Borrowing it
Nothing to install: this file belongs to arctan303/creator.skill. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/arctan303/creator.skill/main/.agents/skills/product-spec-builder/SKILL.mdgit clone --depth 1 https://github.com/arctan303/creator.skillWrote 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/arctan303/creator.skill/product-spec-builder)<a href="https://agentmods.dev/skills/arctan303/creator.skill/product-spec-builder"><img src="https://agentmods.dev/badge/skills/arctan303/creator.skill/product-spec-builder.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 | $0.00082 | $0.00693 |
| Opus 5 | $0.00041 | $0.00347 |
| Sonnet 5 | $0.00016 | $0.00139 |
| Haiku 4.5 | $0.00008 | $0.00069 |
Grade A, and why
product-spec-builder 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 today.
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
需求构建技能 (product-spec-builder)
Purpose
从用户文字中拆出真实目的、用户、场景、边界和成功条件，形成可验收的产品契约；不要把一句话包装成完整需求。
Trigger
- 0→1：产品目标、用户、核心场景或首版范围尚未形成。
- 产品变更：新增或改变外部行为，但变更目的、范围、兼容性或验收记录仍缺失/不充分。
- “Bug 修复”实际需要重新定义正确行为。
有效决定已确认目的、外部行为和验收标准时，单一小改直接进入 dev-builder，需要阶段计划才进入 dev-planner；仅恢复既定行为、内部重构、测试、CI 或文档时不触发。
Required context
- 用户原始想法、痛点或变更请求。
- 已有 Product Spec、仓库事实、接口和设计材料（如果存在）。
- 已确认约束、参考案例、截图、反例和不可接受结果。
- 当前已知事实、推断和未知项。
Workflow
- 先判断 0→1、产品变更或维护执行，不按用户使用的“优化/修复”字眼机械分类。
- 抽取已知目的、目标用户、核心场景、外部行为、范围和非目标。
- 只追问会改变路线、首版范围、公开行为或验收方式的高信息量问题；每轮通常 1 个，最多 2 个。
- 信息足够时停止追问，把未知项写成临时假设或明确阻塞。
- 0→1 生成 Product Spec；产品变更原位修订条款，标明待实现和旧决定替代关系。历史明细按需移出当前正文，不只追加相反声明。
Output
- 路线与依据。
- 已确认事实、临时假设和待确认问题。
- 编号需求
REQ-*与可观察验收标准AC-*。 docs/Product-Spec.md或项目约定文件；产品变更包含变更 ID、兼容性、迁移、回滚和非目标。
Stop or escalate
- 无法判断是恢复行为还是重新定义行为：最多追问 2 个关键问题。
- 目标用户、核心场景或成功条件缺失且会改变方案：停止等待确认。
- 依赖未确认的外部接口或业务规则：记录阻塞，不编造答案。
- 产品契约已充分且请求只是维护：转交
bug-fixer或dev-builder。
References
执行前读取 stage-contract.md。
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.
- today Changed 52ce6daefa7e
- 7d ago First seen · 52 lines · 82 tokens per session scan A 5cebc54e9231
product-spec-builder is a skill published in the GitHub repository arctan303/creator.skill (20 stars, last pushed yesterday), licensed MIT. It adds 82 tokens to every session and 693 once invoked, about $0.0004 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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