How to Generate Leads with Cold Email With Claude

Cold email leads start with a sized, verified list, and Claude can build the filters for you. Connect LeadOcean at https://api.leadocean.io/mcp first. Setup is on the MCP page.

The prompt

Build a cold email lead list: founders and C-level people at small
US marketing agencies.
1. Call leadocean_list_enum_values for industry, job_level and
   employee_range and use the exact strings.
2. Call leadocean_count_leads with jobLevel C-Team, industry
   Marketing Services, employeeRange 11-50 and country US.
3. Tell me the count and the filters you used.
4. Do not call leadocean_search_leads until I say go. Then pull 25
   people and show title, company size, industry and country.

What it resolves to

Enum values are exact strings, which is why step 1 looks them up. Industry has 534 values. "Marketing Services" and "Marketing and Advertising" are different strings, so Claude must pick one from the list.

How many match

4,107 mailable people matched on 2 October 2026. Filters: jobLevel C-Team, industry Marketing Services, employeeRange 11-50, country US.

Mailable means verified, catch_all_valid or catch_all, the count_leads default. The count is free. LeadOcean does not refund bounces, so read email_status on each row before you send. Send to verified first. Treat catch_all as a second batch, since the domain accepts all mail and a single address can still bounce.

The count also gates the spend. A wrong industry string shows up as an empty or bloated total before any record is used.

What you get back

Search rows carry the fields below. These are placeholder values, not real records.

Variations

• Change the size line to "employeeRange 51-200" to reach larger agencies.
• Swap the industry for "Software Development" and ask Claude to count again.
• Add "jobLevel VP" next to C-Team and compare the two counts before you pull rows.

Records it spends

The enum lookups and the count are free. leadocean_search_leads costs 1 record per person returned, so 25 rows cost 25 records. Free gives you 1,000 records one-off with no card. Pro is $499 a month. See pricing.

Related prompts

• Generate inbound leads
• Find prospects for cold email
• Cold email drafter skill

More prompts live in the prompts hub.