earendil-works/pi · error · SessionError

already_exists

already_exists

Error message

Session already exists: ${id}

What it means

Error "Session already exists: ${id}" thrown in earendil-works/pi.

Source

Thrown at packages/agent/src/harness/session/memory.ts:153

			kind: "fact",
			seq: this.state.nextSequence,
			fact: "label",
			targetId: id,
			label,
		});
	}

	async getStats(): Promise<SessionStats> {
		return structuredClone(this.state.getStats());
	}
}

export class InMemorySessionRepo implements SessionRepo {
	private readonly sessions = new Map<string, InMemorySessionStorage>();

	async create(options: SessionCreateOptions = {}): Promise<Session> {
		const id = options.id ?? uuidv7();
		if (this.sessions.has(id)) throw new SessionError("already_exists", `Session already exists: ${id}`);
		const storage = new InMemorySessionStorage({
			id,
			createdAt: Date.now(),
			parentSessionId: options.parentSessionId,
		});
		this.sessions.set(id, storage);
		return new Session(storage);
	}

	async open(metadata: SessionMetadata): Promise<Session> {
		return new Session(this.requireStorage(metadata.id));
	}

	async list(): Promise<SessionMetadata[]> {
		return Promise.all([...this.sessions.values()].map((storage) => storage.getMetadata()));
	}

	async delete(metadata: SessionMetadata): Promise<void> {

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Use a unique session id, or load the existing session instead of creating it.

When it happens

Trigger: Thrown at packages/agent/src/harness/session/memory.ts:153 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/8285db1cf95516ac. Report an issue: GitHub.