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Agent Skill

Porters Five Forces skill

porters-five-forcesdeanpeters/Product-Manager-Skillsskills/porters-five-forces/SKILL.md

Read an industry's structure through Porter's Five Forces with documented signals per rating, ending at the profit pool. Use when weighing market entry or when margins erode and nobody can say why.

7.6k

always on

43 tokname + description

once used

2,212 tokSKILL.md body

bundled files

315 KB

repo stars

7.6kGitHub

Install the Porters Five Forces skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/deanpeters/Product-Manager-Skills --skill porters-five-forces

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/deanpeters/Product-Manager-Skills.git /tmp/Product-Manager-Skills
mkdir -p ~/.claude/skills
cp -R /tmp/Product-Manager-Skills/skills/porters-five-forces ~/.claude/skills/porters-five-forces

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description43 tok
When the agent uses itThe SKILL.md instructions2,212 tok
Only if opened3 bundled files (15 KB)varies

Until it is used, porters-five-forces costs about 32× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 77 skills from deanpeters/Product-Manager-Skills would load 2,883 tokens of descriptions. Skills vs MCP study

Checks

Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • Porter's Five Forces (Evidence-Cited)
  • Purpose
  • Input
  • Key Concepts
  • Application
  • Output schema (do not reorder)
  • Final Step (offer exactly 4 options)
  • Examples
  • Common Pitfalls
  • References

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