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Agent skill

Market Sizing Analysis

by wshobson in wshobson/agents

Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies.

MITAuto-check passedProduct & Project Management

Install Market Sizing Analysis

skills CLI
$ npx skills add wshobson/agents --skill market-sizing-analysis -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install wshobson/agents market-sizing-analysis --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/wshobson/agents.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/startup-business-analyst/skills/market-sizing-analysis .claude/skills/market-sizing-analysis && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
market-sizing-analysis
GitHub stars
40k
Used in
1 other repo
Token cost
~620 tokens
SKILL.md length
258 words
Files
4 (incl. references)
Skills in repo
142
Repo updated
First seen
Licence
MIT

At a glance

Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies.

  • Estimating addressable revenue
  • SKILL.md covers Overview, Core Concepts and Detailed patterns and worked…
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Validating market opportunity for a new venture

What it does

Market Sizing Analysis is an agent skill from wshobson/agents. Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building investor-ready market analysis for a startup pitch or business plan.

Its SKILL.md is about 620 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `examples/saas-market-sizing.md`, `references/data-sources.md` and `references/details.md`).

It sits in Product & Project Management, covering Startup and business strategy, Market sizing and Market research. The repository describes itself as: Multi-harness agentic plugin marketplace for Claude Code, Codex, Cursor, OpenCode, GitHub Copilot, Google Antigravity, and Pi. The licence is MIT.

When your agent uses it

  • Estimating addressable revenue
  • Validating market opportunity for a new venture
  • Building investor-ready market analysis for a startup pitch

Example prompts

  • “/market-sizing-analysis”

What it can do on your machine

Read from SKILL.md and the folder at commit 46891e7. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Market Sizing Analysis loads about 620 tokens when it runs, and up to ~5.2k if it reads all its reference files. Until then it costs about 82 tokens; SKILL.md has 258 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~82
When it runs · the whole SKILL.md, loaded when a task matches
~620
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from wshobson/agents at commit 46891e7, republished under its MIT licence (© wshobson). 258 words, ~620 tokens.

Download SKILL.mdSave it as .claude/skills/market-sizing-analysis/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
market-sizing-analysis
description
Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Use this skill when sizing markets, estimating addressable revenue, validating market opportunity for a new venture, or building investor-ready market analysis for a startup pitch or business plan.
version
1.0.0

Market Sizing Analysis

Comprehensive market sizing methodologies for calculating Total Addressable Market (TAM), Serviceable Available Market (SAM), and Serviceable Obtainable Market (SOM) for startup opportunities.

Overview

Market sizing provides the foundation for startup strategy, fundraising, and business planning. Calculate market opportunity using three complementary methodologies: top-down (industry reports), bottom-up (customer segment calculations), and value theory (willingness to pay).

Core Concepts

The Three-Tier Market Framework

TAM (Total Addressable Market)

  • Total revenue opportunity if achieving 100% market share
  • Defines the universe of potential customers
  • Used for long-term vision and market validation
  • Example: All email marketing software revenue globally

SAM (Serviceable Available Market)

  • Portion of TAM targetable with current product/service
  • Accounts for geographic, segment, or capability constraints
  • Represents realistic addressable opportunity
  • Example: AI-powered email marketing for e-commerce in North America

SOM (Serviceable Obtainable Market)

  • Realistic market share achievable in 3-5 years
  • Accounts for competition, resources, and market dynamics
  • Used for financial projections and fundraising
  • Example: 2-5% of SAM based on competitive landscape
When to Use Each Methodology

Top-Down Analysis

  • Use when established market research exists
  • Best for mature, well-defined markets
  • Validates market existence and growth
  • Starts with industry reports and narrows down

Bottom-Up Analysis

  • Use when targeting specific customer segments
  • Best for new or niche markets
  • Most credible for investors
  • Builds from customer data and pricing

Value Theory

  • Use when creating new market categories
  • Best for disruptive innovations
  • Estimates based on value creation
  • Calculates willingness to pay for problem solution

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

© wshobson, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in plugins/startup-business-analyst/skills/market-sizing-analysis of wshobson/agents.

  • SKILL.md
  • examples/saas-market-sizing.md
  • references/data-sources.md
  • references/details.md

Open the folder on GitHubat commit 46891e7

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in wshobson/agents, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Market Sizing Analysis next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Market Sizing Analysis compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Market Sizing Analysis this skillwshobson/agents40k1 repos~620Automated safety check: PassMIT
Market AnalyzerMathews-Tom/armory328—~2.4kAutomated safety check: PassMIT
Market Researchshawnpang/startup-founder-skills342—~1.9kAutomated safety check: PassMIT
TAM SAM SOM Calculatordeanpeters/Product-Manager-Skills7.2k1 repos~4.8kAutomated safety check: PassCustom licence
Startup Designferdinandobons/startup-skill1.2k—~8.1kAutomated safety check: PassMIT
Market Research Analysismanojbajaj95/claude-gtm-plugin105—~2.6kAutomated safety check: PassMIT

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Categories

Questions about Market Sizing Analysis

What does Market Sizing Analysis do?

Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies. Market Sizing Analysis is an agent skill from wshobson/agents. Calculate TAM/SAM/SOM for market opportunities using top-down, bottom-up, and value theory methodologies.

When should I use Market Sizing Analysis?

Market Sizing Analysis fits situations like: estimating addressable revenue; validating market opportunity for a new venture; building investor-ready market analysis for a startup pitch.

How do I install Market Sizing Analysis in Claude Code?

Run `npx skills add wshobson/agents --skill market-sizing-analysis -a claude-code`. Or copy the skill folder (plugins/startup-business-analyst/skills/market-sizing-analysis in wshobson/agents) into .claude/skills/market-sizing-analysis in your project. Claude Code loads it when a task matches its description.

How do I install Market Sizing Analysis in Codex?

Run `npx skills add wshobson/agents --skill market-sizing-analysis -a codex`. Or copy the skill folder (plugins/startup-business-analyst/skills/market-sizing-analysis in wshobson/agents) into .agents/skills/market-sizing-analysis in your project. Codex loads it when a task matches its description.

Can I use Market Sizing Analysis in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add wshobson/agents --skill market-sizing-analysis -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/market-sizing-analysis, .gemini/skills/market-sizing-analysis, .github/skills/market-sizing-analysis and .opencode/skills/market-sizing-analysis in your project.

What does Market Sizing Analysis need to run?

SKILL.md names no scripts, command-line tools or credentials: Market Sizing Analysis is instructions for the agent only.

Does Market Sizing Analysis access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Market Sizing Analysis safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Market Sizing Analysis use?

Market Sizing Analysis is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Market Sizing Analysis use?

About 620 tokens (SKILL.md is roughly 2.5k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.5k tokens, read only when the agent opens those files.

What are the alternatives to Market Sizing Analysis?

Skills that share tags, products or a category with Market Sizing Analysis: Market Analyzer (Mathews-Tom/armory, 328 stars), Market Research (shawnpang/startup-founder-skills, 342 stars), TAM SAM SOM Calculator (deanpeters/Product-Manager-Skills, 7.2k stars) and Startup Design (ferdinandobons/startup-skill, 1.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Market Sizing Analysis?

wshobson (a GitHub user) maintains it in wshobson/agents, which has 40,305 GitHub stars. The repository holds 142 skills in this directory. The repository was last updated on October 5, 2026.

Source: wshobson/agents on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.