momus

Verify work plan executability and output OKAY or REJECT with blocking issues.

10|Updated Mar 22, 2026
One-click install
npx skills add https://github.com/Lee-SiHyeon/oh-my-copilot --skill momus-lee-sihyeon
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: momus
Source: https://github.com/Lee-SiHyeon/oh-my-copilot/tree/main/.github/skills/momus
Command: npx skills add https://github.com/Lee-SiHyeon/oh-my-copilot --skill momus-lee-sihyeon

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill prevents teams from wasting time by catching true execution blockers in work plans before development starts.

Core Features & Use Cases

  • Reference verification: Confirms referenced files exist and that line references point to plausibly relevant content.
  • Executability checks: Ensures each task has enough context for a capable developer to start.
  • Critical-blocker filtering: Rejects only when there are genuine reasons work cannot proceed, otherwise returns OKAY.

Quick Start

Ask your AI to run Momus after a plan is generated by Prometheus and review the plan at .sisyphus/plans/my-plan.md.

Frequently Asked Questions about momus

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I validate a development plan for executability before starting work?▼

Plan review for task executability involves verifying that referenced files exist and checking if each task has enough context to start. It strictly outputs [OKAY] or [REJECT] with a maximum of 3 actionable blocking issues.

What is blocker detection in workflow validation?▼

Blocker detection in workflow validation identifies only critical internal contradictions and missing file references that halt task executability. It avoids flagging non-critical issues, ensuring development can proceed without unnecessary friction.

How do I check if file references in a markdown plan point to valid content?▼

Checking file references in a markdown plan requires confirming that referenced files exist and line references point to plausibly relevant content. This reference verification confirms the plan's context is accurate before execution begins.

Can I use Momus to review a plan generated by any tool?▼

Momus reviews plans for executability regardless of the generator, though it specifically applies after Prometheus generates a plan. It verifies task startability and identifies critical blockers for capable developers.

Why does my plan validation return a rejection with only three issues?▼

Plan validation returns a rejection with only three issues due to strict blocker-only decision rules that output a maximum of 3 actionable blocking issues. This prevents wasting time on non-critical flaws before development starts.

When do I need to run a plan review for task executability?▼

You need to run a plan review for task executability after a plan is generated and before development starts. This catches true execution blockers early, preventing teams from wasting time on unexecutable plans.