Build applications that call the Claude API or Anthropic SDK. Use ONLY when the code actually uses or will use the `anthropic` SDK package or Claude API endpoints. TRIGGER when: - Code imports `anthropic` or `@anthropic-ai/sdk` (the Anthropic SDK) - Code imports `claude_agent_sdk` or `@anthropic-ai/claude-agent-sdk` (the Agent SDK) - User explicitly asks to use Claude, the Anthropic API, or Anthropic SDK - User needs an AI/LLM and no other provider's SDK is already in use DO NOT TRIGGER when (use another skill instead): - Code imports `openai`, `google.generativeai`, or any non-Anthropic AI SDK