Borrowing it
Nothing to install: this file belongs to harperreed/dotfiles. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/harperreed/dotfiles/master/.claude/skills/swift-concurrency-expert/SKILL.mdgit clone --depth 1 https://github.com/harperreed/dotfilesWrote 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/harperreed/dotfiles/swift-concurrency-expert)<a href="https://agentmods.dev/skills/harperreed/dotfiles/swift-concurrency-expert"><img src="https://agentmods.dev/badge/skills/harperreed/dotfiles/swift-concurrency-expert/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/harperreed/dotfiles/swift-concurrency-expert"><img src="https://agentmods.dev/badge/skills/harperreed/dotfiles/swift-concurrency-expert.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 | $0.00045 | $0.00445 |
| Opus 5.5 | $0.00018 | $0.00178 |
| Sonnet 5.5 | $0.00009 | $0.00089 |
| Haiku 4.5 | $0.00005 | $0.00044 |
Grade A, and why
swift-concurrency-expert 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 2mo 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.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
2 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.
- 2mo ago First seen · 38 lines · 45 tokens per session scan A d833bf05f64a
swift-concurrency-expert is a skill published in the GitHub repository harperreed/dotfiles (336 stars, last pushed 8d ago), with no licence file. It adds 45 tokens to every session and 445 once invoked, about $0.0002 per session on Opus 5.5. 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.
swift-concurrency-expert compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| swift-concurrency-expertharperreed/dotfiles | Skill | 336 | 8d ago | none | A | 45 | Claude Code |
| macos-patternsfreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 159 | Claude Code, Codex |
| coding-best-practicesfreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 45 | Claude Code |
| appkit-swiftui-bridgefreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 44 | Claude Code |
| macos-app-designfreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 72 | Claude Code, Codex |
| macos-developmentfreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 54 | Claude Code |
| macos-tahoe-apisfreekmurze/dotfiles | Skill | 1.0k | 19d ago | none | A | 44 | Claude Code |