fix(streaming): handle dict objects that lack to_dict() in stream accumulator#1272
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tao-to-python wants to merge 1 commit intoanthropics:mainfrom
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fix(streaming): handle dict objects that lack to_dict() in stream accumulator#1272tao-to-python wants to merge 1 commit intoanthropics:mainfrom
tao-to-python wants to merge 1 commit intoanthropics:mainfrom
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…umulator When using beta streaming with certain betas (e.g. effort, code-execution), the accumulator intermittently receives raw dicts instead of Pydantic models for message_start and content_block_start events. Calling .to_dict() on a dict raises AttributeError. Add hasattr checks to fall back to dict() when to_dict is not available, in both beta and non-beta streaming paths. Fixes anthropics#1088
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Description
Fixes intermittent
AttributeError: 'dict' object has no attribute 'to_dict'during beta streaming, as reported in #1088.Problem
When using
client.beta.messages.stream()with certain betas (e.g.effort-2025-11-24,code-execution-2025-08-25), the stream accumulator intermittently receives rawdictobjects instead of Pydantic models formessage_startandcontent_block_startevents.Calling
.to_dict()on a plain dict raisesAttributeError.Solution
Add
hasattrchecks before calling.to_dict(), falling back todict()conversion:Applied to both
_messages.py(non-beta) and_beta_messages.py(beta) for consistency.Changes
src/anthropic/lib/streaming/_beta_messages.pyto_dict()calls on message + content_blocksrc/anthropic/lib/streaming/_messages.pyto_dict()call on messageFixes #1088