How to Connect BigQuery MCP to Codex

Query your BigQuery 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 BigQuery data.

Ask in plain English — Sequel translates it into a BigQuery 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 are the top 10 events by count this week?
Show me daily revenue for the past 30 days as a line chart
Which users had the highest session count last month?
What's the p95 query latency by dataset over the past 7 days?
List all tables in my analytics dataset with row counts

How it works

Three steps to get started

Connect BigQuery to Sequel

In your Sequel dashboard, go to Connections and add BigQuery. 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 are the top 10 events by count this week?" — and get a real answer backed by live BigQuery 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 BigQuery MCP to Codex

The Sequel CLI installs BigQuery 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 BigQuery 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.

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.

MCP Server

Connect any MCP-compatible server and query it with AI in seconds.

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 BigQuery to Codex?

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

What BigQuery data can Codex access?

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

Can I connect multiple BigQuery accounts?

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

Connect BigQuery to Codex today

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