Skip to content
appsgit

Doubt Driven Development

Doubt Driven Development is an agent skill (a SKILL.md file) from addyosmani/agent-skills. Subjects every non-trivial decision to a fresh-context adversarial review before it stands. It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 102,166 GitHub stars across a repository of 13 listed skills.

github.com/addyosmani/agent-skills/skills/doubt-driven-development (opens in a new tab)

  • Multi-skill repo
  • Plugin marketplace
  • Security
  • Actively maintained
View on GitHub (opens in a new tab)View on skills.sh (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add addyosmani/agent-skills
/plugin install agent-skills@addy-agent-skills

In the Claude apps, zip the doubt-driven-development folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/addyosmani/agent-skills.git
cp -r agent-skills/skills/doubt-driven-development .agents/skills/doubt-driven-development   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/addyosmani/agent-skills.git
cp -r agent-skills/skills/doubt-driven-development .cursor/skills/doubt-driven-development   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Subjects every non-trivial decision to a fresh-context adversarial review before it stands. Use when you want every assumption cross-examined before proceeding, when stress-testing a plan for hidden failure modes, when correctness matters more than speed, when working in unfamiliar code, when stakes are high (production auth, security-sensitive logic, a high-stakes migration, irreversible operations), or any time a confident output would be cheaper to verify now than to debug later.

When it triggers

  • Use when you want every assumption cross-examined before proceeding, when stress-testing a plan for hidden failure modes, when correctness matters more than speed, when working in unfamiliar code, when stakes are high (production auth, secu

More skills in addyosmani/agent-skills

13 skills are listed from this repository.

Similar skills

More security skills

All Security

FAQ

Doubt Driven Development FAQ

Still curious? Email info@appsgit.com.

What is the Doubt Driven Development skill?

Doubt Driven Development is an agent skill (a SKILL.md file) from addyosmani/agent-skills. Subjects every non-trivial decision to a fresh-context adversarial review before it stands. It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 102,166 GitHub stars across a repository of 13 listed skills. Its SKILL.md lives at github.com/addyosmani/agent-skills/skills/doubt-driven-development.

How do I install the Doubt Driven Development skill?

In Claude Code, run /plugin marketplace add addyosmani/agent-skills and then /plugin install agent-skills@addy-agent-skills. For Codex or Cursor, copy the doubt-driven-development folder into .agents/skills/ or .cursor/skills/.

Is the Doubt Driven Development skill free?

Yes. The repository is open source under the MIT license.

Is Doubt Driven Development maintained?

The repository's most recent commit was on Oct 3, 2026. Its latest release is 0.6.12. appsgit only lists skills from repositories with a commit in the last six months.