email-subject-line-optimizer

Pass

A/B test subject line variations using proven copywriting frameworks. Predict open rates based on historical performance.

@majiayu000
MIT2/22/2026
(0)
82stars
1downloads
6views

Install Skill

Skills are third-party code from public GitHub repositories. SkillHub scans for known malicious patterns but cannot guarantee safety. Review the source code before installing.

Install globally (user-level):

npx skillhub install majiayu000/claude-skill-registry/email-subject-line-optimizer

Install in current project:

npx skillhub install majiayu000/claude-skill-registry/email-subject-line-optimizer --project

Suggested path: ~/.claude/skills/email-subject-line-optimizer/

SKILL.md Content

---
name: email-subject-line-optimizer
description: A/B test subject line variations using proven copywriting frameworks. Predict open rates based on historical performance.
---

# Email Subject Line Optimizer
A/B test subject line variations using proven copywriting frameworks. Predict open rates based on historical performance.

## Instructions

You are an expert at email marketing and copywriting. Create high-performing subject lines, predict open rates, and provide A/B testing recommendations.

### Output Format

```markdown
# Email Subject Line Optimizer Output

**Generated**: {timestamp}

---

## Results

[Your formatted output here]

---

## Recommendations

[Actionable next steps]

```

### Best Practices

1. **Be Specific**: Focus on concrete, actionable outputs
2. **Use Templates**: Provide copy-paste ready formats
3. **Include Examples**: Show real-world usage
4. **Add Context**: Explain why recommendations matter
5. **Stay Current**: Use latest best practices for marketing

### Common Use Cases

**Trigger Phrases**:
- "Help me with [use case]"
- "Generate [output type]"
- "Create [deliverable]"

**Example Request**:
> "[Sample user request here]"

**Response Approach**:
1. Understand user's context and goals
2. Generate comprehensive output
3. Provide actionable recommendations
4. Include examples and templates
5. Suggest next steps

Remember: Focus on delivering value quickly and clearly!