earendil-works/pi · error · Error

Nothing to compact (session too small)

Error message

Nothing to compact (session too small)

What it means

Error "Nothing to compact (session too small)" thrown in earendil-works/pi.

Source

Thrown at packages/coding-agent/src/core/agent-session.ts:1887

		try {
			if (!this.model) {
				throw new Error(formatNoModelSelectedMessage());
			}

			const { model: requestModel, apiKey, headers, env } = await this._getSummarizationRequestAuth(this.model);

			const pathEntries = this.sessionManager.getBranch();
			const settings = this.settingsManager.getCompactionSettings();

			const preparation = prepareCompaction(pathEntries, settings);
			if (!preparation) {
				// Check why we can't compact
				const lastEntry = pathEntries[pathEntries.length - 1];
				if (lastEntry?.type === "compaction") {
					throw new Error("Already compacted");
				}
				throw new Error("Nothing to compact (session too small)");
			}

			let extensionCompaction: CompactionResult | undefined;

			if (this._extensionRunner.hasHandlers("session_before_compact")) {
				const result = (await this._extensionRunner.emit({
					type: "session_before_compact",
					preparation,
					branchEntries: pathEntries,
					customInstructions,
					reason: "manual",
					willRetry: false,
					signal: this._compactionAbortController.signal,
				})) as SessionBeforeCompactResult | undefined;

				if (result?.cancel) {
					throw new Error("Compaction cancelled");
				}

View on GitHub (pinned to 4af9d21d3b)

When it happens

Trigger: Thrown at packages/coding-agent/src/core/agent-session.ts:1887 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/af8658fc8ccb8838. Report an issue: GitHub.