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Apply tool_result_cache_type only to the last tool result message across all messages instead of applying it to each tool result during creation. This prevents cache accumulation when there are multiple tool call rounds.
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Description
Refactor of #485.
Problem
When using
tool_result_cache_typein multi-step tool calling scenarios, cache_control was being applied to every ToolResultMessage instead of just the last one. This could exceed Anthropic's 4 cache breakpoint limit and is unnecessary since the system uses "longest matching prefix" caching.Solution
Move cache control application from
Text.php(per-message duringhandleToolCalls()) toMessageMap::map()where it applies cache_control only to the last ToolResultMessage across all messages.Changes