Swift Concurrency 6 2
affaan-m/ECC
Swift 6.2 Approachable Concurrency — single-threaded by default, @concurrent for explicit background offloading, isolated conformances for main actor types.
Analyze feature interaction pairs and triples for concurrent defects
Apache-2.0Auto-check passed
Install Audit Feature Interaction
$ npx skills add ben-manes/caffeine --skill audit-feature-interaction -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install ben-manes/caffeine audit-feature-interaction --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-feature-interaction .claude/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .claude/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interactionType 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-feature-interaction -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install ben-manes/caffeine audit-feature-interaction --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-feature-interaction .agents/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .agents/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interaction -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install ben-manes/caffeine audit-feature-interaction --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-feature-interaction .cursor/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .cursor/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interaction--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-feature-interaction -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install ben-manes/caffeine audit-feature-interaction --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-feature-interaction .gemini/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .gemini/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interactionInstalls 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-feature-interaction -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-feature-interaction .github/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .github/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interaction -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-feature-interaction --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-feature-interaction .opencode/skills/audit-feature-interaction && 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-feature-interaction" agent skill from https://github.com/ben-manes/caffeine/tree/master/.claude/skills/audit-feature-interaction into .opencode/skills/audit-feature-interaction/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "audit-feature-interaction", 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-feature-interaction- GitHub stars
- 18k
- Token cost
- ~524 tokens
- SKILL.md length
- 240 words
- Files
- 1
- Skills in repo
- 33
- Repo updated
- First seen
- Licence
- Apache-2.0
At a glance
Analyze feature interaction pairs and triples for concurrent defects
- Works in 4 steps: Refresh + expiration (D+B) — most-bugged… → Reference collection + any feature (C+*)… → Async completion + any feature (F+*) —… → …
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Audit Feature Interaction is an agent skill from ben-manes/caffeine. Analyze feature interaction pairs and triples for concurrent defects
Its SKILL.md is about 520 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
The repository describes itself as: A high performance caching library for Java. The licence is Apache-2.0.
Example prompts
- “/audit-feature-interaction”
Workflow steps
4 steps, taken from the first numbered list in SKILL.md.
- Refresh + expiration (D+B) — most-bugged interaction historically
- Reference collection + any feature (C+*) — value reference visibility
- Async completion + any feature (F+*) — future lifecycle edge cases
- Eviction + weight change (A+H) — counter drift during transitions
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 Feature Interaction loads about 524 tokens when it runs. Until then it costs about 24 tokens; SKILL.md has 240 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). 240 words, ~524 tokens.
Download SKILL.mdSave it as
.claude/skills/audit-feature-interaction/SKILL.md (or your agent's skills folder).- name
- audit-feature-interaction
- description
- Analyze feature interaction pairs and triples for concurrent defects
- context
- fork
- agent
- auditor
- disable-model-invocation
- true
Analyze the cache for defects arising from multiple features operating simultaneously on the same entry.
Assume at least one feature interaction bug exists. If your analysis yields zero findings, re-examine the top-priority pairs below — explain specifically why no interleaving produces a bug.
Priority ranking (from confirmed historical bugs):
- Refresh + expiration (D+B) — most-bugged interaction historically
- Reference collection + any feature (C+*) — value reference visibility
- Async completion + any feature (F+*) — future lifecycle edge cases
- Eviction + weight change (A+H) — counter drift during transitions
Features: A. Eviction (size/weight limit exceeded) B. Expiration (afterAccess, afterWrite, variable) C. Reference collection (weak key, weak value, soft value GC) D. Refresh (automatic reload) E. Loading (CacheLoader / computeIfAbsent) F. Async completion (CompletableFuture values) G. Listener notification (removal listener, eviction listener) H. Weight change (Weigher returning different weight for new value)
For each pair (A,B), (A,C), ..., (G,H) — 28 pairs total:
- Can both features trigger simultaneously on the same entry?
- If yes, construct the most adversarial interleaving.
- Trace step-by-step: correct processing? notifications? final state? cleanup?
After all pairs, identify highest-risk TRIPLE interactions:
- Eviction + expiration + listener exception
- Refresh + async completion + GC collection
- Weight change + eviction + compute
High-risk pairwise combinations:
- Eviction during refresh (entry evicted while refreshing)
- Expiration during compute (entry expires mid-computation)
- GC during async completion (future completes after weak ref collected)
- Weight change during eviction
- Listener exception during any other feature
For each defect: state the features involved, provide the interleaving, state the incorrect behavior.
© 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-feature-interaction of ben-manes/caffeine.
