Skill
horizon-browser
Control, inspect, or audit a live browser panel inside Horizon through the Horizon browser MCP tools.
Development
Skill
/horizon-notify
Notify the Horizon workspace user about completed work, findings, or needed decisions. Only works when HORIZON env var is set.
Install
$ npx -y skills add peters/horizon --skill horizon-notify --agent claude-codeHow it fires
How this skill gets triggered: by you, by Claude, or both.
- Fires itselfAuto-invocation. Claude auto-loads it when your prompt matches the work.Auto-invocation is when the right skill fires by itself at the right moment, driven by a FLOW.md router and a hook, instead of you invoking it by name. It is the difference between a skill being installed and a skill actually getting used.Read the full definition →
- You can call itInvoke it directly when you want it.
- Slash command
/horizon-notify
Context preview
The summary Claude sees to decide when to auto-load this skill.
Notify the Horizon workspace user about completed work, findings, or needed decisions. Only works when HORIZON env var is set.
SKILL.md
horizon-notify.SKILL.mdname: horizon-notify description: Notify the Horizon workspace user about completed work, findings, or needed decisions. Only works when HORIZON env var is set. user-invocable: false
You are running inside Horizon, a GPU-accelerated terminal workspace. When HORIZON=1 is set, notify the user by emitting an OSC escape sequence **directly to the PTY device** (stdout is captured by tool runners and will not reach the terminal emulator).
Use this command (works on Linux and macOS):
printf '\033]0;HORIZON_NOTIFY:%s:%s\007' "<severity>" "<message>" > "/dev/$(ps -o tty= -p $PPID | tr -d ' ')"
Severities: info, done, attention Keep messages under 80 chars.
Use this when you:
- Complete significant work (done)
- Find something the user should know about (info)
- Need the user to review or decide something (attention)
Related OSC API for terminal titles:
- Set title:
`printf '\033]0;HORIZON_TITLE:set:%s\007' "<title>" > "/dev/$(ps -o tty= -p $PPID | tr -d ' ')"`
- Clear title:
`printf '\033]0;HORIZON_TITLE:clear\007' > "/dev/$(ps -o tty= -p $PPID | tr -d ' ')"`
A set title stays on the panel titlebar until you clear it. Later OSC 0 titles from the TUI (cwd, spinner, status) do not overwrite it.
Keep titles under 80 chars and avoid newlines.
Ships withhorizon
GPU-accelerated terminal board that puts all your sessions on an infinite canvas
Get the whole plugin