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-briefgit 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-brief)<a href="https://agentmods.dev/skills/product-on-purpose/pm-skills/tool-design-sprint-brief"><img src="https://agentmods.dev/badge/skills/product-on-purpose/pm-skills/tool-design-sprint-brief/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-brief"><img src="https://agentmods.dev/badge/skills/product-on-purpose/pm-skills/tool-design-sprint-brief.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 | $0.00080 | $0.02214 |
| Opus 5 | $0.00040 | $0.01107 |
| Sonnet 5 | $0.00016 | $0.00443 |
| Haiku 4.5 | $0.00008 | $0.00221 |
Grade A, and why
tool-design-sprint-brief 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 9d 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 — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Sprint Brief
Produce the brief that aligns the team on challenge, sprint questions, participants, customer recruiting, prototype medium, interview format, logistics, and success criteria before Monday begins. A well-built brief prevents Monday morning from opening with re-litigation of "what are we testing this week?"; a missing or vague brief almost guarantees it.
Family contract: docs/reference/skill-families/design-sprint-skills-contract.md. This skill is a member of design-sprint-skills.
When to Use
- The readiness verdict from
tool-design-sprint-readinessis Go (or Conditional Go with preconditions cleared). - The sprint has dates blocked on calendars and you need the artifact that names what the sprint is for.
- The team has customer recruiting active and you need to commit a recruiting plan, honorarium budget, and Friday schedule before recruiting closes.
- A skeptical exec wants to know "what is the team doing for five days plus customer cost?" and you need an answer that fits on two pages.
When NOT to Use
- The sprint has already started. The brief is a prep artifact, not an in-sprint deliverable. If Monday is happening, run
tool-design-sprint-map-and-targetinstead. - The readiness verdict is Wait. The brief cannot fix an unready team; close the preconditions first, then re-run readiness, then invoke this skill.
- The team wants a stakeholder strategy document. The brief is internal prep, not an external deliverable. If a stakeholder document is needed, that is a downstream artifact (the Friday scorecard or the next-step memo).
- Customer recruiting has not started. The brief locks the recruiting plan but cannot replace the recruiter. If no recruiter is named, go back to readiness Wait verdict.
What This Skill Produces
A single bundled artifact with nine sections:
- Challenge statement and why-now: one paragraph naming the testable challenge and the urgency that justifies a sprint this week vs. later.
- Sprint questions: 2-4 specific questions the Friday testing answers. The highest-risk assumption from any prior Foundation Sprint becomes the lead question.
- Decider attendance windows: the load-bearing moments (Mon AM, Wed AM, Fri PM at minimum); fully blocked if available.
- Team roster with role assignments: who is in the room each day and what role each person plays through the week.
- Customer recruiting plan: target profile, source, count, incentive, recruiter owner, recruiting deadline, Friday schedule.
- Prototype medium decision: clickable, slideware, service role-play, paper, physical mock, or other; with rationale.
- Interview format: live or remote; moderated or unmoderated; recording and consent posture; observer-room setup.
- Logistics plan: dates, hours, location, format (in-person, remote, hybrid), tools, daily rhythm.
- Success criteria: observable outcomes that mark the sprint successful or not.
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.
- 9d ago First seen · 138 lines · 80 tokens per session scan A 34dfa2faefe6
tool-design-sprint-brief is a skill published in the GitHub repository product-on-purpose/pm-skills (663 stars, last pushed yesterday), licensed Apache-2.0. It adds 80 tokens to every session and 2,214 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 2026-09-03.
Other skills, from other repositories
product-designer
Use when the user asks to review a design, critique a UI or mockup, give design feedback, or check a screen for usability and accessibility issues. Do NOT use for visual brand or aesthetic preference debates, or for reviewing copy before layout is settled.
design-sprint
Use when asked to "run a design sprint", "5-day sprint", "prototype in a week", "test ideas before building", or "Jake Knapp sprint". Helps teams go from problem to tested prototype in five days. The Design Sprint framework (created by Jake Knapp at Google Ventures) compresses months of work into one focused week.
hooked-model
Use when asked to "build habit-forming products", "Hooked model", "trigger action reward investment", "create sticky behavior loops", or "design habit loops". Helps design products that form unprompted user habits. The Hooked Model (created by Nir Eyal) explains how products create habits through Trigger, Action…
breadboarding
Turn a shaped solution into a breadboard: user actions, UI affordances, system responsibilities, and wiring so it can be sliced and implemented.
deck-open-slide-canvas
OpenDesign's architecture review: the local daemon + agent-runtime design, the tradeoffs, and the decision to lock. Built as a decision-grade product management deck for staff eng, tech leads, security.
design-everyday-things
Apply foundational design principles: affordances, signifiers, constraints, feedback, and conceptual models. Use when the user mentions "why is this confusing", "affordance", "error prevention", "discoverability", "human-centered design", "mental model", "mapping", "seven stages of action", "users keep making…