Unverified50% confidenceFactExact time
Messages events are subdivided into four types: Reasoning, Text, Tool Calls, and Output.
1
Sources
50%
Confidence
Long-term
Relevance
10/25/2026
First Seen
Sources
LangChain Agent Event Streaming Explained: A Practical Guide
bilibili老鱼干Pro10/24/2026
Related Entities
Related Claims
UnverifiedThe usage field in the Messages API has always been used to return the token statistics of the current call (such as input_tokens, output_tokens).66% similarUnverifiedThe total token count for a single conversation is the sum of input (context, instructions, history) and output (the model's generated response)65% similarUnverifiedThe developer defined "recovery-type" sessions as 10 in total with 1,636 messages combined, and "publishing-type" sessions as 3 in total with 536 messages combined; the 1,327-message session was thrown into "uncategorized" because it could not be assigned to either of these two categories.63% similarUnverifiedWriting the role and output format into the system message and injecting the email body to be processed into the user message via an expression is a layered approach that better aligns with the model's design intent and is easier to reuse.62% similar
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