AGENT DESKTOP

OBSERVE. DECIDE. ACT.

agent-desktop is a native desktop automation CLI designed for AI agents, built with Rust. It gives structured access to any application through OS accessibility trees — no screenshots, no pixel matching, no browser required.

Architecture

Key Features

• Native Rust CLI: Fast, single binary, no runtime dependencies
• C-ABI cdylib (libagent_desktop_ffi): Load once from Python / Swift / Go / Ruby / Node / C instead of forking the CLI per call
• 53 commands: Observation, interaction, keyboard, mouse, notifications, clipboard, window management
• Progressive skeleton traversal: 78–96% token reduction on dense apps via shallow overview + targeted drill-down
• Snapshot & refs: AI-optimized workflow using deterministic element references (@e1, @e2)
• AX-first interactions: Every action exhausts pure accessibility API strategies before falling back to mouse events
• Structured JSON output: Machine-readable responses with error codes and recovery hints
• Works with any app: Finder, Safari, System Settings, Xcode, Slack — anything with an accessibility tree

Installation

npm (recommended)

npm install -g agent-desktop        # downloads prebuilt binary automatically

Or without installing:

npx agent-desktop snapshot --app Finder -i

From source

git clone https://github.com/lahfir/agent-desktop
cd agent-desktop
cargo build --release
cp target/release/agent-desktop /usr/local/bin/

Requires Rust 1.78+ and macOS 13.0+.

Permissions

macOS requires Accessibility permission. Grant it in System Settings > Privacy & Security > Accessibility by adding your terminal app, or:

agent-desktop permissions --request   # trigger system dialog

Language bindings (FFI)

Every GitHub Release ships a prebuilt C-ABI cdylib alongside the CLI tarballs. Hosts that need in-process calls (Python agents, Swift apps, Go services, Node tools, Ruby scripts, C/C++ code) dlopen the dylib and call the functions declared in agent_desktop.h — no fork-exec per command.

Each archive contains lib/libagent_desktop_ffi.{dylib,so,dll}, include/agent_desktop.h, LICENSE, and a short README. Verify the download with the release's checksums.txt:

shasum -a 256 -c checksums.txt
gh attestation verify agent-desktop-ffi-v*.tar.gz --repo lahfir/agent-desktop   # Sigstore provenance

Minimal Python round-trip:

import ctypes
lib = ctypes.CDLL("./lib/libagent_desktop_ffi.dylib")
lib.ad_adapter_create.restype = ctypes.c_void_p
adapter = lib.ad_adapter_create()
# ... call ad_list_apps / ad_get_tree / ad_execute_action, see docs below
lib.ad_adapter_destroy(adapter)

Full consumer guide — error-handling contract, ownership rules, threading constraints, every entrypoint with Safety docs: skills/agent-desktop-ffi/.

Core Workflow for AI

For dense apps (Slack, VS Code, Notion), use progressive skeleton traversal to minimize token usage:

# 1. Shallow overview — depth-3 map, truncated containers show children_count
agent-desktop snapshot --skeleton --app Slack -i --compact

# 2. Drill into a region of interest (named containers get refs as drill targets)
agent-desktop snapshot --root @e3 -i --compact

# 3. Act on an element found in the drill-down
agent-desktop click @e12

# 4. Re-drill the same region to verify the state change
agent-desktop snapshot --root @e3 -i --compact

For simple apps, a full snapshot is fine:

agent-desktop snapshot --app Finder -i   # get interactive elements with refs
agent-desktop click @e3                  # click a button by ref
agent-desktop type @e5 "quarterly report"  # type into a text field
agent-desktop press cmd+s               # keyboard shortcut
agent-desktop snapshot -i               # re-observe after UI changes

Agent loop:  snapshot → decide → act → snapshot → decide → act → ...

Commands

Observation

agent-desktop snapshot --app Safari -i           # accessibility tree with refs
agent-desktop snapshot --surface menu            # capture open menu
agent-desktop screenshot --app Finder            # PNG screenshot
agent-desktop find --role button --app TextEdit  # search by role, name, value, text
agent-desktop get @e3 value                      # read element property
agent-desktop is @e7 checked                     # check boolean state
agent-desktop list-surfaces --app Notes          # list menus, sheets, popovers, alerts

Interaction

agent-desktop click @e3                  # smart AX-first click (15-step chain)
agent-desktop double-click @e3           # open files, select words
agent-desktop triple-click @e3           # select lines/paragraphs
agent-desktop right-click @e3            # context menu (returns menu tree inline)
agent-desktop type @e5 "hello world"     # type text into element
agent-desktop set-value @e5 "new value"  # set value directly via AX
agent-desktop clear @e5                  # clear element value
agent-desktop focus @e5                  # set keyboard focus
agent-desktop select @e9 "Option B"      # select option in dropdown/list
agent-desktop toggle @e12                # flip checkbox or switch
agent-desktop check @e12                 # idempotent check
agent-desktop uncheck @e12               # idempotent uncheck
agent-desktop expand @e15                # expand disclosure/tree item
agent-desktop collapse @e15              # collapse disclosure/tree item
agent-desktop scroll @e1 down 3          # scroll (AX-first, 10-step chain)
agent-desktop scroll-to @e20             # scroll element into view