Open the folder on GitHubat commit e972fb0
Compare with similar skills
Audit Feature Interaction 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 Feature Interaction this skillben-manes/caffeine | 18k | — | ~524 | Automated safety check: Pass | Apache-2.0 | |
| Swift Concurrency 6 2affaan-m/ECC | 276k | 4 repos | ~2k | Automated safety check: Pass | MIT | |
| Remotion Interactivityremotion-dev/remotion | 63k | 5 repos | ~4.8k | Automated safety check: Pass | Custom licence | |
| Firecrawl Interact Integrationfirecrawl/firecrawl | 190k | 1 repos | ~731 | Automated safety check: Pass | ISC | |
| Swift Concurrency 6 2affaan-m/ECC | 276k | 3 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Pairingalsk1992/CloddsBot | 2.9k | — | ~1.5k | Automated safety check: Pass | MIT |
Similar skills
- Official
Remotion Interactivity
remotion-dev/remotion
Structure Remotion markup for interactivity. An agent skill from remotion-dev/remotion.
Firecrawl Interact Integration
firecrawl/firecrawl
Guides adding Firecrawl's /interact endpoint to product code for pages that need clicks, forms, pagination or logged-in flows beyond plain scraping.
Swift Concurrency 6 2
affaan-m/ECC
Swift 6.2 可接近的并发性 — 默认单线程，@concurrent 用于显式后台卸载，隔离一致性用于主 actor 类型。
Pairing
alsk1992/CloddsBot
User pairing, authentication, and trust management. An agent skill from alsk1992/CloddsBot.
Interaction To Next Paint
thedaviddias/Front-End-Checklist
A skill your agent uses when auditing slow page loads, heavy assets, or rendering delays related to Optimize interaction to next paint.
More from ben-manes/caffeine
All 33 skills in this repoCaffeine Cache Optimization Experiments
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Runs controlled JMH experiments on the Caffeine cache to find shared contention and hot-path waste, then reviews correctness and returns a reviewable patch.
Git History Bug Audit
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Audits a module by walking its git history commit by commit, tracking unresolved issues forward, and reporting the ones that survive to HEAD as findings.
Adversarial Codebase Audit
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Runs a hostile review of the Caffeine Java caching library with parallel subagents that get no design docs, then challenges and consolidates their findings.
Caffeine Performance Audit
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Audits the Caffeine cache source for hot-path costs such as allocations, contention and memory layout, reporting only findings tied to specific lines.
Audit Sibling Divergence
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Compares code paths that should behave the same, such as sync and async cache methods, and requires a concrete scenario where the two observably disagree.
Climber Step Minimization
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Prices each step of the window climber algorithm by disabling it in turn, to find steps that no longer earn their keep and branches that no longer fire.
Questions about Audit Feature Interaction
What does Audit Feature Interaction do?
Analyze feature interaction pairs and triples for concurrent defects. Audit Feature Interaction is an agent skill from ben-manes/caffeine.
How do I install Audit Feature Interaction in Claude Code?
Run `npx skills add ben-manes/caffeine --skill audit-feature-interaction -a claude-code`. Or copy the skill folder (.claude/skills/audit-feature-interaction in ben-manes/caffeine) into .claude/skills/audit-feature-interaction in your project. Claude Code loads it when a task matches its description.
How do I install Audit Feature Interaction in Codex?
Run `npx skills add ben-manes/caffeine --skill audit-feature-interaction -a codex`. Or copy the skill folder (.claude/skills/audit-feature-interaction in ben-manes/caffeine) into .agents/skills/audit-feature-interaction in your project. Codex loads it when a task matches its description.
Can I use Audit Feature Interaction 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-feature-interaction -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-feature-interaction, .gemini/skills/audit-feature-interaction, .github/skills/audit-feature-interaction and .opencode/skills/audit-feature-interaction in your project.
What does Audit Feature Interaction need to run?
SKILL.md names no scripts, command-line tools or credentials: Audit Feature Interaction is instructions for the agent only.
Does Audit Feature Interaction 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 Feature Interaction 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 Feature Interaction use?
Audit Feature Interaction 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 Feature Interaction use?
About 524 tokens (SKILL.md is roughly 2.1k 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 Audit Feature Interaction?
Skills that share tags, products or a category with Audit Feature Interaction: Swift Concurrency 6 2 (affaan-m/ECC, 276k stars), Remotion Interactivity (remotion-dev/remotion, 63k stars), Firecrawl Interact Integration (firecrawl/firecrawl, 190k stars) and Swift Concurrency 6 2 (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Audit Feature Interaction?
ben-manes (a GitHub user) maintains it in ben-manes/caffeine, which has 17,881 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.