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fix: allow multiple compaction retries on context overflow (#8928)

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Previously, overflowCompactionAttempted was a boolean flag set once, preventing
recovery when a single compaction wasn't enough. Change to a counter allowing up
to 3 attempts before giving up. Also add diagnostic logging on overflow events to
help debug early-overflow issues.

Fixes sessions that hit context overflow during long agentic turns with many tool
calls, where one compaction round isn't sufficient to bring context below limits.
This commit is contained in:
Glucksberg
2026-02-05 17:58:37 -04:00
committed by GitHub
parent 4629054403
commit 4e1a7cd60c
2 changed files with 73 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
src/agents/pi-embedded-runner/run.ts
View File

@@ -303,7 +303,8 @@ export async function runEmbeddedPiAgent(
}
}
let overflowCompactionAttempted = false;
const MAX_OVERFLOW_COMPACTION_ATTEMPTS = 3;
let overflowCompactionAttempts = 0;
try {
while (true) {
attemptedThinking.add(thinkLevel);
@@ -373,13 +374,23 @@ export async function runEmbeddedPiAgent(
if (promptError && !aborted) {
const errorText = describeUnknownError(promptError);
if (isContextOverflowError(errorText)) {
const msgCount = attempt.messagesSnapshot?.length ?? 0;
log.warn(
`[context-overflow-diag] sessionKey=${params.sessionKey ?? params.sessionId} ` +
`provider=${provider}/${modelId} messages=${msgCount} ` +
`sessionFile=${params.sessionFile} compactionAttempts=${overflowCompactionAttempts} ` +
`error=${errorText.slice(0, 200)}`,
);
const isCompactionFailure = isCompactionFailureError(errorText);
// Attempt auto-compaction on context overflow (not compaction_failure)
if (!isCompactionFailure && !overflowCompactionAttempted) {
if (
!isCompactionFailure &&
overflowCompactionAttempts < MAX_OVERFLOW_COMPACTION_ATTEMPTS
) {
overflowCompactionAttempts++;
log.warn(
`context overflow detected; attempting auto-compaction for ${provider}/${modelId}`,
`context overflow detected (attempt ${overflowCompactionAttempts}/${MAX_OVERFLOW_COMPACTION_ATTEMPTS}); attempting auto-compaction for ${provider}/${modelId}`,
);
overflowCompactionAttempted = true;
const compactResult = await compactEmbeddedPiSessionDirect({
sessionId: params.sessionId,
sessionKey: params.sessionKey,