Async Signal Safety Review

Q: What is a Claude Code skill and how does the Async Signal Safety Review skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Async Signal Safety Review is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-05-21

type:review

Review code changes for async-signal-safety violations in KSCrash crash handlers, signal handlers, and monitor code. Verifies suspect system calls by reading the actual implementation in Apple's open-source repos on github.com/apple-oss-distributions rather than guessing. Use when the user asks to review a diff/branch/PR/file for signal safety, or before landing changes that touch signal handlers, Mach exception handlers, or anything reachable from `Sources/KSCrashRecording`, `Sources/KSCrashRecordingCore`, `Sources/KSCrashBootTimeMonitor`, or `Sources/KSCrashDiscSpaceMonitor`.

Security AStatic scan found no risk patternsHow grading works ›

About this skill (catalog notes)

Async Signal Safety Review includes at least one code block. The SKILL.md runs to about 1,166 words, in the catalog's typical mid-range.

Indexed lastmod: 2026-05-21
Catalog position: General · general-misc
Indexed related skills: 10

How Async Signal Safety Review fits the catalog

Async Signal Safety Review sits in the General category under the general-misc sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.

These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.

From the source SKILL.md

Scope is strict: async-signal-safety and crash-time correctness only. This is NOT a general PR review. You are not evaluating whether the PR should land, whether the design is good, whether doc comments read well, whether names are clear, whether tests exist, or whether refactors are worthwhile. You are answering exactly one question per changed line: does this break async-signal-safety on the signal-handler path?

What this skill does

Async Signal Safety Review is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/async-signal-safety-review/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user asks to review a diff/branch/PR/file for signal safety, or before landing changes that touch signal handlers, Mach exception handlers, or anything reachable from `Sources/KSCrashRecording`, `Sources/KSCrashRecordingCore`, `Sources/KSCrashBootTimeMonitor`, or `Sources/KSCrashDiscSpaceMonitor`.

Who uses this skill

The Async Signal Safety Review Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 115,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/async-signal-safety-review
curl -L https://claudskills.com/skills/async-signal-safety-review/SKILL.md \
  -o ~/.claude/skills/async-signal-safety-review/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/async-signal-safety-review/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/async-signal-safety-review/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\async-signal-safety-review\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Async Signal Safety Review Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/async-signal-safety-review/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Async Signal Safety Review skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Async Signal Safety Review skill?

Use Async Signal Safety Review when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Async Signal Safety Review" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Async Signal Safety Review skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Async Signal Safety Review is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). Async Signal Safety Review [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/async-signal-safety-review/

BibTeX

@misc{async-signal-safety-review-2026,
  author    = {ClaudSkills},
  title     = {Async Signal Safety Review [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/async-signal-safety-review/}
}

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Security scan

Grade A · scanned 2026-06-13 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/async-signal-safety-review/#security)

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