My MCP client execute tool keeps failing. see images. i am missing a config somewhere. i am not sure about the MCP tool name and paramters. where do i find the name and parametters in MCP node.
I am wondering if i need to install another MCP Node fot execute tools to get the name and parameters there.
Hi @Syphe_IT
Could you please provide the workflow?
HI @Msquare_Automation i am a beginner with AI, i am just going through some examples on you tube.I am following along this youtube https://www.youtube.com/watch?v=1QR-fz-JCA4 but stuck at the 7:59 Point.
Hi @Syphe_IT
It looks like the YouTube video you’re watching doesn’t cover the full MCP setup. For a clearer explanation, you can check out our video — I’ll share two links below.
Click Here :https://www.youtube.com/watch?v=8EOeBXXw3DM
@Syphe_IT
If you have any doubts, feel free to ask anytime .
i dont doubt you one bit.
Oh, I meant if you have any doubts regarding n8n, feel free to ask anytime.
I think i need to get more credit.
Hi @Syphe_IT
Could you specify what did you mean by credits
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This fixed it for me:
Fix the $fromAI type mismatch
The single most effective solution involves explicitly declaring data types in the $fromAI function. Many users unknowingly allow n8n to auto-detect types, which defaults to ‘string’ even when JSON objects are needed. n8n +3 Replace any “Defined automatically by the model” configurations with manual expressions:
javascript// For JSON data - explicitly specify ‘json’ type
{{ $fromAI(‘searchParams’, ‘Search parameters object’, ‘json’) }}
// For strings - be explicit even though it’s the default
{{ $fromAI(‘userName’, ‘Name of the user’, ‘string’) }}
// For numbers with defaults
{{ $fromAI(‘quantity’, ‘Number of items’, ‘number’, 1) }}
This simple change alone resolves the error for approximately 70% of reported cases. The key insight is that n8n’s UI often resets the type to ‘string’ even after setting it to ‘json’, requiring manual expression entry to maintain the correct type. n8n
Thank you Jonas, this is good information. I am new to n8n and AI in general. My project is a youtube project that uses Brave brower web tools in MCP..i need to entter the name of tool and paramettes into the execute tools , but when i execute the agent it fails. Here is the youtube video.https://www.youtube.com/watch?v=1QR-fz-JCA4&t=332s thank you soo much. let me know if you can help.
