aosp-kernel-and-boot

aosp-kernel-and-boot is a skill for Claude Code, Codex from aospbooks/aosp-internal-book. It costs 114 tokens per session (411 once invoked), scanned A, original, Apache-2.0.

A guide to how Android starts up, loads its Linux kernel, and manages early system settings. It covers the handoff from the bootloader to Android's first services and security checks.

In plain words
What is it for?
Use it when working on Android startup, init scripts, the Generic Kernel Image, kernel modules, verified boot, or system properties.
Why use it?
It helps explain failures that happen before apps start, such as boot loops, rejected system images, or missing kernel support.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one.

Good fit Use it when working on Android startup, init scripts, the Generic Kernel Image, kernel modules, verified boot, or system properties.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/aospbooks/aosp-internal-book/kernel-and-boot
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add aospbooks/aosp-internal-book --skill kernel-and-boot
Clone the repo
git clone --depth 1 https://github.com/aospbooks/aosp-internal-book

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for aosp-kernel-and-boot

README.md
[![agentmods](https://agentmods.dev/badge/skills/aospbooks/aosp-internal-book/kernel-and-boot.svg)](https://agentmods.dev/skills/aospbooks/aosp-internal-book/kernel-and-boot)
Your own site
<a href="https://agentmods.dev/skills/aospbooks/aosp-internal-book/kernel-and-boot"><img src="https://agentmods.dev/badge/skills/aospbooks/aosp-internal-book/kernel-and-boot.svg" alt="Measured on agentmods" height="20"></a>
Per session 114 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 411 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00114 $0.00411
Opus 5 $0.00057 $0.00205
Sonnet 5 $0.00023 $0.00082
Haiku 4.5 $0.00011 $0.00041

Measured 8d ago against content hash 7f812966eb32, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

aosp-kernel-and-boot scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

agents/_content/parts/kernel-and-boot/SKILL.md · 33 lines

What it actually says

AOSP Part II — Kernel & Boot

How an Android device boots, how the Generic Kernel Image keeps vendor and platform decoupled, and how system properties fan out across the early-boot trust chain.

Chapters in this Part

  • 04-boot-and-init.md — bootloader handoff, first/second-stage init, init.rc parsing, services and triggers, early-mount, Zygote startup
  • 05-kernel.md — Generic Kernel Image, vendor modules, KMI stability, dm-verity / AVB, Android-specific subsystems
  • 06-system-properties.md — property_service, property contexts/SELinux, persistent properties, ro/persist/sys/build prefixes, getprop/setprop plumbing

When to load which chapter

  • Question mentions init, init.rc, services, triggers, Zygote startup, bootloader → 04-boot-and-init.md
  • Question mentions GKI, KMI, kernel modules, dm-verity, AVB, LMK, PSI, ashmem, memfd → 05-kernel.md
  • Question mentions getprop/setprop, system properties, ro./persist./sys./build. prefixes → 06-system-properties.md
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 8d ago First seen · 33 lines · 114 tokens per session scan A 7f812966eb32

Subscribe to this mod's changes

aosp-kernel-and-boot is a skill published in the GitHub repository aospbooks/aosp-internal-book (131 stars, last pushed 9d ago), licensed Apache-2.0. It adds 114 tokens to every session and 411 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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