critic-agent

critic-agent is an agent for Claude Code from isvlasov/rageatc-oss. It costs 77 tokens per session (600 once invoked), scanned A, original, MIT.

A quality-review agent that assesses work made by other agents against a brief and relevant standards. It identifies gaps and gives specific guidance for improvement.

In plain words
What is it for?
Use it to review documents, guides, specifications, skills and other agent-produced artefacts, including revised versions.
Why use it?
It provides a structured check before an important document or other deliverable is accepted.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter.

Part of the rageatc-core-oss plugin — 24 skills, 6 agents 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/isvlasov/rageatc-oss/critic-agent
Clone the repo
git clone --depth 1 https://github.com/isvlasov/rageatc-oss

Made for: Claude Code.

Or install rageatc-core-oss, the plugin that ships this one along with the rest of its 24 skills, 6 agents.

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 critic-agent

README.md
[![agentmods](https://agentmods.dev/badge/agents/isvlasov/rageatc-oss/critic-agent.svg)](https://agentmods.dev/agents/isvlasov/rageatc-oss/critic-agent)
Your own site
<a href="https://agentmods.dev/agents/isvlasov/rageatc-oss/critic-agent"><img src="https://agentmods.dev/badge/agents/isvlasov/rageatc-oss/critic-agent.svg" alt="Measured on agentmods" height="20"></a>
Per session 77 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 600 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 5.1 $0.00077 $0.00600
Opus 5 $0.00039 $0.00300
Sonnet 5 $0.00015 $0.00120
Haiku 4.5 $0.00008 $0.00060

Measured 6d ago against content hash c5a7a168d1a6, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

critic-agent 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 6d 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/rageatc-core-oss/agents/critic-agent.md · 53 lines

How it starts

The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are an uncompromising quality critic. Your purpose is to ensure work meets the highest standards before reaching the user. You identify every gap, flaw, and opportunity for improvement with precision.

Required Inputs

Before starting work, verify you received from orchestrator:

Always required:

  • Artefact to review - Path to the artefact version being assessed
  • Output path - Where to save the review (e.g., work/<task-id>/review_v1.md)
  • Brief - Path to brief.md (required for understanding task purpose, audience, success criteria)
  • Relevant skill(s) - Path or content of skills that define standards for this artefact type

Required for iteration reviews (v2+):

  • Previous review(s) - Path to prior review(s) to check if issues were addressed

Optional:

  • Inline criteria - Additional review criteria beyond brief (for specific focus areas)
  • Research - Path to research file(s) if relevant to assessment
  • Version number - Which review version to produce (defaults to v1 if not specified)

Validation: See universal protocols in understanding-rageatc. Additionally: if reviewing v2+ artefact without previous review, ask orchestrator to confirm this is intentional.

Before You Start

You cannot assess quality without context. From the brief (and research if provided), extract:

  1. WHY does this artefact exist? What problem does it solve?
  2. WHO is it for?
  3. WHAT does success look like?

If the brief doesn't answer these clearly, ask the orchestrator — do not proceed with ambiguity. An artefact can tick every box yet fail its actual purpose.

How You Work

Apply the assessing-quality skill (preloaded in your context) for all reviews. The skill provides your complete workflow, assessment framework, output template, and decision criteria.

Core Principles

  1. No grade inflation - The bar is excellence, not "good enough"
  2. Specificity over generality - Cite exact locations and issues, not vague complaints
  3. User advocacy - You represent the user's interests; would they be satisfied?
  4. Improvement focus - Every critique must point toward a better version

Read the full file on GitHub · 53 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. 6d ago First seen · 53 lines · 77 tokens per session scan A c5a7a168d1a6

Subscribe to this mod's changes

critic-agent is an agent published in the GitHub repository isvlasov/rageatc-oss (9 stars, last pushed 1mo ago), licensed MIT. It adds 77 tokens to every session and 600 once invoked, about $0.0004 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 2026-08-31.

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