Tools in MCP Client Not Being Called

Describe the problem/error/question

I’m developing an AI Agent workflow that utilizes an MCP Client Tool to invoke a Home Assistant MCP with a tool named HandleChat. I have followed all the provided documentation:

• The MCP Client is successfully connected using SSE and authentication.
• HandleChat has been selected as the tool to be included.
• A Structured Output Parser is linked to the AI Agent, configured with the correct schema.
• The Ollama Chat Model is also connected and functioning as expected.
• The AI Agent is generating the correct JSON output, which is visible in the logs.

The core issue is that the AI Agent is not actually invoking the MCP Client tool, despite the output format being correct and matching the tool's name and structure.

What is the error message (if any)?

There isn't a specific error message. However, each run consistently displays:

“None of your tools were used in this run. Try giving your tools clearer names and descriptions to help the AI”

This occurs even though the tool is clearly named HandleChat, adequately described, and included in the tool list.

Please share your workflow

![image|690x368](upload://gTlT07fDpGDfFPsmlxHZenFIzuj.png)

Share the output returned by the last node

This is the output from the AI Agent after parsing, which is expected to trigger the tool:

{
“tool”: “HandleChat”,
“input”: “Turn on corner torche”
}

Information on your callin.io setup

• callin.io version: 1.94.1
• Database (default: SQLite): SQLite
• callin.io EXECUTIONS_PROCESS setting (default: own, main): own
• Running callin.io via (Docker, npm, callin.io cloud, desktop app): Docker
• Operating system: Fedora 42