critical-analysis

critical-analysis is a skill for Claude Code from poemswe/co-researcher. It costs 23 tokens per session (699 once invoked), scanned A, original, MIT.

A guide for testing claims, weighing evidence, and finding errors in reasoning. It covers logical fallacies, bias, causation versus correlation, study methods, and the strength of evidence.

In plain words
What is it for?
Use it to examine research claims, audit evidence, identify fallacies and bias, and assess sample sizes, controls, validity, and causal conclusions.
Why use it?
It helps separate what evidence actually shows from conclusions that are overstated or poorly supported. It also highlights ways that study design or funding can distort results.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the co-researcher plugin — 15 skills, 3 commands, 1 hook shipped together

Good fit Use it to examine research claims, audit evidence, identify fallacies and bias, and assess sample sizes, controls, validity, and causal conclusions.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/poemswe/co-researcher/critical-analysis
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.

Any agent
npx skills add poemswe/co-researcher --skill critical-analysis
Clone the repo
git clone --depth 1 https://github.com/poemswe/co-researcher

Made for: Claude Code.

Or install co-researcher, the plugin that ships this one along with the rest of its 15 skills, 3 commands, 1 hook.

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 critical-analysis

README.md
[![agentmods](https://agentmods.dev/badge/skills/poemswe/co-researcher/critical-analysis/github.svg)](https://agentmods.dev/skills/poemswe/co-researcher/critical-analysis)
Your own site
<a href="https://agentmods.dev/skills/poemswe/co-researcher/critical-analysis"><img src="https://agentmods.dev/badge/skills/poemswe/co-researcher/critical-analysis/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 critical-analysis

Your own site · 80×15
<a href="https://agentmods.dev/skills/poemswe/co-researcher/critical-analysis"><img src="https://agentmods.dev/badge/skills/poemswe/co-researcher/critical-analysis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 23 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 699 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00023 $0.00699
Opus 5 $0.00012 $0.00349
Sonnet 5 $0.00005 $0.00140
Haiku 4.5 $0.00002 $0.00070

Measured 13d ago against content hash 336bd9b5e403, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

critical-analysis 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 13d 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.

skills/critical-analysis/SKILL.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

1. Logical Fallacy Detection

  • Formal: Non-sequitur, affirming the consequent, etc.
  • Informal: Ad hominem, straw man, appeal to authority, false dichotomy, etc.
  • Causal: Post hoc ergo propter hoc, correlation vs. causation errors.

2. Bias Identification

  • Cognitive: Confirmation bias, anchoring, availability heuristic.
  • Research/Structural: Funding bias, publication bias, selection bias, spin.

3. Evidence Quality Auditing

  • Methodology Audit: Sample size adequacy, control quality, randomization rigor.
  • Validity Checks: Internal vs. External validity assessment.

Read the full file on GitHub · 73 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. 13d ago First seen · 73 lines · 23 tokens per session scan A 336bd9b5e403

Subscribe to this mod's changes

critical-analysis is a skill published in the GitHub repository poemswe/co-researcher (128 stars, last pushed 4d ago), licensed MIT. It adds 23 tokens to every session and 699 once invoked, about $0.0001 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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