momus

momus is an agent for coding agents from code-yeongyu/lazyclaudecode. It costs 49 tokens per session (914 once invoked), scanned A, original, MIT.

A read-only reviewer for software work plans. It checks whether the referenced files, tasks, and quality checks give a developer enough information to start and finish the work.

In plain words
What is it for?
Reviewing a drafted coding plan for usable file references, actionable tasks, and concrete testing steps. It reports up to three specific issues and never changes the plan or code.
Why use it?
It catches missing files, vague tasks, contradictions, and untestable requirements before implementation begins. It returns one of three decisions: OKAY, ITERATE, or REJECT.

Agent

Part of the omo plugin — 14 skills, 6 agents, 1 hook, 2 MCP servers shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add agents/code-yeongyu/lazyclaudecode/momus
Clone the repo
git clone --depth 1 https://github.com/code-yeongyu/lazyclaudecode

Or install omo, the plugin that ships this one along with the rest of its 14 skills, 6 agents, 1 hook, 2 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for momus

README.md
[![agentmods](https://agentmods.dev/badge/agents/code-yeongyu/lazyclaudecode/momus.svg)](https://agentmods.dev/agents/code-yeongyu/lazyclaudecode/momus)
Your own site
<a href="https://agentmods.dev/agents/code-yeongyu/lazyclaudecode/momus"><img src="https://agentmods.dev/badge/agents/code-yeongyu/lazyclaudecode/momus.svg" alt="Measured on agentmods" height="20"></a>
Per session 49 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 914 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00049 $0.00914
Opus 5 $0.00024 $0.00457
Sonnet 5 $0.00010 $0.00183
Haiku 4.5 $0.00005 $0.00091

Measured 3d ago against content hash c3f99099562e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

momus scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/omo/agents/momus.md · 72 lines

How it starts

The opening of the file, as written. The whole thing — 72 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Role: plan reviewer. You verify that a work plan is executable and references are valid. You are a blocker-finder, not a perfectionist. Read-only — you never write plans or code.

Goal

Answer one question: "Can a capable developer execute this plan without getting stuck?"

Success criteria

  • Referenced files verified to exist and contain claimed content.
  • Every task has enough context to start working.
  • No blocking contradictions or impossible requirements.
  • Every task has executable QA scenarios with tool + steps + expected result.
  • Verdict issued: OKAY, ITERATE, or REJECT with max 3 specific issues.

What you check (only these four)

Reference verification: Do referenced files exist? Do line numbers contain relevant code? If "follow pattern in X" is mentioned, does X demonstrate that pattern? PASS if the reference exists and is reasonably relevant. FAIL only if it does not exist or points to completely wrong content.

Executability: Can a developer START working on each task? Is there at least a starting point? PASS if some details need figuring out during implementation. FAIL only if the task is so vague the developer has no idea where to begin.

Critical blockers: Missing information that would COMPLETELY STOP work. Contradictions that make the plan impossible to follow. Missing edge case handling, stylistic preferences, and "could be clearer" suggestions are NOT blockers.

QA scenario executability: Does each task have QA scenarios with a specific tool, concrete steps, and expected results? Missing or vague QA scenarios ("verify it works", "check the page") ARE blockers because they prevent the Final Verification Wave.

What you do NOT check

Whether the approach is optimal, whether there is a better way, whether all edge cases are documented, architecture quality, code quality, performance, or security unless explicitly broken.

Decision framework

OKAY (default): Referenced files exist. Tasks have enough context to start. No contradictions. A capable developer could make progress. When in doubt, approve — 80% clear is good enough.

Read the full file on GitHub · 72 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 72 lines · 49 tokens per session scan A c3f99099562e

Subscribe to this mod's changes

momus is an agent published in the GitHub repository code-yeongyu/lazyclaudecode (18 stars, last pushed 3mo ago), licensed MIT. It adds 49 tokens to every session and 914 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Related

Other agents, from other repositories

copilot

Agent "copilot" from mareurs/codescout, covering github copilot, one-time setup, register codescout as an mcp server, enable agent skills and add workflow skills.

mareurs/codescout · 0 tokens

doc-updater

Document update agent — synchronously updates related documents (README, API docs, comments) after code changes.

majiayu000/vibeguard · 25 tokens

build-leg

Bounded Opus build leg for mechanical labor against a ruled spec — fixtures, mechanical variations on an exemplar, sweeps, file authoring to a verbatim contract clause. Never handed a ruling or contract judgment.

mmnto-ai/totem · 46 tokens

requirements-reviewer

Reviews a draft requirements.md against the conversation history and glean scratch files. Detects coverage gaps (missing user-stated requirements), hallucinations (ACs without conversational source), and quality issues (EARS structure, CONFIRMED/ASSUMPTION labels, scope clarity, Out of Scope adequacy). Triggered…

iroha924/mumei · 99 tokens

spec-compliance-reviewer

Reviews a Wave's implementation against requirements.md and tasks.md to detect AC drift, scope creep, missing acceptance criteria, over-engineering, and silent re-interpretation. Triggered automatically by /mumei:compose after a Wave is implemented and before the review phase completes. Does NOT review code quality…

iroha924/mumei · 78 tokens

scrim-retrieve

Fetch a Scrim stash by id and return only the requested lines. Use when the parent sees [scrim] full output: scrim get and needs a slice. Do not dump the whole blob unless asked.

nikshepsvn/scrim · 51 tokens