Codex + Cloudflare

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Codex + Cloudflare

OpenAI

Lightweight open-source terminal agent that reads and writes files, runs commands, and browses the web in a sandbox. Made by OpenAI.

TerminalStandaloneCloudExtensionOpen Source

Skills ↗ MCP Server ↗ Codex Docs ↗

Quick start

1. Install Codex

   Install the Codex CLI. macOS and Linux are fully supported; use WSL2 on Windows. For Homebrew or other install methods, see the Codex CLI setup guide ↗.

   npm install -g @openai/codex

2. Install Cloudflare Skills

   npx skills add https://github.com/cloudflare/skills

3. Add Cloudflare MCP servers

   For a full list of available Cloudflare MCP servers, refer to the repository on GitHub ↗.

   codex mcp add cloudflare --url https://mcp.cloudflare.com/mcp
   codex mcp add cloudflare-docs --url https://docs.mcp.cloudflare.com/mcp

4. Launch Codex

   Start Codex from the root of your project, where wrangler.jsonc lives (if it already exists).

   codex

5. Try a prompt

   For example:

   Create a Cloudflare Workers application that serves as a backend API server.

Cloudflare platform access

The ways Codex reaches Cloudflare. Expand any section to learn more.

Cloudflare Skills

Persistent platform context that teaches Codex how Cloudflare works.

Skills are instructions the agent loads on demand. The cloudflare/skills bundle ships eight Skills covering every layer of the platform — so the agent knows your conventions without you re-explaining them.

• cloudflare Comprehensive platform skill covering Workers, Pages, storage (KV, D1, R2), AI (Workers AI, Vectorize, Agents SDK), networking (Tunnel, Spectrum), security (WAF, DDoS), and IaC (Terraform, Pulumi).
• agents-sdk Building stateful AI agents with state, scheduling, RPC, MCP servers, email, and streaming chat.
• durable-objects Stateful coordination (chat rooms, games, booking), RPC, SQLite, alarms, WebSockets.
• sandbox-sdk Secure code execution for AI code execution, code interpreters, CI/CD systems, and interactive dev environments.
• wrangler Deploying and managing Workers, KV, R2, D1, Vectorize, Queues, Workflows.
• web-perf Auditing Core Web Vitals (FCP, LCP, TBT, CLS), render-blocking resources, network chains.
• building-mcp-server-on-cloudflare Building remote MCP servers with tools, OAuth, and deployment.
• building-ai-agent-on-cloudflare Building AI agents with state, WebSockets, and tool integration.

MCP servers

Live access to the Cloudflare API, docs, and observability from inside Codex.

MCP servers give Codex typed tools to call into Cloudflare at runtime. The cloudflare/mcp-server-cloudflare repo hosts all of them; the full catalog is also in the MCP servers for Cloudflare docs. The API server alone exposes 2,500+ endpoints in ~1,000 tokens via Code Mode.

• cloudflare-api Entire Cloudflare API (2,500+ endpoints) in ~1,000 tokens via Code Mode.
• cloudflare-docs Up-to-date Cloudflare documentation and reference.
• cloudflare-bindings Build Workers applications with storage, AI, and compute primitives.
• cloudflare-builds Manage and get insights into Workers builds.
• cloudflare-observability Debug and analyze application logs and analytics.
• cloudflare-radar Global Internet traffic insights, trends, URL scans, and utilities.
• cloudflare-containers Spin up a sandbox development environment.
• cloudflare-browser Fetch web pages, convert them to markdown, and take screenshots.
• cloudflare-logpush Quick summaries for Logpush job health.
• cloudflare-ai-gateway Search AI Gateway logs and inspect prompts, responses, and token usage.
• cloudflare-autorag List and search documents on your AutoRAGs.
• cloudflare-auditlogs Query audit logs and generate reports for review.
• cloudflare-dns-analytics Optimize DNS performance and debug issues based on current setup.
• cloudflare-dex Digital Experience Monitoring — insights on critical applications.
• cloudflare-casb Cloudflare One CASB — identify SaaS security misconfigurations.
• cloudflare-graphql Query analytics data through Cloudflare's GraphQL API.

Wrangler CLI

Sandbox-safe local dev and deploys.

