fix(anthropic): skip cache_control for code_execution tool blocks #34543
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Fixes langchain-ai#34542 When using AnthropicPromptCachingMiddleware with Claude's code_execution feature, the middleware was incorrectly applying cache_control to tool_use and tool_result blocks that were called by code_execution. The Anthropic API rejects these requests because these blocks cannot have cache_control as they are not rendered in Claude's context. This fix: - Collects tool_use_ids of blocks called by code_execution (identified by the 'caller' field) - Skips applying cache_control to tool_use blocks with a code_execution caller - Skips applying cache_control to tool_result blocks whose tool_use_id corresponds to a code_execution tool - Applies cache_control only to the next eligible block in the conversation
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Fixes #34542
When using AnthropicPromptCachingMiddleware with Claude's code_execution feature, the middleware was incorrectly applying cache_control to tool_use and tool_result blocks that were called by code_execution. The Anthropic API rejects these requests because these blocks cannot have cache_control as they are not rendered in Claude's context.
This fix: