blitz-list-builder: Research & Knowledge for AI Agents | OpenAgentSkill

Overview

Use the Blitz API to find decision-makers at specific companies when you already have a list of company domains. Best for SMB owner-finding, domain-to-people lookup, or supplementing Prospeo results. Outputs a CSV you can feed to the email-waterfall or directly to /cold-email-starter-kit for Smartlead upload. Use when your targeting is company-first (not title-first).

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Blitz List Builder

Prospeo is title-first: "all VPs of Marketing in B2B SaaS." Blitz is domain-first: "for each of these 500 restaurant domains, find the owner."

If you already know the target companies (from Google Maps, a CSV of competitors, or a manually-curated list), Blitz finds the people for you.

When to use Blitz vs Prospeo

Your situation	Use
"I have 5,000 domains, find the owners"	Blitz
"Find all CFOs at US SaaS companies 100-500 employees"	Prospeo
"I need to supplement Prospeo results with additional contacts at the same companies"	Blitz
"I want the widest net possible in a vertical"	Prospeo
"I'm targeting specific named accounts (ABM)"	Blitz

Often: use Prospeo to build the initial list, then Blitz to add 1-2 more contacts per company.

Prerequisites

Blitz API key (env: BLITZ_API_KEY) — sign up at their website
List of target company domains (CSV with a company_domain column, or one domain per line)

Inputs

--domains-file=<path> — CSV or txt with company domains (one per line, or a column named company_domain)
--titles=<csv> — comma-separated title keywords to filter (default: owner,founder,ceo,president,cto,vp)
--out=<path> — CSV output path

Outputs

CSV with columns: company_domain, first_name, last_name, job_title, linkedin_url, email, email_source, company_name, company_industry, company_headcount, company_phone

Email will be populated when Blitz returns one. Use /email-waterfall skill on the output to fill in missing emails via Prospeo/ZenRows/etc.

Usage

export BLITZ_API_KEY=xxx

# Pull owner/founder/CEO contacts for 5000 SMB domains
npx tsx scripts/find-contacts.ts \
  --domains-file=restaurants.csv \
  --titles=owner,founder,ceo,general-manager \
  --out=restaurant-owners.csv

# Domain-first discovery with custom title match
npx tsx scripts/find-contacts.ts \
  --domains-file=saas-companies.txt \
  --titles=vp-marketing,head-of-growth,cmo,director-marketing \
  --out=saas-marketers.csv

API overview

Blitz has two main endpoints we use:

Company enrichment (find employees):

POST {BLITZ_BASE_URL}/api/enrichment/company
Body: { "domain": "acme.com" }
Response: { employees: [{ first_name, last_name, title, linkedin_url, email }], company: { name, industry, headcount, phone } }

Email enrichment (find email for a LinkedIn URL):

POST {BLITZ_BASE_URL}/api/enrichment/email
Body: { "linkedin_profile_url": "https://linkedin.com/in/..." }
Response: { email: "...", status: "verified" }

Rate limiting

The script throttles at 30 requests/second with concurrency 10. This matches Blitz's published limits. If you see 429s, lower the concurrency flag.

Hit rate expectations

Rough benchmarks (from real campaigns):

SMBs (restaurants, clinics, salons): 70-80% contact-found rate, 40-60% email-found
B2B tech (10-500 employees): 80-90% contact-found, 50-70% email-found
Enterprise (>1000 employees): 90%+ contact-found, but filtering for the RIGHT person matters more than the found-rate
Solo operators / micro-businesses: 30-50% — often no public LinkedIn

Title filtering — write specific keywords

Default keywords (owner, founder, ceo, president, cto, vp) are broad. Narrow them per campaign:

# Restaurants
--titles=owner,operator,general-manager

# SaaS RevOps
--titles=revops,revenue-operations,vp-sales,director-sales

# Dental practices
--titles=dentist,owner,practice-manager

# Law firms
--titles=partner,managing-partner,principal

The script does case-insensitive substring match. "vp" matches "VP Sales" but also "VP Product" — narrow further if that's too loose.

