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 xiaohei-info/oh-my-multica --skill software-design-philosophygit clone --depth 1 https://github.com/xiaohei-info/oh-my-multicaWrote 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/xiaohei-info/oh-my-multica/software-design-philosophy)<a href="https://agentmods.dev/skills/xiaohei-info/oh-my-multica/software-design-philosophy"><img src="https://agentmods.dev/badge/skills/xiaohei-info/oh-my-multica/software-design-philosophy/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/xiaohei-info/oh-my-multica/software-design-philosophy"><img src="https://agentmods.dev/badge/skills/xiaohei-info/oh-my-multica/software-design-philosophy.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- 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 | $0.00125 | $0.04072 |
| Opus 5 | $0.00063 | $0.02036 |
| Sonnet 5 | $0.00025 | $0.00814 |
| Haiku 4.5 | $0.00013 | $0.00407 |
Grade A, and why
software-design-philosophy 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 12d 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 — 232 lines — stays where its author put it; the contents beside it link to each section on GitHub.
A Philosophy of Software Design Framework
A practical framework for managing the fundamental challenge of software engineering: complexity. Apply these principles when designing modules, reviewing APIs, refactoring code, or advising on architecture decisions. The central thesis is that complexity is the root cause of most software problems, and managing it requires deliberate, strategic thinking at every level of design.
Core Principle
The greatest limitation in writing software is our ability to understand the systems we are creating. Complexity is the enemy. It makes systems hard to understand, hard to modify, and a source of bugs. Every design decision should be evaluated by asking: "Does this increase or decrease the overall complexity of the system?" The goal is not zero complexity -- that is impossible in useful software -- but to minimize unnecessary complexity and concentrate necessary complexity where it can be managed.
Scoring
Goal: 10/10. When reviewing or creating software designs, rate them 0-10 based on adherence to the principles below. A 10/10 means deep modules with clean abstractions, excellent information hiding, strategic thinking about complexity, and comments that capture design intent. Lower scores indicate shallow modules, information leakage, tactical shortcuts, or missing design documentation. Always provide the current score and specific improvements needed to reach 10/10.
The Software Design Framework
Six principles for managing complexity and producing systems that are easy to understand and modify:
1. Complexity and Its Causes
Core concept: Complexity is anything related to the structure of a software system that makes it hard to understand and modify. It manifests through three symptoms: change amplification, cognitive load, and unknown unknowns.
Why it works: By identifying the specific symptoms of complexity, developers can diagnose problems precisely rather than relying on vague notions of "messy code." The two fundamental causes -- dependencies and obscurity -- provide clear targets for design improvement.
What ships with it
6 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.
- 12d ago First seen · 232 lines · 125 tokens per session scan A 1cf9f2969b1e
software-design-philosophy is a skill published in the GitHub repository xiaohei-info/oh-my-multica (26 stars, last pushed 4d ago), licensed MIT. It adds 125 tokens to every session and 4,072 once invoked, about $0.0006 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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