majiayu000:fix-anthropic-empty-aimessage-streaming - Branch - langchain-ai/langchain

fix(anthropic): handle pre-completed content in message_start events

#34408

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majiayu000:fix-anthropic-empty-aimessage-streaming

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50dc89f

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d3e9c4d

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Untouched: 3

Skipped: 31

Benchmarks

Skipped (31)

Passed

test_init_time_with_client

libs/partners/anthropic/tests/unit_tests/test_standard.py

2.3 ms*2.3 ms

test_stream_time

libs/partners/anthropic/tests/integration_tests/test_standard.py::TestAnthropicStandard

34.8 ms*34.7 ms

test_init_time

libs/partners/anthropic/tests/unit_tests/test_standard.py::TestAnthropicStandard

795.6 µs*796.6 µs

Commits

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Base

master

d3e9c4d

+0.13%

fix(anthropic): handle pre-completed content blocks in message_start events When using programmatic tool calling (e.g., code_execution_20250825), Anthropic's API returns pre-completed tool_use blocks directly in the message_start event instead of streaming them incrementally. This caused empty AIMessage responses when using astream(). This fix modifies _make_message_chunk_from_anthropic_event() to check for and process pre-completed content blocks in message_start events, ensuring tool_use blocks are properly extracted into tool_call_chunks. Closes #34406

bd5fa46

3 days ago

by majiayu000

+0.05%

fix: resolve lint and type check errors in tests

91a15fd

3 days ago

by majiayu000

-0.13%

chore: update uv.lock

db9ee19

2 days ago

by majiayu000

-0.03%

Merge branch 'master' into fix-anthropic-empty-aimessage-streaming

bb59b1a

21 hours ago

by mdrxy

+0.13%

Merge branch 'master' into fix-anthropic-empty-aimessage-streaming

50dc89f

19 hours ago

by majiayu000

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