Common gotchas

Domain must be just the bare domain. Blitz wants acme.com, not https://acme.com/ or sub.acme.com.
Huge companies return truncated employee lists. Blitz caps at ~50-100 employees per domain. For enterprise-heavy lists, use Prospeo or LinkedIn search instead.
Stale LinkedIn data. Blitz's cache can be 3-12 months old. Job titles may have changed. Validate with the email waterfall.
No email returned ≠ person unreachable. 40% of hits have no email. Feed them to /email-waterfall — it'll try Prospeo + ZenRows.
Rate-limit errors. 429 = you hit the cap. Script retries with exponential backoff, but long bursts still fail.

Required step: Qualify with /icp-prompt-builder

This is a required step. Do not skip it.

Before pulling more than 500 companies' worth of contacts, sample ~50 and run /icp-prompt-builder on them:

Evaluates the first 10 with an AI qualification prompt
You give corrections ("this one should be NO because they're a competitor")
Refines the prompt, runs next 10
Stops after 2 rounds with zero corrections — prompt is tuned
Apply the tuned prompt to the remaining leads to filter before paying for email enrichment

Why it's required: Blitz contact-finding is cheap, but email enrichment downstream is not. A typical 5,000-contact run costs $150+ in email-finding API calls. If 40% of your list is wrong-fit, you burn ~$60 finding emails at companies that will never convert. The ICP prompt builder takes 10-15 min and saves that.

How to skip safely: you can't. If you're sure your list is already perfectly qualified (e.g., it came from a curated seed list of named accounts you want to pitch), run /icp-prompt-builder anyway on 10 of them and confirm your existing qualification matches — the prompt builder becomes a sanity check instead of a filter.

Cost

Per Blitz pricing (check their current rates):

Company enrichment: ~$0.02-0.05 per domain
Email enrichment: ~$0.05-0.10 per email

5,000 domains = ~$150 for contacts alone. Plan your budget.

Output → next step

Once you have the CSV, the typical flow:

Deduplicate — remove duplicate emails, duplicate LinkedIn URLs
Filter — drop rows where job_title doesn't cleanly match your ICP
Fill missing emails — run /email-waterfall on rows with empty email
Validate — run MillionVerifier on all emails (see /email-waterfall script)
Upload — pass to Smartlead via /cold-email-starter-kit script smartlead-add-leads.ts

Scripts

scripts/find-contacts.ts — main batch enrichment script

What to do next

Run /email-waterfall to fill in emails for rows Blitz didn't return. Then /list-quality-scorecard to grade the final list.

After the scorecard, proceed to /campaign-copywriting → /smartlead-campaign-upload-public.

Or wait: if the required /icp-prompt-builder step (above) showed <40% qualification rate, your source list of domains is off. Fix that before spending more Blitz credits.

/icp-prompt-builder — qualify the contacts this skill returns BEFORE running email waterfall
/prospeo-full-export — the title-first alternative
/google-maps-list-builder — for local-business domain lists
/disco-like — lookalike companies from seed domains
/email-waterfall — when Blitz doesn't return an email
/cold-email-starter-kit → 06-list-building-prospeo.md for broader list-building context

View source ↗

File metadata

name: blitz-list-builder
description: Use the Blitz API to find decision-makers at specific companies when you already have a list of company domains. Best for SMB owner-finding, domain-to-people lookup, or supplementing Prospeo results. Outputs a CSV you can feed to the email-waterfall or directly to /cold-email-starter-kit for Smartlead upload. Use when your targeting is company-first (not title-first).

View original text

---
name: blitz-list-builder
description: Use the Blitz API to find decision-makers at specific companies when you already have a list of company domains. Best for SMB owner-finding, domain-to-people lookup, or supplementing Prospeo results. Outputs a CSV you can feed to the email-waterfall or directly to /cold-email-starter-kit for Smartlead upload. Use when your targeting is company-first (not title-first).
---

# Blitz List Builder

Prospeo is title-first: "all VPs of Marketing in B2B SaaS." Blitz is domain-first: "for each of these 500 restaurant domains, find the owner."

If you already know the target companies (from Google Maps, a CSV of competitors, or a manually-curated list), Blitz finds the people for you.

