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list-expander

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Expand a hard-to-build niche list from ~10 known-good seed companies into a full qualified TAM. Seed fingerprinting (how do good-fit companies ACTUALLY show up in the company database's filters) → lookalike generation (Prospeo company_lookalike, Exa findSimilar, Parallel.ai entity search) → filter mining with a precision/volume scorecard → wide pull with auto-sharding → cheap-AI qualification → live-website verification → client transparency report. Use when a vertical list feels "too small" (medical groups, hedge funds, Medicare brokerages), when known good-fit companies don't show up in keyword searches, or when someone says "expand this list", "the TAM should be bigger", "find more companies like these".

skills/list-expander/SKILL.md

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Oct 5, 2026
License
MIT

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# List Expander — seed companies → lookalikes → mined filters → qualified TAM

## The problem this solves

Niche lists come out tiny because we search databases with narrow explicit keywords, but real
good-fit companies (e.g. Atlantic Medical Group, Hackensack Meridian) often don't carry that
keyword in their database record. Instead of guessing keywords top-down, this skill works
bottom-up: take companies you KNOW fit, discover how the database actually tags them, expand via
lookalike engines, and only then derive the wide-net filters — with measured precision per filter
— before pulling and AI-qualifying at scale.

## Pipeline (5 phases)

All scripts live in `scripts/`, run with `npx tsx`, and are dependency-free (node ≥ 18 native
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