Agentic Loop
Flow:
Claude → tool_use → execute tool → tool_result → Claude → next action → end_turn
When Should the Loop Stop?
- stop_reason = tool_use: Execute tool and continue.
- stop_reason = end_turn: Claude has finished the turn.
Do not: Parse phrases such as “task complete” or “I am done.”
A maximum-turn limit is useful as a safety guard, but it is not the primary completion signal.
Returning Tool Results
- Return the result in a user-role message.
- Use a tool_result block.
- Match the original tool_use_id.
- The result does not have to be JSON-only.
Multi-Turn Tool Calling
Each tool result can influence Claude’s next decision.
Example: Search → Read → Analyse → Call API → Final answer.
Memory: tool_use = continue. end_turn = finish.
