/start-14-6.en

description: "Lesson command"
chapter: "courses/aiagent/lesson03-core/module14-article-writing/chapter.yaml"
category: "lesson"
duration: "~30 min"
prerequisites: ["start-14-5"]
level: "intermediate"
tags: ["article", "factcheck"]
nonInteractiveMode: deferred

🎓 Lesson 14-6: Fact-Checking - Fact Verification Agent

📍 What You'll Do

Welcome to **Lesson 14-6: Fact-Checking - Fact Verification Agent**!

| Item | Details | |------|---------| | Goal | Verify factual claims in the article using the fact-checking agent and add citations | | Duration | ~30 min | | Skills Used | fact-checker | | Prerequisites | Gemini API key configured, Lesson 14-5 (proofread draft) complete | | Course Page | Refer to [Module 14: Article Writing](https://ai-agent.camp/en/course/module-14) in parallel |

**Session flow:** 1. Understand the fact-check target categories 2. Run fact verification with fact-checker 3. Review verification results and add citations to the article

By the end of this session, a fact-verified article with citations will be complete.

> **💡 Hint**: If the AI response stops midway, type "please continue" or "it stopped" to resume. Responses may pause depending on the tool, but this is not a malfunction.

---

🎯 Readiness Check

First, let's confirm everything is ready.

**AskQuestion settings:**

{
  "title": "🎯 Pre-Session Check",
  "questions": [{
    "id": "readiness",
    "prompt": "Are you ready?",
    "options": [
      {"id": "ready", "label": "Ready! Let's start"},
      {"id": "check_prereq", "label": "I want to check the prerequisites"},
      {"id": "view_html", "label": "I want to see the course page first"},
      {"id": "different_lesson", "label": "I want to go to a different lesson"}
    ]
  }]
}

(ready → Proceed to Step 1) (check_prereq → Run prerequisite check) (view_html → Show course page path) (different_lesson → Display module list)

---

🚀 Step 1: Understand Fact-Check Target Categories

In Codex, you typically select from choices in chat: "Continue / Review examples / Skip".

**AskQuestion settings example:**

{
  "title": "🚀 Step 1: Understand Fact-Check Categories",
  "questions": [{
    "id": "step_action",
    "prompt": "What would you like to do with this step?",
    "options": [
      {"id": "practice", "label": "Continue"},
      {"id": "review", "label": "Just review examples"},
      {"id": "skip", "label": "Skip"}
    ]
  }]
}

**Post-selection instructions (example)**: Input:

Explain the 5 categories verified by the fact-checking agent.

1. Numbers and statistics: Accuracy of values like "X%", "X times", "X billion yen"
2. Dates and timelines: Accuracy of dates like "started in year X", "released in month X"
3. Proper nouns: Spelling and official names of companies, products, and people
4. Causal relationships: Validity of claims like "X caused Y"
5. Citations and references: Verification of sources for claims like "according to X", "a study by X shows"

Explain the specific verification methods and common error patterns for each category.

**Expected result**: Details of the 5 verification categories and common error patterns are explained.

---

🚀 Step 2: Run Fact Verification with fact-checker

In Codex, you typically select from choices in chat: "Continue / Review examples / Skip".

**AskQuestion settings example:**

{
  "title": "🚀 Step 2: Run Fact-Check",
  "questions": [{
    "id": "step_action",
    "prompt": "What would you like to do with this step?",
    "options": [
      {"id": "practice", "label": "Continue"},
      {"id": "review", "label": "Just review examples"},
      {"id": "skip", "label": "Skip"}
    ]
  }]
}

**Post-selection instructions (example)**: Input:

Use the fact-checker skill to fact-check the proofread article.

Execution command:
python skills/fact-checker/scripts/fact_checker.py --input output/article-14-5-proofread.md --output output/article-14-6-factcheck.json

Target file: output/article-14-5-proofread.md

Verify across all 5 categories:
1. Numbers and statistics
2. Dates and timelines
3. Proper nouns
4. Causal relationships
5. Citations and references

Output the following for each claim:
- Relevant text (with line number)
- Category
- Verification result: Verified / Needs review / Error / Source unknown
- Correct information (if error)
- Recommended source URL (if available)

Save the results to output/article-14-6-factcheck.json.

**Expected result**: All factual claims in the article are verified across 5 categories, with results output in JSON format.

---

🚀 Step 3: Review Results and Add Citations

In Codex, you typically select from choices in chat: "Continue / Review examples / Skip".

**AskQuestion settings example:**

{
  "title": "🚀 Step 3: Add Citations",
  "questions": [{
    "id": "step_action",
    "prompt": "What would you like to do with this step?",
    "options": [
      {"id": "practice", "label": "Continue"},
      {"id": "review", "label": "Just review examples"},
      {"id": "skip", "label": "Skip"}
    ]
  }]
}

**Post-selection instructions (example)**: Input:

Based on the verification results in output/article-14-6-factcheck.json,
apply the following corrections to the article.

1. "Error" claims: Correct with accurate information
2. "Needs review" claims: Change to cautious wording (e.g., "it is said that...")
3. "Source unknown" citations: Add sources or remove the citation
4. "Verified" claims: Add sources as footnotes

Place all citations at the end of the article:
## References
1. [Source title](URL) - Description of referenced section
2. ...

Save the result to output/article-14-6-factchecked.md.

**Expected result**: Fact verification corrections are applied and the article with citations is saved.

---

⚠️ Common Issues and Solutions

In Codex, you typically present choices in chat so the user can select their issue and get guidance instantly.

**AskQuestion settings