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 ivan-magda/swift-security-skill --skill swift-security-expertgit clone --depth 1 https://github.com/ivan-magda/swift-security-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/skills/ivan-magda/swift-security-skill/swift-security-expert)<a href="https://agentmods.dev/skills/ivan-magda/swift-security-skill/swift-security-expert"><img src="https://agentmods.dev/badge/skills/ivan-magda/swift-security-skill/swift-security-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/ivan-magda/swift-security-skill/swift-security-expert"><img src="https://agentmods.dev/badge/skills/ivan-magda/swift-security-skill/swift-security-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
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 | $0.00122 | $0.10310 |
| Opus 5 | $0.00061 | $0.05155 |
| Sonnet 5 | $0.00024 | $0.02062 |
| Haiku 4.5 | $0.00012 | $0.01031 |
Grade A, and why
swift-security-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 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.
How it starts
The opening of the file, as written. The whole thing — 471 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Keychain & Security Expert Skill
Philosophy: Non-opinionated, correctness-focused. This skill provides facts, verified patterns, and Apple-documented best practices — not architecture mandates. It covers iOS 13+ as a minimum deployment target, with modern recommendations targeting iOS 17+ and forward-looking guidance through iOS 26 (post-quantum). Every code pattern is grounded in Apple documentation, DTS engineer posts (Quinn "The Eskimo!"), WWDC sessions, and OWASP MASTG — never from memory alone.
What this skill is: A reference for reviewing, improving, and implementing keychain operations, biometric authentication, CryptoKit cryptography, credential lifecycle management, certificate trust, and compliance mapping on Apple platforms.
What this skill is not: A networking guide, a server-side security reference, or an App Transport Security manual. TLS configuration, server certificate management, and backend auth architecture are out of scope except where they directly touch client-side keychain or trust APIs.
Decision Tree
Determine the user's intent, then follow the matching branch. If ambiguous, ask.
┌─────────────────────┐
│ What is the task? │
└─────────┬───────────┘
┌──────────────────┼──────────────────┐
▼ ▼ ▼
┌─────────┐ ┌───────────┐ ┌────────────┐
│ REVIEW │ │ IMPROVE │ │ IMPLEMENT │
│ │ │ │ │ │
│ Audit │ │ Migrate / │ │ Build from │
│ existing│ │ modernize │ │ scratch │
│ code │ │ existing │ │ │
└────┬────┘ └─────┬─────┘ └─────┬──────┘
│ │ │
▼ ▼ ▼
Run Top-Level Identify gap Identify which
Review Checklist (legacy store? domain(s) apply,
(§ below) against wrong API? load reference
the code. missing auth?) file(s), follow
Flag each item Load migration + ✅ patterns.
as ✅ / ❌ / domain-specific Implement with
⚠️ N/A. reference files. add-or-update,
For each ❌, Follow ✅ patterns, proper error
cite the verify with domain handling, and
reference file checklist. correct access
and specific control from
section. the start.
What ships with it
14 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/biometric-authentication.md 26 KB
- references/certificate-trust.md 30 KB
- references/common-anti-patterns.md 30 KB
- references/compliance-owasp-mapping.md 36 KB
- references/credential-storage-patterns.md 41 KB
- references/cryptokit-public-key.md 32 KB
- references/cryptokit-symmetric.md 27 KB
- references/keychain-access-control.md 30 KB
- references/keychain-fundamentals.md 29 KB
- references/keychain-item-classes.md 30 KB
- references/keychain-sharing.md 30 KB
- references/migration-legacy-stores.md 36 KB
- references/secure-enclave.md 31 KB
- references/testing-security-code.md 33 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.
- 9d ago First seen · 471 lines · 122 tokens per session scan A a915770a1a86
swift-security-expert is a skill published in the GitHub repository ivan-magda/swift-security-skill (32 stars, last pushed 2mo ago), licensed MIT. It adds 122 tokens to every session and 10,310 once invoked, about $0.0006 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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