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Skills give your agents new capabilities. Browse the catalog, pick what you need, and install with a single command.
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Manage persistent tmux terminal sessions: create, read, write to, list, and close named shell sessions. For Claude Code or Codex, use the ACP skill instead.
This skill manages persistent terminal sessions via tmux. Two modes:
| Sandbox Mode | Host Mode | |
|---|---|---|
| Where tmux runs | In the assistant's sandbox | On the user's host machine |
| How user connects | vellum terminal attach <session-name> | User opens their own terminal |
| Assistant access | Direct (bash tool) | Via host_bash |
| Best for | Long-running builds, servers, always-on tasks | Work needing host access (e.g. SwiftUI builds, host-local services) |
Default: Use Sandbox Mode unless the task specifically requires host access. Details: sandbox-sessions.md · host-sessions.md · tmux-best-practices.md
Sandbox Mode: No setup needed — tmux is available in the sandbox.
Host Mode: Requires tmux on the host — see host-sessions.md.
tmux list-sessions to get names and current commandstmux capture-pane -t NAME -p -S -50 (30-50 lines is usually enough)