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HeuristicTokenCounter

phi_core::context::token

Struct HeuristicTokenCounter 

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pub struct HeuristicTokenCounter;
Expand description

Default token counter: ~4 chars per token (heuristic for English text).

Good enough for context budgeting and compaction threshold decisions. Use a model-specific tokenizer (e.g., tiktoken) for precision.

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impl TokenCounter for HeuristicTokenCounter

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fn estimate_text(&self, text: &str) -> usize

Estimate tokens for a raw text string.
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fn estimate_content(&self, content: &[Content]) -> usize

Estimate tokens for a slice of Content blocks.
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fn estimate_message(&self, msg: &AgentMessage) -> usize

Estimate tokens for a single message.
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fn estimate_messages(&self, msgs: &[AgentMessage]) -> usize

Estimate total tokens for a message list.

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