Terminal tabs and plain tmux
The free baseline. tmux keeps sessions alive when you close a window and lets you split panes. You still check each pane by eye, answer every permission prompt where it appears, and copy results between sessions yourself.
A session manager in the terminal
Claude Squad and Agent Deck put a list of sessions in front of tmux. Both create a git worktree per session, which matters when several agents edit one repo. Claude Squad adds a diff tab and commit-and-push; Agent Deck adds forking and a web view. Details: Overvibe vs Claude Squad, Overvibe vs Agent Deck (asheshgoplani).
A terminal app made for agents
cmux is a native Mac terminal with vertical tabs and a notification ring when an agent needs you, plus a browser pane agents can script. It is a better terminal; coordinating agents is left to you. See Overvibe vs cmux.
A page where the agents work together
Overvibe (ours) shows every Claude Code, Codex and agy session in one sidebar on your Mac, each still the real CLI. Rows turn amber when a session needs you and prompts open as dialogs. The part the others do not have: an agent can start helpers with overvibe new --attach and get their answers back with overvibe send, so one coordinator runs the rest.
$ overvibe new --attach --tool codex --cwd ~/code/shop --name "shop: codex review" \
--prompt "Review db/migrations/0042_orders.sql for table locks and long transactions on a busy orders table. List each problem with the line and a fix. When done, run: overvibe send \"$OVERVIBE_SESSION\" \"<findings>\""
started "shop: codex review" in ~/code/shop (session pending, tmux d7a01e44), attached to this session
close it when you no longer need it: overvibe stop "shop: codex review"It does not create worktrees, so give parallel sessions separate folders or separate tasks.
Which one to pick
- Many agents editing one repo at once: a tool with worktrees.
- You want a better terminal and nothing else: cmux.
- You want one agent to hand parts to Codex and Gemini and collect the results: Overvibe.
Questions
Can I run multiple Claude Code sessions on one account?
Yes. Each session counts against the same plan limits, so many busy sessions reach the limit sooner.
Do parallel sessions conflict on the same repo?
They can, if two edit the same files. Worktrees give each session its own checkout; without them, give sessions different folders or different parts of the code.
Can Claude Code sessions talk to each other?
Claude Code has SendMessage between Claude sessions. To reach Codex or agy as well, Overvibe's overvibe send types a message into any session's terminal.