Agent skill

Logical Fallacy Detector

A specialized skill for identifying and correcting logical fallacies in debates.

Apache-2.0Auto-check passed

Install Logical Fallacy Detector

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .claude/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .claude/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .claude/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .agents/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .agents/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .agents/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .cursor/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .cursor/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/revfactory/harness-100.git --path en/60-debate-simulator/.claude/skills/logical-fallacy-detector

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .gemini/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .gemini/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .github/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .github/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .github/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install revfactory/harness-100 logical-fallacy-detector --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/revfactory/harness-100.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/en/60-debate-simulator/.claude/skills/logical-fallacy-detector .opencode/skills/logical-fallacy-detector && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "logical-fallacy-detector" agent skill from https://github.com/revfactory/harness-100/tree/main/en/60-debate-simulator/.claude/skills/logical-fallacy-detector into .opencode/skills/logical-fallacy-detector/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "logical-fallacy-detector", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: logical-fallacy-detector
GitHub stars: 1.3k
Token cost: ~1.2k tokens
SKILL.md length: 488 words
Files: 1
Skills in repo: 464
Repo updated: Mar 22, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

A specialized skill for identifying and correcting logical fallacies in debates.

SKILL.md covers Target Agents, Major Logical Fallacy…, Judge Evaluation Rubric (Logic… and Fallacy Identification…
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Logical Fallacy Detector is an agent skill from revfactory/harness-100. A specialized skill for identifying and correcting logical fallacies in debates. Used by judge and rapporteur agents to evaluate the logical soundness of both sides' arguments and point out errors. Automatically applied in contexts such as 'logical fallacy', 'fallacy detection', 'sophistry', 'argument evaluation', 'logic verification'. However, formal logic theorem proving and mathematical logic verification are outside the scope of this skill.

Its SKILL.md is about 1.2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The licence is Apache-2.0.

Example prompts

“logical fallacy”
“fallacy detection”
“sophistry”
“/logical-fallacy-detector”

What it can do on your machine

Read from SKILL.md and the folder at commit 8e8d35c. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Logical Fallacy Detector loads about 1.2k tokens when it runs. Until then it costs about 118 tokens; SKILL.md has 488 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~118
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from revfactory/harness-100 at commit 8e8d35c, republished under its Apache-2.0 licence (© revfactory). 488 words, ~1,226 tokens.

Download SKILL.mdSave it as .claude/skills/logical-fallacy-detector/SKILL.md (or your agent's skills folder).

name: logical-fallacy-detector
description: A specialized skill for identifying and correcting logical fallacies in debates. Used by judge and rapporteur agents to evaluate the logical soundness of both sides' arguments and point out errors. Automatically applied in contexts such as 'logical fallacy', 'fallacy detection', 'sophistry', 'argument evaluation', 'logic verification'. However, formal logic theorem proving and mathematical logic verification are outside the scope of this skill.

Logical Fallacy Detector — Logical Fallacy Detection Tool

A specialized skill that enhances the judge and rapporteur agents' argument evaluation capabilities.

Target Agents

judge — Argument evaluation, logical fallacy identification
rapporteur — Include logic quality analysis in comprehensive reports

Major Logical Fallacy Classification

A. Relevance Fallacies

Fallacy	Definition	Debate Example	How to Call It Out
Ad Hominem	Attacking the person instead of the argument	"Someone without experience has no valid opinion"	"Please evaluate the argument itself"
Appeal to Authority	Citing authorities outside their expertise	"A famous actor said so too"	"Do they have expertise in this field?"
Appeal to Popularity	Majority opinion = correct	"80% agree, so it must be right"	"Does majority opinion equal validity?"
Tu Quoque	"You do it too" as rebuttal	"You have the same problem"	"Your behavior does not invalidate the argument"
Straw Man	Distorting the opponent's claim to rebut it	"The opponent wants to eliminate all regulation"	"Please quote the original claim accurately"

B. Causal Fallacies

Fallacy	Definition	Example	How to Call It Out
Post Hoc	Temporal sequence = causation	"Crime dropped after the policy -> policy caused it"	"What about other variables?"
Correlation = Causation	Mistaking correlation for causation	"Ice cream sales up -> crime up"	"Have you considered a third variable (weather)?"
Slippery Slope	Assuming extreme consequences	"Allowing this will inevitably lead to ~"	"Please prove the probability of each step"

C. Structural Fallacies

Fallacy	Definition	Example	How to Call It Out
False Dilemma	Limiting options to only 2	"Either for or against, nothing else"	"Isn't there a third alternative?"
Circular Reasoning	Premise presupposes the conclusion	"This is right because it is right"	"Please provide independent evidence"
Hasty Generalization	Generalizing from insufficient cases	"One case was like this, so all are"	"Is the sample sufficient?"
False Analogy	Comparing fundamentally dissimilar things	"A national economy is like a household budget"	"What are the key differences between the two?"
Red Herring	Diverting to an unrelated topic	Presenting an emotional case unrelated to the topic	"Let's return to the original point"

Show full SKILL.md (162 more words)Show less

D. Evidence Fallacies

Fallacy	Definition	Example
Cherry Picking	Selecting only favorable data	Citing only success cases from certain countries
Appeal to Ignorance	No disproof = true	"There's no counter-evidence, so it must be true"
Inadequate Sample	Citing biased samples	Surveys with only voluntary participants

