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perf: remove unnecessary typing.cast calls in add_messages

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The cast(BaseMessageChunk, m) calls in add_messages were no-ops at
runtime but accounted for ~92K function calls per react_agent_100x
benchmark run (~3ms overhead). Remove them since message_chunk_to_message
already handles the type internally.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
John Kennedy
2026-03-12 00:02:30 +00:00
co-authored by Claude Opus 4.6
parent 45d111876c
commit 49beffcc49
1 changed files with 2 additions and 8 deletions
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libs/langgraph/langgraph/graph/message.py
+2 -8
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@@ -191,14 +191,8 @@ def add_messages(
if not isinstance(right, list):
right = [right] # type: ignore[assignment]
# coerce to message
left = [
message_chunk_to_message(cast(BaseMessageChunk, m))
for m in convert_to_messages(left)
]
right = [
message_chunk_to_message(cast(BaseMessageChunk, m))
for m in convert_to_messages(right)
]
left = [message_chunk_to_message(m) for m in convert_to_messages(left)]
right = [message_chunk_to_message(m) for m in convert_to_messages(right)]
# assign missing ids
for m in left:
if m.id is None: