xcmcp (Xcode & macOS Automation)

Drive macOS apps the way a human does — through the Accessibility API, from an MCP client.

axmcp is a macOS automation toolkit built around three MCP servers and matching CLIs. It lets an LLM (or a shell script) inspect and operate native apps, Xcode projects, and iOS simulators with the same primitives Apple's own assistive technologies use.

Server	What it drives	Shape
cmd/axmcp	Any running macOS app via AX tree, OCR, pointer, keyboard, windows	Open primitive surface
cmd/xcmcp	Xcode, simulators, physical devices, previews, App Store Connect	Toolset-gated, ~40 tools on demand
cmd/computer-use-mcp	Codex Computer Use contract on top of axmcp primitives	Exactly the 9-tool spec, session-stateful

If you want an LLM to click through a real app: axmcp. If you want it to build, test, boot a simulator, or add an Xcode target via the File > New UI: xcmcp. If you need a drop-in for the Codex Computer Use tool contract: computer-use-mcp.

Why this exists

• Accessibility-first, not screenshot-first. Pointer actions target AX elements by role and title, so an LLM can say "click the Build button" and get the actual button — not the pixel that looked right a moment ago.
• OCR and screenshots are the fallback, not the plan. ax_ocr, ax_ocr_diff, and ax_ocr_click exist for Electron apps, custom canvases, and partially inaccessible UI. They ride on top of the AX flow, not around it.
• Xcode, fully drivable. See the Xcode automation section below — from xcodebuild wrappers and simulator control all the way up to driving the File > New > Target wizard through the live UI when xcodebuild can't do the job.
• One repo, three audiences. The primitive surface (axmcp) is for open exploration; the Codex contract (computer-use-mcp) is for drop-in replacement; the Xcode surface (xcmcp) is the IDE-adjacent tool belt. They share one set of internal packages so behavior stays consistent.

Xcode automation, top to bottom

xcmcp and its CLI twin xc cover the whole Apple-developer loop, not just xcodebuild calls. Across its toolsets it speaks to:

• Projects and schemes — discover_projects, list_schemes, show_build_settings read .xcodeproj / .xcworkspace directly.
• Build and test — build and test wrap xcodebuild with structured output and GetTestList / RunSomeTests for targeted runs; GetBuildLog returns the last run's log for triage.
• Simulators — list_simulators, boot_simulator, shutdown_simulator, plus the simulator_extras toolset for open_url, add_media, app containers, orientation, appearance, location, privacy toggles, and screen recording.
• Physical devices — physical_device toolset for inspection and app lifecycle over devicectl.
• App lifecycle — install, uninstall, launch, terminate, logs, list_apps, running_apps across sim and device.
• IDE bridge. The always-on Xcode bridge toolset exposes Xcode's own IDE-side helpers — XcodeRead, XcodeWrite, XcodeUpdate, XcodeGlob, XcodeGrep, XcodeLS, XcodeMV, XcodeRM, XcodeMakeDir, XcodeListNavigatorIssues, XcodeRefreshCodeIssuesInFile, XcodeListWindows, ExecuteSnippet, DocumentationSearch — so any MCP client (Cursor, Zed, Windsurf, Aider, etc.) can read project files with the IDE's own picture of the workspace, list Navigator issues, refresh diagnostics on save, and run snippets in Xcode's context.
• Preview rendering from any agent. RenderPreview and render_all_previews return real SwiftUI preview renders, so an agent editing views can close the visual loop without a human opening Xcode to check the canvas. Pair with XcodeListNavigatorIssues and XcodeRefreshCodeIssuesInFile and the edit → render → compile-check loop runs end-to-end over MCP.
• File > New > Target, automated. The headline: xcode_add_target drives the target-creation sheet end-to-end over AX — platform tab, template picker, product name, team, bundle ID, and the "Embed in Application" popup for extensions — then re-reads the project on disk to verify the new target/scheme actually landed. The wizard logic lives in internal/xcodewizard and is shared by both the MCP tool and xc xcode add-target.
• Code signing and shipping — the asc toolset wraps App Store Connect and altool for authentication key management, app record queries, build uploads, and TestFlight handoff.
• Crash reports and SPM — crash toolset lists and reads .ips reports; dependency toolset covers Swift Package Manager operations.

