Map and test product assumptions with Claude Code

Use assumption-mapping to rank beliefs behind a product idea and design small tests for the riskiest ones.

Install in Claude Code

Claude Code with a product brief and existing evidence.

Open the pinned GitHub source below and retrieve the `product-manager/discovery/skills/assumption-mapping/` directory from that revision.
Copy it into `.claude/skills/assumption-mapping/` in your project, keeping `SKILL.md` and its companion files together.
Open Claude Code in the project root and enter `/assumption-mapping` followed by the example task.

Example task

Propose a neighborhood book exchange. Assume residents will list books weekly and that staff can maintain a pickup point. Request an assumption map and a five-person interview test for the first belief.

What to check

The map records evidence, impact, validation order, and a threshold based on behavior the interviews can uncover.

Original SKILL.md on GitHub · Updated 2026-11-11

Frequently asked question

Which product assumption should I validate first?

Start with a weakly supported belief whose failure would invalidate the plan or block other tests.