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.