An Android build review guide focused on R8, the tool that shrinks and optimizes Android apps, and its keep rules, which prevent required code from being removed.

Use it when reviewing keep rules, reducing Android app size, or troubleshooting code that breaks after shrinking or optimization.

It helps find rules that are duplicated, apply to more code than necessary, or repeat rules already supplied by libraries. This can clarify ProGuard or R8 configuration problems and reduce unnecessary app code.

How mmarca-tech/OpenVitals configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to mmarca-tech/OpenVitals. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/mmarca-tech/OpenVitals/main/.claude/skills/r8-analyzer/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/mmarca-tech/OpenVitals

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/mmarca-tech/openvitals/r8-analyzer/github.svg)](https://agentmods.dev/skills/mmarca-tech/openvitals/r8-analyzer)

Your own site

<a href="https://agentmods.dev/skills/mmarca-tech/openvitals/r8-analyzer"><img src="https://agentmods.dev/badge/skills/mmarca-tech/openvitals/r8-analyzer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/mmarca-tech/openvitals/r8-analyzer"><img src="https://agentmods.dev/badge/skills/mmarca-tech/openvitals/r8-analyzer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 60 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,151 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.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00060	$0.01151
Opus 5.5	$0.00024	$0.00460
Sonnet 5.5	$0.00012	$0.00230
Haiku 4.5	$0.00006	$0.00115

Measured 2mo ago against content hash 16e5a9831b00, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

r8-analyzer 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 2mo 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.

.claude/skills/r8-analyzer/SKILL.md · 70 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

Read it on GitHub

Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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.

2mo ago First seen · 70 lines · 60 tokens per session scan A 16e5a9831b00

Subscribe to this mod's changes

r8-analyzer is a skill published in the GitHub repository mmarca-tech/OpenVitals (13 stars, last pushed 1mo ago), licensed AGPL-3.0. It adds 60 tokens to every session and 1,151 once invoked, about $0.0002 per session on Opus 5.5. 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.

Debugging Mobile

r8-analyzer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
r8-analyzermmarca-tech/OpenVitals	Skill	13	1mo ago	AGPL-3.0	A	60	Claude Code
ios-fixgarrytan/gstack	Skill	140k	yesterday	MIT	A	15	Claude Code
node-connectopenclaw/openclaw	Skill	394k	yesterday	MIT	A	39	Claude Code, Codex
google-mobile-ads-validategoogle/skills	Skill	22k	yesterday	Apache-2.0	A	84	Claude Code, Codex
jetpack-compose-performanceandroid/skills	Skill	10k	yesterday	Apache-2.0	A	41	Claude Code
android-tombstone-symbolicationdotnet/skills	Skill	5.8k	yesterday	MIT	A	176	Claude Code
swiftui-performance-auditsteipete/agent-scripts	Skill	7.5k	7d ago	MIT	A	24	Claude Code, Codex

OpenVitals: Skill for Claude Code