ATL — Agent Touch Layer

The automation layer between AI agents and iOS

ATL provides HTTP-based automation for iOS Simulator — both browser (mobile Safari) and native apps. Think Playwright, but for mobile.

🔀 Two Servers: Browser & Native

ATL uses two separate servers for browser and native app automation:

Server	Port	Use Case	Key Commands
Browser	9222	Web automation in mobile Safari	goto, markElements, clickMark, evaluate
Native	9223	iOS app automation (Settings, Contacts, any app)	openApp, snapshot, tapRef, find

┌─────────────────────────────────────────────────────────────┐
│  BROWSER SERVER (9222)     │     NATIVE SERVER (9223)      │
│  (mobile Safari/WebView)   │     (iOS apps via XCTest)     │
│                            │                                │
│  markElements + clickMark  │     snapshot + tapRef         │
│  CSS selectors             │     accessibility tree        │
│  DOM evaluation            │     element references        │
│  tap, swipe, screenshot    │     tap, swipe, screenshot    │
└─────────────────────────────────────────────────────────────┘

Why two ports? Native app automation requires XCTest APIs (XCUIApplication, XCUIElement) which are only available in UI Test bundles. The native server runs as a UI Test that exposes an HTTP API.

Starting the Servers

# Browser server (starts automatically with AtlBrowser app)
xcrun simctl launch booted com.atl.browser
curl http://localhost:9222/ping  # → {"status":"ok"}

# Native server (run as UI Test)
cd ~/Atl/core/AtlBrowser
xcodebuild test -workspace AtlBrowser.xcworkspace \
  -scheme AtlBrowser \
  -destination 'id=<SIMULATOR_UDID>' \
  -only-testing:AtlBrowserUITests/NativeServer/testNativeServer &

# Wait for it to start, then:
curl http://localhost:9223/ping  # → {"status":"ok","mode":"native"}

Quick Port Reference

Task	Port	Example
Browse websites	9222	curl localhost:9222/command -d '{"method":"goto",...}'
Open native app	9223	curl localhost:9223/command -d '{"method":"openApp",...}'
Screenshot (browser)	9222	curl localhost:9222/command -d '{"method":"screenshot"}'
Screenshot (native)	9223	curl localhost:9223/command -d '{"method":"screenshot"}'

---

📱 Native App Automation (Port 9223)

Native automation uses port 9223 and automates any iOS app using the accessibility tree — no DOM, no JavaScript, just direct element interaction.

Opening & Closing Apps

# Open an app by bundle ID
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"openApp","params":{"bundleId":"com.apple.Preferences"}}'
# → {"success":true,"result":{"bundleId":"com.apple.Preferences","mode":"native","state":"running"}}

# Check current app state
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"appState"}'
# → {"success":true,"result":{"mode":"native","bundleId":"com.apple.Preferences","state":"running"}}

# Close current app
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"closeApp"}'
# → {"success":true,"result":{"closed":true}}

Common Bundle IDs

App	Bundle ID
Settings	com.apple.Preferences
Contacts	com.apple.MobileAddressBook
Calculator	com.apple.calculator
Calendar	com.apple.mobilecal
Photos	com.apple.mobileslideshow
Notes	com.apple.mobilenotes
Reminders	com.apple.reminders
Clock	com.apple.mobiletimer
Maps	com.apple.Maps
Safari	com.apple.mobilesafari

The snapshot Command

snapshot returns the accessibility tree — all visible elements with their properties and tap-able references.

curl -s -X POST http://localhost:9223/command \
  -d '{"method":"snapshot","params":{"interactiveOnly":true}}' | jq '.result'

Example output:

{
  "count": 12,
  "elements": [
    {
      "ref": "e0",
      "type": "cell",
      "label": "Wi-Fi",
      "value": "MyNetwork",
      "identifier": "",
      "x": 0,
      "y": 142,
      "width": 393,
      "height": 44,
      "isHittable": true,
      "isEnabled": true
    },
    {
      "ref": "e1",
      "type": "cell",
      "label": "Bluetooth",
      "value": "On",
      "identifier": "",
      "x": 0,
      "y": 186,
      "width": 393,
      "height": 44,
      "isHittable": true,
      "isEnabled": true
    },
    {
      "ref": "e2",
      "type": "button",
      "label": "Back",
      "value": null,
      "identifier": "Back",
      "x": 0,
      "y": 44,
      "width": 80,
      "height": 44,
      "isHittable": true,
      "isEnabled": true
    }
  ]
}

