Delegate a substantive task to Claude Code, billed against the user's Claude Max / Pro subscription (model: claude-opus-4-7). Use this for: code generation, deep reasoning, multi-step engineering, refactoring, or anything that needs more capability than the routing model can reliably deliver. The receiver has NO memory of the calling agent's conversation — include everything Claude needs in the prompt argument: the user's verbatim request, project / file context, relevant prior messages, and what kind of output you want back. Returns Claude's full text response.