Brainstorming
xpinjection/test-driven-spring-boot
You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior.
Java Memory Model audit of all VarHandle/volatile field access modes
Apache-2.0Auto-check passed
Install Audit Jmm
$ npx skills add ben-manes/caffeine --skill audit-jmm -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ben-manes/caffeine audit-jmm --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/ben-manes/caffeine.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/audit-jmm .claude/skills/audit-jmm && 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 "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .claude/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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/ben-manes/caffeine/tree/master/.claude/skills/audit-jmmType 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 ben-manes/caffeine --skill audit-jmm -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ben-manes/caffeine audit-jmm --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ben-manes/caffeine.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/audit-jmm .agents/skills/audit-jmm && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .agents/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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 ben-manes/caffeine --skill audit-jmm -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ben-manes/caffeine audit-jmm --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ben-manes/caffeine.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/audit-jmm .cursor/skills/audit-jmm && 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 "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .cursor/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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/ben-manes/caffeine.git --path .claude/skills/audit-jmm--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 ben-manes/caffeine --skill audit-jmm -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ben-manes/caffeine audit-jmm --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ben-manes/caffeine.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/audit-jmm .gemini/skills/audit-jmm && 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 "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .gemini/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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 ben-manes/caffeine audit-jmmInstalls 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 ben-manes/caffeine --skill audit-jmm -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/ben-manes/caffeine.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/audit-jmm .github/skills/audit-jmm && 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 "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .github/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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 ben-manes/caffeine --skill audit-jmm -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install ben-manes/caffeine audit-jmm --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/ben-manes/caffeine.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/audit-jmm .opencode/skills/audit-jmm && 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 "audit-jmm" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-jmm into .opencode/skills/audit-jmm/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-jmm", 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
audit-jmm- GitHub stars
- 18k
- Token cost
- ~509 tokens
- SKILL.md length
- 267 words
- Files
- 1
- Skills in repo
- 33
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Java Memory Model audit of all VarHandle/volatile field access modes
- Works in 4 steps: State the field name, type, and declared… → List every read and write with: access… → For each (write, read) pair: state… → …
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Audit Jmm is an agent skill from ben-manes/caffeine. Java Memory Model audit of all VarHandle/volatile field access modes
Its SKILL.md is about 510 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: A high performance caching library for Java. The licence is Apache-2.0.
Example prompts
- “/audit-jmm”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- State the field name, type, and declared access mode.
- List every read and write with: access mode, method/line, locks held.
- For each (write, read) pair: state whether happens-before is guaranteed.
- Identify any field where
What it can do on your machine
Read from SKILL.md and the folder at commit e972fb0. 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
Audit Jmm loads about 509 tokens when it runs. Until then it costs about 20 tokens; SKILL.md has 267 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 ben-manes/caffeine at commit e972fb0, republished under its Apache-2.0 licence (© ben-manes). 267 words, ~509 tokens.
Download SKILL.mdSave it as
.claude/skills/audit-jmm/SKILL.md (or your agent's skills folder).- name
- audit-jmm
- description
- Java Memory Model audit of all VarHandle/volatile field access modes
- context
- fork
- agent
- auditor
- disable-model-invocation
- true
Perform a Java Memory Model audit of the cache.
For every field accessed via VarHandle or Unsafe, and for every field declared volatile or accessed under synchronization:
- State the field name, type, and declared access mode.
- List every read and write with: access mode, method/line, locks held.
- For each (write, read) pair: state whether happens-before is guaranteed. If it depends on access mode, verify BOTH sides use compatible modes.
- Identify any field where:
- Plain/opaque write paired with plain/opaque read across threads with no intervening synchronization
- Code relies on opaque providing ordering beyond coherence
- Volatile read on one field but non-volatile on a correlated field
Specific areas to examine:
- writeTime: encodes both timestamp and refresh-in-progress flag
- accessTime: is opaque access sufficient for expiration?
- key/value fields: do value reads provide visibility of the object's fields?
- policyWeight vs weight: correlated but updated at different times
For each issue:
- State the specific reordering or visibility failure
- Construct a concrete 2-thread execution
- Verify the execution is legal under the JMM (not just TSO)
Do not report issues that only affect performance. Do not report deliberately racy patterns with documented stale-read tolerance.
Platform focus: Pay specific attention to aarch64 (ARM) memory ordering.
ARM's weaker-than-TSO model exposes reordering bugs invisible on x86.
Historical bug (#1820): a weak/soft-value setValue published the new
WeakValueReference with setRelease and then cleared the old reference.
Without a storeStoreFence between them, aarch64 could make the clear()
visible before the publication, so a reader saw a null value. Check for
similar patterns: a release store followed by a store that a racing reader
must not observe first.
© ben-manes, 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
Just SKILL.md in .claude/skills/audit-jmm of ben-manes/caffeine.
Open the folder on GitHubat commit e972fb0
Compare with similar skills
Audit Jmm 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 |
|---|---|---|---|---|---|---|
| Audit Jmm this skillben-manes/caffeine | 18k | — | ~509 | Automated safety check: Pass | Apache-2.0 | |
| Brainstormingxpinjection/test-driven-spring-boot | 112 | 52 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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Related
Works with
Questions about Audit Jmm
What does Audit Jmm do?
Java Memory Model audit of all VarHandle/volatile field access modes. Audit Jmm is an agent skill from ben-manes/caffeine.
How do I install Audit Jmm in Claude Code?
Run `npx skills add ben-manes/caffeine --skill audit-jmm -a claude-code`. Or copy the skill folder (.claude/skills/audit-jmm in ben-manes/caffeine) into .claude/skills/audit-jmm in your project. Claude Code loads it when a task matches its description.
How do I install Audit Jmm in Codex?
Run `npx skills add ben-manes/caffeine --skill audit-jmm -a codex`. Or copy the skill folder (.claude/skills/audit-jmm in ben-manes/caffeine) into .agents/skills/audit-jmm in your project. Codex loads it when a task matches its description.
Can I use Audit Jmm 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 ben-manes/caffeine --skill audit-jmm -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/audit-jmm, .gemini/skills/audit-jmm, .github/skills/audit-jmm and .opencode/skills/audit-jmm in your project.
What does Audit Jmm need to run?
SKILL.md names no scripts, command-line tools or credentials: Audit Jmm is instructions for the agent only.
Does Audit Jmm 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 Audit Jmm 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 Audit Jmm use?
Audit Jmm 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 Audit Jmm use?
About 509 tokens (SKILL.md is roughly 2k 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 Audit Jmm?
Skills that share tags, products or a category with Audit Jmm: 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 Audit Jmm?
ben-manes (a GitHub user) maintains it in ben-manes/caffeine, which has 17,882 GitHub stars. The repository holds 33 skills in this directory. The repository was last updated on October 9, 2026.
Source: ben-manes/caffeine on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.