We Just Made an MCP Tool That Spawns Claude Code Sessions. Here's Why That Matters.

I’ve been building OpZero — an AI-native deployment platform that started as a way to get vibe-coded apps onto the internet without friction. Deploy from conversation, no git push, no CI/CD pipeline. It works. Ship an app to Cloudflare Pages in 2 seconds from a chat message. But the thing we got working last night changes what OpZero actually is . An MCP tool that starts Claude Code sessions We deployed a claude_session_start MCP tool on Railway. It connects to a repo, spins up a Claude Code session, executes a task, and returns the result. A fully autonomous coding agent, callable as a tool by another agent. The first successful run pointed at our own repo. Claude Code responded with "Hello! Ready to help with your OpZero project." and exited cleanly with code 0. That's agents spawn``ing agents. And it works. Why this isn't just a party trick The AI tooling ecosystem right now has a composition problem. You've got MCP servers that give agents hands — they can deploy, search, query dat