N8n ai agent Invalid 'text.format.name': string does not match pattern. Expected a string that matches the pattern '^[a-zA-Z0-9_-]+$'

[aseefdurrani]

Describe the problem/error/question

AI Agent throwing unexpected error

What is the error message (if any)?

n8n ai agent Invalid ‘text.format.name’: string does not match pattern. Expected a string that matches the pattern ‘^[1]+$’.

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Share the output returned by the last node

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1. a-zA-Z0-9_- ↩︎

[aseefdurrani]

If you are forcing a json schema, make sure you do not accidentally put a space anywhere in the schema.

I had a trailing space that I did not catch.

The fix was to remove any space characters from the schema name in the openai output model for the AI-Agent Node