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n8n errors and fixes: 2 guides

Real n8n failures, each with the error you'll see, the cause and steps that worked. 0 of 2 fixed upstream. Search within n8n.

Open: 1

n8nOpen
One bad tool call ends the whole agent run
The run ends with 'Received tool input did not match expected schema' and the user gets nothing.
Last checked 2026-10-15#tool-calls#schema3 steps →

Unverified: 1

n8nUnverified
AI Agent tools fail with 'schema must be type object, got None' after upgrading
After upgrading, the agent fails before calling any tool.
Last checked 2026-10-15#regression#tool-calls3 steps →

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