How to Connect Cloudflare D1 to Codex

Query your Cloudflare D1 data directly from Codex using Sequel’s MCP server. Ask questions in plain English, with no SQL, no dashboards, and no context switching.

Short answer

Connect Cloudflare D1 to Sequel, then add Sequel's MCP server to Codex using the config on this page. Codex can then query your live Cloudflare D1 data in plain English, with no connector code and no CSV exports. Both steps take a few minutes.

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Example prompts

Everything you can ask Codex about your Cloudflare D1 data.

Ask in plain English — Sequel translates it into a Cloudflare D1 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

How many rows are in each table?
Show me the 20 most recently created users.
What is the conversion rate from signup to first purchase, by month?
Which customers signed up last quarter and are still active?
Find duplicate email addresses in the users table.

How it works

Three steps to get started

Connect Cloudflare D1 to Sequel

In your Sequel dashboard, go to Connections and add Cloudflare D1. 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 Cloudflare D1 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 Cloudflare D1 MCP to Codex

The Sequel CLI installs Cloudflare D1 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
```

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Frequently asked questions

How do I connect Cloudflare D1 to Codex?

You need two things: (1) connect Cloudflare D1 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 Cloudflare D1 data directly.

What Cloudflare D1 data can Codex access?

Codex can access any data available through your Cloudflare D1 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 Cloudflare D1 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 Cloudflare D1 and generate an API key. Sign up free at sequel.sh — no credit card required. Then create a connection to Cloudflare D1 and generate an API key from Settings → API Keys.

Can I connect multiple Cloudflare D1 accounts?

Yes. Sequel supports multiple connections of the same type. If you have multiple Cloudflare D1 accounts or properties, add each as a separate connection in Sequel. Codex will be able to query all of them.

Connect Cloudflare D1 to Codex today

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