An analyzer for Android build settings and R8 keep rules. R8 shrinks and optimizes Android apps, while keep rules tell it which code must not be removed or changed.

Use it to review R8 and ProGuard configuration, identify redundant rules, and troubleshoot Android build settings.

It helps find unnecessary, overly broad, or overlapping rules that can make configuration harder to maintain or reduce the benefits of app shrinking.

r8-analyzer — Skill for Claude Code and Codex by TalissonVitorino

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 TalissonVitorino/kmp-ios-skills --skill r8-analyzer

Clone the repo

git clone --depth 1 https://github.com/TalissonVitorino/kmp-ios-skills

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/r8-analyzer/github.svg)](https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/r8-analyzer)

Your own site

<a href="https://agentmods.dev/skills/talissonvitorino/kmp-ios-skills/r8-analyzer"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/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/talissonvitorino/kmp-ios-skills/r8-analyzer"><img src="https://agentmods.dev/badge/skills/talissonvitorino/kmp-ios-skills/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 1,107 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 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.

Model	Per session	Once invoked
Fable 5.1	$0.00060	$0.01107
Opus 5	$0.00030	$0.00553
Sonnet 5	$0.00012	$0.00221
Haiku 4.5	$0.00006	$0.00111

Measured 12d ago against content hash ae387a7d6632, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, 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 12d 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.

android/r8-analyzer/SKILL.md · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Step 1. Setup and configuration check

Inspect build.gradle, build.gradle.kts, and gradle.properties.
Use references/CONFIGURATION.md to identify missing optimizations.
AGP : If version is lower than 9.0, suggest migration to 9.0 for build-time performance improvement.
Full Mode : Verify android.enableR8.fullMode=false is removed from gradle.properties.

Step 2. Analysis path selection

Inspect build.gradle, build.gradle.kts, and gradle.properties and libs.versions.toml to get the AGP and R8 versions.
If AGP >= 9.3.0 : Proceed to Path A (Standalone Task).
If AGP < 9.3.0 and R8 >= 9.3.7-dev : Proceed to Path B (Quantitative).
If none of the conditions are met, proceed to Path C (Heuristic).

Path A: Standalone Gradle task (AGP >= 9.3.0)

Step 1: Run standalone task : Run ./gradlew :app:analyzeReleaseR8Config to evaluate the R8 configuration. You MUST wait for this command to finish before proceeding.
Step 2: Convert and analyze : The report is generated at app/build/reports/r8/r8-config-analyzer-release.pb. Convert it to JSON and analyze it using the conversion and analysis scripts in references/CONFIGURATION-ANALYZER.md, producing analysis_result.txt. Wait for each command to finish.

Path B: Quantitative data generation (R8 >= 9.3.7-dev and AGP < 9.3.0)

Step 1: Check requirements : Python and protobuf package are mandatory.
Step 2: Generate and analyze : You MUST run the shell commands described in references/CONFIGURATION-ANALYZER.md to generate the proto file using R8 configuration analyzer, convert it to JSON and analyze the result.
Step 3: Analyze : You MUST ensure the analysis produces analysis_result.txt for scores and rule impact metrics.

Path C: Heuristic evaluation and recommendation (R8 < 9.3.7-dev)

Read the full file on GitHub · 69 lines

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.

12d ago First seen · 69 lines · 60 tokens per session scan A ae387a7d6632

Subscribe to this mod's changes

r8-analyzer is a skill published in the GitHub repository TalissonVitorino/kmp-ios-skills (12 stars, last pushed 17d ago), licensed MIT. It adds 60 tokens to every session and 1,107 once invoked, about $0.0003 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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