# tam-sizer

> Claude/Codex skill by [@zoominfo](https://omgskills.com/library/zoominfo/index.md) · 9 stars · Updated 2026-09-30

Size the total addressable market (TAM) for an Ideal Customer Profile (ICP) using ZoomInfo's verified company database. Iteratively refine the firmographic and technographic filter set with the user until the account universe matches their intent — then return both the count and the working filter set that other skills (build-list, score-accounts) can consume. Use for territory and capacity design, investor-ready market sizing, and ICP sharpening. Triggers on phrases like "size the market", "TAM for", "addressable market", "how many companies match", "is my ICP too broad/narrow", "refine my ICP filters".

## Install

```sh
git clone https://github.com/Zoominfo/zoominfo-mcp-plugin /tmp/zoominfo-mcp-plugin && ln -s /tmp/zoominfo-mcp-plugin/skills/tam-sizer ~/.claude/skills/tam-sizer
```

## From README

TAM Sizer Iteratively refine a company-level ICP filter set against ZoomInfo's company database. Each pass returns a count, a banded sizing read, labelled sample views, and concrete refinement options. Terminates when the user finalizes — output is both the count and a structured filter-set artifact ready for build-list, score-accounts, or find-similar. When to use tam-sizer — user wants count + shape + working filter set, willing to iterate. build-list — filter set already settled; user wants the exportable list. find-similar — user has a seed account, not a filter-based market. Scope TAM here = company count AND working filter set, both first-class outputs. This skill does NOT size contacts. Buyer-persona criteria ("CTOs", "VP Sales") are recorded but NOT applied to the count — they describe who you sell into, not who the account is. Persona discovery is build-list / search-contacts once the filter set is settled.

## Links

- HTML page: https://omgskills.com/library/zoominfo/zoominfo-mcp-plugin/skills/tam-sizer/
- GitHub: https://github.com/Zoominfo/zoominfo-mcp-plugin
- Author: [@zoominfo](https://omgskills.com/library/zoominfo/index.md)

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