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feat: auto-compact and retry on context window errors

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Adds automatic compaction and retry when context window is exceeded.
This commit is contained in:
TheArchitectit
2026-05-24 21:24:44 -05:00
committed by GitHub
parent f1a55a211e
commit b43a6f2d29
4 changed files with 917 additions and 5 deletions
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13
rust/crates/runtime/src/compact.rs
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@@ -108,10 +108,15 @@ pub fn compact_session(session: &Session, config: CompactionConfig) -> Compactio
.first()
.and_then(extract_existing_compacted_summary);
let compacted_prefix_len = usize::from(existing_summary.is_some());
let raw_keep_from = session
.messages
.len()
.saturating_sub(config.preserve_recent_messages);
// When preserve_recent_messages is 0, the caller wants maximum compaction
// (no recent messages preserved). Without this guard, saturating_sub(0)
// returns messages.len(), which later indexes past the end of the array
// at session.messages[k] because keep_from == messages.len() is out of bounds.
let raw_keep_from = if config.preserve_recent_messages == 0 {
session.messages.len()
} else {
session.messages.len().saturating_sub(config.preserve_recent_messages)
};
// Ensure we do not split a tool-use / tool-result pair at the compaction
// boundary. If the first preserved message is a user message whose first
// block is a ToolResult, the assistant message with the matching ToolUse