Problem Statement

There's already a discussion and implementation about logging: #301, and this issue could be use to discuss more details about the log implementation.

Also the cancelled_notification and progress_notification, maybe there are some design ideas they could share( all of them are notification).

Proposed Solution

java-sdk/python-skd idea

There are some great idea we can get inspiration from them.

pass the log/cancelled/progress capability to toolFunc, like java-sdk and python-skd

• java: in the tool function, develop could get McpSyncServerExchange object to send log notification
  
  

• python: like java-sdk, there is a Context develop could use to send log notification and progress notification
  https://github.com/modelcontextprotocol/python-sdk/blob/f2f4dbdcbd30fd00ced777fd1f59d00624362c97/src/mcp/server/fastmcp/server.py#L896

Proposal

We could pass more capability to ToolHandlerFunc to allow develop do more thing, mcp.CallToolRequest is not enough. Also we could do similar thing in the ResourceHandlerFunc、PromptHandlerFunc.

MCP Spec Reference

• https://modelcontextprotocol.io/specification/2025-03-26/server/utilities/logging#log-message-notifications
• https://modelcontextprotocol.io/specification/2025-03-26/basic/utilities/cancellation#cancellation
• https://modelcontextprotocol.io/specification/2025-03-26/basic/utilities/progress