Parameters:

• interactiveOnly (bool, default: false) — Only return hittable elements
• maxDepth (int, optional) — Limit tree traversal depth

The tapRef Command

Tap an element by its reference from the last snapshot:

# Take snapshot first
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"snapshot","params":{"interactiveOnly":true}}'

# Tap element e0 (Wi-Fi cell from example above)
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"tapRef","params":{"ref":"e0"}}'
# → {"success":true}

The find Command

Find and interact with elements by text — no need to parse snapshot manually:

# Find and tap "Wi-Fi"
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"find","params":{"text":"Wi-Fi","action":"tap"}}'
# → {"success":true,"result":{"found":true,"ref":"e0"}}

# Check if an element exists
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"find","params":{"text":"Bluetooth","action":"exists"}}'
# → {"success":true,"result":{"found":true,"ref":"e1"}}

# Find and fill a text field
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"find","params":{"text":"First name","action":"fill","value":"John"}}'

# Get element info without interacting
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"find","params":{"text":"Cancel","action":"get"}}'
# → {"success":true,"result":{"found":true,"ref":"e5","element":{...}}}

Parameters:

• text (string) — Text to search for (matches label, value, or identifier)
• action (string) — One of: tap, fill, exists, get
• value (string, optional) — Text to fill (required for action:"fill")
• by (string, optional) — Narrow search: label, value, identifier, type, or any (default)

---

🔄 Native App Workflow Example

Here's a complete flow: open Settings, navigate to Wi-Fi, take a screenshot:

# 1. Open Settings app
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"openApp","params":{"bundleId":"com.apple.Preferences"}}'

# 2. Wait for app to launch
sleep 1

# 3. Take snapshot to see available elements
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"snapshot","params":{"interactiveOnly":true}}' | jq '.result.elements[:5]'

# 4. Find and tap Wi-Fi
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"find","params":{"text":"Wi-Fi","action":"tap"}}'

# 5. Wait for navigation
sleep 0.5

# 6. Take screenshot of Wi-Fi settings
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"screenshot"}' | jq -r '.result.data' | base64 -d > /tmp/wifi-settings.png

# 7. Navigate back (swipe right from left edge)
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"swipe","params":{"direction":"right"}}'

# 8. Close the app
curl -s -X POST http://localhost:9223/command \
  -d '{"method":"closeApp"}'

Helper Script Version

source ~/.openclaw/skills/atl-browser/scripts/atl-helper.sh

atl_openapp "com.apple.Preferences"
sleep 1
atl_find "Wi-Fi" tap
sleep 0.5
atl_screenshot /tmp/wifi-settings.png
atl_swipe right
atl_closeapp

---

💡 Core Insight: Vision-Free Automation

ATL's killer feature is spatial understanding without vision models:

┌─────────────────────────────────────────────────────────────┐
│  markElements + captureForVision = COMPLETE PAGE KNOWLEDGE  │
└─────────────────────────────────────────────────────────────┘

1. markElements  → Numbers every interactive element [1] [2] [3]
2. captureForVision → PDF with text layer + element coordinates
3. tap x=234 y=567 → Pixel-perfect touch at exact position

Why this matters:

• No vision API calls — zero token cost for "seeing" the page
• Faster — no round-trip to GPT-4V/Claude Vision
• Deterministic — same page = same coordinates, every time
• Reliable — pixel-perfect coordinates vs. vision interpretation

The Vision-Free Workflow

# 1. Mark elements (adds numbered labels + stores coordinates)
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"1","method":"markElements","params":{}}'

# 2. Capture PDF with text layer (machine-readable, has coordinates)
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"2","method":"captureForVision","params":{"savePath":"/tmp","name":"page"}}' \
  | jq -r '.result.path'
# → /tmp/page.pdf (text-selectable, contains element positions)

# 3. Get specific element's position by mark label
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"3","method":"getMarkInfo","params":{"label":5}}' | jq '.result'
# → {"label":5, "tag":"button", "text":"Add to Cart", "x":187, "y":432, "width":120, "height":44}

# 4. Tap at exact coordinates
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"4","method":"tap","params":{"x":187,"y":432}}'

The marks tell you WHERE everything is. The PDF tells you WHAT everything says. Together = full page understanding.

