Type Mismatch in 'format_prompts' Method Due to 'arguments' Parameter in 'mcp-server'

[Doraemonwei]

In the processor.py, the following code:

    async def format_prompts(self, session):
        """Format the prompts for the MCP server"""
        prompts = []
        available_prompts = await session.list_prompts()
        logger.debug(f"PromptProcessor.format_prompts: Available prompts: {available_prompts}")

        for prompt in available_prompts.prompts:
            prompt_result = await session.get_prompt(prompt.name, prompt.arguments if prompt.arguments else {})
            formatted_prompt = {
                "name": prompt.name,
                "description": prompt_result.description,
                "messages": [{
                    "role": msg.role,
                    "content": msg.content.text
                } for msg in prompt_result.messages]
            }
            prompts.append(formatted_prompt)
        return prompts

Here, type(prompt.arguments) is list, but the second parameter of session.get_prompt() requires a dict type. Therefore, if the arguments parameter in the return value corresponding to the @server.list_prompts() annotation in the mcp-server is not an empty list, an error will definitely occur here.
The reason for this error is that in the mcp-server we previously wrote, the @server.list_prompts() annotation was used to return system prompts, so the arguments parameter was always an empty list. However, currently in various open - source mcp-server implementations, this annotation is used to generate special prompts for users based on the prompt name and parameters.

Since we don't seem to have a scenario where we generate special prompts based on the prompt name and parameters, we might be able to use the @server.list_prompts() annotation in the mcp-server specifically to store system prompts for this mcp-server.

---

This issue currently does not affect the main logic, so it is only recorded for now and will be changed later.