ai-agents-surface-selection-the-user-is-building-an-application-with-claude-an-5304721e

THEN Use the decision tree: (1) If deploying on third-party (Bedrock/Vertex/Founded), Managed site_1 is unavailable — use Claude API + tool use. (2) For single LLM calls (classification, summarization, extraction, Q&A), use Claude API. (3) For multi-step pipelines with code-controlled logic, use Claude API + tool use. (4) For open-ended site_2 with your own tools and compute, use Claude API agentic loop. (5) Only use Managed site_3 when Anthropic should run the loop and host the tool-execution sandbox (e.g., stateful coding agent, long-running research agent, persisted agent configs). Check complexity, value, viability, and cost of error before choosing the agent tier.