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write-swift

write-swift is a skill for Claude Code, Codex from arhen/agents. It costs 107 tokens per session (9,313 once invoked), scanned A, original, no licence file.

A guide to writing modern Swift, Apple's programming language for apps and other software. It covers data-safe concurrent code, types, protocols, generics, API design, performance, testing, macros, and newer language features.

In plain words
What is it for?
Use it when designing or reviewing Swift code, including concurrent programs, public APIs, tests, and performance-sensitive code.
Why use it?
Swift has detailed rules for concurrency, memory management, and type design that are easy to apply incorrectly. The guide helps an agent use current Swift patterns rather than outdated ones.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

not rated 13repo +1 yesterday A scan 107 tokens no licence

Good fit Use it when designing or reviewing Swift code, including concurrent programs, public APIs, tests, and performance-sensitive code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/arhen/agents/write-swift
View source ↗ arhen/agents
Install

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.

Any agent
npx skills add arhen/agents --skill write-swift
Clone the repo
git clone --depth 1 https://github.com/arhen/agents

Made for: Claude Code, Codex.

Wrote 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.

agentmods badge for write-swift

README.md
[![agentmods](https://agentmods.dev/badge/skills/arhen/agents/write-swift/github.svg)](https://agentmods.dev/skills/arhen/agents/write-swift)
Your own site
<a href="https://agentmods.dev/skills/arhen/agents/write-swift"><img src="https://agentmods.dev/badge/skills/arhen/agents/write-swift/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.

agentmods 80×15 button for write-swift

Your own site · 80×15
<a href="https://agentmods.dev/skills/arhen/agents/write-swift"><img src="https://agentmods.dev/badge/skills/arhen/agents/write-swift.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 107 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 9,313 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00107 $0.09313
Opus 5.5 $0.00043 $0.03725
Sonnet 5.5 $0.00021 $0.01863
Haiku 4.5 $0.00011 $0.00931

Measured 9d ago against content hash 16a4b6adb74e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

write-swift 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 9d 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.

skills/write-swift/SKILL.md · 397 lines

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.

Read it on GitHub

Changes

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.

  1. 9d ago First seen · 397 lines · 107 tokens per session scan A 16a4b6adb74e

Subscribe to this mod's changes

write-swift is a skill published in the GitHub repository arhen/agents (13 stars, last pushed yesterday), with no licence file. It adds 107 tokens to every session and 9,313 once invoked, about $0.0004 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 2026-10-29.

Kotlin and SwiftLanguages
Related

write-swift compared with skills from other repositories

write-swift next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
write-swiftarhen/agentsSkill13yesterdaynoneA107Claude Code, Codex
ink-custom-brush-builderandroid/skillsSkill10k2d agoApache-2.0A159Claude Code
kotlin-specialistJeffallan/claude-skillsSkill12k8d agoMITA86Claude Code
swiftui-devOrkas-AI/OrkasSkill9.1ktodayMITA3Claude Code, Codex
axiom-concurrencyCharlesWiltgen/AxiomSkill1.3kyesterdayMITA49Claude Code
boutique-best-practicesmergesort/BoutiqueSkill1.1k5d agoMITA56Claude Code
waxchristopherkarani/WaxSkill8073d agoApache-2.0A76Codex