Support or enable varying the list of available tools/resources per user

[Geasley]

Is your feature request related to a problem? Please describe.
I want to be able to return a different list of MCP servers back to users depending on the user's individual permissions. Unfortunately the list of available tools/resources/etc. is statically described at the root of the application.

Describe the solution you'd like
Provide a way to hook in to the listing call/endpoing without havint to intercept and immitate the JSON RPC response through a bespoke JSON constructing middleware (I don't want to have to maintain).

Describe alternatives you've considered
Implemented a bespokse JSON constructing middleware to intercept the list call (subsequent to the access control check)

[halter73]

Unfortunately the list of available tools/resources/etc. is statically described at the root of the application.

It's not static. McpServerOptions.Capabilities.Tools.ToolCollection is a thread-safe McpServerPrimitiveCollection<McpServerTool> that supports dynamic modification that allows you to add and remove tools dynamically. We even automatically send a tools/list_changed notification when you do.

You can also modify it at the start of each session when using Streamable HTTP. #222, #237, #476 and #612 cover similar requests and go over some of the options for specifying tools/resource per user by modifying the ToolCollection in ConfigureSessionOptions.

[PederHP]

@Geasley Here's an example of how to do what halter73 describes above.
#724

[Geasley]

Thanks! I really appreciate the pointer.