Codex runs in a sandboxed environment — it can safely execute Wrangler commands without affecting your host system. The bundled wrangler Skill teaches Codex which commands to run for deploys, migrations, and log tailing.

What’s next

The unified cf CLI is in technical preview — a next-generation CLI that covers every Cloudflare product with consistent verbs and ergonomic output for agents. Try it with npx cf. Read the announcement →

Agent-friendly docs

Codex also browses the web — pair with the docs MCP server.

Codex supports web browsing natively. Combined with the docs MCP server, you get both fast indexed lookups and live browsing when needed. For offline or preloaded context:

• developers.cloudflare.com/llms.txt — directory of every Cloudflare product.

• developers.cloudflare.com/workers/llms.txt
• developers.cloudflare.com/agents/llms.txt
• developers.cloudflare.com/r2/llms.txt
• developers.cloudflare.com/d1/llms.txt

For a full overview of how these docs are structured for agents, refer to the AI tooling guide.

Example prompts

“Create a Cloudflare Workers application that serves as a backend API server.” “Add a D1 database to my Worker and create a users table with CRUD endpoints.” “Build an image upload service using R2 pre-signed URLs.” “Set up a KV namespace and use it for session storage in my Worker.” “Show me how to use Hyperdrive to connect my Worker to an existing Postgres database.” “Create an AI chat agent using the Cloudflare Agents SDK that maintains conversation history.” “Build a Workers AI chatbot with streaming responses.” “Build a WebSocket-based pub/sub app using Durable Objects with hibernation.” “Add a cron trigger to my Worker that runs every hour.” “Add rate limiting and bot protection to my API endpoints.” “Set up GitHub Actions to auto-deploy this Worker to Cloudflare.” “Create separate staging and production environments for my Worker.” “Generate Vitest tests for my Worker.” “Check my deployment logs for errors and suggest fixes.” “Deploy this project to Cloudflare Workers with a custom domain.”

Tips

• The Cloudflare API MCP server uses Code Mode — Codex writes JavaScript against a typed API to reach any of 2,500+ endpoints in ~1,000 tokens.
• Try the /cloudflare:build-agent slash command to scaffold a complete Agents SDK project, or /cloudflare:build-mcp for a remote MCP server.
• For more information on installing additional MCP servers, or when to use Code Mode versus traditional MCP servers, refer to the Cloudflare MCP server repository ↗.

FAQ

Should I use Skills, the MCP server, Wrangler CLI, or all of them?

All three. Skills load Cloudflare knowledge into every Codex session (when to use Durable Objects, how to structure a Workers project, etc.). The Cloudflare API MCP server handles platform operations (DNS, WAF, Zero Trust). Wrangler handles local dev, deploys, and migrations. The bundled wrangler Skill teaches Codex when to run CLI commands vs. call the MCP API.

How do I connect Codex to my Cloudflare account?

The first time Codex calls a Cloudflare tool, you will be redirected to authorize via OAuth and choose permissions.

Is Codex open source?

Yes. Codex is open source and available on GitHub at github.com/openai/codex.

Troubleshooting

MCP server not connecting

Verify the server was added with codex mcp add cloudflare --url https://mcp.cloudflare.com/mcp. Run codex mcp list to confirm it appears, then use /mcp inside the Codex TUI to check its status.

Getting outdated information about Cloudflare products

Enable the Cloudflare docs MCP server so the agent can fetch current documentation at runtime. If you prefer not to use the MCP server, point the agent directly at developers.cloudflare.com/llms.txt for a directory of every product, or developers.cloudflare.com/<product>/llms.txt for a product-specific index.

MCP server authentication fails

Remove and re-add the MCP server. Complete the OAuth flow in your browser when prompted.

Build agents on Cloudflare

Also worth knowing

Cloudflare is not just a deploy target for agents, it is a full stack for building your own.

Agents SDK

Stateful AI agents with state, scheduling, RPC, email, streaming chat — and the Code Mode SDK for token-efficient tool use.

Learn more →

Build an MCP server

Ship a remote MCP server on Workers with OAuth, durable state, and streamable HTTP transport.

Learn more →

Workers AI

Run open-source LLMs, embedding models, and image models at the edge. Use it as your agent's model provider.

Learn more →

Worker Loader

Load user-generated code into isolated Workers on demand. The secure sandbox behind Code Mode.

Learn more →

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