Specify title for a prompt argument?

[kamranayub]

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• I have checked that this question would not be more appropriate as an issue in a specific repository
• I have searched existing discussions and documentation for answers

Question Category

• Protocol Specification
• SDK Usage
• Server Implementation
• General Implementation
• Documentation
• Other

Your Question

In the protocol spec for a PromptArgument, you should be able to set a title used for display purposes. I think Claude Desktop might use this, for example. However, I don't think there's a way to set this via SDK -- at least not from the tests and cursory search I did of the codebase. You can only set [Description]string myParam.

This could be converted into an issue if this is missing, otherwise I might be missing something?

PS: As a bonus, it would be nice to override the name too. Since employeeId in Claude becomes Employeeid 😅 (This is why I think it supports title, if only I could provide it).

[ryux1]

The protocol type does support this, but the attribute/reflection path still does not populate it.

In current main, PromptArgument has a Title property, but AIFunctionMcpServerPrompt.Create builds each argument using only:

• Name = param.Name
• the JSON-schema description
• whether the property is required

So [Description] works for the description, while there is currently no prompt-parameter attribute that sets PromptArgument.Title. The advertised name is the generated JSON-schema property name; there is no MCP-specific parameter-name override either.

Sources:

• PromptArgument
• argument projection in AIFunctionMcpServerPrompt

If you need a title today, the supported escape hatches are to register a custom McpServerPrompt whose ProtocolPrompt.Arguments you construct directly, or take over prompt listing/getting with WithListPromptsHandler plus WithGetPromptHandler. For ordinary reflected prompts, this still looks like a missing SDK feature rather than something configurable through [McpServerPrompt].