Show HN: Let your AI agents paint big arrows, boxes and text on your screen

Developer Franz Zenhofer released bigarrow, an MIT-licensed macOS CLI and agent skill that lets AI agents draw click-through arrows, boxes and text on screen to point a human at a specific button or window without stealing focus or requiring any permission. The tool installs via `brew install franzenzenhofer/tap/bigarrow` and `bigarrow install-skill`, which teaches Claude Code (~/.claude/skills) and Codex (~/.agents/skills), and targets elements by label, coordinate, rectangle, mouse position, window or Peekaboo snapshot ID. It never clicks, types or captures anything, and is built as a single Swift binary requiring Xcode 16 or newer and macOS 14 or newer.

big-arrow-on-the-screen bigarrow : one small macOS CLI and an agent skill. Click-through, never steals the focus, gone by itself. MIT. Your AI agent can refactor a monorepo, write a migration and explain monads, but when it needs you to click one button it prints "please click Allow in the dialog" into a terminal you are not looking at. bigarrow gives it a finger. bigarrow point --element "Allow" --app "System Settings" --text "Franz, click Allow" A big, friendly arrow with a sign appears on top of everything, points at the thing, and goes away again. It is click-through, it never steals your focus, it works on every display and every Space, and it needs no permission at all to draw. It is one small Swift binary. There is no daemon, no menu-bar icon, no account, no telemetry, and, we checked twice, no AI inside. It is an arrow. Fair question. Arrows have existed since roughly the Paleolithic. Here is what changed: software agents now do real work on your Mac, and they keep hitting the same wall, the part that only a human may do. - "Click Allow." macOS permission prompts, OAuth consent screens, "Open with...?" dialogs. The agent can find the button but must not, or cannot, press it for you. It can now point at it. - "Your turn." 2FA codes, CAPTCHAs, passkeys, a payment confirmation, a signature, a legal checkbox. The things an agent should never click on its own behalf. It points, you decide, it continues. - "It's this window, not that one." You have 14 Chrome windows. The agent knows which one it means: --window "Google Chrome:Pull request" --raise . - "I need you, and you're making coffee." --say reads the sign aloud. Your Mac will literally call you back to your desk. - Guided setups and onboarding. Walk a human through a settings pane step by step: start , wait until they acted, stop , next step. Like a product tour, minus the product. - Remote help. "No, the other gear icon." Point at it instead of describing it. - Demos, screencasts, docs. Highlight what matters while recording, or render the arrow straight into a PNG with --png for documentation. - Debugging coordinates. Not sure your Accessibility, screenshot or Peekaboo coordinates are right? Point at them and look. --dry-run --json tells you where it would point without drawing. Staged with a neutral demo dialog and recorded with the real bigarrow on a test Mac scripts/funny-scenes.sh . The dialogs are fake. The feelings are real. | --color green | --shape zigzag --color orange | | --color purple | --close-button , because the human gets the last word | | three start s, one button, zero ambiguity | --style box --corners sharp , plus a lesson about macOS permissions | What it is not: a screen annotator for humans, a click bot, or a screenshot tool. It never clicks, types or captures anything. It only points. Deliberately. brew install franzenzenhofer/tap/bigarrow bigarrow install-skill teaches Claude Code ~/.claude/skills and Codex ~/.agents/skills From source: swift build -c release Xcode 16 or newer, macOS 14 or newer , binary at .build/release/bigarrow . bigarrow point --element "Allow" --app "System Settings" --text "Franz, click Allow" by label bigarrow point --at 760,500 --text "Franz, click HERE" by coordinate bigarrow start --window "Safari:Inbox" --raise --text "This window" && bigarrow stop until stopped Three ways an arrow ends, pick your level of commitment: | Time limit | bigarrow point ... --duration 10 default 8 s | | Start and stop | bigarrow start ... returns at once; bigarrow stop or stop --all removes it | | The human closes it | bigarrow point ... --close-button puts a clickable X on the sign | Targets: --at X,Y , --rect X,Y,W,H , --mouse , --window App :title , --element Label --app App , --peekaboo ID --snapshot see.json from Peekaboo's see --json . Coordinates are global top-left logical points, the space Accessibility, CGWindowList and Peekaboo report. --display N makes --at and --rect relative to one display. bigarrow front --app X or point --raise brings the target's app to the front first, because pointing at a window hidden behind your terminal is a special kind of unhelpful. bigarrow elements --app X lists what --element can match. bigarrow doctor shows permissions, who owns them, and your displays. Every command takes --json . Exit codes: 0 ok, 2 bad input, 3 target not found, 4 permission missing. Agents love exit codes. Humans tolerate them. It is