Day 2 (Tuesday) move of a Design Sprint that structures lightning demos and the four-step independent solution sketch protocol (Notes, Ideas, Crazy 8s, Solution Sketch). Each team member produces one solution sketch individually; the skill orchestrates the day but does not author the sketches themselves. Use Tuesday morning after Monday's target moment is locked. Output is the lightning demo board, sketch assignments, and the cohort of independent sketches that become Wednesday's heat-map materi
SkillScore91Maintained
Automatic
◆Product Management pack
Last verified 8/18/2026
What it changes
Passed 21 of 23 test cases with the skill, and 11 of 23 without it.
Without skill48%
With skill91%
Checks it passed that the model alone missed
Set Notes step duration to 20 minutes in the morning.
Confirm participant attendance for Wednesday morning.
Require exactly 3 lightning demo sources per participant.
and 9 more in the full report
10 fixed11 passed either way2 still failing0 broke
Pass-rate lift
+43 pp
Tokens
+65%
Agent turns
0%
Response time
-17%
Model gemini-3.6-flashMeasured 8/18/2026v121 of 23 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 10
Prompt
During Tuesday's sketching session for our e-commerce checkout flow, the Decider asks if they should review and approve the rough doodles during lunch before people move to Crazy 8s. What role does the Decider play on Tuesday afternoon?
What was checked, without and with the skill
Checked
Without skill
With skill
Instruct that the Decider sketches independently without making approval decisions mid-day.
Passed
Passed
Limit Tuesday Decider checkpoint actions to logistical collection and attendance confirmation.
Missed
Passed
case-04 · gemini-3.6-flash · 8/18/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md78 lines3 files
Design Sprint Sketch (Tuesday)
Structure Tuesday's solo-but-together work. Each team member, working independently and silently, produces lightning demos in the morning and a four-step solution sketch in the afternoon. The skill structures the activity; the humans produce the sketches. Wednesday's heat-map orientation depends on having a cohort of independent sketches that did NOT contaminate each other through group brainstorming.
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 Day 2 of the Design Sprint and Monday's Map and Target artifact is signed off.
Each team member brings at least 3 lightning demo sources (existing products, references, analogies that bear on the challenge).
The team has accepted the silent-independent-sketching constraint and will NOT lapse into group brainstorming.
Sketches are due Tuesday end-of-day for Wednesday morning heat-map.
When NOT to Use
Monday is not closed. Return to tool-design-sprint-map-and-target.
The team's instinct is to brainstorm as a group. Sprint method explicitly avoids this; if the team will not commit to independent work, the sprint will not produce diverse sketches and the heat-map becomes a popularity contest.
The sketch step is being treated as the prototype. Sketches are concept exploration on paper or Figma frames, not Thursday's working prototype.
Sketches are due Tuesday morning. Tuesday is the full day; rushing to lunch produces sketches the team cannot read Wednesday.
What This Skill Produces
A single bundled artifact with four sections:
Lightning demo board: each team member presents 3 demos (3 minutes each); the Facilitator extracts the reusable pattern from each demo into a one-line note. Result is a board with 12-21 patterns (4-7 team members x 3 demos).
Sketch assignment plan: divide (each person sketches a different part of the target moment) or swarm (everyone sketches the same target). Default is swarm for v0.1 Design Sprints; divide is for teams running their second sprint with the same target who want to broaden coverage.
Four-step sketches from each team member: Notes (20 min reviewing Monday output + lightning demos), Ideas (20 min rough doodles), Crazy 8s (8 minutes, 8 variations of the strongest Idea), Solution Sketch (30-90 min final 3-panel storyboard-style sketch).
Recruiting tracker update: Riley (or the recruiter) confirms Friday slots; surfaces any cancellations and triggers buffer-slot activation if needed.
See references/TEMPLATE.md for the canonical structure and references/EXAMPLE.md for the Brainshelf book-catalog Tuesday artifact.
Tuesday Time Structure
The full Tuesday workshop is approximately 7 hours (09:00-12:30 + 13:30-17:00). The skill's bundled artifact emerges across the day:
09:15-10:45: Lightning demos (each person 3 demos x 3 min + 1 min Facilitator extraction = ~12 min per person; 4-person team = ~50 min; 7-person team = ~85 min)
Day 1 morning move of a Foundation Sprint. Forces explicit team choices on target customer, important problem, team advantage, and competitors and alternatives. Produces a single coherent strategic frame that becomes the input to Day 1 afternoon Differentiation. Use after the sprint brief is signed and Day 1 morning is scheduled. Bundled artifact, not four separate decisions.