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/eser/rules/design-principlesnpx skills add eser/rules --skill design-principlesgit clone --depth 1 https://github.com/eser/rulesWhat 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 | $0.00028 | $0.00231 |
| Opus 5 | $0.00014 | $0.00115 |
| Sonnet 5 | $0.00006 | $0.00046 |
| Haiku 4.5 | $0.00003 | $0.00023 |
Grade A, and why
design-principles 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.
What it actually says
Code Design Principles
Patterns for writing clean, maintainable, and testable code.
Quick Start
// Pure function with immutability
function updateUser(user: User, age: number): User {
return { ...user, age }; // new object, no mutation
}
Key Principles
- Pure functions: no side effects, same input = same output
- Immutability: create new objects/arrays instead of mutating
- Single responsibility: one function = one task
- Early returns: reduce nesting, improve readability
- Composition over inheritance: inject dependencies
- Promises over callbacks for async code
- Template strings over concatenation
- Plain objects for data, classes only for stateful services
- Avoid global variables and getters/setters
- Lazy initialization: no module-level side effects, wrap in getter functions
References
See rules.md for complete guidelines with examples.
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.
- 2d ago First seen · 35 lines · 0 tokens per session scan A 61885e406b57
design-principles is a skill published in the GitHub repository eser/rules (53 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 28 tokens to every session and 231 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 2026-08-30.
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