Support loading tools from createSdkMcpServer into Claude Code

Currently there is no easy way to load tools created using `createSdkMcpServer` (in process mcp servers) inside a dedicated Claude Code session.

For example, I have tools that I created for an agent using Claude Agent SDK. To test these tools efficiently, I want to easy to load these tools into my local Claude Code session and let Claude Code use these tools and debug problems issues.

The only solution now seems to be publishing the tools as proper MCP servers and load them in Claude Agent SDK and Claude Code, but I think it should be possible to allow loading tools created by `createSdkMcpServer` inside Claude Code.