Extract structured output from tool calls in response.

Used for :object operations to get the final structured output.

@spec extract_stub_tools_from_messages(map()) :: [map()]

Extract stub tool definitions from messages when tools are needed but none provided.

Bedrock and Azure are strict about tool validation in multi-turn conversations. If the conversation history contains tool_use or tool_result blocks, the API requires corresponding tool definitions. This function extracts tool names from the messages and creates minimal stub definitions.

Conditionally add a parameter to a map if the value is not nil.

Add extended thinking configuration to request body if enabled.

Extended thinking doesn't work when tool_choice forces a specific tool. See: https://docs.claude.com/en/docs/build-with-claude/extended-thinking

Prepare context and options for :object operations using structured output.

Creates a synthetic "structured_output" tool and forces tool choice to use it. This leverages Claude's tool-calling for structured JSON output.