Android Hidden API and R8 Check
gkd-kit/gkd
Checks whether Android hidden-API implementations and system callbacks survive R8 minification, and diagnoses Release-only failures such as AbstractMethodError.
Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle.
Install Domain Distiller
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install nekomangaorg/Neko domain-distiller --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/distiller .claude/skills/domain-distiller && rm -rf skills-srcUse ~/.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/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .claude/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distillerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install nekomangaorg/Neko domain-distiller --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/distiller .agents/skills/domain-distiller && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .agents/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install nekomangaorg/Neko domain-distiller --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/distiller .cursor/skills/domain-distiller && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .cursor/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/nekomangaorg/Neko.git --path .agents/skills/distiller--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install nekomangaorg/Neko domain-distiller --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/distiller .gemini/skills/domain-distiller && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .gemini/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install nekomangaorg/Neko domain-distillerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/distiller .github/skills/domain-distiller && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .github/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add nekomangaorg/Neko --skill domain-distiller -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install nekomangaorg/Neko domain-distiller --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/nekomangaorg/Neko.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/distiller .opencode/skills/domain-distiller && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "domain-distiller" agent skill from https://github.com/nekomangaorg/Neko/tree/main/.agents/skills/distiller into .opencode/skills/domain-distiller/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-distiller", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
domain-distiller- GitHub stars
- 2.8k
- Token cost
- ~1k tokens
- SKILL.md length
- 519 words
- Files
- 2
- Skills in repo
- 15
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle.
- Works in 5 steps: SCAN: Hunt for code duplication. Look… → SELECT & PROPOSE: Pick a pure business… → DISTILL (Upon Approval): Create a new… → …
- Decouple Android dependencies from business rules
- SKILL.md covers ✅ Always do:, ⚠️ Ask first:, 🚫 Never do: and Journaling Rules, plus 1 more section
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Domain Distiller is an agent skill from nekomangaorg/Neko. Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle. Use this skill to decouple Android dependencies from business rules, create domain-layer interactors, or reduce ViewModel bloat.
Its SKILL.md is about 1k tokens, which your agent loads only when the skill is triggered. The skill folder holds 1 other file (for example `journal.md`).
It sits in Mobile, covering Android development. It works with Kotlin and Android. The repository describes itself as: Unofficial MangaDex Reader for Android 8+. The licence is Apache-2.0.
When your agent uses it
- Decouple Android dependencies from business rules
- Create domain-layer interactors
- Reduce ViewModel bloat
Example prompts
- “Use the domain-distiller skill to extract duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly…”
- “/domain-distiller”
Workflow steps
5 steps, taken from the first numbered list in SKILL.md.
- SCAN: Hunt for code duplication. Look for identical validation logic in multiple ViewModels, massive map { } blocks in Repositories that…
- SELECT & PROPOSE: Pick a pure business rule that can be isolated. It should take inputs, apply logic without side effects, and return a…
- DISTILL (Upon Approval): Create a new class (e.g., class ValidatePasswordUseCase @Inject constructor()). Move the logic into an operator…
- VERIFY: Run ./gradlew ktfmtFormat. Run tests. Verify that the original UI tests/ViewModel tests still pass, and ensure the new Use Case…
- PRESENT: Create a PR strictly using the ref: conventional commit (e.g., ref: extract password strength validation into…
What it can do on your machine
Read from SKILL.md and the folder at commit e52cc82. 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
Domain Distiller loads about 1k tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 519 words of instructions outside code blocks.
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 nekomangaorg/Neko at commit e52cc82, republished under its Apache-2.0 licence (© nekomangaorg). 519 words, ~1,014 tokens.
Download SKILL.mdSave it as
.claude/skills/domain-distiller/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.- name
- domain-distiller
- description
- Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle. Use this skill to decouple Android dependencies from business rules, create domain-layer interactors, or reduce ViewModel bloat.
Goal
You are "The Distiller" ⚗️ — a domain-layer agent obsessed with the Single Responsibility Principle. Your mission is to identify duplicated or tangled business logic scattered across ViewModels, Repositories, or UI components, and extract it into ONE pure, highly testable Kotlin Use Case (Interactor).
Philosophy:
- ViewModels should coordinate; Use Cases should calculate.
- Repositories fetch data; Use Cases decide what that data means.
- Write it once, test it exhaustively, reuse it infinitely.
- The Domain layer must remain pure and platform-agnostic.
Constraints
✅ Always do:
- Explain the duplicated or tangled logic identified and the proposed Use Case extraction plan, then wait for user approval before modifying code.
- Run
./gradlew ktfmtFormatto ensure the newly created Use Case and modified classes are perfectly styled. - Run
./gradlew lintDebugand./gradlew testDebugUnitTestbefore creating a PR. - Write a dedicated, exhaustive Unit Test for the newly extracted Use Case.
- Use the
operator fun invoke()pattern to make the Use Case callable like a function. - Inject the Use Case into its consumers using the project's DI framework (e.g., Dagger/Hilt).
⚠️ Ask first:
- Wrapping the Use Case return type in a new Monad/Wrapper (e.g., introducing
Result<T>orEitherif the original code just threw exceptions). - Combining more than 3 Repositories into a single Use Case.
🚫 Never do:
- Import Android framework dependencies (like
Context,Intent, orView) into the Use Case. - Add UI-specific mapping (like converting a string to a Compose
Color) inside the Use Case. - Never use the prefix
refactor:in PR titles or commits. Useref:instead.
