feature: MCPServer object should provide a GetTool() method

[duaraghav8]

Problem Statement

It is easy to add a tool to an MCPServer object by running server.AddTool(tool, handler) where tool is mcp.NewTool("name", ...ToolOption).

But there is no way to get back a particular tool from the mcp server given its name.

So it is inconvenient to have to keep track of the tools separately.

Proposed Solution

Add a convenience method to the MCPServer object: server.GetTool("name") (*Tool, error).
If I specify the name, it can return the Tool object that was originally added to it.

Example Usage

       mcpServer := server.NewMCPServer(
		"my-tools",
		"1.0.0",
		server.WithToolCapabilities(true),
	)

	echoTool := mcp.NewTool(
		"echo",
		mcp.WithDescription("echoes back your message"),
		mcp.WithString(
			"message",
			mcp.Description("Your message"),
			mcp.Required(),
		),
	)
	mcpServer.AddTool(echoTool, handleEchoToolCall)

        // Now, get back the Tool object in some other part of the code
        tool, err := mcpServer.GetTool("echo")

Alternatives/Workarounds Considered

Currently, I have to maintain a separate mapping of name to the Tool object - map[string]*Tool
Its much cleaner if the library provides this mapping.

[dugenkui03]

There is a PR for this issue #437

[duaraghav8]

👀 thanks. I'll close this issue.