequently asked questions

How do I connect PostgreSQL to Codex?

You need two things: (1) connect PostgreSQL to Sequel in your Sequel dashboard under Connections, and (2) add the Sequel MCP config to Codex using the setup shown above. Once both are done, Codex can query your PostgreSQL data directly.

What PostgreSQL data can Codex access?

Codex can access any data available through your PostgreSQL connection in Sequel. Use Sequel's search tool to discover available metrics and dimensions, then execute queries to pull the data you need.

Is my PostgreSQL data sent to Codex's servers?

Query results are returned to Codex as context within your conversation. Only the data you explicitly ask about is retrieved. Sequel never stores your query results permanently — they exist only for the duration of the tool call.

Do I need a Sequel account?

Yes. You need a Sequel account to connect PostgreSQL and generate an API key. Sign up free at sequel.sh — no credit card required. Then create a connection to PostgreSQL and generate an API key from Settings → API Keys.

Can I connect multiple PostgreSQL accounts?

Yes. Sequel supports multiple connections of the same type. If you have multiple PostgreSQL accounts or properties, add each as a separate connection in Sequel. Codex will be able to query all of them.

Connect PostgreSQL to other AI tools

PostgreSQL → Claude PostgreSQL → Cursor PostgreSQL → ChatGPT PostgreSQL → VS Code PostgreSQL → Windsurf PostgreSQL → Zed PostgreSQL → Gemini PostgreSQL → Claude Code

Connect other sources to Codex

Google Analytics

Google Search Console

Connect PostgreSQL to Codex today

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