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Type / in the composer and a menu lists every command, with the arguments it expects. Keep typing to filter. Pick one with Enter, or type the whole line and press Enter to send it. Commands come in two kinds. Some expand into a prompt: /triage checkout becomes a full triage request with your argument filled in, and the message you sent still reads /triage checkout so you can see what shaped it. Others do something in the app: /mode yolo changes the posture and sends nothing.

Built-in commands

A few examples as you would type them:

Custom commands

A custom command is a Markdown file. The file name is the command name, and the body is the prompt Kepler receives. Put $ARGUMENTS where your input should go. Two places to keep them: A file looks like this:
Save it as capacity-brief.md and /capacity-brief checkout appears in the menu. description is what the menu shows, and argument-hint is the placeholder next to it. Both are optional. If there is no description, the first line of the body is used. Positional arguments work too: $1, $2 and so on pick out the first, second and later words, and quoted arguments count as one word. {{args}} is accepted as an alias for $ARGUMENTS. A command with no placeholder gets your arguments appended to the end. The quickest way to make one is to ask:
Kepler picks a name, writes the description and body, and saves the file. It defaults to the global folder unless you say “this workspace”.

Skills in the menu

Skills also appear in the / menu, marked Skill. A skill is not a request, it is an approach: picking one tells Kepler how to handle the message you write yourself. A skill takes no arguments, can sit anywhere in the line, and several can ride one message.
Skills live in ~/.kepler/skills/<name>/SKILL.md for every workspace, or <workspace>/.kepler/skills/<name>/SKILL.md for one. Drop a folder there, or manage them under Settings > Customize. Claude Code skill folders are read as they are. See Extend Kepler for writing one.

Keyboard shortcuts

macOS shortcuts use Cmd. On Windows and Linux use Ctrl in its place, except where the table says otherwise.

Window and panels

Composer

Approvals

Terminal panel

Plain Ctrl+C in the terminal goes to the running program, as it does in any shell.

Where to go next

Extend Kepler

Skills, specialist agents and MCP servers.

Postures

What /mode changes and what each posture asks you about.

The workspace

The panels these shortcuts open.

Workflows

Prompt recipes built on /triage, /rca and /runbook.