Development

This skill provides comprehensive knowledge for building applications with Cloudflare Sandboxes SDK, which enables secure, isolated code execution in full Linux containers at the edge. It should be used when executing untrusted code, running Python/Node.js scripts, performing git operations, building AI code execution systems, creating interactive development environments, or implementing CI/CD workflows that require full OS capabilities. Use when: Setting up Cloudflare Sandboxes, executing ...

Cloudflare R2 object storage - upload, download, list, delete files, presigned URLs. Trigger: When working with R2 storage, file uploads, object storage, presigned URLs.

Build async message queues with Cloudflare Queues for background processing. Use when: handling async tasks, batch processing, implementing retries, configuring dead letter queues, managing consumer concurrency, or troubleshooting queue timeout, batch retry, message loss, or throughput exceeded. Prevents 13 documented errors including multi-dev limitations, remote binding conflicts, and DLQ issues.

Build Python APIs on Cloudflare Workers using pywrangler CLI and WorkerEntrypoint class pattern. Includes Python Workflows for multi-step DAG automation. Prevents 11 documented errors. Use when: building Python serverless APIs, migrating Python to edge, or troubleshooting async errors, package compatibility, handler pattern mistakes, RPC communication issues.

Cloudflare Pages - Full-stack JAMstack platform with global CDN, serverless functions, Git integration, and native bindings to Workers, KV, R2, D1, and Durable Objects

Deploy Next.js to Cloudflare Workers via OpenNext adapter. Use for SSR, ISR, App/Pages Router, or encountering worker size limits, runtime compatibility, connection scoping errors.

Deploy Next.js applications (App Router and Pages Router) to Cloudflare Workers using the OpenNext adapter. This skill should be used when deploying Next.js apps with SSR, ISR, or server components to Cloudflare's serverless platform. It covers setup for both new and existing projects, configuration requirements, development workflows, integration with Cloudflare services (D1, R2, KV, Workers AI), and prevention of 10+ documented errors including worker size limits, runtime compatibility, dat...

Store key-value data globally with Cloudflare KV's edge network. Use when: caching API responses, storing configuration, managing user preferences, handling TTL expiration, or troubleshooting KV_ERROR, 429 rate limits, eventual consistency, cacheTtl errors, wrangler types issues, or remote binding configuration.

Store and transform images with Cloudflare Images API and transformations. Use when: uploading images, implementing direct creator uploads, creating variants, generating signed URLs, optimizing formats (WebP/AVIF), transforming via Workers, or debugging CORS, multipart, AVIF limits, metadata stripping, cache issues, or error codes 9401-9413.

Production-ready starter project for React + Cloudflare Workers + Hono with core services (D1, KV, R2, Workers AI) and optional advanced features (Clerk Auth, AI Chat, Queues, Vectorize). Complete with planning docs, session handoff protocol, and enable scripts for opt-in features. Use when: starting new full-stack project, creating Cloudflare app, scaffolding web app, AI-powered application, chat interface, RAG application, need complete starter, avoid setup time, production-ready template,...

Production-tested integration patterns for connecting React frontends to Cloudflare Worker backends with Hono, Clerk authentication, and D1 databases. Prevents common frontend-backend connection issues, CORS errors, auth token failures, and race conditions. Use when: connecting frontend to backend, implementing auth flow, setting up API calls, troubleshooting CORS, fixing race conditions, auth tokens not passing, frontend-backend connection errors, 401 errors, integrating Clerk with Workers,...

Expert-level Cloudflare Workers, CDN, edge computing, and security services

Cloudflare Email Routing for receiving/sending emails via Workers. Use for email workers, forwarding, allowlists, or encountering Email Trigger errors, worker call failures, SPF issues.

Complete guide for Cloudflare Email Routing covering both Email Workers (receiving emails) and Send Email bindings (sending emails from Workers). Use when: setting up email routing, creating email workers, processing incoming emails, sending emails from Workers, implementing email allowlists/blocklists, forwarding emails with custom logic, replying to emails automatically, parsing email content, configuring MX records for email, troubleshooting email delivery issues, or encountering email wo...

Build stateful Durable Objects for real-time apps, WebSocket servers, coordination, and persistent state. Prevents 20 documented errors. Use when: implementing chat rooms, multiplayer games, rate limiting, session management, WebSocket hibernation, or troubleshooting class export, migration, WebSocket state loss, boolean binding, RPC streams, or binding errors.

Deploy and manage Cloudflare Workers, Pages, KV, R2, and D1 using wrangler CLI or MCP server. Use when working with Cloudflare services, serverless functions, or edge deployments.

Deploy and manage Cloudflare Workers, Pages, KV, R2, and D1 using wrangler CLI or MCP server. Use when working with Cloudflare services, serverless functions, or edge deployments.

Cloudflare Cron Triggers for scheduled Workers execution. Use for periodic tasks, scheduled jobs, or encountering handler not found, invalid cron expression, timezone errors.

Complete knowledge domain for Cloudflare Cron Triggers - scheduled execution of Workers using cron expressions for periodic tasks, maintenance jobs, and automated workflows. Use when: scheduling Workers to run periodically, adding cron triggers to Workers, configuring scheduled tasks, testing cron handlers, combining crons with Workflows, enabling Green Compute, handling multiple schedules, or encountering "scheduled handler not found", "cron expression invalid", "changes not propagating", "...

Deploy and manage Docker containers on Cloudflare's global network alongside Workers. Use when building applications that need to run Python code, process large files (multi-GB zips, video transcoding), execute CLI tools, run AI inference, create code sandboxes, or any workload requiring more memory/CPU than Workers provide. Triggers include requests to run containers, execute arbitrary code, process large files, deploy backend services in Python/Go/Rust, or integrate heavyweight compute with...

Activates automatically when designing or implementing Cloudflare Workers APIs, orchestrating multi-provider API calls, implementing D1 database operations, or managing KV-based caching strategies. Ensures proper error handling, provider tagging, fallback chains, and orchestration patterns for BooksTrack backend infrastructure. Auto-activates on: - File patterns: *.worker.js, *-api.ts, *-service.ts in backend code - Keywords: "api orchestration", "multi-provider", "fallback chain", "D1 quer...

Build AI agents with Cloudflare Agents SDK on Workers + Durable Objects. Provides WebSockets, state persistence, scheduling, and multi-agent coordination. Prevents 23 documented errors. Use when: building WebSocket agents, RAG with Vectorize, MCP servers, or troubleshooting "Agent class must extend", "new_sqlite_classes", binding errors, WebSocket payload limits.

CloudBase platform knowledge and best practices. Use this skill for general CloudBase platform understanding, including storage, hosting, authentication, cloud functions, database permissions, and data models.

Flow Nexus user management and system utilities. Use for profile management, storage operations, real-time subscriptions, and platform administration.