Agent skill · marketing growth · deanpeters
porters-five-forces
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.
Why this skill is useful
Provides a structured approach to analyzing market entry decisions with documented signals that the AI wouldn't generate reliably on its own.
What it needs
About 6k tokens when loaded. Last updated 2026-07-17. 6,302 stars on the source repository.
What this skill does
Porter's Five Forces (Evidence-Cited) Purpose Read an industry's structure through Porter's Five Forces, with evidence: search plan → force-by-force ratings with signals → profit-pool implication → next-step options. Each force — competitive rivalry, threat of new entrants, threat of substitutes, buyer power, supplier power — is rated weak/moderate/strong and justified with documented signals, because a rating without signals is vibes. The analysis closes where it should have been aiming all along: where the profit pool sits and who is squeezing it. Five forces is an argument about where margin goes, not a diagram for slide four. Input Works best with: the industry or segment, named as precisely as you can ("clinical data management SaaS," not "healthcare"), and the decision this analysis should support. Also useful: a geographic boundary if the structure differs by region, and a market-landscape-scan in session — the forces read builds on it and searches only gaps. Input supplied inline with the invocation — text after the skill name, a pasted context dump, or an appended ARGUMENTS: line — counts as answers already given. Use it against the question budget; don't re-ask. Arriving empty-handed? That works too. The skill opens with at most 3 questions (segment, decision, boundary) and proceeds on labeled assumptions if they go unanswered. Example invocation: Five forces on mid-market field-service management software, North America — decision: whether we enter or partner. Key Concepts Governing protocol: honors the autonomous-investigation contract — question budget of 3, search-plan gate, Fact/Inference/Assumption labels, Just Enough Mode (2-4 signals per force), stable schema, 4-option Final Step. Disciplines: FININT (concentration, margins, filings) + OSINT (analyst coverage, trade press) per intelligence-collection-disciplines. The framework (Porter, 1979): industry profitability is determined by five structural forces, not by how hard incumbents work. …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills deanpeters/porters-five-forces