How to Connect MCP Server MCP to Codex

Query your MCP Server 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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Example prompts

Everything you can ask Codex about your MCP Server data.

Ask in plain English — Sequel translates it into a MCP Server query, runs it, and Codex hands back the answer. No SQL, no dashboards, no CSV exports.

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What you can ask Codex

What tools does this MCP server provide?
Run the search tool and find recent news about AI
Combine results from two different tools into a single answer
What data can I query through this server?
Call the analytics tool and show me this week's summary

How it works

Three steps to get started

Connect MCP Server to Sequel

In your Sequel dashboard, go to Connections and add MCP Server. 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. "What tools does this MCP server provide?" — and get a real answer backed by live MCP Server 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"

Sequel CLI

Install MCP Server MCP to Codex

The Sequel CLI installs MCP Server into Codex in one step — it signs you in, provisions a scoped API key, and writes the right config to the right place. No keys to copy by hand.

Prefer npm? npm install -g @sequelsh/cli@latest works too.

1
Install the Sequel CLI
One line installs the latest CLI with whatever package manager you have.
```
curl -fsSL https://sequel.sh/install | sh
```
2
Sign in
Authenticate in your browser and pick an organization.
```
sequel login
```
3
Install into Codex
One command installs Sequel into Codex and writes its MCP config.
```
sequel install codex
```

Other AI agents

Connect MCP Server MCP to any agent

Claude

Use Claude to query your databases, explore schemas, and build analyses — all from one conversation.

Cursor

Query your databases and explore schemas without leaving your code editor.

ChatGPT

Connect ChatGPT to your databases and get data-backed answers in every conversation.

VS Code

Get database access inside VS Code Copilot without leaving your editor.

Windsurf

Give Windsurf's Cascade AI access to your databases — query data without leaving your editor.

Zed

Connect Zed's AI assistant to your databases for real-time data access while you code.

Gemini

Connect Google Gemini to your databases for grounded, data-backed answers.

Claude Code

Query your databases directly from the Claude Code CLI — without leaving your terminal.

Codex

Give OpenAI Codex CLI real-time database access for data-grounded coding sessions.

OpenClaw

Turn your self-hosted OpenClaw agent into a data analyst that queries every source you've connected.

Hermes

Give Nous Research's Hermes agent read access to every database and marketing tool you've connected.

Other data sources

Connect other sources to Codex

PostgreSQL

Query your PostgreSQL database in plain English. No SQL required.

MySQL

Instant insights from your MySQL database. Ask in plain English.

ClickHouse

Real-time analytics on ClickHouse at any scale, in plain English.

BigQuery

Query petabytes of BigQuery data in plain English.

Google Sheets

Query, write, and manage Google Sheets with AI.

Google Analytics 4

Ask your GA4 data anything. No SQL, no dashboards.

Google Search Console

Unlock your SEO data with natural language. No exports, no pivot tables.

Stripe

Ask your Stripe data anything. MRR, churn, refunds — answered in plain English.

PostHog

Ask your PostHog product data anything — with HogQL under the hood.

Mixpanel

Conversational analytics on your Mixpanel events, funnels, and retention.

Amplitude

Query your Amplitude taxonomy, funnels, and dashboards in plain English.

HubSpot

Your AI analyst for HubSpot — contacts, deals, tickets, and pipelines.

Ahrefs

Ask your Ahrefs SEO data anything — backlinks, keywords, and traffic.

Apollo.io

Ask your Apollo.io prospects, contacts, and accounts anything — in plain English.

Frequently asked questions

How do I connect MCP Server to Codex?

You need two things: (1) connect MCP Server 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 MCP Server data directly.

What MCP Server data can Codex access?

Codex can access any data available through your MCP Server 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 MCP Server 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 MCP Server and generate an API key. Sign up free at sequel.sh — no credit card required. Then create a connection to MCP Server and generate an API key from Settings → API Keys.

Can I connect multiple MCP Server accounts?

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

Connect MCP Server to Codex today

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