core, anthropic[patch]: support streaming tool calls when function has no arguments #23915
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resolves #23911
When an AIMessageChunk is instantiated, we attempt to parse tool calls off of the tool_call_chunks.
Here we add a special-case to this parsing, where
""will be parsed as{}.This is a reaction to how Anthropic streams tool calls in the case where a function has no arguments:
The
partial_jsondoes not accumulate to a valid json string-- most other providers tend to emit"{}"in this case.