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/smallnest/pigo/to-designnpx skills add smallnest/pigo --skill to-designgit clone --depth 1 https://github.com/smallnest/pigoWrote 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/smallnest/pigo/to-design)<a href="https://agentmods.dev/skills/smallnest/pigo/to-design"><img src="https://agentmods.dev/badge/skills/smallnest/pigo/to-design.svg" alt="Measured on agentmods" 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 | $0.00096 | $0.03535 |
| Opus 5 | $0.00048 | $0.01767 |
| Sonnet 5 | $0.00019 | $0.00707 |
| Haiku 4.5 | $0.00010 | $0.00353 |
Grade A, and why
to-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 6d 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
1 near-identical copy found in the catalogue:
- to-design — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 282 lines — stays where its author put it; the contents beside it link to each section on GitHub.
to-design — PRD to Design Document
Turn a PRD (or a rough idea) into a design document written in the style of Go's official design proposals: plain language, concrete examples, and—above all—an honest account of why this approach and not the alternatives.
This is not the same as prd-to-spec. A SPEC is an implementation contract (tables, endpoints, schemas) for an engineer to build against. A design document is a decision artifact: it argues for an approach, surfaces the tradeoffs, and lets a team agree on the same facts before anyone writes code. When the question is "how should we build this and why", produce a design doc; when the question is "give me the exact contract to implement", produce a SPEC.
设计哲学源自对 5 篇 Go 官方 proposal（泛型 / 错误包装 / loopvar / slog / try）的分析。核心信念：文档的价值不取决于方案是否通过，而取决于它是否让讨论建立在同一套事实和取舍之上。
When to Use
- A PRD exists and you need to decide how to build it before committing to implementation
- The approach has real tradeoffs and you want them documented and debated
- The change is risky, breaking, or hard to reverse (a design doc forces the compatibility conversation early)
- Multiple people need to agree on a direction before work fans out
- You want a durable record of "why we chose X and rejected Y" — even if the proposal is later rejected
If the team just needs the concrete contract to code against, use /prd-to-spec instead (or run to-design first, then prd-to-spec).
The Job
- Locate input — find or receive the PRD (or idea)
- Analyze context (optional) — scan the codebase for existing patterns, constraints, and prior art
- Surface the decisions — identify the real design forks and ask clarifying questions (max 3-5)
- Generate the design doc — following the structure and writing style below
- Review — present for feedback, especially on the Rationale and Compatibility sections
- Save — write to the agreed location
Step 1: Locate Input
Provide the PRD (or idea) to design from:
A. File path (e.g., tasks/prd-priority-system.md)
B. GitHub Issue URL
C. Paste content directly
D. Just describe the idea — I'll design from the conversation
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.
- 6d ago First seen · 282 lines · 96 tokens per session scan A e6819c049a64
to-design is a skill published in the GitHub repository smallnest/pigo (424 stars, last pushed 6d ago), licensed MIT. It adds 96 tokens to every session and 3,535 once invoked, about $0.0005 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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