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n8n errors / Schema

The workflow did not return a response

platform: n8n / category: Schema

Cause

An AI Agent sub-workflow tool ran but the parent got no structured output, typically because parallel branches converge without a Merge node and a race drops the final item.

Fix

Insert a Merge node (Combine) before the sub-workflow's final node to consolidate branches. Ensure the last node emits a JSON object with a 'response' key. For webhook sub-workflows, add a 'Respond to Webhook' node set to 'First incoming Item'. Test the sub-workflow in isolation first.

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