Agent skill

Aosp System Apps

by aospbooks in aospbooks/aosp-internal-book

AOSP Part XI — System Apps. An agent skill from aospbooks/aosp-internal-book.

Apache-2.0Auto-check passed

Install Aosp System Apps

skills CLI
$ npx skills add aospbooks/aosp-internal-book --skill aosp-system-apps -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install aospbooks/aosp-internal-book aosp-system-apps --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/aospbooks/aosp-internal-book.git skills-src && mkdir -p .claude/skills && cp -r skills-src/agents/_content/parts/system-apps .claude/skills/aosp-system-apps && rm -rf skills-src

Use ~/.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/

Facts

Skill name
aosp-system-apps
GitHub stars
139
Token cost
~320 tokens
SKILL.md length
88 words
Files
1
Skills in repo
17
Repo updated
First seen
Licence
Apache-2.0

At a glance

AOSP Part XI — System Apps. An agent skill from aospbooks/aosp-internal-book.

  • Reasoning about SystemUI (status bar
  • SKILL.md covers Chapters in this Part and When to load which chapter
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Notification shade

What it does

Aosp System Apps is an agent skill from aospbooks/aosp-internal-book. AOSP Part XI — System Apps. Use when reasoning about SystemUI (status bar, notification shade, keyguard, Quick Settings, Monet/dynamic color), Launcher3 (model loader, Recents/Overview, gesture nav, all-apps, predictions, work profile), or the Settings app (SettingsProvider, SettingsLib, search index, slice surface). Chapters 48–49.

Its SKILL.md is about 320 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: The book introduces the internal of AOSP. The licence is Apache-2.0.

When your agent uses it

  • Reasoning about SystemUI (status bar
  • Notification shade
  • Monet/dynamic color)
  • Launcher3 (model loader

Example prompts

  • “/aosp-system-apps”

What it can do on your machine

Read from SKILL.md and the folder at commit fc0b48b. 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

Aosp System Apps loads about 320 tokens when it runs. Until then it costs about 88 tokens; SKILL.md has 88 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~88
When it runs · the whole SKILL.md, loaded when a task matches
~320

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 aospbooks/aosp-internal-book at commit fc0b48b, republished under its Apache-2.0 licence (© aospbooks). 88 words, ~320 tokens.

Download SKILL.mdSave it as .claude/skills/aosp-system-apps/SKILL.md (or your agent's skills folder).
name
aosp-system-apps
description
AOSP Part XI — System Apps. Use when reasoning about SystemUI (status bar, notification shade, keyguard, Quick Settings, Monet/dynamic color), Launcher3 (model loader, Recents/Overview, gesture nav, all-apps, predictions, work profile), or the Settings app (SettingsProvider, SettingsLib, search index, slice surface). Chapters 48–49.
metadata.author
utzcoz
metadata.version
2026.06.24
metadata.last-updated
2026-10-05

AOSP Part XI — System Apps

The three privileged apps every AOSP build ships with: SystemUI, Launcher3, and Settings.

Chapters in this Part

  • 48-systemui.md — SystemUI process, status bar, notification shade, keyguard, Quick Settings, Monet/dynamic color
  • 49-launcher3.md — Launcher3, model loader, Recents/Overview, gesture nav, all-apps, predictions, work profile
  • 50-settings-app.md — Settings app structure, SettingsProvider, SettingsLib, search index, slice surface

When to load which chapter

  • Question mentions SystemUI, status bar, notification shade, keyguard, QS, Monet → 48-systemui.md
  • Question mentions Launcher3, Recents, Overview, gesture nav, all-apps → 49-launcher3.md
  • Question mentions Settings app, SettingsProvider, SettingsLib, slice → 50-settings-app.md

© aospbooks, 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

Just SKILL.md in agents/_content/parts/system-apps of aospbooks/aosp-internal-book.

Open the folder on GitHubat commit fc0b48b

Compare with similar skills

Aosp System Apps 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.

Aosp System Apps compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Aosp System Apps this skillaospbooks/aosp-internal-book139—~320Automated safety check: PassApache-2.0
Deepseek Reasonruvnet/ruflo74k—~626Automated safety check: NotesMIT
Step Partsearthtojake/text-to-cad19k1 repos~1.5kAutomated safety check: PassMIT
Ejentum Reasoning Harnesssickn33/agentic-awesome-skills47k1 repos~1.9kAutomated safety check: PassMIT
Canopy Part Title Blockheygen-com/hyperframes59k1 repos~1kAutomated safety check: PassApache-2.0
Nowait Reasoning Optimizerdavila7/claude-code-templates32k2 repos~1.2kAutomated safety check: PassMIT

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Questions about Aosp System Apps

What does Aosp System Apps do?

AOSP Part XI — System Apps. An agent skill from aospbooks/aosp-internal-book. Aosp System Apps is an agent skill from aospbooks/aosp-internal-book. AOSP Part XI — System Apps.

When should I use Aosp System Apps?

Aosp System Apps fits situations like: reasoning about SystemUI (status bar; notification shade; monet/dynamic color); launcher3 (model loader.

How do I install Aosp System Apps in Claude Code?

Run `npx skills add aospbooks/aosp-internal-book --skill aosp-system-apps -a claude-code`. Or copy the skill folder (agents/_content/parts/system-apps in aospbooks/aosp-internal-book) into .claude/skills/aosp-system-apps in your project. Claude Code loads it when a task matches its description.

How do I install Aosp System Apps in Codex?

Run `npx skills add aospbooks/aosp-internal-book --skill aosp-system-apps -a codex`. Or copy the skill folder (agents/_content/parts/system-apps in aospbooks/aosp-internal-book) into .agents/skills/aosp-system-apps in your project. Codex loads it when a task matches its description.

Can I use Aosp System Apps 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 aospbooks/aosp-internal-book --skill aosp-system-apps -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/aosp-system-apps, .gemini/skills/aosp-system-apps, .github/skills/aosp-system-apps and .opencode/skills/aosp-system-apps in your project.

What does Aosp System Apps need to run?

SKILL.md names no scripts, command-line tools or credentials: Aosp System Apps is instructions for the agent only.

Does Aosp System Apps 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 Aosp System Apps 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 Aosp System Apps use?

Aosp System Apps 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 Aosp System Apps use?

About 320 tokens (SKILL.md is roughly 1.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Aosp System Apps?

Skills that share tags, products or a category with Aosp System Apps: Deepseek Reason (ruvnet/ruflo, 74k stars), Step Parts (earthtojake/text-to-cad, 19k stars), Ejentum Reasoning Harness (sickn33/agentic-awesome-skills, 47k stars) and Canopy Part Title Block (heygen-com/hyperframes, 59k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Aosp System Apps?

aospbooks (a GitHub organization) maintains it in aospbooks/aosp-internal-book, which has 139 GitHub stars. The repository holds 17 skills in this directory. The repository was last updated on October 5, 2026.

Source: aospbooks/aosp-internal-book on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.