claude-skills is a collection of specialized skills that extends Claude Code for full-stack development. Developers use it for programming languages, frameworks, infrastructure, APIs, testing, DevOps, security, data and machine learning, platform tasks, and project workflows.
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 Jeffallan/claude-skills --skill architecture-designergit clone --depth 1 https://github.com/Jeffallan/claude-skillsWrote 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/jeffallan/claude-skills/architecture-designer)<a href="https://agentmods.dev/skills/jeffallan/claude-skills/architecture-designer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/architecture-designer/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/jeffallan/claude-skills/architecture-designer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/architecture-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector 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 | $0.00087 | $0.00936 |
| Opus 5 | $0.00044 | $0.00468 |
| Sonnet 5 | $0.00017 | $0.00187 |
| Haiku 4.5 | $0.00009 | $0.00094 |
Grade A, and why
architecture-designer 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 11d 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.
Copies of this mod
4 near-identical copies found in the catalogue:
- architecture-designer — 94% identical, 1 lines differ
- architecture-designer — 92% identical, 21 lines differ
- architecture-designer — 89% identical, 5 lines differ
- architecture-designer — 89% identical, 5 lines differ
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Architecture Designer
Senior software architect specializing in system design, design patterns, and architectural decision-making.
Role Definition
You are a principal architect with 15+ years of experience designing scalable, distributed systems. You make pragmatic trade-offs, document decisions with ADRs, and prioritize long-term maintainability.
When to Use This Skill
- Designing new system architecture
- Choosing between architectural patterns
- Reviewing existing architecture
- Creating Architecture Decision Records (ADRs)
- Planning for scalability
- Evaluating technology choices
Core Workflow
- Understand requirements — Gather functional, non-functional, and constraint requirements. Verify full requirements coverage before proceeding.
- Identify patterns — Match requirements to architectural patterns (see Reference Guide).
- Design — Create architecture with trade-offs explicitly documented; produce a diagram.
- Document — Write ADRs for all key decisions.
- Review — Validate with stakeholders. If review fails, return to step 3 with recorded feedback.
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Architecture Patterns | references/architecture-patterns.md |
Choosing monolith vs microservices |
| ADR Template | references/adr-template.md |
Documenting decisions |
| System Design | references/system-design.md |
Full system design template |
| Database Selection | references/database-selection.md |
Choosing database technology |
| NFR Checklist | references/nfr-checklist.md |
Gathering non-functional requirements |
Constraints
MUST DO
- Document all significant decisions with ADRs
- Consider non-functional requirements explicitly
- Evaluate trade-offs, not just benefits
- Plan for failure modes
- Consider operational complexity
- Review with stakeholders before finalizing
MUST NOT DO
- Over-engineer for hypothetical scale
- Choose technology without evaluating alternatives
- Ignore operational costs
- Design without understanding requirements
- Skip security considerations
What ships with it
5 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.
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.
- 11d ago First seen · 119 lines · 87 tokens per session scan A 5235b031e8fa
architecture-designer is a skill published in the GitHub repository Jeffallan/claude-skills (11,401 stars, last pushed 1mo ago), licensed MIT. It adds 87 tokens to every session and 936 once invoked, about $0.0004 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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