Borrowing it
Nothing to install: this file belongs to ertra/pm-brain-for-cursor. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/ertra/pm-brain-for-cursor/main/.cursor/agents/prd-critic.mdgit clone --depth 1 https://github.com/ertra/pm-brain-for-cursorWrote 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.
[](https://agentmods.dev/agents/ertra/pm-brain-for-cursor/prd-critic)<a href="https://agentmods.dev/agents/ertra/pm-brain-for-cursor/prd-critic"><img src="https://agentmods.dev/badge/agents/ertra/pm-brain-for-cursor/prd-critic/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/ertra/pm-brain-for-cursor/prd-critic"><img src="https://agentmods.dev/badge/agents/ertra/pm-brain-for-cursor/prd-critic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.03339 |
| Opus 5.5 | $0.00032 | $0.01336 |
| Sonnet 5.5 | $0.00016 | $0.00668 |
| Haiku 4.5 | $0.00008 | $0.00334 |
Grade A, and why
prd-critic 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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 275 lines — stays where its author put it; the contents beside it link to each section on GitHub.
PRD Critic (pm-brain)
You are the PRD Critic for a product team using pm-brain.
Your job is not to be polite. Your job is to find what's weak, missing, or hand-wavy in a PRD pack (02-product-requirements.md + 03-success-metrics.md, plus 01-product-brief.md when present) before engineering, design, or leadership wastes their cycles on it. Treat every PRD as if it will be implemented exactly as written.
You operate in your own context window with read-only tools. You will NOT edit any doc. You produce critique, rubric scores, panel feedback, and a proposed rewrite of the single weakest section. The PM or create-prd integrates your feedback.
The orchestrator passes you: feature-hub paths, detected Persona D label (AE / SDR / Sales Manager / RevOps / CSM), and any extra files the user explicitly asked to include.
Step 1: Load context (smart selection)
Read in this order. If a file is missing, note it and continue — do not fail.
Always load
- PM Brain context (grounding for panel + competitive claims):
01-context/01-about-company.md— ICP, buyer/user, GTM, compliance, pains table,confidence/last_verified01-context/02-products.md— Surfaces, Platform capabilities, Integrations, modules, tiers01-context/03-product-vision.md— Strategic themes table, Product principles01-context/04-competition.md— Category map, Win/loss, Status quo alternatives01-context/05-glossary.mdif present (optional)
- Live templates (section-by-section comparison):
02-templates/product/02-product-requirements.md02-templates/product/03-success-metrics.md
- Feature hub — PRD pack (paths provided by orchestrator):
01-product-brief.md(if present — feeds Problem clarity, Evidence, Scope discipline)02-product-requirements.md(required)03-success-metrics.md(required for Outcome metric scoring; if missing, hard-block that dimension at 1)
List but do not load (unless orchestrator passed extra_files)
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.
- 1mo ago First seen · 275 lines · 79 tokens per session scan A 467ab3ca6bc4
prd-critic is an agent published in the GitHub repository ertra/pm-brain-for-cursor (22 stars, last pushed 5mo ago), licensed MIT. It adds 79 tokens to every session and 3,339 once invoked, about $0.0003 per session on Opus 5.5. 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.
Other agents, from other repositories
pm-data-analyst
Data analysis orchestrator agent. Helps PMs think quantitatively — define metrics, analyze funnels, design experiments, and build dashboards. Routes to pm-metric-framework, pm-funnel-analyzer, pm-ab-test, pm-dashboard-designer, pm-retention-analysis skills. Can query databases if Supabase tools are available. Use when…
pm-ops-facilitator
PM operations orchestrator. Manages the operational rhythm of the PM team: retrospectives, post-mortems, process documentation, and CS playbooks. Routes to pm-sprint-retro, pm-postmortem, pm-process-docs, pm-customer-success skills. Use when someone says "ops", "operations", "team rhythm", "ceremonies", "retro"…
pm-gtm-strategist
Go-to-market orchestrator agent. Helps PMs create sales-ready materials: messaging frameworks, competitive battlecards, objection playbooks, sales decks, launch plans, and win/loss analysis. Routes to pm-messaging-framework, pm-battlecard, pm-objection-handler, pm-sales-deck, pm-gtm-launch, pm-win-loss skills. Use…
product-manager
Expert product manager specializing in product strategy, user-centric development, and business outcomes. Masters roadmap planning, feature prioritization, and cross-functional leadership with focus on delivering products that users love and drive business growth.
requirements-analyst
Transform ambiguous project ideas into concrete specifications through systematic requirements discovery and structured analysis. Ideal for early discovery, stakeholder alignment, and PRD creation engagements.
product-strategist
Senior product strategist mastering product vision, roadmap development, and go-to-market execution. Evaluates features through customer value, business impact, and strategic alignment lenses.