## When to use Blitz vs Prospeo

| Your situation | Use |
|---|---|
| "I have 5,000 domains, find the owners" | Blitz |
| "Find all CFOs at US SaaS companies 100-500 employees" | Prospeo |
| "I need to supplement Prospeo results with additional contacts at the same companies" | Blitz |
| "I want the widest net possible in a vertical" | Prospeo |
| "I'm targeting specific named accounts (ABM)" | Blitz |

Often: use Prospeo to build the initial list, then Blitz to add 1-2 more contacts per company.

## Prerequisites

- Blitz API key (env: `BLITZ_API_KEY`) — sign up at their website
- List of target company domains (CSV with a `company_domain` column, or one domain per line)

## Inputs

- `--domains-file=<path>` — CSV or txt with company domains (one per line, or a column named `company_domain`)
- `--titles=<csv>` — comma-separated title keywords to filter (default: `owner,founder,ceo,president,cto,vp`)
- `--out=<path>` — CSV output path

## Outputs

CSV with columns: `company_domain, first_name, last_name, job_title, linkedin_url, email, email_source, company_name, company_industry, company_headcount, company_phone`

Email will be populated when Blitz returns one. Use `/email-waterfall` skill on the output to fill in missing emails via Prospeo/ZenRows/etc.

## Usage

```bash
export BLITZ_API_KEY=xxx

# Pull owner/founder/CEO contacts for 5000 SMB domains
npx tsx scripts/find-contacts.ts \
  --domains-file=restaurants.csv \
  --titles=owner,founder,ceo,general-manager \
  --out=restaurant-owners.csv

# Domain-first discovery with custom title match
npx tsx scripts/find-contacts.ts \
  --domains-file=saas-companies.txt \
  --titles=vp-marketing,head-of-growth,cmo,director-marketing \
  --out=saas-marketers.csv
```

## API overview

Blitz has two main endpoints we use:

**Company enrichment** (find employees):
```
POST {BLITZ_BASE_URL}/api/enrichment/company
Body: { "domain": "acme.com" }
Response: { employees: [{ first_name, last_name, title, linkedin_url, email }], company: { name, industry, headcount, phone } }
```

**Email enrichment** (find email for a LinkedIn URL):
```
POST {BLITZ_BASE_URL}/api/enrichment/email
Body: { "linkedin_profile_url": "https://linkedin.com/in/..." }
Response: { email: "...", status: "verified" }
```

## Rate limiting

The script throttles at **30 requests/second with concurrency 10**. This matches Blitz's published limits. If you see 429s, lower the concurrency flag.

## Hit rate expectations

Rough benchmarks (from real campaigns):
- **SMBs (restaurants, clinics, salons):** 70-80% contact-found rate, 40-60% email-found
- **B2B tech (10-500 employees):** 80-90% contact-found, 50-70% email-found
- **Enterprise (>1000 employees):** 90%+ contact-found, but filtering for the RIGHT person matters more than the found-rate
- **Solo operators / micro-businesses:** 30-50% — often no public LinkedIn

## Title filtering — write specific keywords

Default keywords (`owner, founder, ceo, president, cto, vp`) are broad. Narrow them per campaign:

```bash
# Restaurants
--titles=owner,operator,general-manager

# SaaS RevOps
--titles=revops,revenue-operations,vp-sales,director-sales

# Dental practices
--titles=dentist,owner,practice-manager

# Law firms
--titles=partner,managing-partner,principal
```

The script does case-insensitive substring match. "vp" matches "VP Sales" but also "VP Product" — narrow further if that's too loose.

## Common gotchas

- **Domain must be just the bare domain.** Blitz wants `acme.com`, not `https://acme.com/` or `sub.acme.com`.
- **Huge companies return truncated employee lists.** Blitz caps at ~50-100 employees per domain. For enterprise-heavy lists, use Prospeo or LinkedIn search instead.
- **Stale LinkedIn data.** Blitz's cache can be 3-12 months old. Job titles may have changed. Validate with the email waterfall.
- **No email returned ≠ person unreachable.** 40% of hits have no email. Feed them to `/email-waterfall` — it'll try Prospeo + ZenRows.
- **Rate-limit errors.** 429 = you hit the cap. Script retries with exponential backoff, but long bursts still fail.

