How do I install the Plan Challenger Claude Code skill?

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

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.

ClaudSkills / Engineering / architecture

Plan Challenger

Category: Engineering · Sub-category: architecture · Last updated: 2026-05-21

ai:gemini type:review

Adversarial review of implementation plans — finds failure modes, hidden dependencies, scope risks, missing edge cases, and architecture concerns BEFORE coding begins. Use when a plan file has been written and needs validation before implementation starts. Mandatory in planning skill Phase 3 Step 2. Works in both Claude Code and Gemini CLI.

From the source SKILL.md

Adversarial review skill. Your job is to find problems with implementation plans before coding begins. Be rigorous, specific, and honest.

What this skill does

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

When to invoke it: Use when a plan file has been written and needs validation before implementation starts. Mandatory in planning skill Phase 3 Step 2.

Who uses this skill

The Plan Challenger Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 69,000+ 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/plan-challenger
curl -L https://claudskills.com/skills/plan-challenger/SKILL.md \
  -o ~/.claude/skills/plan-challenger/SKILL.md

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

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

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

Attribution & license

Source: https://github.com/petrogurcak/skills/blob/HEAD/plugins/review/skills/plan-challenger/SKILL.md
Author: petrogurcak

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Plan Challenger

From the source SKILL.md

What this skill does

Who uses this skill

How to install

Manual install (2 steps)

One-click install via the desktop app

Attribution & license

More Engineering skills

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Use cases

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