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 hackermanishackerman/claude-skills-vault --skill system-architectgit clone --depth 1 https://github.com/hackermanishackerman/claude-skills-vaultWrote 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/hackermanishackerman/claude-skills-vault/system-architect)<a href="https://agentmods.dev/skills/hackermanishackerman/claude-skills-vault/system-architect"><img src="https://agentmods.dev/badge/skills/hackermanishackerman/claude-skills-vault/system-architect/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/hackermanishackerman/claude-skills-vault/system-architect"><img src="https://agentmods.dev/badge/skills/hackermanishackerman/claude-skills-vault/system-architect.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 | $0.00038 | $0.01227 |
| Opus 5.5 | $0.00015 | $0.00491 |
| Sonnet 5.5 | $0.00008 | $0.00245 |
| Haiku 4.5 | $0.00004 | $0.00123 |
Grade A, and why
system-architect 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.
This is a copy
100% identical to system-architect — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 202 lines — stays where its author put it; the contents beside it link to each section on GitHub.
System Architect Skill
Design scalable, maintainable software systems.
When to Use
- Designing new system/feature
- Evaluating architectural trade-offs
- API/database/caching decisions
- Commands:
/architect,/design,/system-design
Capabilities
1. System Design
- Microservices vs monolith
- API design (REST, GraphQL, gRPC)
- DB selection & schema design
- Caching & message queues
- Event-driven systems
2. Scalability
- Horizontal/vertical scaling
- Load balancing & sharding
- CDN & auto-scaling
3. Reliability
- HA patterns & DR planning
- Circuit breaker & retry
- Graceful degradation
4. Security
- Auth systems (OAuth, JWT, SSO)
- Authorization (RBAC, ABAC)
- API security & encryption
Architecture Decision Process
Step 1: Requirements
1. Functional: Core features, workflows, integrations
2. Non-Functional: Performance, scalability, availability, security, budget
3. Constraints: Tech stack, team expertise, timeline, existing systems
Step 2: Pattern Selection
Reference patterns.json for patterns, tech recommendations, trade-offs.
Step 3: Design Doc Template
# Architecture Design Document
## 1. Overview
[High-level description]
## 2. Goals & Non-Goals
## 3. Architecture
### System Diagram
### Components
| Component | Responsibility | Technology |
|-----------|---------------|------------|
### Data Flow
## 4. Technical Decisions
### Decision 1: [Title]
- Context | Options | Decision | Rationale
## 5. API Design
## 6. Data Model
## 7. Security
## 8. Scalability
## 9. Monitoring & Observability
## 10. Risks & Mitigations
Pattern Reference
Communication
| Pattern | Use When | Trade-offs |
|---|---|---|
| Sync REST | Simple CRUD | Tight coupling |
| Async Queue | Decoupling | Complexity |
| Event Sourcing | Audit trail | Storage |
| CQRS | Read/write opt | Eventual consistency |
| GraphQL | Flexible queries | Caching |
| gRPC | High perf | Browser support |
What ships with it
2 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.
- 1mo ago First seen · 202 lines · 38 tokens per session scan A 15299b0d0a92
system-architect is a skill published in the GitHub repository hackermanishackerman/claude-skills-vault (2 stars, last pushed 15d ago), licensed MIT. It adds 38 tokens to every session and 1,227 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to system-architect, differing in 0 lines, and is treated as a copy.
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