Judge Evaluation Rubric (Logic Quality)

Argument Soundness Assessment Matrix

Criterion	1-20 pts	21-40 pts	41-60 pts	61-80 pts	81-100 pts
Logical consistency	Multiple fallacies	3-4 fallacies	1-2 fallacies	Generally sound	Airtight logic
Evidence quality	No evidence	Weak evidence	Standard evidence	Quality evidence	Academic evidence
Rebuttal effectiveness	No rebuttal	Superficial rebuttal	Partial rebuttal	Effective rebuttal	Complete dismantling
Staying on point	Frequent digressions	Occasional digressions	Generally on topic	Mostly on topic	Perfectly on topic

Fallacy Penalty Standards

Severity	Penalty	Example
Minor	-2 pts	Slight exaggeration, unclear source
Moderate	-5 pts	Hasty generalization, weak analogy
Serious	-10 pts	Straw man attack, false dilemma
Critical	-15 pts	Circular reasoning, data manipulation

Fallacy Identification Expression Guide (for judge)

Point out accurately while maintaining respect:

"In the [side] debater's [Nth] argument, a [fallacy name] fallacy is observed.
 Specifically, [quotation]; this constitutes [explanation of why it is fallacious].
 To improve this, [direction for improvement] would be needed."

Files

Just SKILL.md in en/60-debate-simulator/.claude/skills/logical-fallacy-detector of revfactory/harness-100.

Open the folder on GitHubat commit 8e8d35c

Compare with similar skills

Logical Fallacy Detector next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Logical Fallacy Detector compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Logical Fallacy Detector this skillrevfactory/harness-100	1.3k	—	~1.2k	Automated safety check: Pass	Apache-2.0	6 mo ago
Logical Fallacy DetectorFerroxLabs/wayland	608	—	~4.1k	Automated safety check: Pass	Apache-2.0	yesterday
Correctcursor/plugins	10k	3 repos	~612	Automated safety check: Pass	None	today
CorrectionNxcoreAI/EverRoom	3k	—	~290	Automated safety check: Pass	Custom licence	yesterday
Logical Propertiesthedaviddias/Front-End-Checklist	74k	—	~526	Automated safety check: Pass	MIT	yesterday
Logic Reviewsickn33/agentic-awesome-skills	47k	1 repos	~3.5k	Automated safety check: Pass	MIT	yesterday

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Questions about Logical Fallacy Detector

What does Logical Fallacy Detector do?

A specialized skill for identifying and correcting logical fallacies in debates. Logical Fallacy Detector is an agent skill from revfactory/harness-100. A specialized skill for identifying and correcting logical fallacies in debates.

How do I install Logical Fallacy Detector in Claude Code?

Run `npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a claude-code`. Or copy the skill folder (en/60-debate-simulator/.claude/skills/logical-fallacy-detector in revfactory/harness-100) into .claude/skills/logical-fallacy-detector in your project. Claude Code loads it when a task matches its description.

How do I install Logical Fallacy Detector in Codex?

Run `npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a codex`. Or copy the skill folder (en/60-debate-simulator/.claude/skills/logical-fallacy-detector in revfactory/harness-100) into .agents/skills/logical-fallacy-detector in your project. Codex loads it when a task matches its description.

Can I use Logical Fallacy Detector in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add revfactory/harness-100 --skill logical-fallacy-detector -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/logical-fallacy-detector, .gemini/skills/logical-fallacy-detector, .github/skills/logical-fallacy-detector and .opencode/skills/logical-fallacy-detector in your project.

What does Logical Fallacy Detector need to run?

SKILL.md names no scripts, command-line tools or credentials: Logical Fallacy Detector is instructions for the agent only.

Does Logical Fallacy Detector access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Logical Fallacy Detector safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Logical Fallacy Detector use?

Logical Fallacy Detector is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Logical Fallacy Detector use?

About 1.2k tokens (SKILL.md is roughly 4.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Logical Fallacy Detector?

Skills that share tags, products or a category with Logical Fallacy Detector: Logical Fallacy Detector (FerroxLabs/wayland, 608 stars), Correct (cursor/plugins, 10k stars), Correction (NxcoreAI/EverRoom, 3k stars) and Logical Properties (thedaviddias/Front-End-Checklist, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Logical Fallacy Detector?

revfactory (a GitHub user) maintains it in revfactory/harness-100, which has 1,290 GitHub stars. The repository holds 464 skills in this directory. The repository was last updated on March 22, 2026.

Source: revfactory/harness-100 on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Logical Fallacy Detector

Facts

At a glance

What it does

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Logical Fallacy Detector — Logical Fallacy Detection Tool

Target Agents

Major Logical Fallacy Classification

A. Relevance Fallacies

B. Causal Fallacies

C. Structural Fallacies

D. Evidence Fallacies

Judge Evaluation Rubric (Logic Quality)

Argument Soundness Assessment Matrix

Fallacy Penalty Standards

Fallacy Identification Expression Guide (for judge)

Files

Compare with similar skills

Similar skills

More from revfactory/harness-100

Questions about Logical Fallacy Detector