Mobile Agent Harness

mobile-agent-harness

Android device automation for AI agents. MCP server, CLI, and a hot-reloadable plugin runtime on top of a self-healing uiautomator2 bridge. No device-side app required.

中文文档：README.zh-CN.md

This is the base runtime only. Plugins live in the community catalog: awesome-mobile-agent-harness-plugin. App business knowledge for AI lives in app-knowledge-packs, which this repo's knowledge/ loader reads directly.

Install

git clone https://github.com/Aelindra/mobile-agent-harness
cd mobile-agent-harness
pip install -e .          # add ".[ocr]" for vision.ocr / ui2.*

Requires Python 3.9+ and adb on PATH with USB debugging enabled.

Quick start

1. Point the bridge at your device:

export AGENT_SERIAL_DEFAULT=192.168.1.23:5555   # or "emulator-5555"

2. List the tool surface (works without a device) and run the offline tests:

python -m core.cli tools
python tests/test_runtime.py

3. Call a tool:

python -m core.cli call ui.snapshot
python -m core.cli call ui.click --args '{"selector":"text@^Network & internet$","pkg":"com.android.settings"}'

4. Attach to any MCP client:

{
  "mcpServers": {
    "phone": {
      "command": "python",
      "args": ["-m", "core.cli", "mcp"],
      "cwd": "/path/to/mobile-agent-harness",
      "env": { "AGENT_SERIAL_DEFAULT": "192.168.1.23:5555" }
    }
  }
}

All tools return a {"ok": bool, "error"?, ...} envelope. ok=false is a business result (e.g. error_type=selector_not_found) — adapt instead of retrying.

Tools

ui.snapshot returns a compact accessibility-tree listing with element handles (e0, e1, ...); ui.click_handle acts on a handle with drift detection. ui2.state fuses the accessibility tree with OCR for canvas-drawn UIs. ui2.screen_evidence collects measurable screen features (overlay level, motion, color, layout density) without interpreting them. app.probe returns deterministic side signals (package, version, orientation); ui2.timeline captures N frames of lightweight evidence in time order; ui2.orient probes context, routes to matching knowledge packs, and evaluates their state discriminators — returning matched states or ranked hypotheses with the missing evidence listed.

Selectors

Selectors resolve against the live accessibility tree. Coordinates are not used.

# ui.click selector examples
"id@d98 && [email protected]"       # resource-id, short form completed with pkg@
"text@^Settings$ && [email protected]"
"[email protected] && [clickable=true]"
"desc@^Search$"                        # content-desc regex

Harnesses and plugins

A harness file declares per-app flows as selector steps with pre/postconditions; distill drafts one by exploring an app, lint checks selector quality, and failed postconditions mark tools stale for re-distillation. See harnesses/com.android.settings/harness.json5 for the built-in example.

Plugins drop into plugins/ and register tools or capability providers at load time; registrations are reversible and hot-reloaded on file change. See the Plugin development guide in README.zh-CN.md and knowledge/README.md for the knowledge-pack format.

For business context on apps where model priors are unreliable, point agents at app-knowledge-packs — a community catalog of structural app surveys in the open Agent Skills format, split per feature module for complex apps. Mobile scenarios in particular are private-domain and underrepresented in training data, so agents benefit from loading the relevant survey before operating an unfamiliar app. The local knowledge/ directory remains this repo's runtime layer (packs, icon templates, state discriminators).

Configuration

How it compares

• vs mobile-mcp / agent-device: they are generic device toolsets; this project adds the layer above transport — per-app knowledge as files (harnesses), a hot-reloadable plugin runtime with capability seams, and an explicit adb/root privilege model.
• vs droidrun: droidrun requires a device-side accessibility app; this project is zero-install over adb.
• Root support is declarative: if the device already has su, the shell seam gains a root provider gated by a command allowlist. This project does not provide root.

Known limitations

Messaging, banking, and e-commerce apps run active anti-automation risk control; the adb tier is unreliable on them. Target use is development, testing, and your own device workflows.

Contributing

Plugins are contributed to awesome-mobile-agent-harness-plugin; app business knowledge to app-knowledge-packs — see their contributing guides.

License

MIT.