Function NewServerToolWithContextHandler

pkg/inventory/server_tool.go:128–149

NewServerToolWithContextHandler creates a ServerTool with a handler that receives deps via context. This is the preferred approach for tools because it doesn't create closures at registration time, which is critical for performance in servers that create a new instance per request. The handler func

(tool mcp.Tool, toolset ToolsetMetadata, handler mcp.ToolHandlerFor[In, Out])

// The handler function is stored directly without wrapping in a deps closure.
// Dependencies should be injected into context before calling tool handlers.
func NewServerToolWithContextHandler[In any, Out any](tool mcp.Tool, toolset ToolsetMetadata, handler mcp.ToolHandlerFor[In, Out]) ServerTool {
	return ServerTool{
		Tool:    tool,
		Toolset: toolset,
		// HandlerFunc ignores deps - deps are retrieved from context at call time
		HandlerFunc: func(_ any) mcp.ToolHandler {
			return func(ctx context.Context, req *mcp.CallToolRequest) (*mcp.CallToolResult, error) {
				var arguments In
				if err := json.Unmarshal(req.Params.Arguments, &arguments); err != nil {
					return &mcp.CallToolResult{
						Content: []mcp.Content{
							&mcp.TextContent{Text: fmt.Sprintf("invalid arguments: %s", err)},
						},
						IsError: true,
					}, nil
				}
				resp, _, err := handler(ctx, req, arguments)
				return resp, err
			}
		},
	}
}

// NewServerTool creates a ServerTool with a raw handler that receives deps via context.
// This is the preferred constructor for tools that use mcp.ToolHandler directly because