# List Building Tips

> Use this skill when building B2B prospect lists, mixing data sources, running enrichment workflows, improving email coverage and bounce rates, cleaning and verifying lists before a campaign, or diagnosing data quality and prospecting efficiency problems.

- Skill: `swan-gtm/list-building-tips` (Agent Skill)
- Install (CLI): `npx skillmds@latest add swan-gtm/list-building-tips`
- Raw SKILL.md: https://api.skillmd.com/api/skills/swan-gtm/list-building-tips/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Marketing & Growth
- Author: swan-gtm (https://skillmd.com/u/swan-gtm)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/swan-gtm/list-building-tips

---


# List Building Pro Tips

## Core Principles

### 1. Mix Sources
- Don't rely on just one data provider
- Each source has different strengths/coverage
- Combine for maximum coverage

### 2. Scraping = Step 1
- Raw scraped data is just the beginning
- Still need Clay enrichment for:
  - Email verification
  - Phone numbers
  - Company data
  - Custom signals

### 3. Templates Are Modular
- Start with proven templates
- Adjust for specific campaign goals
- Don't rebuild from scratch

### 4. Don't Reinvent the Wheel
- Use existing Clay templates
- Modify rather than create
- Learn from what works

---

## Data Quality Hierarchy

```
1. Verified email (bounced < 2%)
2. Direct phone number
3. Recent activity signal
4. ICP fit confirmed
5. Company enrichment complete
```

---

## Efficiency Benchmarks

| Task | Manual Time | With Clay |
|------|-------------|-----------|
| 100 prospects | 8-10 hours | 30 min |
| 500 prospects | 40+ hours | 1-2 hours |
| 1000 prospects | 80+ hours | 2-3 hours |

---

## Quality Checklist

Before launching any campaign:

- [ ] Email bounce rate < 2%
- [ ] At least 70% email coverage
- [ ] ICP criteria verified
- [ ] Recent signals tagged
- [ ] Duplicates removed
- [ ] Competitor customers flagged
- [ ] Do-not-contact list checked

---

## Common Mistakes

1. **Single source reliance** - Limits coverage
2. **Skipping verification** - Kills deliverability
3. **Over-filtering** - Shrinks TAM too much
4. **Under-filtering** - Wastes outreach on bad fits
5. **Ignoring signals** - Missing hot prospects

---

## Combines with

| Skill | Why |
|-------|-----|
| `lead-sources-guide` | Choose right sources |
| `clay-enrichment-9step` | Full enrichment workflow |
| `email-metrics-benchmarks` | Track deliverability |
| `clay-buying-signals-5` | Add signals to lists |

## Example prompts

```
Review my list building workflow against the quality checklist.
```

```
What's the fastest way to build a 500-prospect list for fintech CFOs?
```

```
How do I diagnose why my email bounce rate is above 2%?
```


---

_Part of [Frontal](https://frontal.so) — free, open GTM skills for your AI agent. [Browse the library →](https://frontal.so/resources/skills)_