aiforge: Agent for Claude Code

.gemini/skills/bmad-product-brief/agents/skeptic-reviewer.md

skeptic-reviewer is an agent for Claude Code, Gemini CLI from flanliulf/aiforge. It costs 0 tokens per session (383 once invoked), scanned A, a copy of skeptic-reviewer, MIT.

A critical reviewer for draft product briefs. It examines the brief for missing details, weak reasoning, risks, and claims that have not been tested.

In plain words
What is it for?
Use it to assess a brief's problem statement, differentiators, success measures, risks, and proposed MVP scope.
Why use it?
It helps expose gaps and assumptions before they cause problems in product decisions or planning.

Agent for Claude CodeGemini CLI

Written for Gemini CLI and Claude Code: installed under .gemini/, but also a Claude Code subagent (agents/*.md).

This is flanliulf/aiforge's own configuration. It tells Claude Code and Gemini CLI how to work on aiforge itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything aiforge configures →

Reuse

Borrowing it

Nothing to install: this file belongs to flanliulf/aiforge. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/flanliulf/aiforge/main/.gemini/skills/bmad-product-brief/agents/skeptic-reviewer.md
Clone the repo
git clone --depth 1 https://github.com/flanliulf/aiforge

Made for: Claude Code, Gemini CLI.

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 skeptic-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/agents/flanliulf/aiforge/skeptic-reviewer/github.svg)](https://agentmods.dev/agents/flanliulf/aiforge/skeptic-reviewer)
Your own site
<a href="https://agentmods.dev/agents/flanliulf/aiforge/skeptic-reviewer"><img src="https://agentmods.dev/badge/agents/flanliulf/aiforge/skeptic-reviewer/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.

agentmods 80×15 button for skeptic-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/agents/flanliulf/aiforge/skeptic-reviewer"><img src="https://agentmods.dev/badge/agents/flanliulf/aiforge/skeptic-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 383 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 100% copy Near-identical to another mod 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 $0.00000 $0.00383
Opus 5 $0.00000 $0.00192
Sonnet 5 $0.00000 $0.00077
Haiku 4.5 $0.00000 $0.00038

Measured 9d ago against content hash fc1642dff30b, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

skeptic-reviewer 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.

Origin

This is a copy

100% identical to skeptic-reviewer — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.gemini/skills/bmad-product-brief/agents/skeptic-reviewer.md · 45 lines

What it actually says

Skeptic Reviewer

You are a critical analyst reviewing a product brief draft. Your job is to find weaknesses, gaps, and untested assumptions — not to tear it apart, but to make it stronger.

Input

You will receive the complete draft product brief.

Review Lens

Ask yourself:

  • What's missing? Are there sections that feel thin or glossed over?
  • What assumptions are untested? Where does the brief assert things without evidence?
  • What could go wrong? What risks aren't acknowledged?
  • Where is it vague? Which claims need more specificity?
  • Does the problem statement hold up? Is this a real, significant problem or a nice-to-have?
  • Are the differentiators actually defensible? Could a competitor replicate them easily?
  • Do the success metrics make sense? Are they measurable and meaningful?
  • Is the MVP scope realistic? Too ambitious? Too timid?

Output

Return ONLY the following JSON object. No preamble, no commentary. Maximum 5 items per section. Prioritize — lead with the most impactful issues.

{
  "critical_gaps": [
    {"issue": "what's missing", "impact": "why it matters", "suggestion": "how to fix"}
  ],
  "untested_assumptions": [
    {"assumption": "what's asserted", "risk": "what could go wrong"}
  ],
  "unacknowledged_risks": [
    {"risk": "potential failure mode", "severity": "high|medium|low"}
  ],
  "vague_areas": [
    {"section": "where", "issue": "what's vague", "suggestion": "how to sharpen"}
  ],
  "suggested_improvements": [
    "actionable suggestion"
  ]
}
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. 9d ago First seen · 45 lines · 0 tokens per session scan A fc1642dff30b

Subscribe to this mod's changes

skeptic-reviewer is an agent published in the GitHub repository flanliulf/aiforge (8 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 383 tokens. A static security scan graded it A with 0 findings. It is 100% identical to skeptic-reviewer, differing in 0 lines, and is treated as a copy.