Claude Prompt: Size My TAM From One Sentence

Describe your market in one sentence. Claude maps it to LeadOcean filters and counts the people. It works in any MCP client connected to https://api.leadocean.io/mcp. Setup is on the MCP page.

The prompt

My market: VPs of Sales at US software companies with 51-200 employees.
1. Call leadocean_list_enum_values for industry, employee_range,
   job_level and job_function. Use only the exact strings it returns.
2. Call leadocean_count_leads with those filters and facets false.
   Tell me the number and say what it counts.
3. Show a table: filter, value.
4. Call leadocean_search_leads with the same filters, limit 5.
   Show title, company size, industry and country only.
5. Say in one line if the count looks too wide or too narrow.

Swap the first line for your own sentence. The steps stay the same.

What it resolves to

"Software companies" has seven industry values, such as Computer Software and Software Development. Claude picks one, so name the exact industry if you want a wider net.

How many match

1,603 mailable people matched on 2 October 2026. Filters: industry Software Development, employeeRange 51-200, country US, jobLevel VP, jobFunction Sales & Business Development. Mailable means verified, catch_all_valid or catch_all, the count_leads default.

The count is free. It sizes people, not companies, so one company can add more than one VP. Rerun it with Computer Software added to see how much the list grows.

What you get back

These are placeholder values, not real records.

Variations

• Wider: "Directors and VPs of Sales at US software companies with 51-500 employees." Claude adds Director and the 201-500 range.
• Different region: "Heads of Marketing at fintech companies in Germany and France." Claude resolves two country codes and an industry.
• Companies, not people: "How many US software companies with 51-200 employees?" Claude uses leadocean_search_companies, which costs 1 record per company returned, so keep the limit low.

Records it spends

leadocean_list_enum_values and leadocean_count_leads are free. leadocean_search_leads costs 1 record per person returned, so limit 5 costs up to 5. Free gives you 1,000 records one-off with no card. Pro is $499 a month. See pricing.

Related prompts

• Build a buying committee for one account
• Build an ICP for B2B
• Find ICP-matched leads

For the full method, read size your TAM in Claude or in Claude Code. More prompts live in the prompts hub.