Everything is toolset-gated, so you only load what you need:

xcmcp --enable-all           # every toolset on
xcmcp --enable-ui-tools      # just UI automation of the sim
xcmcp --enable-asc-tools     # App Store Connect + altool

Or turn toolsets on and off dynamically inside a session via list_toolsets and enable_toolset.

Requirements

• macOS with Xcode installed.
• Command Line Tools available through xcrun.
• Go 1.26 or newer to build from source.
• Accessibility permission for commands that drive the UI: axmcp, ax, xcmcp, xc, computer-use-mcp.
• A booted simulator or connected device for simulator and device workflows.

Setup

Follow these steps in order. Every command is safe to run unattended.

1. Install the binaries

From a clone of this repo:

go install ./cmd/axmcp ./cmd/xcmcp ./cmd/computer-use-mcp ./cmd/ax ./cmd/xc ./cmd/ascript ./cmd/ascriptmcp

Or directly from the module path without cloning:

go install github.com/tmc/axmcp/cmd/axmcp@latest
go install github.com/tmc/axmcp/cmd/xcmcp@latest
go install github.com/tmc/axmcp/cmd/computer-use-mcp@latest
go install github.com/tmc/axmcp/cmd/ax@latest
go install github.com/tmc/axmcp/cmd/xc@latest

go install writes to $(go env GOPATH)/bin (default $HOME/go/bin), or $(go env GOBIN) if set.

2. Put the install directory on PATH

export PATH="$(go env GOPATH)/bin:$PATH"

Add that line to your shell rc if you want it permanent. Verify:

command -v axmcp xcmcp computer-use-mcp xc ax

Five absolute paths should print. If any are missing, step 1 failed for that binary.

3. Note the absolute binary paths for your MCP client

echo "AXMCP=$(command -v axmcp)"
echo "XCMCP=$(command -v xcmcp)"
echo "COMPUTER_USE_MCP=$(command -v computer-use-mcp)"

You will paste these exact paths into your MCP client config in step 5.

4. Grant Accessibility permission

macOS refuses every pointer, keystroke, and AX tree call until the calling binary is explicitly approved in System Settings → Privacy & Security → Accessibility.

The first time any of axmcp, xcmcp, ax, xc, or computer-use-mcp issues an AX call, macOS refuses and adds the binary as an unchecked row in that pane. Open it and toggle each entry on.

If an action later no-ops silently or returns "not permitted," the entry was probably turned off again by a software update — re-check the toggle.

5. Register the servers with your MCP client

See MCP client configuration below for ready-to-paste snippets for Claude Code, Cursor, Zed, and the raw JSON schema.

6. Verify the server surfaces are reachable

Once your client has loaded the config, confirm the tools showed up. A quick sanity check outside any client:

printf '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}\n' | axmcp 2>/dev/null | head -c 400

Non-empty JSON with a "tools" array means the binary is healthy and its stdio MCP transport is wired up.

Quick Start

Drive any running app:

axmcp

Exposes ax_apps, ax_tree, ax_find, ax_focus, ax_click, ax_drag, ax_type, ax_menu, ax_set_value, ax_perform_action, ax_keystroke, ax_zoom, ax_pinch, ax_screenshot, ax_ocr, ax_ocr_diff, ax_action_screenshot, ax_ocr_action_diff, ax_ocr_click, ax_ocr_hover, plus window-scoped variants (ax_window_*).

Work with Xcode and simulators:

xcmcp

Always-on: discover_projects, list_schemes, show_build_settings, build, test, list_simulators, boot_simulator, shutdown_simulator, xcode_add_target, list_toolsets, enable_toolset. The Xcode bridge toolset (IDE-facing tools from xcrun mcpbridge) is enabled by default.

