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 skills/matrixfounder/agentic-development/architecture-designnpx skills add MatrixFounder/Agentic-development --skill architecture-designgit clone --depth 1 https://github.com/MatrixFounder/Agentic-developmentWhat 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 | $0.00013 | $0.00562 |
| Opus 5 | $0.00006 | $0.00281 |
| Sonnet 5 | $0.00003 | $0.00112 |
| Haiku 4.5 | $0.00001 | $0.00056 |
Grade A, and why
architecture-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 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.
How it starts
The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Architecture Design
1. Core Principles
Simplicity Above All
- Goal: Solve the task maximally simply.
- Avoid Overengineering: Complex architecture and heavy libraries complicate maintenance.
- Zero-Dependency: Add only truly necessary components.
- No-ORM Preference: Do not use ORM if simple SQL queries are easier.
- Frameworks: Do not use frameworks if API is easier on lower-level libraries.
Modularity
- Loose coupling, high cohesion.
- Clear interface definitions between components.
Common Patterns
If building a complex system, refer to these standard patterns:
- Clean Architecture:
references/clean_architecture.md(Layers, Dependency Rule). - Event-Driven:
references/event_driven.md(Async, Brokers, Idempotency).
2. Requirements for Architecture Components
Data Model
- Design Detailedly:
- All entities, attributes with types.
- All relationships (1:1, 1:N, M:N).
- All constraints and indexes.
- Think about Migrations:
- How data will migrate with changes.
- Backward compatibility.
- Consider Performance:
- Frequent queries -> Indexes.
- Denormalization if necessary.
Security
- Built-in: Security must be designed, not patched.
- Auth: OAuth2/JWT/Session strategies defined.
- Protection: OWASP Top 10 consideration.
Scalability
- Horizontal: Stateless services.
- Database: Partitioning, Replication strategies.
3. Important Rules
✅ DO:
- Base on TASK: Justify every decision by requirements from TASK.
- Consider Existing: Structure new components to fit existing patterns.
- Be Specific: Indicate specific technologies (e.g., "PostgreSQL 14"), not just "SQL DB".
- Link to Use Cases: Map components to the UC they fulfill.
❌ DO NOT:
- Write Code: You design architecture, not implementation.
- Ignore Legacy: Study existing project before designing.
- Leave Decisions for Later: Key technologies must be selected now.
- Accumulate Debt: If refactoring is needed, record it.
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.
- 2d ago First seen · 69 lines · 13 tokens per session scan A 60718c6bbf39
architecture-design is a skill published in the GitHub repository MatrixFounder/Agentic-development (5 stars, last pushed 20d ago), licensed Apache-2.0. It adds 13 tokens to every session and 562 once invoked, about $0.0001 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 2026-08-31.
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