🎯 The Escalation Ladder

When automation gets stuck, escalate through these levels:

┌─────────────────────────────────────────────────────────────┐
│  Level 1: COORDINATES (fast, cheap, no API calls)          │
│  markElements → getMarkInfo → tap x,y                      │
│                                                             │
│  ↓ If stuck after 2-3 tries...                             │
│                                                             │
│  Level 2: VISION FALLBACK (screenshot to understand state) │
│  screenshot → analyze UI → identify blockers (modals, etc) │
│                                                             │
│  ↓ If still stuck...                                       │
│                                                             │
│  Level 3: JS INJECTION (direct DOM manipulation)           │
│  evaluate → dispatchEvent → force interactions             │
└─────────────────────────────────────────────────────────────┘

When to Escalate

Symptom	Likely Cause	Action
Tap succeeds but nothing changes	Modal/overlay opened	Screenshot → find new button
Cart count doesn't update	Site needs login or has bot detection	Try JS click with events
Element not found after scroll	Marks are page-relative, not viewport	Use getBoundingClientRect via evaluate
Same error 3+ times	UI state changed unexpectedly	Screenshot to see actual state

Real-World Pattern: E-commerce Checkout

# 1. Search and find product
atl_goto "https://store.com/search?q=headphones"
atl_mark

# 2. First, dismiss any modals/banners (ALWAYS DO THIS)
# Look for: close, dismiss, continue, accept, no thanks, got it
CLOSE=$(atl_find "close")
[ -n "$CLOSE" ] && atl_click $CLOSE

# 3. Find and click Add to Cart
ATC=$(atl_find "Add to cart")
atl_click $ATC

# 4. Wait, then CHECK if it worked
sleep 2
atl_screenshot /tmp/after-click.png

# 5. If cart didn't update, LOOK at the screenshot
# Maybe a "Choose options" modal opened - find the NEW Add to Cart button
# This is the vision fallback - you need to SEE what happened

Key Insight: Modals Change Everything

When you click "Add to cart" on sites like Target, Amazon, etc., they often:

1. Open a "Choose options" modal (size, color, quantity)
2. Show an upsell (protection plans, accessories)
3. Display a confirmation with "View cart" or "Continue shopping"

Your original tap WORKED — you just can't see the result without a screenshot.

🚀 Quick Start (30 seconds)

# 1. Setup (boots sim, installs ATL)
~/.openclaw/skills/atl-browser/scripts/setup.sh

# 2. Navigate somewhere
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"1","method":"goto","params":{"url":"https://example.com"}}'

# 3. Mark elements (shows [1], [2], [3] labels)
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"2","method":"markElements","params":{}}'

# 4. Take screenshot
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"3","method":"screenshot","params":{}}' | jq -r '.result.data' | base64 -d > /tmp/page.png

# 5. Click element [1]
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"4","method":"clickMark","params":{"label":1}}'

Or use the helper functions:

source ~/.openclaw/skills/atl-browser/scripts/atl-helper.sh
atl_goto "https://example.com"
atl_mark
atl_screenshot /tmp/page.png
atl_click 1

Quick Reference

Base URL: http://localhost:9222

Common Commands

# Check if ATL is running
curl -s http://localhost:9222/ping

# Navigate to URL
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"1","method":"goto","params":{"url":"https://example.com"}}'

# Wait for page ready
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"2","method":"waitForReady","params":{"timeout":10}}'

# Take screenshot (returns base64 PNG)
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"3","method":"screenshot","params":{}}' | jq -r '.result.data' | base64 -d > screenshot.png

# Mark interactive elements (shows numbered labels)
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"4","method":"markElements","params":{}}'

# Click by mark label
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"5","method":"clickMark","params":{"label":3}}'

# Scroll page
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"6","method":"evaluate","params":{"script":"window.scrollBy(0, 500)"}}'

# Type text
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"7","method":"type","params":{"text":"Hello world"}}'

# Click by CSS selector
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"8","method":"click","params":{"selector":"button.submit"}}'

Setup (First Time)

1. Start Simulator

# Boot iPhone 17 simulator (or another device)
xcrun simctl boot "iPhone 17"

# Open Simulator app
open -a Simulator

2. Build & Install AtlBrowser

cd ~/Atl/core/AtlBrowser

# Build for simulator (RECOMMENDED: target by UDID)
# Why: name-based destinations can cause Xcode to pick an older iOS runtime (15/16)
# and fail if AtlBrowser has an iOS 17+ deployment target.
#
# 1) Find a suitable simulator UDID (iOS 17+):
#   xcrun simctl list devices available
#
# 2) Build targeting that UDID:
xcodebuild -workspace AtlBrowser.xcworkspace \
  -scheme AtlBrowser \
  -destination 'id=<SIM_UDID>' \
  -derivedDataPath /tmp/atl-dd \
  build

