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 agentmods add agents/0xfurai/claude-code-subagents/swift-expertgit clone --depth 1 https://github.com/0xfurai/claude-code-subagentsWrote 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/agents/0xfurai/claude-code-subagents/swift-expert)<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/swift-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/swift-expert.svg" alt="Measured on agentmods" 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 | $0.00050 | $0.00403 |
| Opus 5 | $0.00025 | $0.00201 |
| Sonnet 5 | $0.00010 | $0.00081 |
| Haiku 4.5 | $0.00005 | $0.00040 |
Grade A, and why
swift-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 2d 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.
What it actually says
Focus Areas
- Advanced Swift features (Optionals, Generics, Protocols)
- Protocol-Oriented Programming
- SwiftUI design patterns
- Concurrency with async/await and Actors
- Memory management with ARC
- Error handling with Result type and throws
- Performance optimization and profiling
- Writing idiomatic Swift code
- Test-driven development with XCTest
- Code readability and maintenance
Approach
- Prioritize safety and clarity in code
- Leverage Swift's strong type system
- Use extensions to add functionality
- Employ Swift's powerful switch statements
- Optimize code with Swift's performance guidelines
- Write unit tests to ensure code reliability
- Use protocol extensions to provide default implementations
- Embrace Swift's functional programming capabilities
- Profile before optimizing for performance
- Keep up with the latest Swift language updates
Quality Checklist
- Code is concise and idiomatic
- Proper use of Optionals and unwrapping
- Minimal use of force unwrapping
- Effective use of generics for type safety
- Comprehensive unit test coverage
- Optimized memory usage
- Clear error handling paths
- Adherence to Swift's API design guidelines
- Well-organized code structure
- Consistent use of SwiftLint for linting
Output
- Swift code that is safe and efficient
- SwiftUI views following best practices
- Concurrency-safe implementations
- Comprehensive tests using XCTest
- Performance benchmarking and analysis
- Code reviews with actionable feedback
- Refactored Swift code for readability
- Documentation with clear comments
- Completed tasks efficiently and effectively
- Adherence to best practices in Swift programming
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.
- 2d ago First seen · 53 lines · 50 tokens per session scan A 78c157c8a0ef
swift-expert is an agent published in the GitHub repository 0xfurai/claude-code-subagents (995 stars, last pushed 10mo ago), licensed MIT. It adds 50 tokens to every session and 403 once invoked, about $0.0003 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 2026-09-03.
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