Brainstorming
xpinjection/test-driven-spring-boot
You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior.
A skill your agent uses for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not…
MPL-2.0Auto-check passed
Install Compatibility Strategy
$ npx skills add kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install kernitus/BukkitOldCombatMechanics compatibility-strategy --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/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/compatibility-strategy .claude/skills/compatibility-strategy && 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 "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .claude/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategyType 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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install kernitus/BukkitOldCombatMechanics compatibility-strategy --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/compatibility-strategy .agents/skills/compatibility-strategy && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .agents/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install kernitus/BukkitOldCombatMechanics compatibility-strategy --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/compatibility-strategy .cursor/skills/compatibility-strategy && 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 "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .cursor/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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/kernitus/BukkitOldCombatMechanics.git --path .agents/skills/compatibility-strategy--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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install kernitus/BukkitOldCombatMechanics compatibility-strategy --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/compatibility-strategy .gemini/skills/compatibility-strategy && 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 "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .gemini/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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 kernitus/BukkitOldCombatMechanics compatibility-strategyInstalls 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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/compatibility-strategy .github/skills/compatibility-strategy && 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 "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .github/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install kernitus/BukkitOldCombatMechanics compatibility-strategy --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/kernitus/BukkitOldCombatMechanics.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/compatibility-strategy .opencode/skills/compatibility-strategy && 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 "compatibility-strategy" agent skill from https://github.com/kernitus/BukkitOldCombatMechanics/tree/master/.agents/skills/compatibility-strategy into .opencode/skills/compatibility-strategy/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "compatibility-strategy", 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
compatibility-strategy- GitHub stars
- 225
- Token cost
- ~824 tokens
- SKILL.md length
- 380 words
- Files
- 1
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- MPL-2.0
At a glance
A skill your agent uses for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not…
- Works in 6 steps: Identify the minimum supported Java… → Identify whether Bukkit/Paper exposes a… → If an API may be missing or backported,… → …
- Java 8 backports
- SKILL.md covers When to use, When not to use, Required stance and Compatibility checklist, plus 3 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Compatibility Strategy is an agent skill from kernitus/BukkitOldCombatMechanics. Use for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not use for release publishing, PR wording, or simple test-running decisions.
Its SKILL.md is about 820 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with Java. The repository describes itself as: Minecraft plugin to configure combat mechanics for 1.9 onwards. The licence is MPL-2.0.
When your agent uses it
- Java 8 backports
- Bukkit/Paper version differences
- PacketEvents compatibility
- Fake-player implementation choices
Example prompts
- “/compatibility-strategy”
Workflow steps
6 steps, taken from the first numbered list in SKILL.md.
- Identify the minimum supported Java runtime for the touched source set.
- Identify whether Bukkit/Paper exposes a direct API for the target behaviour.
- If an API may be missing or backported, add runtime feature detection.
- Choose a safe fallback that preserves existing behaviour where feature detection fails.
- Keep diagnostics actionable when every candidate path fails.
- Select validation versions that cover the compatibility boundary, usually a legacy version plus a modern Paper version.
What it can do on your machine
Read from SKILL.md and the folder at commit e66e7a9. 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
Compatibility Strategy loads about 824 tokens when it runs. Until then it costs about 68 tokens; SKILL.md has 380 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 kernitus/BukkitOldCombatMechanics at commit e66e7a9, republished under its MPL-2.0 licence (© kernitus). 380 words, ~824 tokens.
Download SKILL.mdSave it as
.claude/skills/compatibility-strategy/SKILL.md (or your agent's skills folder).- name
- compatibility-strategy
- description
- Use for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not use for release publishing, PR wording, or simple test-running decisions.
Compatibility Strategy
Use this skill when a change must behave across legacy and modern Bukkit/Paper versions or across different Java runtimes.
When to use
- Java 8 source compatibility or dependency updates that might introduce newer APIs.
- NMS, CraftBukkit, Paper, PacketEvents, XSeries, or reflection-sensitive changes.
- Fake-player internals, attack delivery, fire ticks, entity ticking, or synthetic network plumbing.
- Decisions about feature detection versus hard-coded Minecraft version checks.
- Fallback behaviour on Spigot, Paper, legacy 1.12/1.9, or modern 1.20.5+ servers.
When not to use
- Do not use for release asset or publishing checks; use
release-readiness-review. - Do not use for config/modeset-only changes unless compatibility affects the implementation; use
module-config-changefirst. - Do not use for PR prose only; use
pr-draft-summary.
Required stance
- Prefer direct supported APIs when present.
- Use reflection only as a fallback or compatibility bridge, especially off hot paths.
- Prefer feature detection by class, method, field, component, or capability over hard-coded version numbers.
- Keep Java 8-targeted code free of Java 9+ collection factories,
Stream.toList(), records, pattern matching, and other newer language/runtime features. - For NMS access, prefer
utilities.reflection.Reflectorhelpers where they fit the problem. - Avoid hard-coded versioned NMS class names unless no heuristic or API-based path is viable.
