AvdLee/SwiftUI-Agent-Skill is a portable set of expert guidance for AI coding tools that work with SwiftUI, Apple’s framework for building app interfaces. It helps teams and developers review, refactor, and write SwiftUI code involving state, view structure, performance, and newer visual APIs. The catalogue entries provide the skill and plugin instructions that agents use to apply this guidance.
Borrowing it
Nothing to install: this file belongs to AvdLee/SwiftUI-Agent-Skill. 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/AvdLee/SwiftUI-Agent-Skill/main/.github/copilot-instructions.mdgit clone --depth 1 https://github.com/AvdLee/SwiftUI-Agent-SkillWrote 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/instructions/avdlee/swiftui-agent-skill/copilot-instructions)<a href="https://agentmods.dev/instructions/avdlee/swiftui-agent-skill/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/avdlee/swiftui-agent-skill/copilot-instructions/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/instructions/avdlee/swiftui-agent-skill/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/avdlee/swiftui-agent-skill/copilot-instructions.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 | $0.01257 | $0.01257 |
| Opus 5.5 | $0.00503 | $0.00503 |
| Sonnet 5.5 | $0.00251 | $0.00251 |
| Haiku 4.5 | $0.00126 | $0.00126 |
Grade A, and why
SwiftUI-Agent-Skill copilot-instructions.md 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 1mo 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 — 87 lines — stays where its author put it; the contents beside it link to each section on GitHub.
GitHub Copilot Instructions: Agent Skills Expert (SwiftUI)
Review changes as an Agent Skills expert, focusing on the Agent Skills open format specification and ensuring this repository stays a SwiftUI-focused, non-architectural, modern-API skill.
Core Agent Skills Principles
Format Compliance
SKILL.mdrequired: Every skill directory must contain aSKILL.mdwith YAML frontmatter.- YAML frontmatter requirements:
name: non-empty, <= 64 chars, lowercase letters/numbers/hyphens only.description: non-empty, <= 1024 chars, clearly states what the skill does and when to use it.
- Progressive disclosure: keep
SKILL.mdas the primary entrypoint; move deep dives intoskills/swiftui-expert-skill/references/. - Filesystem-based design: content should be organized so agents can load only what they need (metadata → instructions → references).
Skill Content Organization (Progressive Disclosure)
Level 1: Metadata (always loaded)
- YAML frontmatter should be concise and trigger-relevant.
Level 2: Instructions (loaded when triggered)
skills/swiftui-expert-skill/SKILL.mdbody should contain workflows, checklists, decision trees, and quick references.- Avoid turning
SKILL.mdinto an encyclopedia; prefer linking out to references.
Level 3: Resources (loaded as needed)
- Topic-specific guidance lives in
skills/swiftui-expert-skill/references/*.md. - References should be linked from
SKILL.mdso agents discover them naturally.
SwiftUI Repository Constraints (Keep This Skill “On Mission”)
- SwiftUI-only: avoid UIKit patterns unless bridging is strictly necessary, and avoid server-side Swift.
- No architecture mandates: do not prescribe MVVM/MVC/VIPER/coordinators/routers or project folder structures.
- No tooling instructions: avoid IDE/tool walkthroughs. (Mentioning that profiling exists is fine; don’t give step-by-step tool instructions.)
- Modern SwiftUI APIs: prefer modern, non-deprecated APIs where correctness is impacted (e.g.,
NavigationStack,foregroundStyle()). - Performance guidance is optional: performance optimizations should be phrased as “consider” unless it’s a correctness issue.
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.
- 1mo ago First seen · 87 lines · 1,257 tokens per session scan A 9923821bd2db
SwiftUI-Agent-Skill copilot-instructions.md is an instructions file published in the GitHub repository AvdLee/SwiftUI-Agent-Skill (3,773 stars, last pushed 21d ago), licensed MIT. It adds 1,257 tokens to every session, about $0.0050 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.
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