# Assumptions and Experiments Phase

> Use when validating solution concepts with the riskiest assumptions first.

- Skill: `tools-only/assumptions-and-experiments-phase` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add tools-only/assumptions-and-experiments-phase`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tools-only/assumptions-and-experiments-phase/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: tools-only (https://skillmd.com/u/tools-only)
- Updated: 2026-09-29
- Page: https://skillmd.com/skills/tools-only/assumptions-and-experiments-phase

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# Assumptions and Experiments Phase

Use when validating solution concepts with the riskiest assumptions first.

## Inputs
- Selected solution
- Evidence so far
- Constraints (time, budget, ethics)

## Process
1) List assumptions (desirability, usability, feasibility, viability, risk).
2) Prioritize by impact x uncertainty.
3) Design smallest experiments with decision thresholds.
4) Save assumptions and experiment plans to the OST graph linked to the solution.

## CLI Actions
- Add assumption: `uv run python scripts/ost.py assumption add --solution <id> "<title>" --data <json>`
- List assumptions: `uv run python scripts/ost.py assumption list --solution <id>`

## Output
- Assumption nodes linked to the solution.
- Next step: decide whether to proceed, pivot, or stop.