Keyboard

agent-desktop press cmd+s               # key combo
agent-desktop press cmd+shift+z          # multi-modifier
agent-desktop press escape               # single key
agent-desktop key-down shift             # hold key
agent-desktop key-up shift               # release key

Mouse

agent-desktop hover @e3                  # move cursor to element
agent-desktop hover --xy 500,300         # move cursor to coordinates
agent-desktop drag @e3 --to @e8          # drag between elements
agent-desktop drag --xy 100,200 --to-xy 400,200  # drag between coordinates
agent-desktop mouse-click --xy 500,300   # click at coordinates
agent-desktop mouse-down --xy 500,300    # press at coordinates
agent-desktop mouse-up --xy 500,300      # release at coordinates

App & Window Management

agent-desktop launch Safari              # launch app by name
agent-desktop launch com.apple.Safari    # launch by bundle ID
agent-desktop close-app Safari           # quit app
agent-desktop close-app Safari --force   # force quit (SIGKILL)
agent-desktop list-apps                  # list running GUI apps
agent-desktop list-windows               # list visible windows
agent-desktop list-windows --app Finder  # windows for specific app
agent-desktop focus-window w-4521        # bring window to front
agent-desktop resize-window w-4521 800 600  # resize
agent-desktop move-window w-4521 100 100    # move
agent-desktop minimize w-4521            # minimize
agent-desktop maximize w-4521            # maximize
agent-desktop restore w-4521             # restore

Notifications (macOS only)

agent-desktop list-notifications                       # list all notifications
agent-desktop list-notifications --app "Slack"         # filter by app
agent-desktop list-notifications --text "deploy" --limit 5  # filter by text
agent-desktop dismiss-notification 1                   # dismiss by index
agent-desktop dismiss-all-notifications                # dismiss all
agent-desktop dismiss-all-notifications --app "Slack"  # dismiss all from app
agent-desktop notification-action 1 --action "Reply"   # click action button

Clipboard

agent-desktop clipboard-get              # read clipboard text
agent-desktop clipboard-set "copied"     # write to clipboard
agent-desktop clipboard-clear            # clear clipboard

Wait

agent-desktop wait 500                                       # sleep 500ms
agent-desktop wait --element @e3 --timeout 5000              # wait for element
agent-desktop wait --window "Save" --timeout 10000           # wait for window
agent-desktop wait --text "Loading complete" --app Safari    # wait for text
agent-desktop wait --menu --timeout 3000                     # wait for menu

Batch

agent-desktop batch '[
  {"command": "click", "args": {"ref_id": "@e2"}},
  {"command": "type", "args": {"ref_id": "@e5", "text": "hello"}},
  {"command": "press", "args": {"combo": "return"}}
]' --stop-on-error

System

agent-desktop status                     # platform, permission state
agent-desktop permissions                # check accessibility permission
agent-desktop permissions --request      # trigger system dialog
agent-desktop version                    # version string

Snapshot Options

agent-desktop snapshot [OPTIONS]

JSON Output

Every command returns structured JSON:

{
  "version": "1.0",
  "ok": true,
  "command": "click",
  "data": { "action": "click" }
}

Errors include machine-readable codes and recovery hints:

{
  "version": "1.0",
  "ok": false,
  "command": "click",
  "error": {
    "code": "STALE_REF",
    "message": "Element at @e7 no longer matches the last snapshot",
    "suggestion": "Run 'snapshot' to refresh refs, then retry"
  }
}

Error Codes

Exit Codes

0 success, 1 structured error (JSON on stdout), 2 argument parse error.

Ref System

snapshot assigns refs to interactive elements in depth-first order: @e1, @e2, @e3, etc. Refs are valid until the next snapshot replaces them.

Interactive roles that receive refs: button, textfield, checkbox, link, menuitem, tab, slider, combobox, treeitem, cell, radiobutton, incrementor, menubutton, switch, colorwell, dockitem.

Static elements (labels, groups, containers) appear in the tree for context but have no ref.

Stale ref recovery:

snapshot → act → STALE_REF? → snapshot again → retry

Platform Support

Development

cargo build                               # debug build
cargo build --release                     # optimized (<15MB)
cargo test --lib --workspace              # run tests
cargo clippy --all-targets -- -D warnings # lint (must pass with zero warnings)

License

Apache-2.0