Attribute Macro tool_handler 

#[tool_handler]

tool_handler

This macro will generate the handler for tool_call and list_tools methods in the implementation block, by using an existing ToolRouter instance.

Usage

field	type	usage
router	Expr	The expression to access the ToolRouter instance. Defaults to self.tool_router.

Example

#[tool_handler]
impl ServerHandler for MyToolHandler {
    // ...implement other handler
}

or using a custom router expression:

#[tool_handler(router = self.get_router().await)]
impl ServerHandler for MyToolHandler {
   // ...implement other handler
}

Explain

This macro will be expended to something like this:

impl ServerHandler for MyToolHandler {
       async fn call_tool(
        &self,
        request: CallToolRequestParams,
        context: RequestContext<RoleServer>,
    ) -> Result<CallToolResult, rmcp::ErrorData> {
        let tcc = ToolCallContext::new(self, request, context);
        self.tool_router.call(tcc).await
    }

    async fn list_tools(
        &self,
        _request: Option<PaginatedRequestParams>,
        _context: RequestContext<RoleServer>,
    ) -> Result<ListToolsResult, rmcp::ErrorData> {
        let items = self.tool_router.list_all();
        Ok(ListToolsResult::with_all_items(items))
    }
}