What is hypothesis-library?

A structured library for recording experiment ideas, assumptions, evidence, results, and past learnings. It uses consistent records so teams can compare and reuse what they have learned.

Use it to capture experiment hypotheses, record supporting evidence, track their status, and preserve results and follow-up ideas.

It prevents useful research from being lost and makes it easier to judge which hypotheses are ready to prioritize or test.

hypothesis-library — Skill for Claude Code by The-Utopia-Studio/skills

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add The-Utopia-Studio/skills --skill hypothesis-library

Clone the repo

git clone --depth 1 https://github.com/The-Utopia-Studio/skills

Made for: Claude Code.

Or install utopia-investments, the plugin that ships this one along with the rest of its 66 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/the-utopia-studio/skills/hypothesis-library/github.svg)](https://agentmods.dev/skills/the-utopia-studio/skills/hypothesis-library)

Your own site

<a href="https://agentmods.dev/skills/the-utopia-studio/skills/hypothesis-library"><img src="https://agentmods.dev/badge/skills/the-utopia-studio/skills/hypothesis-library/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/the-utopia-studio/skills/hypothesis-library"><img src="https://agentmods.dev/badge/skills/the-utopia-studio/skills/hypothesis-library.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 18 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 237 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00018	$0.00237
Opus 5.5	$0.00007	$0.00095
Sonnet 5.5	$0.00004	$0.00047
Haiku 4.5	$0.00002	$0.00024

Measured 2mo ago against content hash 89e222dee10d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

hypothesis-library scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/utopia-investments/skills/hypothesis-library/SKILL.md · 32 lines

What it actually says