How to Connect Cloudflare D1 to Claude Code
Query your Cloudflare D1 data directly from Claude Code 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 Claude Code using the config on this page. Claude Code 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.
Everything you can ask Claude Code about your Cloudflare D1 data.
Ask in plain English — Sequel translates it into a Cloudflare D1 query, runs it, and Claude Code hands back the answer. No SQL, no dashboards, no CSV exports.
- 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 Sequel to the agent
Copy the Sequel MCP configuration into Claude Code's settings file (shown below). Swap in your API key from Settings → API Keys.
Ask Claude Code about your data
Restart Claude Code and start asking questions. "How many rows are in each table?" — and get a real answer backed by live Cloudflare D1 data.
Why Claude Code
What Claude Code does with your Cloudflare D1 data
Database access from the terminal
Claude Code can now query your databases as part of agentic coding sessions. Ask it to check schemas, pull sample data, or verify data assumptions — all without leaving the terminal.
Data-aware code generation
When Claude Code knows your actual schema through Sequel, it generates more accurate SQL, migrations, and ORM models — grounded in what's really in your database, not guesses.
Works in any Claude Code session
Once added via CLI, Sequel tools are available in every Claude Code session — interactive, one-shot, or automated. No per-project setup needed.
Configuration
Add Sequel to Claude Code
Place this in claude mcp add (CLI) and replace sql_your_api_key with a key from Settings → API Keys.
claude mcp add (CLI)
claude mcp add --transport http sequel https://api.sequel.sh/mcp \
--header "Authorization: Bearer sql_your_api_key"Install
Install Cloudflare D1 MCP in Claude Code
Pick your app and Sequel installs itself: a one-click link where the client supports it, that client’s own few steps where it doesn’t. Every route signs in with your Sequel account over OAuth, so there is no API key to copy and nothing to keep in sync.
Already have an MCP client?
https://api.sequel.sh/mcp
Add it as a remote (streamable HTTP) server and sign in when prompted. Skills come with it; nothing else to install. Manual setup per client
Add Sequel to Claude Code
Terminal
claude mcp add --transport http sequel https://api.sequel.sh/mcp
- 1Run the command in your terminal. It adds Sequel to the current project; add --scope user for every project.
- 2Start Claude Code and run /mcp. Choose sequel and sign in in the browser.
- 3Ask a question. Claude Code asks your permission the first time it calls a tool.
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Add Sequel once in ChatGPT and your dot can answer data questions on its own, day and night.
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Query your PostgreSQL database in plain English. No SQL required.
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Frequently asked questions
How do I connect Cloudflare D1 to Claude Code?
You need two things: (1) connect Cloudflare D1 to Sequel in your Sequel dashboard under Connections, and (2) add the Sequel MCP config to Claude Code using the setup shown above. Once both are done, Claude Code can query your Cloudflare D1 data directly.
What Cloudflare D1 data can Claude Code access?
Claude Code 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 Claude Code's servers?
Query results are returned to Claude Code 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. Claude Code will be able to query all of them.
How do I add Sequel to Claude Code?
Run the `claude mcp add` command shown above in your terminal. Replace `sql_your_api_key` with a key from Settings → API Keys. The server is added at the default `local` scope (current project only).
How do I make Sequel available across every project?
Add the `--scope user` flag: `claude mcp add --scope user --transport http sequel https://api.sequel.sh/mcp --header "Authorization: Bearer sql_your_api_key"`. User-scope servers are available in every Claude Code session on this machine.
Can I verify Sequel is connected?
Run `claude mcp list` to see all configured MCP servers, or `claude mcp get sequel` to inspect the Sequel config specifically.
Does this work in Claude Code's non-interactive mode?
Yes. Sequel tools are available in both interactive (`claude`) and non-interactive (`claude -p 'your prompt'`) modes. They're also available when using Claude Code via the SDK.
How does Sequel connect to Cloudflare D1?
Through Cloudflare's D1 REST API. You sign in with Cloudflare, approve the connection, and choose which D1 database to connect. Sequel stores the resulting tokens encrypted and refreshes them automatically, so there is no API token to create, paste, or rotate by hand.
Can one connection reach more than one database?
No. You pick exactly one D1 database when you connect, and that choice is baked into the connection. Sequel has no tool that can list or query any other database. If you want to query a second database, add a second connection.
Is it read-only?
Yes, and it is enforced by Cloudflare rather than by us. Sequel requests only the D1 Read scope, so Cloudflare itself rejects any write that reaches the D1 API. The tools Sequel exposes are query and schema introspection, and nothing in the connector can create, update, or delete data.
Do I need to move my data anywhere?
No. Sequel queries D1 directly over Cloudflare's API. Nothing is copied into a warehouse and there is no sync to schedule. Query results are stored so you can export them, but your tables stay where they are.
Connect Cloudflare D1 to Claude Code today
Sign up free, connect your data sources, and start querying in minutes.