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docs[patch]: update trim_messages doc (#30462)

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Vadym Barda
2025-03-24 14:50:48 -04:00
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parent c2dd8d84ff
commit 97dec30eea
2 changed files with 65 additions and 38 deletions
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6
libs/core/langchain_core/messages/utils.py
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@@ -681,6 +681,12 @@ def trim_messages(
BaseMessage. If a BaseLanguageModel is passed in then
BaseLanguageModel.get_num_tokens_from_messages() will be used.
Set to `len` to count the number of **messages** in the chat history.
Note:
Use `count_tokens_approximately` to get fast, approximate token counts.
This is recommended for using `trim_messages` on the hot path, where
exact token counting is not necessary.
strategy: Strategy for trimming.
- "first": Keep the first <= n_count tokens of the messages.
- "last": Keep the last <= n_count tokens of the messages.