Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add swan-gtm/gtm-skills --skill list-building-tipsgit clone --depth 1 https://github.com/swan-gtm/gtm-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/swan-gtm/gtm-skills/list-building-tips)<a href="https://agentmods.dev/skills/swan-gtm/gtm-skills/list-building-tips"><img src="https://agentmods.dev/badge/skills/swan-gtm/gtm-skills/list-building-tips/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/swan-gtm/gtm-skills/list-building-tips"><img src="https://agentmods.dev/badge/skills/swan-gtm/gtm-skills/list-building-tips.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00049 | $0.00639 |
| Opus 5 | $0.00024 | $0.00319 |
| Sonnet 5 | $0.00010 | $0.00128 |
| Haiku 4.5 | $0.00005 | $0.00064 |
Grade A, and why
list-building-tips scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 13d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
- Single source reliance - Limits coverage
- Skipping verification - Kills deliverability
- Over-filtering - Shrinks TAM too much
- Under-filtering - Wastes outreach on bad fits
- 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%?
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 13d ago First seen · 110 lines · 49 tokens per session scan A 0032d7b4010f
list-building-tips is a skill published in the GitHub repository swan-gtm/gtm-skills (150 stars, last pushed 2d ago), licensed MIT. It adds 49 tokens to every session and 639 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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