Optional toolsets are loaded on demand:

xcmcp --enable-ui-tools --enable-device-tools --enable-ios-tools

Or all at once:

xcmcp --enable-all

Drop-in Codex Computer Use contract:

computer-use-mcp

Exposes exactly list_apps, get_app_state, click, perform_secondary_action, set_value, scroll, drag, press_key, type_text. Call get_app_state once per turn, then act against element_index strings from the snapshot.

MCP client configuration

All three servers speak MCP over stdio. In every config below, replace /Users/you/go/bin/... with the absolute paths you printed in setup step 3.

Claude Code

claude mcp add axmcp /Users/you/go/bin/axmcp
claude mcp add xcmcp /Users/you/go/bin/xcmcp -- --enable-all
claude mcp add computer-use-mcp /Users/you/go/bin/computer-use-mcp

Or edit ~/.claude.json directly:

{
  "mcpServers": {
    "axmcp": { "command": "/Users/you/go/bin/axmcp" },
    "xcmcp": { "command": "/Users/you/go/bin/xcmcp", "args": ["--enable-all"] },
    "computer-use-mcp": { "command": "/Users/you/go/bin/computer-use-mcp" }
  }
}

Cursor

Edit ~/.cursor/mcp.json (same schema as above):

{
  "mcpServers": {
    "axmcp": { "command": "/Users/you/go/bin/axmcp" },
    "xcmcp": { "command": "/Users/you/go/bin/xcmcp", "args": ["--enable-all"] },
    "computer-use-mcp": { "command": "/Users/you/go/bin/computer-use-mcp" }
  }
}

Zed

Edit ~/.config/zed/settings.json:

{
  "context_servers": {
    "axmcp": { "command": { "path": "/Users/you/go/bin/axmcp", "args": [] } },
    "xcmcp": { "command": { "path": "/Users/you/go/bin/xcmcp", "args": ["--enable-all"] } },
    "computer-use-mcp": { "command": { "path": "/Users/you/go/bin/computer-use-mcp", "args": [] } }
  }
}

Any other MCP client

Point it at the absolute binary path with stdio transport. Optional arguments for xcmcp:

• --enable-all — turn every optional toolset on
• --enable-ui-tools --enable-device-tools --enable-ios-tools — pick toolsets individually
• --enable-asc-tools — App Store Connect + altool
• --wait-for-xcode=0s — skip waiting for Xcode at startup (for headless/CI use)

Within a session, list_toolsets and enable_toolset turn optional xcmcp toolsets on and off without restarting.

Commands

axmcp

axmcp is the open Accessibility surface. It targets running macOS applications directly through the Accessibility API, with OCR and screenshot fallbacks for custom-drawn or partially inaccessible UIs.

Primitive tools cover element discovery, pointer and keyboard input, window manipulation, screenshots, and OCR-driven interactions.

computer-use-mcp

computer-use-mcp is the stateful, session-oriented compatibility server. It holds the narrow Codex Computer Use tool contract on top of the same accessibility and screenshot primitives.

It is tools-only — no MCP resources, no resource templates. The tool surface is app-scoped: call get_app_state first, then pass returned element_index strings to the action tools.

xcmcp

xcmcp serves tools and resources over stdio. See the Xcode automation section above for the full surface; this section just lists the optional toolsets.

