Acting On Hypotheses
Operational discipline for open-ended, uncertain, or ambitious work, distilled from 馬田隆明『仮説行動』 (マップ・ループ・リープ / Map-Loop-Leap). Forces an agent to neither freeze / over-ask / collect-more until "certain", nor big-bang on unvalidated assumptions: frame explicit hypotheses (Map), run the single cheapest test that could PROVE YOU WRONG (Loop), commit boldly only where the map shows asymmetric, ideally-reversible upside (Leap). Use whenever the answer cannot be fully known by understanding what already exists — you must ACT to learn or to create it: de-risking an approach, deciding what to build/try next under uncertainty, spiking/prototyping to decide, choosing whether to commit to X, sizing a bet, or setting a kill condition. Trigger on: 仮説検証 (of a FORWARD bet / an outcome you must ACT to learn — NOT verifying a present fact, which is raising-resolution), 仮説行動, マップ・ループ・リープ, 学びの最大化, 確信度 / 影響度, 不確実 / uncertainty, 実験 / experiment, 大胆 / 賭け / bet, ピボット / pivot, 撤退条件 / kill condition, de-risk / validate the approach, spike / prototype to decide, MVP, build-measure-learn, "will this scale", "should we commit to X", "approach に賭けるべきか". DOES NOT fire on understanding a present, knowable-but-blurry reality (unclear bug, vague spec, unfamiliar codebase, "what do users do today") → that is raising-resolution. This skill is English; respond to the user in their language (default Japanese).
Security AStatic scan found no risk patternsHow grading works ›
What this skill does
Acting On Hypotheses is a community-contributed Claude Code skill in the science-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/acting-on-hypotheses/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use whenever the answer cannot be fully known by understanding what already exists — you must ACT to learn or to create it: de-risking an approach, deciding what to build/try next under uncertainty, spiking/prototyping to decide, choosing whether to commit to X, sizing a bet, or setting a kill condition. Trigger on: 仮説検証 (of a FORWARD bet / an outcome you must ACT to learn — NOT verifying a present fact, which is raising-resolution), 仮説行動, マップ・ループ・リープ, 学びの最大化, 確信度 / 影響度, 不確実 / uncertainty, 実験 / experiment, 大胆 / 賭け / bet, ピボット / pivot, 撤退条件 / kill condition, de-risk / validate the approach, spike / prototype to decide, MVP, build-measure-learn, "will this scale", "should we commit to X", "approach に賭けるべきか".
Who uses this skill
The Acting On Hypotheses Claude Code skill is built for researchers, data scientists, academics, and analysts working with complex data and scientific literature. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/acting-on-hypotheses
curl -L https://claudskills.com/skills/acting-on-hypotheses/SKILL.md \
-o ~/.claude/skills/acting-on-hypotheses/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/acting-on-hypotheses/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/acting-on-hypotheses/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\acting-on-hypotheses\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
Pro
One-click install via the desktop app
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Acting On Hypotheses Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/acting-on-hypotheses/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Acting On Hypotheses skill do?
Operational discipline for open-ended, uncertain, or ambitious work, distilled from 馬田隆明『仮説行動』 (マップ・ループ・リープ / Map-Loop-Leap). Forces an agent to neither freeze / over-ask / collect-more until "certain", nor big-bang on unvalidated assumptions: frame explicit hypotheses (Map), run the single cheapest test that could PROVE YOU WRONG (Loop), commit boldly only where the map shows asymmetric, ideally-reversible upside (Leap). Use whenever the answer cannot be fully known by understanding what already exists — you must ACT to learn or to create it: de-risking an approach, deciding what to build/try next under uncertainty, spiking/prototyping to decide, choosing whether to commit to X, sizing a bet, or setting a kill condition. Trigger on: 仮説検証 (of a FORWARD bet / an outcome you must ACT to learn — NOT verifying a present fact, which is raising-resolution), 仮説行動, マップ・ループ・リープ, 学びの最大化, 確信度 / 影響度, 不確実 / uncertainty, 実験 / experiment, 大胆 / 賭け / bet, ピボット / pivot, 撤退条件 / kill condition, de-risk / validate the approach, spike / prototype to decide, MVP, build-measure-learn, "will this scale", "should we commit to X", "approach に賭けるべきか". DOES NOT fire on understanding a present, knowable-but-blurry reality (unclear bug, vague spec, unfamiliar codebase, "what do users do today") → that is raising-resolution. This skill is English; respond to the user in their language (default Japanese).
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Acting On Hypotheses skill?
Use Acting On Hypotheses when your Claude Code task falls under the Science & Research category — specifically in the science misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Acting On Hypotheses" or describe the task and let Claude pick). Browse related skills at
/category/science/.
What is a Claude Code skill and how does the Acting On Hypotheses skill fit in?
A Claude Code skill is a
SKILL.md file that lives under
~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Acting On Hypotheses is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
fuyutarow. (2026). Acting On Hypotheses [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/acting-on-hypotheses/
BibTeX
@misc{acting-on-hypotheses-2026,
author = {fuyutarow},
title = {Acting On Hypotheses [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/acting-on-hypotheses/}
}Embed this skill
Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →
Badge
[](https://claudskills.com/skills/acting-on-hypotheses/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
<script>
<script src="https://claudskills.com/embed/acting-on-hypotheses.js" async></script>
<iframe>
<iframe src="https://claudskills.com/embed/acting-on-hypotheses.html" width="100%" height="160" frameborder="0" loading="lazy" title="ClaudSkills: Acting On Hypotheses"></iframe>
Security scan
Grade A · scanned 2026-09-28 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
- ✓ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
[](https://claudskills.com/skills/acting-on-hypotheses/#security)
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