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refs(#2264): Phase 3 — emit PrefixCacheChange events from FrozenPrefix layer #2576

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refs(#2264): Phase 3 — emit PrefixCacheChange events from FrozenPrefix layer #2576

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a8cfbbf
refs(#2264): Phase 3 — emit PrefixCacheChange events from FrozenPrefi…
encyc Jun 2, 2026
21721a4
fix: don't double-count drift — only emit PrefixCacheChange on first …
encyc Jun 2, 2026
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18 changes: 16 additions & 2 deletions crates/tui/src/core/engine/turn_loop.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -314,7 +314,9 @@ impl Engine {
// Three-zone prefix contract (#2264): freeze baseline on first
// turn, verify against it on subsequent turns. Operates alongside
// PrefixStabilityManager as an independent diagnostic layer.
// Phase 2: warn-only, auto-re-freeze on drift.
// Phase 3: emit a one-shot 'frozen' event on first turn.
// Drift is logged (tracing::debug!) but not re-emitted —
// PrefixStabilityManager already reports the change above.
let system_text =
crate::prefix_cache::system_prompt_text(self.session.system_prompt.as_ref());
let current_tools: &[crate::models::Tool] = active_tools.as_deref().unwrap_or_default();
Expand All @@ -338,7 +340,19 @@ impl Engine {
self.session.system_prompt.as_ref(),
current_tools.to_vec(),
);
self.session.frozen_prefix = Some(pinned.freeze());
let frozen = pinned.freeze();
let _ = self
.tx_event
.send(Event::PrefixCacheChange {
description: format!("frozen: {}", frozen.short_id()),
system_prompt_changed: false,
tools_changed: false,
stability_pct: 100,
changed: false,
pinned_combined_hash: frozen.hash().to_string(),
})
.await;
self.session.frozen_prefix = Some(frozen);
}
}

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