Is the MECE skill free?

Yes. The skill itself is free from uxderrick/mece-skill. SkillProof publishes the install command and an independent test verdict at no cost.

What is the MECE SkillProof Score?

8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.

How do I install MECE?

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 MECE 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.

MECE

Scores any spec/plan/PRD for overlaps and gaps (Mutually Exclusive, Collectively Exhaustive) and asks before fixing.

by uxderrick · uxderrick/mece-skill

Tested · Works

Install — copy the command Download source ↗

Test report

Verdict: Tested · Works
Score: 8.8/10
Tested: Jul 15, 2026
Environment: Claude Code 2.x (agent harness)
Upstream re-checked: Aug 10, 2026 · 700acd3

Ran a fresh 6-item notification-system spec (not one of the skill's own worked examples) through both a baseline and a skill-guided pass: the baseline gave a vague 'looks pretty solid, maybe add SMS' reaction and never caught that 'Notification preferences' and 'User notification settings' were the same concept under two names; the skill's Step 2 mutual-exclusivity test caught that overlap explicitly, scored the spec 50/100, tagged two critical gaps (no SMS/text channel, no unsubscribe/compliance layer) and two moderate gaps (batching/throttling, template management), then correctly stopped and asked before fixing per its own hard rule. Fully self-contained -- SKILL.md, framework.md, and examples.md all live inside skills/mece/ with zero external or plugin-host dependencies, so the plain git-clone-and-cp-r install actually works as documented.

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 4/5

What MECE does

Validates an existing spec, plan, PRD, API design, or category list against the MECE framework -- every item in exactly one bucket, no gaps -- producing a 0-100 score with severity-tagged overlap/gap findings, or decomposes a fresh topic into a MECE issue tree. Triggers on 'check this', 'anything missing?', 'is this complete?', or 'break this down'; always reports and asks before applying any fix.

How to install MECE

git clone https://github.com/uxderrick/mece-skill.git
mkdir -p ~/.claude/skills
cp -r mece-skill/skills/mece ~/.claude/skills/mece

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

Commands — how to trigger MECE

/mece Scores any spec/plan/PRD for overlaps and gaps (Mutually Exclusive, Collectively Exhaustive) and asks before fixing.

It also activates on plain-language prompts like these:

Can you check if this PRD has any gaps or overlapping requirements in it?
Is my API design missing anything important before I send it for review?
Break this messy feature list down into clean, non-overlapping categories

Frequently asked questions

Is the MECE skill free?: Yes. The skill itself is free from uxderrick/mece-skill. SkillProof publishes the install command and an independent test verdict at no cost.
Does MECE work with Claude Code?: We tested it with Claude Code 2.x (agent harness) on Jul 15, 2026. Verdict: Tested · Works. Ran a fresh 6-item notification-system spec (not one of the skill's own worked examples) through both a baseline and a skill-guided pass: the baseline gave a vague 'looks pretty solid, maybe add SMS' reaction and never caught that 'Notification preferences' and 'User notification settings' were the same concept under two names; the skill's Step 2 mutual-exclusivity test caught that overlap explicitly, scored the spec 50/100, tagged two critical gaps (no SMS/text channel, no unsubscribe/compliance layer) and two moderate gaps (batching/throttling, template management), then correctly stopped and asked before fixing per its own hard rule. Fully self-contained -- SKILL.md, framework.md, and examples.md all live inside skills/mece/ with zero external or plugin-host dependencies, so the plain git-clone-and-cp-r install actually works as documented.
What is the MECE SkillProof Score?: 8.8/10 — installs cleanly 5/5, triggers reliably 5/5, output vs. baseline 8/10, docs & honesty 4/5.
How do I install MECE?: 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 MECE 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.