Is the Doubt-Driven Review skill free?

Yes. The skill itself is free from pimenov/codex-first-skills-pack. SkillProof publishes the install command and an independent test verdict at no cost.

What is the Doubt-Driven Review SkillProof Score?

9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.

How do I install Doubt-Driven Review?

Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.

Can I use Doubt-Driven Review with Cursor, Copilot, Gemini CLI, Codex or other AI tools?

The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.

Doubt-Driven Review

Adversarial pre-mortem gate for risky diffs, migrations, and 'this is safe' claims

by pimenov · pimenov/codex-first-skills-pack

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 9.2/10
Tested: Jul 14, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 42eecef

Ran a real prod-column-drop scenario baseline-vs-skill: baseline gave a decent ad-hoc safety checklist, the skill forced an explicit CLAIM/CONTRACT/adversarial-findings structure that surfaced a missing-backup gap and a lock-contention-under-load edge case the baseline only hinted at, and ended in an auditable 'revise, don't approve yet' decision instead of a soft 'looks fine if...'.

Scored on four weighted criteria — install, triggering, output vs. baseline, docs. How scoring works

Installs cleanly 5/5
Triggers reliably 5/5
Output vs. baseline 8/10
Docs & honesty 5/5

What Doubt-Driven Review does

A single self-contained methodology skill: state the claim, extract artifact+contract, run an adversarial 'find what's wrong' review (fresh subagent, external CLI with approval, or labeled degraded self-review), classify every finding, and stop only on a defined exit condition. Triggers before production, auth, data, billing, or irreversible changes are allowed to stand as 'safe' or 'done'.

How to install Doubt-Driven Review

git clone https://github.com/pimenov/codex-first-skills-pack
cd codex-first-skills-pack
mkdir -p ~/.claude/skills
cp -r skills/doubt-driven-review ~/.claude/skills/doubt-driven-review

Skills live in ~/.claude/skills/ (global) or .claude/skills/ (per-project). Restart Claude Code after installing.

Commands — how to trigger Doubt-Driven Review

/doubt-driven-review Adversarial pre-mortem gate for risky diffs, migrations, and 'this is safe' claims

It also activates on plain-language prompts like these:

Is it actually safe to drop this column in production?
Pre-mortem this migration before I ship it tomorrow
Challenge my claim that this refactor is behaviour-preserving

Frequently asked questions

Is the Doubt-Driven Review skill free?: Yes. The skill itself is free from pimenov/codex-first-skills-pack. SkillProof publishes the install command and an independent test verdict at no cost.
Does Doubt-Driven Review work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 14, 2026. Verdict: Tested · Works. Ran a real prod-column-drop scenario baseline-vs-skill: baseline gave a decent ad-hoc safety checklist, the skill forced an explicit CLAIM/CONTRACT/adversarial-findings structure that surfaced a missing-backup gap and a lock-contention-under-load edge case the baseline only hinted at, and ended in an auditable 'revise, don't approve yet' decision instead of a soft 'looks fine if...'.
What is the Doubt-Driven Review SkillProof Score?: 9.2/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 5/5.
How do I install Doubt-Driven Review?: Copy the install command from this page, run it in your terminal, and restart Claude Code. Skills live in ~/.claude/skills/ (global) or .claude/skills/ inside a project.
Can I use Doubt-Driven Review with Cursor, Copilot, Gemini CLI, Codex or other AI tools?: The SKILL.md format is native to Claude (Claude Code, Desktop, claude.ai). The instructions inside adapt to other assistants: Cursor rules, GitHub Copilot instructions, Windsurf rules, Custom GPTs, AGENTS.md for OpenAI Codex, and GEMINI.md for Google Gemini CLI — our conversion guides cover each, and the free converter on the tools page does the wrapping for you.