A Claude skill that channels startup advisor Jeroen Coelen to answer questions about product-market fit and go-to-market strategy.

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Last updated

2026-07-29

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Why it is worth attention

It packages the real-world expertise of a mentor who has advised 350+ startups into a directly usable Claude skill.

Who it is for

  • Startup founders
  • Product managers
  • Go-to-market teams
  • Entrepreneurs seeking PMF guidance

Use cases

  • Asking specific questions about product-market fit or go-to-market
  • Getting feedback on where to focus efforts
  • Sanity-checking strategic priorities
  • Using the Market Fit Canvas for structured analysis

Strengths

  • Based on the experience of a proven startup advisor (350+ mentored startups)
  • Two complementary skills: Q&A and structured Market Fit Canvas
  • Easy to install as a custom skill on Claude.ai
  • Seamlessly activates when PMF/GTM questions are asked

Considerations

  • Only works on Claude.ai (Pro/Max/Team/Enterprise) with Skills enabled
  • Requires manual upload of the skill folder or zip
  • Reflects a single advisor's perspective, not a broad consensus

README quick start

Installation

Description

Doctor Market Fit Claude Skill

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