[Bug] MCP Tool Validation Error: Input should be a valid string

[leeginbernads]

What happened?

When attempting to load the honeycomb MCP server, HolmesGPT fails to initialize it due to a Pydantic validation error. The specific error message is:

✗ honeycomb: Failed to load mcp server honeycomb: 21 validation errors for ToolParameter
enum.0
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type
enum.1
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type
enum.2
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type
enum.3
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type
enum.4
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type
enum.5
  Input should be a valid string 
    For further information visit https://errors.pydantic.dev/2.12/v/string_type

What did you expect to happen?

I expected HolmesGPT to successfully load and initialize thehoneycomb mcp server.

How can we reproduce it (as minimally and precisely as possible)?

1 - Configure HolmesGPT to include the honeycomb MCP server in the configuration.
2 - Start the HolmesGPT application.
3 - Check the logs during the initialization phase to see the validation error.

Anything else we need to know?

I am running holmesgpt 0.24 in CLI.

A similar issue was fixed in #1459.

[coderabbitai]

🔗 Related PRs

#1501 - fix(mcp): Support nullable types in ToolParameter validation [merged]

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