R8 Analyzer

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 the version is lower than 9.3, suggest migration to 9.3 for the simplified optimization {} DSL and the Configuration Analyzer task.
• Full mode : Verify android.enableR8.fullMode=false is removed from the gradle.properties file.

Step 2. Analysis path selection

• Inspect build.gradle, build.gradle.kts, settings.gradle, settings.gradle.kts, gradle.properties, and libs.versions.toml to get the AGP and R8 versions. An R8 version pinned in settings.gradle(.kts) replaces the R8 bundled with AGP.

• Find the app module (usually app) and a build variant with R8 enabled (usually release). The following commands use them as <module> and <Variant>, for example :app:minifyReleaseWithR8.

• The helper scripts are in this skill's scripts/ directory. In the following commands, <skill_dir> is this skill's directory. Run every command from the project root.

• If AGP >= 9.3.0 : Proceed to Path A (Standalone Task).

• If AGP < 9.3.0 : Proceed to Path B (Quantitative).

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

• Step 1: Check requirements : Python and the protobuf package 6.33.4 or later are mandatory (used by scripts/keep_radius_pb2.py). Install it with pip install "protobuf>=6.33.4"; versions lower than 6.33.4 fail on import with a VersionError or ImportError.
• Step 2: Run standalone task on R8-enabled build : For the module and variant you found during path selection, run ./gradlew :<module>:analyze<Variant>R8Config (for example, ./gradlew :app:analyzeReleaseR8Config). It generates the report in <module>/build/reports/r8/ (for example, app/build/reports/r8/r8-config-analyzer-release.pb). You must wait for this command to finish before proceeding.
• Step 3: Convert to JSON : You must explicitly run the conversion script scripts/convert_pb_to_json.py as python3 <skill_dir>/scripts/convert_pb_to_json.py with arguments <module>/build/reports/r8 and tmp/keepradius/keepruleradius.json. Wait for this command to finish.
• Step 4: Analyze : You must explicitly run the analysis script scripts/analyze.py by executing python3 <skill_dir>/scripts/analyze.py tmp/keepradius/keepruleradius.json. This outputs tmp/keepradius/analysis_result.txt. Wait for this command to finish.

Path B: Invoke R8 release build (AGP < 9.3.0)

• Step 1: Check requirements : Python and the protobuf package 6.33.4 or later are mandatory: pip install "protobuf>=6.33.4".
• Step 2: Generate and analyze : You must run the shell commands described in references/FULL_BUILD_CONFIG_ANALYZER.md to temporarily update the R8 version in settings.gradle(.kts) to 9.4.34 or later (so R8 generates the report), generate the proto report in tmp/r8analysis/, convert it to tmp/r8analysis/keepruleradius.json, analyze the result, and revert the temporary settings.gradle(.kts) change.
• Step 3: Analyze : Verify that the analysis outputs tmp/r8analysis/analysis_result.txt for scores and rule impact metrics.

Step 3. Report generation

• Format : Follow references/REPORT_FORMAT.md strictly.
• Redundant rules : Check keep rules against references/INSPECT-RULES.md. If a keep rule matches a pattern in references/INSPECT-RULES.md, include the guidance and remediation from that reference alongside the impact metrics.
• Input : Extract metrics (Scores, Impacts, Example Classes, rule origins) directly from the generated file tmp/keepradius/analysis_result.txt if using Path A, or tmp/r8analysis/analysis_result.txt if using Path B.
• Output : Short progress updates are fine while Gradle runs; the final message is the report only. Output only the raw Markdown report in the chat. Do not output conversational filler (for example, "Here is your report..."). Do not provide recommendations, next steps, or any other text outside of the sections defined in references/REPORT_FORMAT.md. Do not mention the path used for analysis of the configuration.

Constraints

• Strict output limit: The final output must strictly be the Markdown report and nothing else.
• No code changes : Research and suggest only; do not modify project files. Create files only under tmp/ (analysis output, the settings backup, and any scratch scripts), and never write the report to a file. The one exception is the temporary R8 classpath in settings.gradle(.kts) that Path B needs when the project doesn't already pin R8 9.4.34 or later: ask the user first when running interactively, and revert it after the analysis (see references/FULL_BUILD_CONFIG_ANALYZER.md). If that change is needed but the user says no, or asks you not to edit build files, report rule-level and build file findings without scores and say why.
• No placeholder scores : Never print N/A% as a score.
• No redundancy: Do not explain R8 benefits or reference skill internal files in the report.
• Focus: Omit sections (for example, Subsumed Rules, Configuration) if no issues or items are found.