earendil-works/pi · error · TypeError

${label} must be a non-empty string

Error message

${label} must be a non-empty string

What it means

Error "${label} must be a non-empty string" thrown in earendil-works/pi.

Source

Thrown at packages/server/src/protocol.ts:131

	id: string;
}

export interface ToolTranscriptOptions {
	id: string;
	call: ToolCall;
}

function nonNegativeInteger(value: number | undefined): number | undefined {
	if (value === undefined || !Number.isFinite(value)) return undefined;
	return Math.max(0, Math.floor(value));
}

function nonNegativeNumber(value: number): number {
	return Number.isFinite(value) ? Math.max(0, value) : 0;
}

function identifier(value: string, label: string): string {
	if (typeof value !== "string" || value.length === 0) throw new TypeError(`${label} must be a non-empty string`);
	return value;
}

function timestamp(value: number): number {
	if (!Number.isSafeInteger(value) || value < 0)
		throw new TypeError("Protocol timestamps must be non-negative integers");
	return value;
}

/** Validate and copy a value from an execution boundary into the protocol's JSON-compatible subset. */
export function toProtocolJsonValue(value: unknown, seen = new Set<object>()): JsonValue {
	if (value === null || typeof value === "string" || typeof value === "boolean") return value;
	if (typeof value === "number") {
		if (!Number.isFinite(value)) throw new TypeError("Protocol JSON numbers must be finite");
		return value;
	}
	if (typeof value !== "object") throw new TypeError(`Unsupported protocol JSON value: ${typeof value}`);
	if (seen.has(value)) throw new TypeError("Protocol JSON values must not contain circular references");

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Provide a non-empty string for this field.

When it happens

Trigger: Thrown at packages/server/src/protocol.ts:131 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/d97b35fd7f7b2c45. Report an issue: GitHub.