Individual skill

assumption-mapper

Extract and risk-rate hidden assumptions in a product brief or PRD. Use when asked to review a product brief for assumptions, audit a PRD for risks, find hidden assumptions, validate product plans, or run an assumption analysis. Produces a prioritised assumption map with confidence and impact scores, recommended validation methods, and critical assumption flags.

skills/assumption-mapper/SKILL.md

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Last checked: Nov 9, 2026

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Repository stars (not skill ratings): 1,539
Repository last updated: Nov 9, 2026
License: MIT

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SKILL.mdcore · 8,309 bytes
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templates/assumption-board.mddoc · 927 bytes

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# Assumption Mapper Skill

Surface and prioritize the untested assumptions embedded in any product plan before development begins.

## Required Inputs

Work from what is given. If any of these is missing, still produce the complete output: fill each gap with a reasonable assumption marked *(assumed, confirm)* and list those assumptions at the end. Ask a question first only when the core subject itself is missing (there is nothing to write about).
- **Product brief, PRD, or concept description** (even rough notes work)
- **Stage** (concept / discovery / pre-build / post-launch — affects which assumptions matter most)

## Where this sits — the spine's entry point

This is the front of the product-decision spine: **`assumption-mapper` → `/prd-template`
→ `/rice-prioritisation` → `/roadmap-narrative`**. It takes a raw idea or brief and