Tab completion

Press Tab to complete the token just before the cursor. One match replaces the token outright — with a trailing / for a directory or a space for a file. Several matches fill in their longest common prefix and list the candidates above the command bar; no match does nothing.

What gets completed depends on where in the command you are:

Context	Candidates
The recipient of msg	Active agent names
The recipient of broadcast	Active agent names, plus all; completes each segment of a comma-separated list (ahmed,bil → ahmed,bilal)
The target of connection close	Open connection strings (sqlite:my-db, shell:bash, acp:opencode, browser:w1)
After browser	Browser subcommands; for those that take a window id (browser use, browser window close), the current tab's open window ids
Anywhere else	Filesystem paths, relative to the tab's working directory

Path completion expands ~ to your home directory, and hides dotfiles unless what you've typed already starts with a ..