Parsing MCP response from request to server when using OpenAPI spec

[joostsijm]

Thanks for this nice project! I am trying out a FastMCP using from_openapi and made a connection through VS Copilot. But when an MCP action is executed, I receive an error of the following kind. I am looking for advice how to start debug this exception, does this relates to an issue in my OpenAPI spec? I run the server with sse as transport option.

Error: tool parameters do not match JSON schema: /properties/kind/enum must NOT have duplicate items

In the MCP inspector, when I call an endpoint, I receive the following error.

MCP error 0: 2 validation errors for ReadResourceResult contents.0.TextResourceContents
Input should be a valid dictionary or instance of TextResourceContents [type=model_type, input_value=None, input_type=NoneType] 
For further information visit https://errors.pydantic.dev/2.11/v/model_type contents.0.BlobResourceContents
Input should be a valid dictionary or instance of BlobResourceContents [type=model_type, input_value=None, input_type=NoneType]
For further information visit https://errors.pydantic.dev/2.11/v/model_type

This uses version 2.2.0