You'll notice
Resuming a session that is already running elsewhere starts a copy and points you to claude attach to join the live one.
Trying to continue or resume a session id that's already running elsewhere (a background job, another process, or a handle conflict) now starts a copy of it instead of attaching, and prints a note explaining why, pointing to claude attach as the way to join the live session.
Names in the bundleclaude attach
The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.
Confirmed since
Anthropic's documentation has since written up claude attach, on Manage multiple agents with agent view.
| `claude attach <id>` | Attach to a session in this terminal |agent-view see the edit
One source agreesOne thing we can check says the same as this entry.
Anthropic's documentation agrees
Anthropic's documentation has since written up claude attach, on Manage multiple agents with agent view.