Difficulties with Vaadin MCP

General
1

I have used Vaadin MCP successfully in the past. Now both ChatGPT (dev mode) and AWS Kiro complain about inconsistencies between tool definition.

I can see the following tool in ChatGPT: get_vaadin_version.

However, when I call it, the MCP server responds: Tool get_vaadin_version not found.

Is this a know issue or am i something missing?

Note: maybe useful to add a category “AI development”? (Vaadin MCP / Skills)

2

What’s the URL that you’re using for the MCP? Vaadin MCP Server?

There is no get_vaadin_version tool on the MCP server, only get_latest_vaadin_version and get_supported_vaadin_versions.

What model are you using with ChatGPT?

3

https://mcp.vaadin.com/docs. GPT-5.5. I removed the MCP configuration and reinstalled it again (restarting everything) and now it is working in ChatGPT.

For Kiro the problem seems different (kiro-cli 2.10.0 using Opus 4.8). It calls the right get_latest_vaadin_version tool. However, it never answers and the request is timed out.

Config: {
   "mcpServers": {
    "vaadin": {
      "type": "http",
      "url": "https://mcp.vaadin.com/docs"
    }
  }
}

What is strange is that it worked not long ago. Is the MCP server updated recently?

4

Hm. I just tried both tools with my MCP inspector and they returned correctly. Wonder what the difference is :thinking:

5

Okay, the two issues were completely unrelated. The correct Kiro configuration is in ~/.kiro/settings/mcp.json:

{
   "mcpServers": {
    "vaadin": {
      "url": "https://mcp.vaadin.com/docs"
    }
  }
}

After reloading it now works.