Instructions
Journaling Rules
Before starting, read .agents/skills/distiller/journal.md (create if missing) and write learnings to it. ONLY add journal entries for critical learnings (e.g., the specific Result/Error wrapper class this team uses, the team's naming convention for Use Cases, or a specific DI binding rule).
- Format:
## YYYY-MM-DD - [Title] **Learning:** [Insight] **Action:** [How to apply next time]
Show full SKILL.md (217 more words)Show less
Daily Process
- SCAN: Hunt for code duplication. Look for identical validation logic in multiple ViewModels, massive
map { }blocks in Repositories that calculate business rules, or ViewModels exceeding 300 lines due to heavy data manipulation. - SELECT & PROPOSE: Pick a pure business rule that can be isolated. It should take inputs, apply logic without side effects, and return a predictable output. Explain what was identified and detail the proposed Use Case design and calling sites. Wait for user approval before proceeding.
- DISTILL (Upon Approval): Create a new class (e.g.,
class ValidatePasswordUseCase @Inject constructor()). Move the logic into anoperator fun invoke(). Update the original ViewModels to inject and call the new Use Case instead of running the logic locally. - VERIFY: Run
./gradlew ktfmtFormat. Run tests. Verify that the original UI tests/ViewModel tests still pass, and ensure the new Use Case has 100% test coverage for its edge cases. - PRESENT: Create a PR strictly using the
ref:conventional commit (e.g.,ref: extract password strength validation into ValidatePasswordUseCase).
Examples
- Extracting complex regex and string validation out of the UI layer.
- Combining a
Flow<User>and aFlow<Preferences>from two separate Repositories into a singleGetUserSettingsUseCase. - Isolating the mathematical logic for calculating cart totals and applying discount codes.
- Extracting localized date/time formatting rules into a pure domain component.
© nekomangaorg, 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
SKILL.md and 1 other file in .agents/skills/distiller of nekomangaorg/Neko.
- SKILL.md
- journal.md
Open the folder on GitHubat commit e52cc82
Compare with similar skills
Domain Distiller 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.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Domain Distiller this skillnekomangaorg/Neko | 2.8k | — | ~1k | Automated safety check: Pass | Apache-2.0 | |
| Android Hidden API and R8 Checkgkd-kit/gkd | 43k | — | ~1.5k | Automated safety check: Pass | GPL-3.0 | |
| Compose Multiplatform Patternsmonta-app/ocpp-emulator | 180 | 5 repos | ~2k | Automated safety check: Pass | Apache-2.0 | |
| Android Developmentdpconde/claude-android-skill | 336 | — | ~1.7k | Automated safety check: Pass | MIT | |
| Claude Android NinjaDrjacky/claude-android-ninja | 124 | — | ~5.2k | Automated safety check: Pass | Apache-2.0 | |
| Expo Brownfield Integrationmweinbach/agent-coworker | 156 | 2 repos | ~900 | Automated safety check: Notes | Custom licence |
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Related
Categories
Questions about Domain Distiller
What does Domain Distiller do?
Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle. Domain Distiller is an agent skill from nekomangaorg/Neko. Extracts duplicated or tangled business logic from ViewModels, Repositories, or UI components into pure, highly testable Kotlin Use Cases (Interactors) following the Single Responsibility Principle.
When should I use Domain Distiller?
Domain Distiller fits situations like: decouple Android dependencies from business rules; create domain-layer interactors; reduce ViewModel bloat.
How do I install Domain Distiller in Claude Code?
Run `npx skills add nekomangaorg/Neko --skill domain-distiller -a claude-code`. Or copy the skill folder (.agents/skills/distiller in nekomangaorg/Neko) into .claude/skills/domain-distiller in your project. Claude Code loads it when a task matches its description.
How do I install Domain Distiller in Codex?
Run `npx skills add nekomangaorg/Neko --skill domain-distiller -a codex`. Or copy the skill folder (.agents/skills/distiller in nekomangaorg/Neko) into .agents/skills/domain-distiller in your project. Codex loads it when a task matches its description.
Can I use Domain Distiller 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 nekomangaorg/Neko --skill domain-distiller -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/domain-distiller, .gemini/skills/domain-distiller, .github/skills/domain-distiller and .opencode/skills/domain-distiller in your project.
What does Domain Distiller need to run?
SKILL.md names no scripts, command-line tools or credentials: Domain Distiller is instructions for the agent only.
Does Domain Distiller 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 Domain Distiller 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 Domain Distiller use?
Domain Distiller 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 Domain Distiller use?
About 1k tokens (SKILL.md is roughly 4.1k 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 Domain Distiller?
Skills that share tags, products or a category with Domain Distiller: Android Hidden API and R8 Check (gkd-kit/gkd, 43k stars), Compose Multiplatform Patterns (monta-app/ocpp-emulator, 180 stars), Android Development (dpconde/claude-android-skill, 336 stars) and Claude Android Ninja (Drjacky/claude-android-ninja, 124 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Domain Distiller?
nekomangaorg (a GitHub organization) maintains it in nekomangaorg/Neko, which has 2,812 GitHub stars. The repository holds 15 skills in this directory. The repository was last updated on October 9, 2026.
Source: nekomangaorg/Neko on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.