Agent skill

Aosp Framework Core

by aospbooks in aospbooks/aosp-internal-book

AOSP Part VI — Framework Core. An agent skill from aospbooks/aosp-internal-book.

Apache-2.0Auto-check passed

Install Aosp Framework Core

skills CLI
$ npx skills add aospbooks/aosp-internal-book --skill aosp-framework-core -a claude-code

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

GitHub CLI
$ gh skill install aospbooks/aosp-internal-book aosp-framework-core --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/framework-core .claude/skills/aosp-framework-core && 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-framework-core
GitHub stars
138
Token cost
~628 tokens
SKILL.md length
152 words
Files
1
Skills in repo
17
Repo updated
First seen
Licence
Apache-2.0

At a glance

AOSP Part VI — Framework Core. An agent skill from aospbooks/aosp-internal-book.

  • Reasoning about systemservers boot sequence (the four boot phases
  • 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
  • Service registration

What it does

Aosp Framework Core is an agent skill from aospbooks/aosp-internal-book. AOSP Part VI — Framework Core. Use when reasoning about systemserver's boot sequence (the four boot phases, service registration, Watchdog), the Intent system (Intent matching, IntentFilter, IntentResolver, package visibility, intent verification), Activity & Window Management (ActivityTaskManagerService, WindowManagerService, activity lifecycle, task/stack model, splash screens), the window system (WindowState, SurfaceControl, input dispatching, focus, IME insets, transitions), the display system…

Its SKILL.md is about 630 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 systemservers boot sequence (the four boot phases
  • Service registration
  • The Intent system (Intent matching
  • Package visibility

Example prompts

  • “/aosp-framework-core”

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 Framework Core loads about 628 tokens when it runs. Until then it costs about 184 tokens; SKILL.md has 152 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~184
When it runs · the whole SKILL.md, loaded when a task matches
~628

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). 152 words, ~628 tokens.

Download SKILL.mdSave it as .claude/skills/aosp-framework-core/SKILL.md (or your agent's skills folder).
name
aosp-framework-core
description
AOSP Part VI — Framework Core. Use when reasoning about system_server's boot sequence (the four boot phases, service registration, Watchdog), the Intent system (Intent matching, IntentFilter, IntentResolver, package visibility, intent verification), Activity & Window Management (ActivityTaskManagerService, WindowManagerService, activity lifecycle, task/stack model, splash screens), the window system (WindowState, SurfaceControl, input dispatching, focus, IME insets, transitions), the display system (DisplayManagerService, logical vs. physical displays, HDR, brightness, refresh-rate switching), or the View system (View hierarchy, measure/layout/draw, Canvas/RenderNode, hardware acceleration). Chapters 20–25.
metadata.author
utzcoz
metadata.version
2026.06.24
metadata.last-updated
2026-10-05

AOSP Part VI — Framework Core

The Java/Kotlin layer running inside system_server that manages activities, windows, displays, and the View tree apps render into.

Chapters in this Part

  • 20-system-server.md — SystemServer.java, the four boot phases, service registration, Watchdog, lifecycle management, shutdown sequence
  • 21-intent-system.md — Intent matching, IntentFilter, IntentResolver, PackageManager queries, package visibility, intent verification
  • 22-activity-and-window.md — ActivityTaskManagerService, WindowManagerService, activity lifecycle state machine, task/stack model, splash screens
  • 23-window-system.md — WindowState, SurfaceControl, input dispatching, focus tracking, IME insets, transitions
  • 24-display-system.md — DisplayManagerService, logical vs. physical displays, color modes, HDR, brightness curves, refresh-rate switching
  • 25-view-system.md — View hierarchy, measure/layout/draw, Canvas/RenderNode, hardware acceleration, accessibility hooks

When to load which chapter

  • Question mentions system_server, boot phases, ServiceManager, Watchdog → 20-system-server.md
  • Question mentions Intent matching, IntentFilter, IntentResolver, package visibility → 21-intent-system.md
  • Question mentions ATM, WMS, activity lifecycle, splash screen, task/stack → 22-activity-and-window.md
  • Question mentions WindowState, SurfaceControl, input dispatch, focus, IME → 23-window-system.md
  • Question mentions DisplayManager, displays, HDR, refresh rate, brightness → 24-display-system.md
  • Question mentions View, ViewGroup, measure/layout/draw, Canvas, RenderNode → 25-view-system.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/framework-core of aospbooks/aosp-internal-book.

Open the folder on GitHubat commit fc0b48b

Compare with similar skills

Aosp Framework Core 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 Framework Core compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Aosp Framework Core this skillaospbooks/aosp-internal-book138—~628Automated safety check: PassApache-2.0
Deepseek Reasonruvnet/ruflo74k—~626Automated safety check: NotesMIT
Step Partsearthtojake/text-to-cad18k1 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-templates32k3 repos~1.2kAutomated safety check: PassMIT

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Questions about Aosp Framework Core

What does Aosp Framework Core do?

AOSP Part VI — Framework Core. An agent skill from aospbooks/aosp-internal-book. Aosp Framework Core is an agent skill from aospbooks/aosp-internal-book. AOSP Part VI — Framework Core.

When should I use Aosp Framework Core?

Aosp Framework Core fits situations like: reasoning about systemservers boot sequence (the four boot phases; service registration; the Intent system (Intent matching; package visibility.

How do I install Aosp Framework Core in Claude Code?

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

How do I install Aosp Framework Core in Codex?

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

Can I use Aosp Framework Core 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-framework-core -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-framework-core, .gemini/skills/aosp-framework-core, .github/skills/aosp-framework-core and .opencode/skills/aosp-framework-core in your project.

What does Aosp Framework Core need to run?

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

Does Aosp Framework Core 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 Framework Core 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 Framework Core use?

Aosp Framework Core 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 Framework Core use?

About 628 tokens (SKILL.md is roughly 2.5k 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 Framework Core?

Skills that share tags, products or a category with Aosp Framework Core: Deepseek Reason (ruvnet/ruflo, 74k stars), Step Parts (earthtojake/text-to-cad, 18k 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 Framework Core?

aospbooks (a GitHub organization) maintains it in aospbooks/aosp-internal-book, which has 138 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.