ClaudSkills / Science & Research / research-methods

Hdd

Q: What is a Claude Code skill and how does the Hdd 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. Hdd is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Science & Research category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Science & Research · Sub-category: research-methods · Last updated: 2026-05-21

Hypothesis-Driven Development (HDD) — 假设驱动开发方法论。当任务涉及不确定性时激活：诊断问题根因、排查 bug、方案选型、架构变更、或任何"试了几次都不对"的场景。也适用于：用户不确定该怎么做、反复尝试没有进展、需要在多个方案之间做选择、怀疑某个假设但没有验证、或者问题的根因不明确时。当用户表达类似意图时触发——不限于特定措辞。常见表达举例："用 HDD"、"先验证一下"、"这个问题到底是怎么回事"、"为什么不 work"、"搞不定"、"试了好几次都不行"、"不确定该用哪个方案"、"帮我排查一下"、"按 TDD 方式"、"先别急着改，想想为什么"。不适用于：指令明确、结果确定的简单编辑（改文案、加 import）。

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

七步流程：Step 0 → HT → PT → AT Design → DEV → AT Run → E2E

What this skill does

Hdd is a community-contributed Claude Code skill in the research-methods sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/hdd/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Hdd 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 161,000+ 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/hdd
curl -L https://claudskills.com/skills/hdd/SKILL.md \
  -o ~/.claude/skills/hdd/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/hdd/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/hdd/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\hdd\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 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.

See pricing → Download desktop app

Frequently asked questions

How do I install the Hdd Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/hdd/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Hdd skill do?

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 Hdd skill?

Use Hdd when your Claude Code task falls under the Science & Research category — specifically in the research methods 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 Hdd" or describe the task and let Claude pick). Browse related skills at /category/science/.

What is a Claude Code skill and how does the Hdd 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. Hdd 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

Author: MindCode

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

MindCode. (2026). Hdd [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/hdd/

BibTeX

@misc{hdd-2026,
  author    = {MindCode},
  title     = {Hdd [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/hdd/}
}

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

[![ClaudSkills](https://claudskills.com/badge/hdd.svg)](https://claudskills.com/skills/hdd/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-07-26 — 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):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/hdd/#security)

More Science & Research skills

Browse all Science & Research skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Science & Research skills → Top 100 skills

Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

Part of Acreator Store — Adam Lankamer's AI tools: PerfectStudio · Ucaption · UTagger · AutoXPoster · TestYourSkills · AutomationFlows · Au Naturel · Telegram @acreatorstore

Hdd