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7cc725496e
The proxy_ prefix logic correctly skips built-in tools (those with a non-empty "type" field) in tools[] definitions but does not skip them in messages[].content[] tool_use blocks or tool_choice. This causes web_search in conversation history to become proxy_web_search, which Anthropic does not recognize. Fix: collect built-in tool names from tools[] into a set and also maintain a hardcoded fallback set (web_search, code_execution, text_editor, computer) for cases where the built-in tool appears in history but not in the current request's tools[] array. Skip prefixing in messages and tool_choice when name matches a built-in.