TokenEstimator

agent_sdk::context

Struct TokenEstimator 

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pub struct TokenEstimator;
Expand description

Estimates token count for messages.

Uses a simple heuristic of ~4 characters per token, which provides a reasonable approximation for most English text and code.

For more accurate counting, consider using a tokenizer library specific to your model (e.g., tiktoken for OpenAI models).

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impl TokenEstimator

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pub const fn estimate_text(text: &str) -> usize

Estimate tokens for a text string.

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pub fn estimate_message(message: &Message) -> usize

Estimate tokens for a single message.

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pub fn estimate_block(block: &ContentBlock) -> usize

Estimate tokens for a content block.

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pub fn estimate_history(messages: &[Message]) -> usize

Estimate total tokens for a message history.

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