# Install to a specific simulator (preferred)
xcrun simctl install <SIM_UDID> \
  /tmp/atl-dd/Build/Products/Debug-iphonesimulator/AtlBrowser.app

# Launch the app
xcrun simctl launch <SIM_UDID> com.atl.browser

3. Verify Server

curl -s http://localhost:9222/ping
# Should return: {"status":"ok"}

All Available Methods

App Control (Native Mode)

Method	Params	Mode	Description
openApp	{bundleId}	Any→Native	Open app, switch to native mode
closeApp	-	Native	Close current app, return to browser mode
appState	-	Any	Get current mode and bundleId
openBrowser	-	Native→Browser	Switch back to browser mode

Native Accessibility

Method	Params	Mode	Description
snapshot	{interactiveOnly?, maxDepth?}	Native	Get accessibility tree
tapRef	{ref}	Native	Tap element by ref (e.g., "e0")
find	{text, action, value?, by?}	Native	Find element and interact
fillRef	{ref, text}	Native	Tap element and type text
focusRef	{ref}	Native	Focus element without typing

Navigation (Browser)

Method	Params	Mode	Description
goto	{url}	Browser	Navigate to URL
reload	-	Browser	Reload page
goBack	-	Browser	Go back
goForward	-	Browser	Go forward
getURL	-	Browser	Get current URL
getTitle	-	Browser	Get page title

Interactions (Browser)

Method	Params	Mode	Description
click	{selector}	Browser	Click element
doubleClick	{selector}	Browser	Double-click
type	{text}	Both	Type text
fill	{selector, value}	Browser	Fill input field
press	{key}	Both	Press key
hover	{selector}	Browser	Hover over element
scrollIntoView	{selector}	Browser	Scroll to element

Mark System (Browser)

Method	Params	Mode	Description
markElements	-	Browser	Mark visible interactive elements
markAll	-	Browser	Mark ALL interactive elements
unmarkElements	-	Browser	Remove marks
clickMark	{label}	Browser	Click by label number
getMarkInfo	{label}	Browser	Get element info by label

Screenshots & Capture

Method	Params	Mode	Description
screenshot	{fullPage?, selector?}	Both	Take screenshot
captureForVision	{savePath?, name?}	Browser	Full page PDF
captureJPEG	{quality?, fullPage?}	Both	JPEG capture
captureLight	-	Browser	Text + interactives only

Waiting (Browser)

Method	Params	Mode	Description
waitForSelector	{selector, timeout?}	Browser	Wait for element
waitForNavigation	-	Browser	Wait for navigation
waitForReady	{timeout?, stabilityMs?}	Browser	Wait for page ready
waitForAny	{selectors, timeout?}	Browser	Wait for any selector

JavaScript (Browser)

Method	Params	Mode	Description
evaluate	{script}	Browser	Run JavaScript
querySelector	{selector}	Browser	Find element
querySelectorAll	{selector}	Browser	Find all elements
getDOMSnapshot	-	Browser	Get page HTML

Cookies (Browser)

Method	Params	Mode	Description
getCookies	-	Browser	Get all cookies
setCookies	{cookies}	Browser	Set cookies
deleteCookies	-	Browser	Delete all cookies

Touch Gestures (Both Modes)

Method	Params	Mode	Description
tap	{x, y}	Both	Tap at coordinates
longPress	{x, y, duration?}	Both	Long press (default 0.5s)
swipe	{direction}	Both	Swipe up/down/left/right
swipe	{fromX, fromY, toX, toY}	Both	Swipe between points
pinch	{scale, duration?}	Both	Pinch zoom (scale > 1 = zoom in)

Swipe Examples

# Swipe up (scroll down)
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"1","method":"swipe","params":{"direction":"up"}}'

# Swipe left (next page in carousel)
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"2","method":"swipe","params":{"direction":"left","distance":400}}'

# Custom swipe path
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"3","method":"swipe","params":{"fromX":200,"fromY":600,"toX":200,"toY":200}}'

# Long press for context menu
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"4","method":"longPress","params":{"x":150,"y":300,"duration":1.0}}'

# Pinch to zoom in
curl -s -X POST http://localhost:9222/command \
  -d '{"id":"5","method":"pinch","params":{"scale":2.0}}'

Typical Workflow

# 1. Navigate to site
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"1","method":"goto","params":{"url":"https://www.apple.com/shop"}}'

