AI Agent returns an error | Agentic workflow

Questions
1

Hey folks. I’m working on building rate negotiator agent
but sometimes I got an error below

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Failed to parse. Text: "```json {{ "action": "Final Answer", "action_input": "Hey Bek, I appreciate your offer but $4,100 is a bit low for this route. How about we meet at $5,300? The load is really time-sensitive with a pickup on 03/10/2025, and involves some added logistics with e-tracks and straps. Let". Error: SyntaxError: Expected property name or '}' in JSON at position 1 Troubleshooting URL: https://js.langchain.com/docs/troubleshooting/errors/OUTPUT_PARSING_FAILURE/

Information on your n8n setup

  • n8n version: 1.73.0
  • Database (default: SQLite): Postgres
  • n8n EXECUTIONS_PROCESS setting (default: own, main): Selft hosted , gcloud
  • Running n8n via (Docker, npm, n8n cloud, desktop app): Docker based
2

Hi, your problem is the word "json " before the real json.

You have this:

json {{ "action": "Final answer"........ }}

but the correct version is

{{ "action": "Final answer"........ }}

M.

3

how can I fix that?

4

Try to add this sentence to your prompt:

“Reply only with a correct JSON object. No other words or sentence”

But the picture is the “output” from AI ?

5

Thanks @Michel_Morelli

yep we are getting this from ai agent , I mean in the picture output from ai agent node.

see these pictures please

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I added your sentence to my prompt and it is working
but is it the real solution ? I mean how can we prevent such problem in the future ?