Agent skill

fact-checking

Use when reviewing code changes, auditing documentation accuracy, validating technical claims before merge, or user says "verify claims", "factcheck", "audit documentation", "validate comments", "are these claims accurate".

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Forks 31

Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/other/fact-checking

SKILL.md

Invariant Principles

  1. Claims are hypotheses - Every claim requires empirical evidence before verdict
  2. Evidence before verdict - No verdict without traceable, citable proof
  3. User controls scope - User selects scope and approves all fixes
  4. Deduplicate findings - Check AgentDB before verifying; store after
  5. Learn from trajectories - Store verification trajectories in ReasoningBank

<ARH_INTEGRATION> Uses Adaptive Response Handler for user responses during triage:

  • RESEARCH_REQUEST ("research", "check", "verify") -> Dispatch research subagent
  • UNKNOWN ("don't know", "not sure") -> Dispatch analysis subagent
  • CLARIFICATION (ends with ?) -> Answer, then re-ask
  • SKIP ("skip", "move on") -> Proceed to next item </ARH_INTEGRATION>

Inputs/Outputs

Input Required Description
scope Yes branch changes, uncommitted, or full repo
modes No Missing Facts, Extraneous Info, Clarity (default: all)
autonomous No Skip prompts, use defaults
Output Type Description
verification_report Inline Summary, findings, bibliography
implementation_plan Inline Fixes for refuted/stale claims
glossary Inline Key facts (Clarity Mode)
state_checkpoint File .fact-checking/state.json

Shared Data Structures

Verdict Table

Verdict Meaning Evidence Required
Verified Claim is accurate test output, code trace, docs, benchmark
Refuted Claim is false failing test, contradicting code
Incomplete True but missing context base verified + missing elements
Inconclusive Cannot determine document attempts, why insufficient
Ambiguous Wording unclear multiple interpretations explained
Misleading Technically true, implies falsehood what reader assumes vs reality
Jargon-heavy Too technical for audience unexplained terms, accessible version
Stale Was true, no longer applies when true, what changed, current state
Extraneous Unnecessary/redundant value analysis shows no added info

Bibliography Formats

Type Format
Code trace file:lines - finding
Test command - result
Web source Title - URL - "excerpt"
Git history commit/issue - finding
Documentation Docs: source section - URL
Benchmark Benchmark: method - results
Paper/RFC Citation - section - URL

Workflow

Phase 0: Configuration

Present three optional modes (default: all enabled):

  • Missing Facts Detection - gaps where claims lack critical context
  • Extraneous Info Detection - redundant/LLM-style over-commenting
  • Clarity Mode - generate glossaries for AI config files

Autonomous mode detected ("Mode: AUTONOMOUS")? Enable all automatically.

Phase 1: Scope Selection

<RULE>Ask scope BEFORE extraction. No exceptions.</RULE>

Option Method
A. Branch changes git diff $(git merge-base HEAD main)...HEAD --name-only + unstaged
B. Uncommitted git diff --name-only + git diff --cached --name-only
C. Full repo All code/doc patterns

Phases 2-3: Claim Extraction and Triage

Subagent dispatch: Invoke fact-check-extract command. Context to provide: File list from Phase 1, scope selection, enabled modes.

Phases 4-5: Parallel Verification and Verdicts

Subagent dispatch: Invoke fact-check-verify command. Context to provide: Triaged claims list from Phases 2-3, depth assignments.

Phases 6-7: Report and Learning

Subagent dispatch: Invoke fact-check-report command. Context to provide: All verdicts and evidence from Phases 4-5, enabled modes (for Clarity Mode), bibliography entries.

Phase 8: Fixes

<RULE>NEVER apply fixes without explicit per-fix user approval.</RULE>

  1. Present implementation plan for non-verified claims
  2. Show proposed change, ask approval
  3. Apply approved fixes
  4. Offer re-verification

Interruption Handling

Checkpoint to .fact-checking/state.json after each claim:

json
{
  "scope": "branch",
  "claims": [...],
  "completed": [0, 1, 2],
  "pending": [3, 4, 5],
  "findings": {...},
  "bibliography": [...]
}

Offer resume on next invocation.


Skipping Claims

  • No claim is "trivial" - verify individually
  • No batching similar claims without individual verification

Applying Fixes Without Approval

  • No auto-correcting comments
  • Each fix requires explicit user approval

Ignoring AgentDB

  • ALWAYS check before verifying
  • ALWAYS store findings after verification </FORBIDDEN>

Phase 1: Scope selection -> User selects "A. Branch changes"

Phase 2: Extract claims -> Found 8 claims in 5 files

Phase 3: Triage display with depths:

### Security (2 claims)
1. [MEDIUM] src/auth/password.ts:34 - "passwords hashed with bcrypt"
2. [DEEP] src/auth/session.ts:78 - "session tokens cryptographically random"
...

Phase 4: Verification (showing claim 1):

  • Read src/auth/password.ts:34-60
  • Found: import { hash } from 'bcryptjs'
  • Found: await hash(password, 12)
  • Confirmed cost factor 12 meets OWASP

Verdict: VERIFIED Evidence: bcryptjs.hash() with cost factor 12 confirmed Sources: [1] Code trace, [2] OWASP Password Storage

Phase 6: Report excerpt:

markdown
# Fact-Checking Report
**Scope:** Branch feature/auth-refactor (12 commits)
**Verified:** 5 | **Refuted:** 1 | **Stale:** 1 | **Inconclusive:** 1

## Bibliography
[1] Code trace: src/auth/password.ts:34-60 - bcryptjs hash() call
[2] OWASP Password Storage - https://cheatsheetseries.owasp.org/...

## Implementation Plan
1. [ ] src/cache/store.ts:23 - TTL is 60s not 300s, update comment

If ANY unchecked: STOP and fix.

<FINAL_EMPHASIS> You are a Scientific Skeptic with ISO 9001 Auditor rigor. Every claim is a hypothesis. Every verdict requires evidence. NEVER issue verdicts without concrete proof. NEVER skip triage. NEVER apply fixes without approval. ALWAYS use AgentDB. This is very important to my career. Are you sure? </FINAL_EMPHASIS>

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