## Required step: Qualify with /icp-prompt-builder

**This is a required step. Do not skip it.**

Before pulling more than 500 companies' worth of contacts, sample ~50 and run `/icp-prompt-builder` on them:

1. Evaluates the first 10 with an AI qualification prompt
2. You give corrections ("this one should be NO because they're a competitor")
3. Refines the prompt, runs next 10
4. Stops after 2 rounds with zero corrections — prompt is tuned
5. Apply the tuned prompt to the remaining leads to filter before paying for email enrichment

**Why it's required:** Blitz contact-finding is cheap, but email enrichment downstream is not. A typical 5,000-contact run costs $150+ in email-finding API calls. If 40% of your list is wrong-fit, you burn ~$60 finding emails at companies that will never convert. The ICP prompt builder takes 10-15 min and saves that.

**How to skip safely:** you can't. If you're sure your list is already perfectly qualified (e.g., it came from a curated seed list of named accounts you want to pitch), run `/icp-prompt-builder` anyway on 10 of them and confirm your existing qualification matches — the prompt builder becomes a sanity check instead of a filter.

## Cost

Per Blitz pricing (check their current rates):
- Company enrichment: ~$0.02-0.05 per domain
- Email enrichment: ~$0.05-0.10 per email

5,000 domains = ~$150 for contacts alone. Plan your budget.

## Output → next step

Once you have the CSV, the typical flow:

1. **Deduplicate** — remove duplicate emails, duplicate LinkedIn URLs
2. **Filter** — drop rows where `job_title` doesn't cleanly match your ICP
3. **Fill missing emails** — run `/email-waterfall` on rows with empty `email`
4. **Validate** — run MillionVerifier on all emails (see `/email-waterfall` script)
5. **Upload** — pass to Smartlead via `/cold-email-starter-kit` script `smartlead-add-leads.ts`

## Scripts

- `scripts/find-contacts.ts` — main batch enrichment script

## What to do next

**Run `/email-waterfall`** to fill in emails for rows Blitz didn't return. Then `/list-quality-scorecard` to grade the final list.

After the scorecard, proceed to `/campaign-copywriting` → `/smartlead-campaign-upload-public`.

**Or wait:** if the required `/icp-prompt-builder` step (above) showed <40% qualification rate, your source list of domains is off. Fix that before spending more Blitz credits.

## Related skills

- `/icp-prompt-builder` — qualify the contacts this skill returns BEFORE running email waterfall
- `/prospeo-full-export` — the title-first alternative
- `/google-maps-list-builder` — for local-business domain lists
- `/disco-like` — lookalike companies from seed domains
- `/email-waterfall` — when Blitz doesn't return an email
- `/cold-email-starter-kit` → `06-list-building-prospeo.md` for broader list-building context

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Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
The script excerpt shows a possible syntax truncation in readDomains (missing closing parenthesis), but this may be an artifact of the excerpt.
The SKILL.md references other skills (/email-waterfall, /icp-prompt-builder) that are not included, but this is acceptable as a workflow dependency.
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Source & usage notes

Indexed

Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: growthenginenowoslawski/coldoutboundskills
License: MIT
Version: 1.0.0
Last GitHub push: Aug 18, 2026
Registry updated: Sep 5, 2026
Instruction path: skills/blitz-list-builder/SKILL.md @ f24320d4ab3d

Version reported in registry metadata; check source releases before relying on it.

