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/skills/critique-agent/SKILL.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/skills/ertra/pm-brain-for-cursor/critique-agent)<a href="https://agentmods.dev/skills/ertra/pm-brain-for-cursor/critique-agent"><img src="https://agentmods.dev/badge/skills/ertra/pm-brain-for-cursor/critique-agent/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/skills/ertra/pm-brain-for-cursor/critique-agent"><img src="https://agentmods.dev/badge/skills/ertra/pm-brain-for-cursor/critique-agent.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 | $0.00069 | $0.03064 |
| Opus 5 | $0.00034 | $0.01532 |
| Sonnet 5 | $0.00014 | $0.00613 |
| Haiku 4.5 | $0.00007 | $0.00306 |
Grade A, and why
critique-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 9d 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.
Critique Agent (pm-brain)
Challenge an existing product brief, PRD, or PRD + metrics pack by surfacing assumptions, gaps, inconsistencies, and likely failure scenarios. You are not killing the idea — you are making it survive the next stakeholder review.
Repo convention: Feature hub paths and stable basenames — see 02-templates/README.md (Feature hub convention). The braindump gate from PRODUCT-RULES.md does not apply here — the doc already exists.
When to Use This Skill
- Pressure-testing a brief or PRD before sharing with SLT / GM / eng leads
- A draft "feels too easy" and you want a reality check
- Preparing for tough questions from skeptical stakeholders (Eng, Finance, Sales, Legal, Design)
- Sanity-checking brief → PRD → metrics consistency before handoff
- Pre-mortem: imagine this shipped and failed — why?
What You'll Need
Critical inputs (collect in Step 0 if missing):
- The doc(s) to critique — PROJECT key + which file(s), or an explicit path
- Critique mode —
brief/prd/pack(PRD + metrics together) /cross-doc(brief vs. PRD vs. metrics consistency)
Nice-to-have inputs:
- Specific concerns the PM already has ("I'm worried about engineering feasibility on use case 3")
- Target audience for the upcoming review (SLT vs. eng vs. cross-functional)
- Calibration: light (top 3 risks) / standard / hard (maximally skeptical)
Step 0: Locate the target doc
- Ask for the PROJECT key (
PROJECT-abcde) or an explicit file path. - Resolve feature hub:
projects/{PROJECT-KEY}-{slug}/. List matching dirs if ambiguous. - Confirm which doc(s) exist and which to critique. Default targets in order of preference:
pack(both02-product-requirements.md+03-success-metrics.md) if both exist- Single doc otherwise
cross-docif01,02, and03all exist and the user wants consistency checking
- Ask the calibration: light / standard / hard. Default = standard.
- Ask for any specific concerns the PM already has — they get extra scrutiny.
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.
- 9d ago First seen · 275 lines · 69 tokens per session scan A 3281e67d8da9
critique-agent is a skill published in the GitHub repository ertra/pm-brain-for-cursor (22 stars, last pushed 3mo ago), licensed MIT. It adds 69 tokens to every session and 3,064 once invoked, about $0.0003 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.
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