# 2. Wait for page to load
sleep 2
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"2","method":"waitForReady","params":{"timeout":10}}'

# 3. Mark elements to see what's clickable
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"3","method":"markElements","params":{}}'

# 4. Take screenshot to see the marks
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"4","method":"screenshot","params":{}}' | jq -r '.result.data' | base64 -d > /tmp/page.png

# 5. Click a marked element (e.g., label 14)
curl -s -X POST http://localhost:9222/command \
  -H "Content-Type: application/json" \
  -d '{"id":"5","method":"clickMark","params":{"label":14}}'

# 6. Repeat as needed

Troubleshooting

Navigation not working (goto returns success but page doesn't change)

Known issue: goto command may return success without navigating. Use JS workaround:

# Instead of goto, use evaluate to navigate
curl -s -X POST http://localhost:9222/command -H "Content-Type: application/json" \
  -d '{"id":"1","method":"evaluate","params":{"script":"location.href = \"https://example.com\"; true"}}'

# Wait for page load
sleep 3
curl -s -X POST http://localhost:9222/command -H "Content-Type: application/json" \
  -d '{"id":"2","method":"waitForReady","params":{"timeout":10}}'

Server not responding

# Check if app is running
xcrun simctl listapps booted | grep atl

# Restart the app
xcrun simctl terminate booted com.atl.browser
xcrun simctl launch booted com.atl.browser

# Check logs
xcrun simctl spawn booted log show --predicate 'process == "AtlBrowser"' --last 1m

Need to rebuild (iOS version changes)

cd ~/Atl/core/AtlBrowser
xcodebuild -workspace AtlBrowser.xcworkspace -scheme AtlBrowser -sdk iphonesimulator build
xcrun simctl install booted ~/Library/Developer/Xcode/DerivedData/AtlBrowser-*/Build/Products/Debug-iphonesimulator/AtlBrowser.app
xcrun simctl launch booted com.atl.browser

Port 9222 in use

The ATL server runs inside the simulator app. If port 9222 is blocked, check for other processes:

lsof -i :9222

Best Practices

1. Clean UI Before Acting

Real users dismiss popups. You should too.

# Before any workflow, check for and dismiss:
# - Cookie consent banners
# - Newsletter popups  
# - Health/privacy consent modals
# - "Download our app" prompts
atl_mark
for KEYWORD in "close" "dismiss" "no thanks" "accept" "got it" "continue"; do
  LABEL=$(atl_find "$KEYWORD")
  [ -n "$LABEL" ] && atl_click $LABEL && sleep 1
done

2. Verify State After Actions

Don't assume — confirm.

atl_click $ADD_TO_CART
sleep 2
# Check if cart updated
CART=$(atl_find "cart [1-9]")
if [ -z "$CART" ]; then
  # Didn't work - take screenshot to see why
  atl_screenshot /tmp/debug.png
  echo "Action may have opened a modal - check screenshot"
fi

3. Use Viewport Coordinates for Taps

Marks give page-relative coordinates. For tap to work, the element must be visible.

# Option A: Scroll element into view first
curl -s -X POST http://localhost:9222/command -H "Content-Type: application/json" \
  -d '{"id":"1","method":"evaluate","params":{"script":"document.querySelector(\"#my-button\").scrollIntoView()"}}'

# Option B: Get viewport-relative coords via JS
curl -s -X POST http://localhost:9222/command -H "Content-Type: application/json" \
  -d '{"id":"2","method":"evaluate","params":{"script":"var r = document.querySelector(\"#my-button\").getBoundingClientRect(); JSON.stringify({x: r.x + r.width/2, y: r.y + r.height/2})"}}'

4. Screenshot is Your Debugging Superpower

When in doubt, look.

atl_screenshot /tmp/current-state.png
# Then analyze with vision or just open the file

Notes

• ATL runs inside the iOS Simulator, sharing the host's network
• Port 9222 is the default (matches Chrome DevTools Protocol convention)
• The mark system shows red numbered labels on interactive elements
• Screenshots are PNG base64-encoded; use base64 -d to decode
• iOS 26+ compatible (fixed NWListener binding issue)

Requirements

• macOS with Xcode installed
• iOS Simulator (comes with Xcode)
• That's it!

Examples

See examples/ folder:

• test-browse.sh - Quick bash test workflow

API Reference

For machine-readable API spec, see openapi.yaml — includes all commands, parameters, and response schemas.

Source

• GitHub: https://github.com/JordanCoin/Atl
• Author: @JordanCoin