Android Hidden API and R8 Check
gkd-kit/gkd
Checks whether Android hidden-API implementations and system callbacks survive R8 minification, and diagnoses Release-only failures such as AbstractMethodError.
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…
Install Appfunctions
$ npx skills add arindamxd/camerax-android --skill appfunctions -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install arindamxd/camerax-android appfunctions --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/appfunctions .claude/skills/appfunctions && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .claude/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctionsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add arindamxd/camerax-android --skill appfunctions -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install arindamxd/camerax-android appfunctions --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/appfunctions .agents/skills/appfunctions && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .agents/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add arindamxd/camerax-android --skill appfunctions -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install arindamxd/camerax-android appfunctions --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/appfunctions .cursor/skills/appfunctions && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .cursor/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/arindamxd/camerax-android.git --path .agents/skills/appfunctions--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add arindamxd/camerax-android --skill appfunctions -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install arindamxd/camerax-android appfunctions --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/appfunctions .gemini/skills/appfunctions && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .gemini/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install arindamxd/camerax-android appfunctionsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add arindamxd/camerax-android --skill appfunctions -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/appfunctions .github/skills/appfunctions && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .github/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add arindamxd/camerax-android --skill appfunctions -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install arindamxd/camerax-android appfunctions --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/arindamxd/camerax-android.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/appfunctions .opencode/skills/appfunctions && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "appfunctions" agent skill from https://github.com/arindamxd/camerax-android/tree/master/.agents/skills/appfunctions into .opencode/skills/appfunctions/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "appfunctions", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
appfunctions- GitHub stars
- 132
- Used in
- 4 other repos
- Token cost
- ~1.2k tokens
- SKILL.md length
- 486 words
- Files
- 7 (incl. references)
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
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…
- Tasks that involve Android development
- SKILL.md covers Prerequisites, Workflows, Critical constraints and Troubleshooting
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Appfunctions is an agent skill from arindamxd/camerax-android. 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.
Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `references/adb-interaction-testing.md`, `references/context.md` and `references/feature-discovery-analysis.md`).
It sits in Mobile, covering Android development. It works with Android and Kotlin. The repository describes itself as: A Play Store camera app showing Jetpack CameraX APIs in Kotlin — install it, use it, copy the patterns. The licence is Apache-2.0.
When your agent uses it
- Tasks that involve Android development
Example prompts
- “Use the appfunctions skill to analyz Android apps to identify key user workflows for AppFunctions such as creating a note, playing media, or sending…”
- “/appfunctions”
What it can do on your machine
Read from SKILL.md and the folder at commit 7c36352. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Appfunctions loads about 1.2k tokens when it runs, and up to ~8.8k if it reads all its reference files. Until then it costs about 122 tokens; SKILL.md has 486 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from arindamxd/camerax-android at commit 7c36352, republished under its Apache-2.0 licence (© arindamxd). 486 words, ~1,155 tokens.
Download SKILL.mdSave it as
.claude/skills/appfunctions/SKILL.md (or your agent's skills folder). This skill also uses 6 other files; get the full folder from GitHub.- 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
- metadata.last-updated
- 2026-08-06
- metadata.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: 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: 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: 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.
- Step 4: Testing and debugging: Provide commands to interact with AppFunctions using ADB for testing and debugging. If a user wants to "list app functions", "invoke an app function", or "verify app function registration" on a device, use this step.
Show full SKILL.md (189 more words)Show less
If users request a subset of steps, you must encourage them to use all steps.
If they apply, you must load the following references:
- Context and terminology: Defines the ubiquitous language, architecture definitions, and design patterns across the AppFunctions skill suite. Load when you need to understand core architecture terminology or check the distinctions between modern and legacy AppFunctions APIs.
- Migration to service entry point : Documents the systematic procedure for migrating Android applications using AppFunctions versions 1.0.0-alpha09 and lower to
AppFunctionServiceEntryPointarchitecture introduced in version 1.0.0-alpha10. Load when a user asks to migrate or upgrade existing AppFunctions code, or when you encounter legacyAppFunctionConfiguration.Providerimplementations.
Critical constraints
- Modular consistency: You must refine KDocs immediately after you generate AppFunction implementations.
- Security: Don't expose sensitive data or run destructive actions without user confirmation.
Troubleshooting
- If you encounter build-time errors such as Kotlin Symbol Processing (KSP) issues, see Implementation and configuration.
- If you encounter runtime errors such as missing services or execution failures, see Testing and debugging.
- If you need architecture definitions and vocabulary, see Context and terminology.
- If you encounter issues when upgrading legacy configurations, see Migration to service entry point.
© arindamxd, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
SKILL.md and 6 other files (references) in .agents/skills/appfunctions of arindamxd/camerax-android.