an arrow, so we spent an unreasonable amount of time on how it looks. - --shape bend|straight|zigzag zigzag for when it is really urgent - --style arrow|ring|box ; rings and boxes are border-only, so you still see what is under them - --size S|M|L , --corners round|sharp - --color red|orange|yellow|green|teal|blue|purple|pink|black|white| RRGGBB ; light colours automatically get a dark outline and text - --follow moves with a window or element, --until-click ends on a click on the target, --say speaks the sign - Several arrows at once keep their signs out of each other's way the HN shot above is five independent bigarrow start calls The shaft grows out of the sign through a flared joint that never runs into a rounded corner. scripts/gallery.py renders every combination offscreen and zooms into every joint junctions https://github.com/franzenzenhofer/big-arrow-on-the-screen/blob/main/docs/images/junctions.png , because a seam at the joint was, apparently, unacceptable. Does it need Screen Recording or Accessibility? Drawing needs neither. --element , elements , --until-click and front --window use Accessibility, which macOS grants to the app that runs your shell Terminal, iTerm2, Ghostty, VS Code, Claude , never to bigarrow itself. bigarrow doctor names that app, and exit code 4 tells the agent exactly what to ask you for. --window App:title reads window titles, which macOS 26 hides without Screen Recording; --window App alone needs nothing. Will it steal my focus while I'm typing? No. That was the hardest bug in the project: NSApplication.run quietly activates a process that has no terminal, so detached arrows grabbed the focus. bigarrow pumps events itself instead, and the tests check that the frontmost app never changes. Can I click through it? Yes, everywhere except the optional X, which is its own tiny panel that also never takes the focus. Multiple displays? Full-screen apps? Stage Manager? Spaces? Yes, yes, yes, yes. Displays left of or above the main one negative coordinates included. Unplug a display while an arrow is on it and the arrow politely leaves. See the verification matrix https://github.com/franzenzenhofer/big-arrow-on-the-screen/blob/main/docs/verification/multi-display.md . How much CPU does a pulsing arrow cost? 1.4 % measured on a CI runner. Core Animation does the work in the render server. Does --element work inside web pages? In Electron apps, yes. In Chrome, only when Chrome runs with --force-renderer-accessibility or VoiceOver is on ; Chrome ignores the usual request to expose page content, verified on Chrome in October 2026. Chrome's own toolbar always works. Otherwise point at the page's coordinates, which the skill explains. Why not just use some screen annotation app ? Those are for humans drawing on screens. This is for programs pointing at things, from a shell, with exit codes. Twenty-six tools were checked before writing a line research https://github.com/franzenzenhofer/big-arrow-on-the-screen/blob/main/docs/research . None did this. Is it AI? No. It is the least intelligent part of your AI stack, and proud of it. - 76 automated tests: geometry, placement, joint smoothness, a golden image, recorded window-server, Accessibility and Peekaboo 4.9.0 fixtures, and tests against the real window server window level 1000, clicks pass through, focus never moves, detach and stop timing . CI runs them on macOS 15; they also passed on macOS 26 and macOS 27. - 17 behaviour checks on a clean runner visual.yml https://github.com/franzenzenhofer/big-arrow-on-the-screen/blob/main/.github/workflows/visual.yml : real clicks on the X, --until-click , --follow , --raise , --say , full-screen apps, Stage Manager, a Space switch, a second display, a 2x display, unplugging a display mid-arrow, CPU. The demo GIF above is recorded by the same workflow, on a desktop with nothing personal on it. - A fresh agent given only the skill and "show Franz where the Reload button in Chrome is" found it by label and built the right command transcript https://github.com/franzenzenhofer/big-arrow-on-the-screen/blob/main/docs/skill-tests/2026-10-08-chrome-reload.md . It also found a bug, which is now a test. The skill in skill/big-arrow/ works for both Claude Code and Codex one SKILL.md , Agent Skills format, plus agents/openai.yaml for Codex . It tells the agent when to point, how to pick a target, to write a full sentence on the sign, to add --say when you are probably not looking, and to stop once you have acted. docs/plan/PLAN.md goal, architecture, risks , docs/plan/TICKETS.md generated from docs/plan/tickets.json , docs/decisions/ , docs/research/ verified facts with links , docs/verification/ , docs/skill-tests/ , CHANGELOG.md . Peekaboo's visualizer https://github.com/openclaw/Peekaboo https://github.com/openclaw/Peekaboo and Nameplate https://github.com/steipete/Nameplate https://github.com/steipete/Nameplate by Peter Steinberger showed the overlay window recipe and the agent-skill packaging. Neither draws a pointing arrow with a label, which is the gap this project fills. bigarrow reads Peekaboo's see --json as an optional target source. MIT. Point responsibly.