Show full SKILL.md (187 more words)Show less
Compatibility checklist
- Identify the minimum supported Java runtime for the touched source set.
- Identify whether Bukkit/Paper exposes a direct API for the target behaviour.
- If an API may be missing or backported, add runtime feature detection.
- Choose a safe fallback that preserves existing behaviour where feature detection fails.
- Keep diagnostics actionable when every candidate path fails.
- Select validation versions that cover the compatibility boundary, usually a legacy version plus a modern Paper version.
Java 8 reminders
- Use
collect(Collectors.toList())instead ofStream.toList(). - Use mutable collections wrapped with
Collections.unmodifiable*where immutable Java 9 factories would otherwise be tempting. - Avoid records, sealed classes, switch expressions, pattern matching, and
varin Java source. - Main build config targets Java 8 via
options.release.set(8)and KotlinjvmTarget = 1.8.
Fake-player and NMS reminders
- The primary fake-player path is modern-NMS-oriented and relies on reflection remapping.
- Legacy 1.12 uses versioned NMS and currently needs dedicated or version-aware handling for realistic fake-player tests.
- Fake players are simulated login/network entities, not real network clients.
- PacketEvents may need fake users or explicit client-version seeding in synthetic scenarios.
References
- Broader test-harness and historical notes:
../integration-test-verification/references/relocated-agents-notes.md.
© kernitus, MPL-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
Just SKILL.md in .agents/skills/compatibility-strategy of kernitus/BukkitOldCombatMechanics.
Open the folder on GitHubat commit e66e7a9
Compare with similar skills
Compatibility Strategy 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 |
|---|---|---|---|---|---|---|
| Compatibility Strategy this skillkernitus/BukkitOldCombatMechanics | 225 | — | ~824 | Automated safety check: Pass | MPL-2.0 | |
| Brainstormingxpinjection/test-driven-spring-boot | 112 | 54 repos | ~2.6k | Automated safety check: Pass | MIT | |
| Android API Diffgkd-kit/gkd | 43k | — | ~796 | Automated safety check: Pass | GPL-3.0 | |
| Video Cover Imageitwanger/toBeBetterJavaer | 18k | — | ~3.3k | Automated safety check: Pass | None | |
| Lancedb Update Lance Dependencylancedb/lancedb | 12k | — | ~1.1k | Automated safety check: Pass | Apache-2.0 | |
| Java SDK E2E Test with Replay Snapshotgithub/copilot-sdk | 11k | — | ~1.8k | Automated safety check: Pass | MIT |
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Questions about Compatibility Strategy
What does Compatibility Strategy do?
A skill your agent uses for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not…. Compatibility Strategy is an agent skill from kernitus/BukkitOldCombatMechanics. Use for Java 8 backports, Bukkit/Paper version differences, NMS/reflection, PacketEvents compatibility, fake-player implementation choices, and feature-detection design; do not use for release publishing, PR wording, or simple test-running decisions.
When should I use Compatibility Strategy?
Compatibility Strategy fits situations like: java 8 backports; bukkit/Paper version differences; packetEvents compatibility; fake-player implementation choices.
How do I install Compatibility Strategy in Claude Code?
Run `npx skills add kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a claude-code`. Or copy the skill folder (.agents/skills/compatibility-strategy in kernitus/BukkitOldCombatMechanics) into .claude/skills/compatibility-strategy in your project. Claude Code loads it when a task matches its description.
How do I install Compatibility Strategy in Codex?
Run `npx skills add kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a codex`. Or copy the skill folder (.agents/skills/compatibility-strategy in kernitus/BukkitOldCombatMechanics) into .agents/skills/compatibility-strategy in your project. Codex loads it when a task matches its description.
Can I use Compatibility Strategy 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 kernitus/BukkitOldCombatMechanics --skill compatibility-strategy -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/compatibility-strategy, .gemini/skills/compatibility-strategy, .github/skills/compatibility-strategy and .opencode/skills/compatibility-strategy in your project.
What does Compatibility Strategy need to run?
SKILL.md names no scripts, command-line tools or credentials: Compatibility Strategy is instructions for the agent only.
Does Compatibility Strategy 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 Compatibility Strategy 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 Compatibility Strategy use?
Compatibility Strategy is published under the MPL-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Compatibility Strategy use?
About 824 tokens (SKILL.md is roughly 3.3k 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 Compatibility Strategy?
Skills that share tags, products or a category with Compatibility Strategy: Brainstorming (xpinjection/test-driven-spring-boot, 112 stars), Android API Diff (gkd-kit/gkd, 43k stars), Video Cover Image (itwanger/toBeBetterJavaer, 18k stars) and Lancedb Update Lance Dependency (lancedb/lancedb, 12k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Compatibility Strategy?
kernitus (a GitHub user) maintains it in kernitus/BukkitOldCombatMechanics, which has 225 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 4, 2026.
Source: kernitus/BukkitOldCombatMechanics on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.