use crate::retro::types::{Bet, Inputs};
const TRUNCATION_RATE_THRESHOLD: f64 = 0.10;
pub fn run(inputs: &Inputs) -> Vec<Bet> {
let (truncated, total) = count_stop_reasons(inputs);
if total == 0 {
return vec![];
}
let rate = truncated as f64 / total as f64;
if rate < TRUNCATION_RATE_THRESHOLD {
return vec![];
}
vec![Bet {
id: format!("H22:truncation:{truncated}:{total}"),
heuristic_id: "H22".into(),
title: format!(
"Output truncated in {:.0}% of turns ({truncated}/{total})",
rate * 100.0
),
hypothesis: format!(
"{truncated} of {total} turns hit max_tokens. Tasks are too large for one turn."
),
expected_tokens_saved_per_week: truncated as f64 * 800.0,
effort_minutes: 30,
evidence: vec![format!(
"{truncated}/{total} turns with stop_reason=max_tokens"
)],
apply_step: "Increase output budget (max_tokens) or decompose tasks into smaller turns."
.into(),
evidence_recency_ms: inputs.window_end_ms,
confidence: None,
category: None,
}]
}
fn count_stop_reasons(inputs: &Inputs) -> (usize, usize) {
let mut truncated = 0usize;
let mut total = 0usize;
for (_, event) in &inputs.events {
let Some(ref sr) = event.stop_reason else {
continue;
};
total += 1;
if sr == "max_tokens" {
truncated += 1;
}
}
(truncated, total)
}