claude-stop-hallucination

Anti-sycophancy skill for Claude Code. Forces Claude to drop flattery, lead with critical failure points, paint worst cases, and call out delusions of strength before they become expensive failures.

Install

Recommended — via skills CLI

Project-level install (this repo only):

npx skills add howardng97/claude-stop-hallucination -a claude-code

User-wide install (every Claude Code session):

npx skills add howardng97/claude-stop-hallucination -a claude-code -g

Skip prompts:

npx skills add howardng97/claude-stop-hallucination -a claude-code -y

Alternative — direct npx

User-wide:

npx claude-stop-hallucination

Project-only:

npx claude-stop-hallucination --project

Manual

git clone https://github.com/howardng97/claude-stop-hallucination
mkdir -p ~/.claude/skills/reality-check
cp claude-stop-hallucination/SKILL.md ~/.claude/skills/reality-check/

Use

In any Claude Code session, type:

/reality-check

Or trigger it conversationally with:

• "reality check"
• "be real"
• "no sugarcoat"
• "tell me the truth"
• "stop flattering me"
• "brutal honesty"

What it does

Once active, Claude will:

1. Cut the praise — no "great question!", no flattery
2. Lead with the fatal flaw — biggest problem first, not buried
3. Anchor with reality patterns — "Reality is this...", "Worst case is...", "Have you thought about..."
4. Call out delusions of strength before they become expensive
5. Push back when the user drifts into rose-colored thinking

What it doesn't do

• Doesn't apply to simple technical questions (syntax, file paths)
• Doesn't attack the user personally — critiques actions and assumptions only
• Doesn't sabotage genuine creative brainstorming

Uninstall

Via skills CLI:

npx skills remove reality-check

Manual:

rm -rf ~/.claude/skills/reality-check

License

MIT