Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/ckorhonen/claude-skillsnpx agentmods add skills/ckorhonen/claude-skills/macos-appsWrote 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/ckorhonen/claude-skills/macos-apps)<a href="https://agentmods.dev/skills/ckorhonen/claude-skills/macos-apps"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/macos-apps/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/ckorhonen/claude-skills/macos-apps"><img src="https://agentmods.dev/badge/skills/ckorhonen/claude-skills/macos-apps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00093 | $0.01561 |
| Opus 5 | $0.00046 | $0.00781 |
| Sonnet 5 | $0.00019 | $0.00312 |
| Haiku 4.5 | $0.00009 | $0.00156 |
Grade A, and why
macos-apps 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 12d 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 — 173 lines — stays where its author put it; the contents beside it link to each section on GitHub.
How We Work
The user is the product owner. Claude is the developer.
The user does not write code. The user does not read code. The user describes what they want and judges whether the result is acceptable. Claude implements, verifies, and reports outcomes.
1. Prove, Don't Promise
Never say "this should work." Prove it:
xcodebuild build 2>&1 | xcsift # Build passes
xcodebuild test # Tests pass
open .../App.app # App launches
If you didn't run it, you don't know it works.
2. Tests for Correctness, Eyes for Quality
| Question | How to Answer |
|---|---|
| Does the logic work? | Write test, see it pass |
| Does it look right? | Launch app, user looks at it |
| Does it feel right? | User uses it |
| Does it crash? | Test + launch |
| Is it fast enough? | Profiler |
Tests verify correctness. The user verifies desirability.
3. Report Outcomes, Not Code
Bad: "I refactored DataService to use async/await with weak self capture"
Good: "Fixed the memory leak. leaks now shows 0 leaks. App tested stable for 5 minutes."
The user doesn't care what you changed. The user cares what's different.
4. Small Steps, Always Verified
Change → Verify → Report → Next change
Never batch up work. Never say "I made several changes." Each change is verified before the next. If something breaks, you know exactly what caused it.
5. Ask Before, Not After
Unclear requirement? Ask now. Multiple valid approaches? Ask which. Scope creep? Ask if wanted. Big refactor needed? Ask permission.
Wrong: Build for 30 minutes, then "is this what you wanted?" Right: "Before I start, does X mean Y or Z?"
6. Always Leave It Working
Every stopping point = working state. Tests pass, app launches, changes committed. The user can walk away anytime and come back to something that works.
Intake
Ask the user:
What would you like to do?
- Build a new app
- Debug an existing app
- Add a feature
- Write/run tests
- Optimize performance
- Ship/release
- Something else
What ships with it
26 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.
- references/app-architecture.md 15 KB
- references/app-extensions.md 13 KB
- references/appkit-integration.md 13 KB
- references/cli-observability.md 7.7 KB
- references/cli-workflow.md 13 KB
- references/common-pitfalls.md 14 KB
- references/concurrency-patterns.md 12 KB
- references/data-persistence.md 17 KB
- references/design-system.md 11 KB
- references/document-apps.md 12 KB
- references/macos-polish.md 14 KB
- references/menu-bar-apps.md 9.6 KB
- references/networking.md 15 KB
- references/project-scaffolding.md 13 KB
- references/security-code-signing.md 14 KB
- references/shoebox-apps.md 13 KB
- references/swiftui-patterns.md 23 KB
- references/system-apis.md 14 KB
- references/testing-debugging.md 14 KB
- references/testing-tdd.md 5.6 KB
- workflows/add-feature.md 3.3 KB
- workflows/build-new-app.md 2.6 KB
- workflows/debug-app.md 5.5 KB
- workflows/optimize-performance.md 5.0 KB
- workflows/ship-app.md 3.9 KB
- workflows/write-tests.md 5.5 KB
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.
- 12d ago First seen · 173 lines · 93 tokens per session scan A 2f0233317ab9
macos-apps is a skill published in the GitHub repository ckorhonen/claude-skills (14 stars, last pushed 2mo ago), licensed MIT. It adds 93 tokens to every session and 1,561 once invoked, about $0.0005 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 2026-08-30.
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