earendil-works/pi · error · Error

Turn prefix summarization failed: ${response.errorMessage ||

Error message

Turn prefix summarization failed: ${response.errorMessage || "Unknown error"}

What it means

Error "Turn prefix summarization failed: ${response.errorMessage || "Unknown error"}" thrown in earendil-works/pi.

Source

Thrown at packages/coding-agent/src/core/compaction/compaction.ts:987

	const maxTokens = Math.min(
		Math.floor(0.5 * reserveTokens),
		model.maxTokens > 0 ? model.maxTokens : Number.POSITIVE_INFINITY,
	); // Smaller budget for turn prefix
	const llmMessages = convertToLlm(messages);
	const conversationText = serializeConversation(llmMessages);
	const promptText = `<conversation>\n${conversationText}\n</conversation>\n\n${TURN_PREFIX_SUMMARIZATION_PROMPT}`;

	const response = await completeSummarization(
		model,
		buildSummarizationContext(promptText),
		createSummarizationOptions(model, maxTokens, apiKey, headers, env, signal, thinkingLevel, sessionId),
		streamFn,
		retry,
		callbacks,
	);

	if (response.stopReason === "error") {
		throw new Error(`Turn prefix summarization failed: ${response.errorMessage || "Unknown error"}`);
	}
	if (response.content.some((block) => block.type === "toolCall")) {
		throw new Error("Turn prefix summarization attempted to call a tool");
	}

	return {
		text: contentText(response.content),
		usage: response.usage,
	};
}

View on GitHub (pinned to 4af9d21d3b)

When it happens

Trigger: Thrown at packages/coding-agent/src/core/compaction/compaction.ts:987 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of earendil-works/pi@4af9d21d3b (2026-08-24). Data as JSON: /api/errors/63671822475aec80. Report an issue: GitHub.