The Tool Use Loop: input_schema, tool_use, and tool_result

What you will be able to do

• ✓Identify the three pieces of a tool definition (name, description, input_schema) and what input_schema declares
• ✓Trace the full tool-use round trip: tool_use block out, tool_result block back, matched by id
• ✓Distinguish the four tool_choice modes (auto, any, tool, none) and when each applies
• ✓Explain parallel tool use and how multiple results are returned in one user turn