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/wallkop/opc-develop/demonpx skills add wallkop/opc-develop --skill demogit clone --depth 1 https://github.com/wallkop/opc-developWhat 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 | $0.00086 | $0.00654 |
| Opus 5 | $0.00043 | $0.00327 |
| Sonnet 5 | $0.00017 | $0.00131 |
| Haiku 4.5 | $0.00009 | $0.00065 |
Grade A, and why
demo 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
demo
捏泥人：数据是假的，手感是真的。Demo 的价值 ∝ 未定产品决策的数量—— 产品行为能用文字无歧义写清就跳过本环节；不要把发现机制变成仪式。
前置
- 加载
${CLAUDE_PLUGIN_ROOT}/shared/core-contract.md；必须已有brief.md。 - Mock 走 Harness 探索面：Port 上的 Fake Adapter、
run --mock一键纯前端闭环 （见docs/harness.zh-CN.md第 5 章）。项目还没有该能力时就地搭最薄的假后端， 缺口留给harness-retrofit，不在本环节建框架。
做法
- 纯 vibe-coding：不写测试、不设门禁、不跑验证，速度优先。Demo 落在真实项目前端里 （真组件、真路由、真请求层，只有数据是假的），通过真实应用壳可达——不做孤立 HTML。
- 必须支持独立部署/预览：给人一个能打开的 URL 或一条能跑的命令。
- Mock 至少可注入延迟、错误、空态、极端数据四类条件——不注入延迟的 Demo， 等于替用户决定了"这个产品没有加载态设计"。体感验收至少过一遍非正常路径。
- 体感循环是主体：人随口反馈、随手改，不留记录。只警惕一条边界—— 改变"什么是真的"（人群错了、主流程错了）属于 revise，回 brief.md。
收口（唯一的硬要求）
- 待确认决策清单在看 Demo 之前列出（人裁判同样先锁 Oracle）； 人逐条给出 确认 / 修改 / 否决——不许一句"感觉不错"。 留痕带上 Mock 配置摘要：0ms 延迟下确认的决策和 300ms 注入下确认的，是两个事实。
- 显式决定 Demo 代码哪些保留、哪些重写——不允许默认全部转正。
- 确认的产品决策带进 design，成为 PD 的直接来源。
产出
可体验、可独立部署的 Demo + 确认的产品决策清单。下一步：design。
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 · 40 lines · 86 tokens per session scan A 2c926873bf96
demo is a skill published in the GitHub repository wallkop/opc-develop (11 stars, last pushed 1mo ago), licensed MIT. It adds 86 tokens to every session and 654 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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