fix(vertex): map anthropic-beta header to request body for prompt caching support #1139
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Including the 'caller' field in 'tool_use' blocks within input
messages causes API errors (especially for computer-use) because
the API expects only standard fields like id, name, type, and input.
This field was recently added to the SDK models and parameters but
should not be sent back to the API.
This PR:
1. Removes 'caller' from BetaToolUseBlockParam and
BetaServerToolUseBlockParam.
2. Adds __api_exclude__ = {"caller"} to BetaToolUseBlock and
BetaServerToolUseBlock models.
3. Modifies the internal transformer to explicitly strip 'caller'
if it's not annotated in a TypedDict, ensuring raw dicts or
unfiltered model dumps don't leak it back to the API.
Fixes anthropics#1112
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Google Cloud Vertex AI does not support the \�nthropic-beta\ HTTP header. This PR maps it to the \�nthropic_beta\ field in the request body, enabling features like Prompt Caching. Fixes #653