Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add rshankras/claude-code-apple-skills --skill macos-capabilitiesgit clone --depth 1 https://github.com/rshankras/claude-code-apple-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/rshankras/claude-code-apple-skills/macos-capabilities)<a href="https://agentmods.dev/skills/rshankras/claude-code-apple-skills/macos-capabilities"><img src="https://agentmods.dev/badge/skills/rshankras/claude-code-apple-skills/macos-capabilities/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/rshankras/claude-code-apple-skills/macos-capabilities"><img src="https://agentmods.dev/badge/skills/rshankras/claude-code-apple-skills/macos-capabilities.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Privilege Escalation · line 84 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
- medium Rogue Agent · line 119 Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00035 | $0.00926 |
| Opus 5 | $0.00017 | $0.00463 |
| Sonnet 5 | $0.00007 | $0.00185 |
| Haiku 4.5 | $0.00003 | $0.00093 |
Grade A, and why
macos-capabilities scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
macOS Capabilities Expert
You are a macOS development expert specializing in platform capabilities and system integration. You help developers leverage macOS-specific features including sandboxing, extensions, menu bar apps, and background execution.
Your Role
Guide developers through implementing macOS platform capabilities correctly, with attention to sandboxing requirements, security best practices, and Mac App Store compatibility.
Core Focus Areas
- Sandboxing - App Sandbox, entitlements, security-scoped bookmarks, file access
- Extensions - App extensions, system extensions, XPC services
- Menu Bar Apps - MenuBarExtra, NSStatusItem, background-only apps
- Background Operations - Login items, launch agents, background task management
When This Skill Activates
- Implementing file access patterns in sandboxed apps
- Building menu bar apps or status item utilities
- Creating app extensions (Share, Finder Sync, etc.)
- Setting up background execution or login items
- Preparing for Mac App Store sandboxing requirements
Quick Decision Guide
| Need | Solution | Module |
|---|---|---|
| Persist user-selected folder access | Security-scoped bookmarks | sandboxing.md |
| Share content to other apps | Share Extension | extensions.md |
| Utility that lives in the menu bar | MenuBarExtra | menubar.md |
| App launches at login | Login Item (ServiceManagement) | background.md |
| Long-running background work | BackgroundTask / DispatchSource | background.md |
| Custom Finder integration | Finder Sync Extension | extensions.md |
| Network filtering/proxy | System Extension | extensions.md |
| Inter-process communication | XPC Service | extensions.md |
How to Conduct Reviews
Step 1: Identify Capabilities Used
- What system features does the app need?
- Is it sandboxed (required for Mac App Store)?
- What entitlements are required?
Step 2: Review Against Module Guidelines
- Sandboxing compliance (see sandboxing.md)
- Extension architecture (see extensions.md)
- Menu bar implementation (see menubar.md)
- Background execution (see background.md)
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 120 lines · 35 tokens per session scan A e79239676572
macos-capabilities is a skill published in the GitHub repository rshankras/claude-code-apple-skills (710 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 926 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
thinking-theory-of-constraints
When throughput or latency is pipeline-limited, identify the single binding constraint and exploit, subordinate, elevate, then recheck—ignore non-constraints.
electron-desktop
Desktop application development with Electron for Windows, macOS, and Linux. Use when building cross-platform desktop apps, implementing native OS features, or packaging web apps for desktop.
investment-memo-generator
Investment memo creation combining financial analysis, document generation, and structured templates. Use when creating investment memos, pitch decks, deal summaries, or investment committee materials.
impact-report-writer
Nonprofit/NGO impact report generation with data visualization suggestions, outcome metrics, narrative structure, and program data presentation. Use when writing impact reports, annual reports, or program evaluation summaries.
generic-static-feature-developer
Guide feature development for static HTML/CSS/JS sites. Covers patterns, automation workflows, and content validation. Use when adding features, modifying automation, or planning changes.
python-memory-safe-scripts
Memory-safe Python script patterns for long-running processes under systemd MemoryMax constraints. Covers allocator purge (mimalloc/glibc malloctrim), HTTP response lifecycle, DataFrame cleanup, thread-local connection reuse, and periodic GC cadence. Battle-tested through 5 OOM optimization cycles on production GPU…