Two Anthropic engineers spent 24 minutes walking through every hidden corner of Claude Code. They started with the in-browser code editor: tab completion, inline type hints and a live REPL panel you may’ve missed. Tap “▶” next to any code block and watch it run immediately, with outputs—charts, tables or raw text—popping up in line. That alone cuts out switching to a separate terminal or juggling files. They then dove into custom tool plugins. You can hook Claude Code to APIs or local scripts by dropping a YAML manifest in your workspace. Once registered, the model calls your endpoint just like any native function. Forget copy-pasting data out of the editor—Claude streams results straight back into your chat. They showed a sample manifest for a currency-conversion API that updates live forex rates in your notebook. Next up: debugging and error analysis. Hit “Explain error” on any failed run and Claude produces step-by-step reasoning: it pinpoints the mismatched variable, suggests a fix and offers alternative code snippets. They used a broken pandas groupby example to demonstrate. Instead of wading through a stack trace, you get a concise bullet list: line numbers, root cause, quick patch. Finally, they explored collaboration features. Shared workspaces let teammates view your session in real time. You can leave comments on individual cells, mark sections as “draft” or “final,” and even lock critical scripts to prevent accidental edits. They concluded by showing a 10-user session where live typing and simultaneous tool calls barely caused lag. If you’ve treated Claude Code like a toy, this walkthrough proves it can handle full-scale development.