Unverified50% confidenceFactExact time
Anthropic's billing documentation states that what counts toward tokens includes not only user input but also tool definitions, tool use blocks, and tool result blocks, and additionally appends built-in tool use prompts.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/12/2026
First Seen
Valid until: 1/10/2027
Sources
Related Entities
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