Agent and options

The agent row lists every agent Heed knows, plus none, shell only. default_agent under [sessions] picks the one selected first.

The agent row and options, and the command the agent pane will run

Option
Autostart agent with prompt Type the command into the agent pane and run it. Off opens the pane with the command typed but not run.
Plan first Start the agent in its planning mode where it has one (claude's --permission-mode plan).
Open shell split A shell beside the agent. Defaults to shell_split under [sessions].

Will run in pane 1 shows the exact command line: the agent, the hook wiring Heed passes for this run (see Hooks), the session id it will resume by, and your prompt.