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 product-on-purpose/pm-skills --skill tool-design-sprint-prototype-plangit clone --depth 1 https://github.com/product-on-purpose/pm-skillsWrote 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/product-on-purpose/pm-skills/tool-design-sprint-prototype-plan)<a href="https://agentmods.dev/skills/product-on-purpose/pm-skills/tool-design-sprint-prototype-plan"><img src="https://agentmods.dev/badge/skills/product-on-purpose/pm-skills/tool-design-sprint-prototype-plan/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/product-on-purpose/pm-skills/tool-design-sprint-prototype-plan"><img src="https://agentmods.dev/badge/skills/product-on-purpose/pm-skills/tool-design-sprint-prototype-plan.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- 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 | $0.00118 | $0.02120 |
| Opus 5 | $0.00059 | $0.01060 |
| Sonnet 5 | $0.00024 | $0.00424 |
| Haiku 4.5 | $0.00012 | $0.00212 |
Grade A, and why
tool-design-sprint-prototype-plan 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 8d 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 — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Sprint Prototype Plan (Thursday morning)
Thursday is the prototype build day. This skill produces the morning planning artifact that makes the build run; it does NOT build the prototype itself. The skill assigns roles, locks the fidelity bar, drafts the Five-Act interview script, defines the trial-run gate, and confirms Friday participants. The actual building (Figma frames, slideware decks, role-play scripts, paper assemblies) is craft work the team owns through the rest of Thursday.
Family contract: docs/reference/skill-families/design-sprint-skills-contract.md. This skill is a member of design-sprint-skills.
When to Use
- It is Thursday morning of the Design Sprint and Wednesday's storyboard is signed off.
- The Friday participant tracker needs a Thursday-morning confirmation check; cancellations now trigger buffer activation.
- The interview script needs to be drafted (or refined from a prior sprint's template) before the interviewer can mock-run it Thursday afternoon.
- The team needs role assignments before parallel build work begins; ad-hoc assignment Thursday afternoon wastes 1-2 hours.
When NOT to Use
- Wednesday is not closed. Return to
tool-design-sprint-decide-and-storyboard; without a locked storyboard, the prototype has no spec. - The team is trying to use this skill to build the prototype. The prototype is craft work (per Ratified Decision 1 in the DS integration plan). This skill plans Thursday; the build happens in Figma, Keynote, paper, or whatever the medium is.
- The team has decided to skip Friday's trial run. Trial run is the gate that catches "prototype is unreachable" or "interview script confuses customer" before live interviews start. Skipping it converts Friday into a debugging session.
- Friday participant cancellations have triggered cohort-shrinks-to-fewer-than-4. Pause the sprint and decide whether to postpone Friday or accept a reduced-evidence test.
What ships with it
3 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.
- 8d ago First seen · 126 lines · 118 tokens per session scan A 4d387d796ccd
tool-design-sprint-prototype-plan is a skill published in the GitHub repository product-on-purpose/pm-skills (663 stars, last pushed today), licensed Apache-2.0. It adds 118 tokens to every session and 2,120 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 2026-09-03.
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