Connect BigQuery 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.
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"Example prompts
Questions you can ask Codex
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 other AI tools
Connect other sources to Codex
Connect BigQuery to Codex today
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