Skills truthcheck

Verify claims, fact-check content, check URL trustworthiness, and trace claims to their origin using the TruthCheck CLI. Use when: (1) user asks to fact-check or verify a claim, (2) user wants to check if a URL/source is trustworthy, (3) user wants to trace where a claim originated, (4) user asks about misinformation or content verification. Requires: pip install truthcheck

install

source · Clone the upstream repo

git clone https://github.com/openclaw/skills

Claude Code · Install into ~/.claude/skills/

T=$(mktemp -d) && git clone --depth=1 https://github.com/openclaw/skills "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/baiyishr/truthcheck" ~/.claude/skills/clawdbot-skills-truthcheck && rm -rf "$T"

manifest: skills/baiyishr/truthcheck/SKILL.md

source content

TruthCheck Skill

AI content verification CLI. Verify claims, check URLs, and trace misinformation.

Installation

Via ClawHub (recommended):

npx clawhub install truthcheck

Manual:

pip install truthcheck

Commands

Verify a claim

truthcheck verify "claim text" --llm gemini

Returns TruthScore 0-100 with breakdown (publisher, content, corroboration, fact-checks)
```
--llm
```
is optional but improves accuracy
Add
```
--json
```
for structured output

Check URL trustworthiness

truthcheck check https://example.com
truthcheck check "text with multiple URLs"
truthcheck check -f file.txt

Detects hallucinated URLs that don't exist
Rates publisher credibility

Trace a claim to its origin

truthcheck trace "claim text"           # balanced, ~1-2 min
truthcheck trace "claim text" --quick   # fast, ~30 sec
truthcheck trace "claim text" --deep    # thorough, ~3-5 min

Finds original source and builds propagation tree

Look up a publisher

truthcheck lookup "publisher name"

Sync publisher database

truthcheck sync

Run periodically to keep publisher ratings current.

Interpreting TruthScore

Score	Label	Meaning
80-100	TRUE	Strong evidence supports the claim
60-79	POSSIBLY TRUE	Some supporting evidence, inconclusive
40-59	UNCERTAIN	Mixed or insufficient evidence
20-39	POSSIBLY FALSE	Evidence leans against the claim
0-19	FALSE	Strong evidence contradicts the claim

LLM Integration (Optional)

TruthCheck works without any LLM, but adding

--llm

improves content analysis accuracy.

truthcheck verify "some claim" --llm gemini    # recommended, fast & free tier
truthcheck verify "some claim" --llm openai    # GPT models
truthcheck verify "some claim" --llm anthropic # Claude models
truthcheck verify "some claim" --llm ollama    # local models, fully offline

Privacy: API keys are stored in your local environment only. TruthCheck never sends your keys to any external service — they are used solely for direct API calls to the respective LLM provider.

Environment Variables

Variable	When needed	Description
`GEMINI_API_KEY`	`--llm gemini`	Google AI API key (free tier available)
`OPENAI_API_KEY`	`--llm openai`	OpenAI API key
`ANTHROPIC_API_KEY`	`--llm anthropic`	Anthropic API key
`BRAVE_API_KEY`	`--search brave`	Brave Search API key

No keys needed for

--llm ollama

(runs locally) or default DuckDuckGo search.

Tips

Verify commands can take 15-60 seconds depending on search results
Without
```
--llm
```
: basic scoring using publisher reputation, corroboration, and fact-checks
With
```
--llm
```
: adds AI content analysis for better accuracy
```
--search brave
```
gives better search results than default DuckDuckGo
For batch verification, loop through claims individually