n8n-io/n8n · error · Error

Assistant handler not configured

Error message

Assistant handler not configured

What it means

Error "Assistant handler not configured" thrown in n8n-io/n8n.

Source

Thrown at packages/@n8n/ai-workflow-builder.ee/src/multi-agent-workflow-subgraphs.ts:435

				'discovery_subgraph',
				createSubgraphNodeHandler(
					'discovery',
					createCompiledSubgraphExecutor(
						discoverySubgraph,
						compiledDiscovery,
						MAX_DISCOVERY_ITERATIONS,
					),
					logger,
				),
			)
			// Add Assistant Subgraph Node (routes to SDK for help/debug queries)
			.addNode(
				'assistant_subgraph',
				createSubgraphNodeHandler(
					'assistant',
					async (state, nodeConfig) => {
						if (!assistantHandler) {
							throw new Error('Assistant handler not configured');
						}

						const query = extractUserRequest(state.messages);
						const userId = (nodeConfig?.configurable?.userId as string) ?? 'unknown';

						const streamWriter = getWriter(nodeConfig);

						let chunksDispatched = 0;
						const writer = (chunk: StreamChunk) => {
							if (streamWriter) {
								chunksDispatched++;
								streamWriter(chunk);
							}
						};

						const abortController = new AbortController();
						const timeoutId = setTimeout(() => abortController.abort(), ASSISTANT_SDK_TIMEOUT_MS);

View on GitHub (pinned to 5ac6606e81)

When it happens

Trigger: Thrown at packages/@n8n/ai-workflow-builder.ee/src/multi-agent-workflow-subgraphs.ts:435 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of n8n-io/n8n@5ac6606e81 (2026-08-12). Data as JSON: /api/errors/2444c25e60298019. Report an issue: GitHub.