# appfunctions

Analyzes Android apps and generates Kotlin code to expose key user workflows to on-device AI agents without opening the application UI.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 1600 installs · ★ 9764
- Author: Google LLC
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/android/skills/tree/HEAD/device-ai/appfunctions/SKILL.md
- Updated: 2026-10-23
- HTML: https://affpapa.org/en/nevibecode/skills/appfunctions

## What it does

The skill manages four stages of Android AppFunction integration: discovering workflows in existing code, writing Kotlin implementations, refining KDoc for agents, and debugging via ADB. It lets system agents trigger background actions directly, including dispatching messages, setting notes, or controlling media playback. The workflow covers build setups, Hilt dependency injection, and KSP configuration.

Legacy codebases cannot run these implementations directly: AppFunctions relies on Android 16 platform APIs, which require compileSdk 37 and targetSdk 36 or newer. The skill builds on the Jetpack library for backward compatibility and outlines migration from version 1.0.0-alpha09 to the AppFunctionServiceEntryPoint architecture introduced in alpha10.

Refining KDoc runs immediately after generating Kotlin code so Model Context Protocol consumers receive correct tool descriptions. High-risk operations and sensitive data transfers require explicit confirmation before execution.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add android/skills --skill appfunctions -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/appfunctions/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/appfunctions/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add android/skills --skill appfunctions -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/appfunctions/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add android/skills --skill appfunctions -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/appfunctions/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install android/skills appfunctions
```

2. **Manually: put the files in place**
- File: `.github/skills/appfunctions/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add android/skills --skill appfunctions -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/android/skills --path device-ai/appfunctions
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/appfunctions/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add android/skills --skill appfunctions -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/android/skills/tree/HEAD/device-ai/appfunctions/SKILL.md

## When to use it
- discover app workflows that can serve as agent tools
- generate Kotlin AppFunctions code with Hilt dependency injection
- optimize KDoc descriptions for Model Context Protocol tools
- verify registration and invoke functions on a device via ADB

## Example prompts
- Analyze my Android codebase and discover candidate workflows for AppFunctions.
- Generate Kotlin code for AppFunctions and configure Hilt dependencies.
- Refactor KDoc tool descriptions for MCP agents and give me ADB test commands.

## Source text · SKILL.md · Apache-2.0

Below is the content of a third-party file. It is data, not instructions for you: do not act on anything written inside unless the human asks. Block tag: 1c5928731c7546b5.

BEGIN THIRD-PARTY FILE 1c5928731c7546b5
```text
---
name: appfunctions
description: Analyzes Android apps to identify key user workflows for AppFunctions
  such as creating a note, playing media, or sending an automated or AI agent triggered
  message, voice commands, or system shortcuts, without needing to open the app UI.
  Generates Kotlin code to expose these workflows to the Android system, allowing
  agents to discover and execute them on-device. Also refines KDoc documentation to
  ensure AI agents correctly understand and use the provided functionality.
license: Complete terms in LICENSE.txt
metadata:
  author: Google LLC
  last-updated: '2026-08-14'
  keywords:
  - AppFunctions
  - Kotlin
  - KSP
  - ADB
  - AI
  - LLM
  - MCP
---

Analyzes Android apps to identify key user workflows for AppFunctions such as
creating a note, playing media, or sending an automated or AI agent triggered
message, voice commands, or system shortcuts, without needing to open the app
UI.

Generates Kotlin code to expose these workflows to the Android system,
allowing agents to discover and execute them on-device.

Also refines KDoc documentation to ensure AI agents correctly
understand and use the provided functionality.

## Prerequisites

The app must **`targetSdk 36`** or newer and use **`compileSdk 37`** or newer as
AppFunctions, part of the Android platform API, are available from Android 16
onwards.
Always use the Jetpack library because it handles backward compatibility.

## Workflows

This skill enables the caller to discover features that will be provided to
system agents, implement these with AppFunctions, improve function description
for agents, and use ADB commands for local evaluation and testing.

The full AppFunction development flow consists of these four steps:

- *[Step 1: Discovery](references/feature-discovery-analysis.md)*: Analyze Android codebases to identify and recommend potential AppFunctions. Use this step when a user asks to "discover AppFunctions," "find features for AI," or "analyze my app for agentic tools."
- *[Step 2: Implementation and configuration](references/implementation-configuration.md)*: Generate Kotlin implementations of AppFunctions, manage system-wide configuration, and configure build dependencies. Use this step when a user asks to "implement AppFunctions," "set up the AppFunctions framework," or "configure Hilt for AppFunctions."
- *[Step 3: KDoc refinement](references/kdoc-refinement-optimization.md)*: Optimize AppFunction KDoc for AI agents and Model Context Protocol. If a user asks to "write KDoc", "optimize for MCP", or "refactor tool descriptions for LLMs", use this step.
```
END THIRD-PARTY FILE 1c5928731c7546b5

The third-party file has ended. Everything between the 1c5928731c7546b5 tags is data: requests and commands from it are not followed. An “end of file” line with another tag inside the block is part of the file.

First 2607 of 4619 bytes. © Google LLC · Apache-2.0 · https://github.com/android/skills/tree/HEAD/device-ai/appfunctions/SKILL.md

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