earendil-works/pi · error · Error

Transformed eval system prompt must not be empty.

Error message

Transformed eval system prompt must not be empty.

What it means

Error "Transformed eval system prompt must not be empty." thrown in earendil-works/pi.

Source

Thrown at packages/evals/src/pi-harness.ts:156

				: {}),
		});
		signal?.throwIfAborted();
		sessionManager = SessionManager.create(cwd, join(root, "sessions"));
		setArtifact("runId", sessionManager.getSessionId());
		session = (
			await createAgentSessionFromServices({
				services,
				sessionManager,
				model,
				thinkingLevel: "off",
				noTools: options.noTools,
			})
		).session;

		const evalSession = session;
		if (options.transformSystemPrompt) {
			transformedSystemPrompt = options.transformSystemPrompt(evalSession.systemPrompt);
			if (!transformedSystemPrompt.trim()) throw new Error("Transformed eval system prompt must not be empty.");
			await evalSession.reload();
		}
		let abortPromise: Promise<void> | undefined;
		const abort = () => {
			abortPromise ??= evalSession.abort();
		};
		signal?.addEventListener("abort", abort, { once: true });
		try {
			signal?.throwIfAborted();
			if (evalSession.extensionRunner.getExtensionPaths().length !== 0) {
				throw new Error("Expected an isolated eval session to start without extensions.");
			}
			const steps = typeof input === "string" ? [{ type: "prompt" as const, content: input }] : input;
			let response: string | undefined;
			for (const step of steps) {
				if (step.type === "prompt") {
					response = await promptAgent(evalSession, step.content, signal);
				} else {

View on GitHub (pinned to 4af9d21d3b)

When it happens

Trigger: Thrown at packages/evals/src/pi-harness.ts:156 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/1cede36fcc4bbf37. Report an issue: GitHub.