Optional toolsets:

• app: app lifecycle, install, uninstall, logs, and app listing
• ui: UI tree, tap, inspect, query, screenshot, and wait
• device: simulator orientation, privacy, location, appearance, and screenshots
• ios: direct CoreSimulator-based accessibility tree and hit-testing
• simulator_extras: open URL, add media, and app container lookup
• physical_device: connected device inspection and app lifecycle actions
• video: simulator recording
• crash: crash report listing and reading
• filesystem: file access helpers
• dependency: Swift Package Manager helpers
• asc: App Store Connect and altool helpers

xc

xc exposes the same Xcode automation as a direct CLI, so you can script loops that would otherwise need the IDE.

xc project                                   # resolve the Xcode project from cwd
xc sims list                                 # see all available simulators
xc sims boot 8A2F1C4D-...                    # boot one
xc build --scheme MyApp                      # xcodebuild wrapper
xc test --scheme MyApp                       # run the full test plan
xc app install ./build/MyApp.app             # install to booted sim
xc app launch com.example.MyApp --udid booted
xc app logs com.example.MyApp                # stream device/sim logs
xc ui tree --bundle-id com.apple.finder      # AX tree of a running app
xc ios tree --udid booted                    # direct CoreSimulator AX tree
xc screen shot ~/Desktop/sim.png             # simulator screenshot

# drive the File > New > Target wizard, end-to-end
xc xcode add-target \
    --template "Widget Extension" \
    --product MyWidget \
    --platform iOS \
    --embed-in MyApp

ax

ax is the direct CLI companion to axmcp:

ax apps
ax tree com.apple.finder
ax find com.apple.dt.Xcode --role AXButton --title Build

ascript and ascriptmcp

These commands inspect scriptable applications and run AppleScript-backed operations:

ascript list /Applications/Xcode.app
ascript classes /Applications/Finder.app
ascript script /Applications/Finder.app activate

Resources

xcmcp registers these MCP resources by default:

• xcmcp://project
• xcmcp://simulators
• xcmcp://apps
• xcmcp://apps/{bundle_id}/tree
• xcmcp://apps/{bundle_id}/logs

Internal layout

This module is command-first. Reusable helpers live under internal/ and are not intended as a public import surface.

• internal/project: discover Xcode projects, inspect schemes and build settings
• internal/xcodebuild: build and test wrappers
• internal/xcodewizard: File > New > Target wizard automation, shared by xc and xcmcp
• internal/simctl: simulator management through xcrun simctl
• internal/devicectl: physical device management
• internal/ui: macOS Accessibility access and UI screenshots
• internal/screen: screen capture helpers
• internal/ghostcursor: animated cursor overlay for demonstration and recording
• internal/computeruse: shared primitives behind computer-use-mcp (app state, input, coords, policy, session, approval, intervention)
• internal/crash: crash report listing and reading
• internal/resources: MCP resource registration
• internal/sdef: parser for AppleScript scripting definitions
• internal/altool and internal/asc: App Store Connect helpers

Environment variables

axmcp reads a small set of optional environment variables. Defaults are picked for unattended use; the tunables exist mostly for debugging and demos.

Variable	Default	Effect
AXMCP_CURSOR_GLIDE_MS	280	Duration in milliseconds the ghost cursor takes to glide to a click target. Set to 0 to teleport.
AXMCP_CURSOR_SETTLE_MS	90	Milliseconds the cursor pauses on target in its Pressed state before the click is dispatched. 0 disables the dwell.
AXMCP_CURSOR_HOLD_MS	200	Milliseconds the cursor stays visible after the click before fading. 0 disables the hold.
AXMCP_HIGHLIGHT_HUMAN	unset	When set to a truthy value, draws a visible highlight around OCR matches and click targets — useful when recording demos.
AXMCP_C_SIGNAL_BACKTRACE	unset	When set to 1, installs a C-level signal handler that prints a native backtrace on crash. Off by default to avoid interfering with Go's own crash reporter.

Notes

• This repository targets macOS. Many packages use AppKit, Accessibility, or Apple developer tools directly.
• The repository name is axmcp, but it intentionally contains axmcp, xcmcp, and computer-use-mcp. They cover different layers of the same workflow surface.
• UI automation depends on macOS Accessibility permission and on the target app being reachable through the Accessibility tree.
• Some simulator and Xcode automation features rely on private or implementation-defined behavior and are best treated as developer tooling rather than a stable public protocol.
• The supported entry points are the commands in cmd/. Internal packages may change without notice.