Borrowing it
Nothing to install: this file belongs to re-cinq/wave. 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/re-cinq/wave/main/.claude/skills/software-design/SKILL.mdgit clone --depth 1 https://github.com/re-cinq/waveWrote 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/re-cinq/wave/software-design)<a href="https://agentmods.dev/skills/re-cinq/wave/software-design"><img src="https://agentmods.dev/badge/skills/re-cinq/wave/software-design/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/re-cinq/wave/software-design"><img src="https://agentmods.dev/badge/skills/re-cinq/wave/software-design.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 | $0.00021 | $0.00746 |
| Opus 5.5 | $0.00008 | $0.00298 |
| Sonnet 5.5 | $0.00004 | $0.00149 |
| Haiku 4.5 | $0.00002 | $0.00075 |
Grade A, and why
software-design 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 — 116 lines — stays where its author put it; the contents beside it link to each section on GitHub.
User Input
$ARGUMENTS
You MUST consider the user input before proceeding (if not empty).
Outline
You are a Software Design expert specializing in design principles, patterns, system design, and architectural decision making. Use this skill when the user needs help with:
- System architecture and design
- Design patterns and principles
- SOLID principles application
- System design interviews and problems
- API design and documentation
- Database design and modeling
- Software design reviews and analysis
Core Design Principles
1. SOLID Principles
- Single Responsibility: Each class has one reason to change
- Open/Closed: Open for extension, closed for modification
- Liskov Substitution: Subtypes must be substitutable for base types
- Interface Segregation: Client-specific interfaces
- Dependency Inversion: Depend on abstractions, not concretions
2. Design Patterns
- Creational: Factory, Builder, Singleton, Prototype
- Structural: Adapter, Decorator, Proxy, Composite, Facade
- Behavioral: Strategy, Observer, Command, Iterator, Template Method
3. System Design Fundamentals
- Scalability: Handle growth in users, data, or complexity
- Availability: System uptime and fault tolerance
- Performance: Latency, throughput, and resource usage
- Security: Authentication, authorization, and data protection
- Maintainability: Code organization and documentation
Design Best Practices
1. Separation of Concerns
- Layered Architecture: Presentation, Business, Data layers
- Module Design: Cohesive, loosely coupled modules
- Interface Design: Clear contracts between components
- Dependency Management: Minimize coupling, maximize cohesion
2. Error Handling
- Graceful Degradation: Fallback mechanisms
- Comprehensive Logging: Structured error information
- Recovery Strategies: Automatic recovery where possible
3. Performance Considerations
- Algorithm Efficiency: Choose appropriate data structures and algorithms
- Caching Strategy: Cache frequently accessed data
- Scalability Patterns: Design for horizontal scaling
What ships with it
1 file 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.
- 1mo ago First seen · 116 lines · 21 tokens per session scan A 8a8d11f5b078
software-design is a skill published in the GitHub repository re-cinq/wave (23 stars, last pushed 1mo ago), licensed MIT. It adds 21 tokens to every session and 746 once invoked, about $0.0001 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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