- SKILL.md
- references/adb-interaction-testing.md
- references/context.md
- references/feature-discovery-analysis.md
- references/implementation-configuration.md
- references/kdoc-refinement-optimization.md
- references/migrate-to-service-entry-point.md
Open the folder on GitHubat commit 7c36352
Used in 4 other repositories
We found 6 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 4 other GitHub owners. This page covers the copy in arindamxd/camerax-android, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Appfunctions next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Appfunctions this skillarindamxd/camerax-android | 132 | 4 repos | ~1.2k | Automated safety check: Pass | Apache-2.0 | |
| Android Hidden API and R8 Checkgkd-kit/gkd | 43k | — | ~1.5k | Automated safety check: Pass | GPL-3.0 | |
| Compose Multiplatform Patternsmonta-app/ocpp-emulator | 179 | 5 repos | ~2k | Automated safety check: Pass | Apache-2.0 | |
| Android Developmentdpconde/claude-android-skill | 336 | — | ~1.7k | Automated safety check: Pass | MIT | |
| Architecture Overclocknekomangaorg/Neko | 2.8k | — | ~1.4k | Automated safety check: Pass | Apache-2.0 | |
| Claude Android NinjaDrjacky/claude-android-ninja | 124 | — | ~5.2k | Automated safety check: Pass | Apache-2.0 |
Similar skills
Compose Multiplatform Patterns
monta-app/ocpp-emulator
Compose Multiplatform and Jetpack Compose patterns for KMP projects — state management, navigation, theming, performance, and platform-specific UI.
Android Development
dpconde/claude-android-skill
Create production-quality Android applications following Google's official architecture guidance and NowInAndroid best practices.
Architecture Overclock
nekomangaorg/Neko
Resolves deep, structural performance bottlenecks in the Kotlin Android codebase.
Claude Android Ninja
Drjacky/claude-android-ninja
Build and migrate Android apps with Kotlin, Jetpack Compose, MVVM, Hilt, Room 3 (KSP, SQLiteDriver, Flow/suspend DAOs), Navigation3, and multi-module Gradle.
Expo Brownfield Integration
mweinbach/agent-coworker
Helps add Expo and React Native to an existing native iOS or Android app, and choose between a prebuilt AAR or XCFramework and a fully integrated build.
More from arindamxd/camerax-android
All 21 skills in this repoStyles
arindamxd/camerax-android
A skill your agent uses to integrate the Jetpack Compose Styles API into an Android project.
Verified Email
arindamxd/camerax-android
Provides a complete workflow for implementing verified email retrieval on Android Credential Manager API.
Edge To Edge
arindamxd/camerax-android
A skill your agent uses to migrate your Jetpack Compose app to add adaptive edge-to-edge support and troubleshoot common issues.
Camerax
arindamxd/camerax-android
Provide technical guidance for Android camera development with CameraX.
Leanback To Compose Tv Migration
arindamxd/camerax-android
Provides instructions and architectural patterns for migrating Android TV applications from legacy Leanback UI Toolkit, Android Views, or Support Fragments to Jetpack Compose for TV (androidx.tv).
Migrate XML Views To Jetpack Compose
arindamxd/camerax-android
Provides a structured workflow for migrating an Android XML View to Jetpack Compose.
Related
Categories
Questions about Appfunctions
What does Appfunctions do?
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…. Appfunctions is an agent skill from arindamxd/camerax-android. 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.
When should I use Appfunctions?
Appfunctions fits situations like: tasks that involve Android development.
How do I install Appfunctions in Claude Code?
Run `npx skills add arindamxd/camerax-android --skill appfunctions -a claude-code`. Or copy the skill folder (.agents/skills/appfunctions in arindamxd/camerax-android) into .claude/skills/appfunctions in your project. Claude Code loads it when a task matches its description.
How do I install Appfunctions in Codex?
Run `npx skills add arindamxd/camerax-android --skill appfunctions -a codex`. Or copy the skill folder (.agents/skills/appfunctions in arindamxd/camerax-android) into .agents/skills/appfunctions in your project. Codex loads it when a task matches its description.
Can I use Appfunctions in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add arindamxd/camerax-android --skill appfunctions -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/appfunctions, .gemini/skills/appfunctions, .github/skills/appfunctions and .opencode/skills/appfunctions in your project.
What does Appfunctions need to run?
SKILL.md names no scripts, command-line tools or credentials: Appfunctions is instructions for the agent only.
Does Appfunctions access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Appfunctions safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Appfunctions use?
Appfunctions is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Appfunctions use?
About 1.2k tokens (SKILL.md is roughly 4.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 7.7k tokens, read only when the agent opens those files.
What are the alternatives to Appfunctions?
Skills that share tags, products or a category with Appfunctions: Android Hidden API and R8 Check (gkd-kit/gkd, 43k stars), Compose Multiplatform Patterns (monta-app/ocpp-emulator, 179 stars), Android Development (dpconde/claude-android-skill, 336 stars) and Architecture Overclock (nekomangaorg/Neko, 2.8k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Appfunctions?
arindamxd (a GitHub user) maintains it in arindamxd/camerax-android, which has 132 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 2, 2026.
Source: arindamxd/camerax-android on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.