earendil-works/pi · error · SessionError

storage

storage

Error message

Lane ${newRecord.lane} already has an open operation ${currentOpenOperationId}

What it means

Error "Lane ${newRecord.lane} already has an open operation ${currentOpenOperationId}" thrown in earendil-works/pi.

Source

Thrown at packages/agent/src/harness/session/jsonl/storage.ts:177

				...structuredClone(newEntry),
				parentId,
				seq: this.state.nextSequence,
				timestamp: Date.now(),
			} as unknown as TEntry;
			const mutation: SessionMutation = { kind: "entry", lane, entry };
			await this.appendMutation(mutation);
			this.applyMutation(mutation);
			return structuredClone(entry);
		});
	}

	appendRecord<TRecord extends LaneRecord>(newRecord: NewRecord<TRecord>): Promise<TRecord> {
		return this.enqueue(async () => {
			this.state.requireLane(newRecord.lane);
			this.state.validateUnusedId(newRecord.id);
			const currentOpenOperationId = this.state.findOpenOperations(newRecord.lane, { limit: 1 })[0]?.id;
			if (newRecord.type === "operation_started" && currentOpenOperationId !== undefined) {
				throw new SessionError(
					"storage",
					`Lane ${newRecord.lane} already has an open operation ${currentOpenOperationId}`,
				);
			}
			const record = {
				...structuredClone(newRecord),
				seq: this.state.nextSequence,
				timestamp: Date.now(),
			} as unknown as TRecord;
			const mutation: SessionMutation = { kind: "record", record };
			await this.appendMutation(mutation);
			this.applyMutation(mutation);
			return structuredClone(record);
		});
	}

	async getEntry(id: string): Promise<Entry | undefined> {
		const entry = this.state.getEntry(id);

View on GitHub (pinned to 4af9d21d3b)

Solutions

1. Close the open operation on that lane before appending a new one, or use a different lane.

When it happens

Trigger: Thrown at packages/agent/src/harness/session/jsonl/storage.ts:177 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/25aba480f95570ee. Report an issue: GitHub.