Individual skill

prototyping-when-and-what

Use this skill when deciding what to prototype, what fidelity to use, and when to stop prototyping and ship. Trigger when planning research, scoping a design phase, or facing pressure to "stop prototyping and just build it." Sub-aspect of `prototyping`; read that first.

plugins/HDeibler/universal-design-principles/plugins/process-and-robustness-principles/skills/prototyping-when-and-what/SKILL.md

Read pinned source

Source commit d780783eba4ecc7c8b9429f95c9362df95f07c61

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
No
Observed behavior
Network or broad shell
Last checked
Nov 4, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings)
1,537
Repository last updated
Nov 7, 2026
License
Apache-2.0

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files
Read excerpt

# Picking what and when to prototype

Prototyping has costs (time, opportunity, sometimes confusion). Picking the right thing to prototype, at the right fidelity, at the right moment, is how teams get the benefits without the costs.

## What to prototype

Three categories of question prototypes answer well:

### Risky assumptions

Things you're not sure will work. The riskier the assumption, the more valuable the prototype.

- "Users will understand this new flow" — prototype + user test.
- "This algorithm will be fast enough at production scale" — throwaway performance prototype.