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      "Dependency or permission surface needs review",
      "Permission surface may require sandboxing",
      "The script excerpt shows a possible syntax truncation in readDomains (missing closing parenthesis), but this may be an artifact of the excerpt.",
      "The SKILL.md references other skills (/email-waterfall, /icp-prompt-builder) that are not included, but this is acceptable as a workflow dependency.",
      "Quality score needs review",
      "Permission surface needs review: secrets or environment access, shell or command execution",
      "Dependency/runtime risk: command execution surface, credential or environment access",
      "Permission surface: secrets or environment access, shell or command execution"
    ]
  },
  "safety_gate": {
    "tier": "blocked",
    "label": "Blocked for auto-install",
    "auto_install_policy": "block",
    "auto_install_allowed": false,
    "human_review_required": true,
    "blocked": true,
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first."
  },
  "quality": {
    "score": 75,
    "label": "Strong"
  },
  "supply": {
    "track": "Research and knowledge work",
    "scenario": "Research agents",
    "maintenance": "29d since push",
    "risk": "Needs review"
  },
  "alternative_skills": [],
  "do_not_use_when": [
    "teams that need a vendor-supported SLA",
    "production agents without a repository review",
    "The script excerpt shows a possible syntax truncation in readDomains (missing closing parenthesis), but this may be an artifact of the excerpt.",
    "No OpenAgentSkill engagement data yet",
    "High-risk permission hints: Shell or command execution, Secrets or environment access",
    "Dependency or permission surface needs review",
    "Permission surface may require sandboxing",
    "The SKILL.md references other skills (/email-waterfall, /icp-prompt-builder) that are not included, but this is acceptable as a workflow dependency."
  ],
  "agent_contract": {
    "task_input": "Use blitz-list-builder in an agent workflow",
    "recommended_action": "Do not auto-install. Inspect the source, dependencies, and permission surface first.",
    "install_policy": "block",
    "minimum_review_before_use": [
      "Trust: 68/100 Manual review",
      "Audit: 78/100 Needs review",
      "Safety: 38/100 Avoid automatic install",
      "Review repository, license, install command, and permission surface before production use."
    ],
    "expected_agent_output": {
      "selected_skill": "growthenginenowoslawski-blitz-list-builder (blitz-list-builder)",
      "install_command": "npx skills add growthenginenowoslawski/coldoutboundskills --skill blitz-list-builder",
      "risk_summary": "Needs review; Blocked for auto-install; Review before production",
      "verification_result": "Report the smallest successful task, files touched, warnings, and any missing setup."
    }
  },
  "outcome_feedback": {
    "endpoint": "https://www.openagentskill.com/api/agent/outcome",
    "method": "POST",
    "requires_resolve_event_id": true,
    "event_id_source": "Use install_receipt.outcome_feedback.event_id or feedback.event_id returned by /api/agent/resolve for the current task.",
    "expected_outcomes": [
      "success",
      "failed",
      "not_relevant",
      "blocked_by_risk",
      "setup_required"
    ],
    "payload_template": {
      "event_id": "<install_receipt.outcome_feedback.event_id or feedback.event_id from /api/agent/resolve>",
      "skill_slug": "growthenginenowoslawski-blitz-list-builder",
      "task": "Use blitz-list-builder in an agent workflow",
      "agent": "codex",
      "outcome": "success",
      "install_used": true,
      "risk_blocked": false,
      "setup_required": false,
      "task_success": true,
      "output_quality": 4,
      "error_type": null,
      "human_review_required": false,
      "workspace": "sandbox",
      "time_to_useful_ms": 120000,
      "notes": "Report the smallest successful task, setup friction, files touched, and risk notes."
    }
  },
  "endpoints": {
    "web": "https://www.openagentskill.com/skills/growthenginenowoslawski-blitz-list-builder",
    "api": "https://www.openagentskill.com/api/agent/skills/growthenginenowoslawski-blitz-list-builder",
    "audit": "https://www.openagentskill.com/skills/growthenginenowoslawski-blitz-list-builder/audit",
    "eval": "https://www.openagentskill.com/api/agent/evals?slug=growthenginenowoslawski-blitz-list-builder&task=Use%20blitz-list-builder%20in%20an%20agent%20workflow&max_risk=medium",
    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20blitz-list-builder%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
    "receipt": "https://www.openagentskill.com/api/agent/receipt?task=Use%20blitz-list-builder%20in%20an%20agent%20workflow&agent=codex&max_risk=medium&format=text",
    "install": "https://www.openagentskill.com/api/skills/growthenginenowoslawski-blitz-list-builder/install",
    "manifest": "https://www.openagentskill.com/api/registry/manifest/growthenginenowoslawski-blitz-list-builder"
  }
}

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Creator: growthenginenowoslawski
Source: growthenginenowoslawski/coldoutboundskills
Indexed by: OpenAgentSkill community index

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