const errorText = contextOverflowError.text;

const msgCount = attempt.messagesSnapshot?.length ?? 0;

const observedOverflowTokens = extractObservedOverflowTokenCount(errorText);

const overflowTokenCountForCompaction =

observedOverflowTokens ??

(ctxInfo.tokens > 0

? // Confirmed overflow with an unparseable provider message still carries a

// minimally over-budget count for compaction engines and diagnostics.

ctxInfo.tokens + 1

: undefined);

log.warn(

`[context-overflow-diag] sessionKey=${params.sessionKey ?? params.sessionId} ` +

`provider=${provider}/${modelId} source=${contextOverflowError.source} ` +

`messages=${msgCount} sessionFile=${activeSessionFile} ` +

`diagId=${overflowDiagId} compactionAttempts=${overflowCompactionAttempts} ` +

`observedTokens=${observedOverflowTokens ?? "unknown"} ` +

`compactionTokens=${overflowTokenCountForCompaction ?? "unknown"} ` +

`error=${errorText.slice(0, 200)}`,

);

const isCompactionFailure = isCompactionFailureError(errorText);

...(attempt.promptCache ? { promptCache: attempt.promptCache } : {}),

runId: params.runId,

trigger: "overflow",

...(observedOverflowTokens !== undefined

? { currentTokenCount: observedOverflowTokens }

...(overflowTokenCountForCompaction !== undefined

? { currentTokenCount: overflowTokenCountForCompaction }

: {}),

diagId: overflowDiagId,

attempt: overflowCompactionAttempts,

sessionKey: params.sessionKey,

sessionFile: activeSessionFile,

tokenBudget: ctxInfo.tokens,

...(observedOverflowTokens !== undefined

? { currentTokenCount: observedOverflowTokens }

...(overflowTokenCountForCompaction !== undefined

? { currentTokenCount: overflowTokenCountForCompaction }

: {}),

force: true,

compactionTarget: "budget",