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Every resource founders actually use, in one library.

The essays, videos, podcasts, books and tools behind every answer across eChai's hubs, from starting up to go-to-market, D2C, founder money and AI, each with a note on why it is here.

What founders use most, ranked by how many answers lean on it.

  1. The implementation reference when you actually build it. docs.langchain.com Guide · How Founders Use AI Context engineering in agents (docs) LangChain
  2. Explains why agents get dumber as conversations get longer, and what to do. inkeep.com Article · How Founders Use AI Fighting Context Rot Inkeep
  3. The research evidence that performance degrades with input length. arxiv.org Article · How Founders Use AI Diagnosing and Mitigating Context Rot in Long-horizon Search arXiv researchers
  4. Reverse-engineers how Claude's own products manage context. 01.me Article · How Founders Use AI Claude's Context Engineering Secrets: Best Practices from Anthropic Bojie Li
  5. How a code-intelligence company feeds agents exactly the right slice of a codebase. sourcegraph.com Guide · How Founders Use AI Context Engineering: A Practical Guide for AI Agents Sourcegraph
  6. Connects context engineering to harness design in three principles. hugobowne.substack.com Article · How Founders Use AI AI Agent Harness, 3 Principles for Context Engineering, and the Bitter Lesson Revisited Hugo Bowne-Anderson
  7. Notes from the two leading teams comparing approaches live. medium.com Article · How Founders Use AI Inside the LangChain x Manus Webinar on Context Engineering Duarte Caldas Cardoso
  8. Where memory and context management are heading next. eu.36kr.com Article · How Founders Use AI Harrison Chase: 2026 ushers in long-horizon agents 36Kr (Harrison Chase interview)
  9. Video · How Founders Use AI Microsoft CPO: If you aren't prototyping with AI, you're doing it wrong (Aparna Chennapragada) Lenny's Podcast
  10. Turns scattered AI experiments into a repeatable prototyping workflow, with template prompts included. lennysnewsletter.com Guide · How Founders Use AI How to get your entire team prototyping with AI Colin Matthews (Lenny's Newsletter)
  11. Screen-share episode showing exactly how a prototype goes from generic mock to product-quality. creators.spotify.com Podcast · How Founders Use AI How to build prototypes that actually look like your product (Colin Matthews) How I AI with Claire Vo
  12. Video · How Founders Use AI Vibe Coding Is The Future Y Combinator (Lightcone Podcast)
  13. A serious operator's framework for where AI prototypes fit in the build-measure-learn loop. reforge.com Article · How Founders Use AI How to implement AI prototyping in your product development cycle Reforge
  14. Names the exact bottleneck this question is about and shows how solo founders route around it. venturebeat.com Article · How Founders Use AI The design bottleneck for solo founders? AI has solved it VentureBeat
  15. Grounded reporting on founders using AI to compress idea-to-prototype from weeks to days. technical.ly Article · How Founders Use AI For technical founders, AI is becoming the bridge between product ideas and prototypes Technical.ly
  16. An honest boundary-setting read so you prototype with AI without overestimating it. techfornontechies.co Article · How Founders Use AI What AI can (and can't) do for non-technical founders Tech For Non-Techies
  17. Lovable's founding designer on why prototype-first changes what founders should expect from design. open.spotify.com Podcast · How Founders Use AI Nad Chishtie: a new way to design and build with AI Dive Club (Ridd)
  18. The macro picture: prototype-built companies are raising real money, fast. forbes.com Article · How Founders Use AI Y Combinator's AI revolution and the rise of startups built by vibe coding Forbes (Josipa Majic)
  19. A designer's real workflow for prototyping with AI, summarized with the episode link. linkedin.com Thread · How Founders Use AI How I AI episode 4: Joel Unger on AI for design and prototyping Claire Vo
  20. A practical argument for validating with AI prototypes before any hire, design or engineering. pre.dev Article · How Founders Use AI To prototype with AI, founders don't need developers or tech skills pre.dev
  21. Founder-specific starting point with real stories of non-technical founders shipping first drafts themselves. lovable.dev Tool · How Founders Use AI Lovable for founders Lovable
  22. Video · How Founders Use AI v0 Tutorial from the CPO: AI prototype like a pro Vercel
  23. Video · How Founders Use AI Vercel's VP of Product on how to use v0 to build your own ideas Lee Robinson (Vercel)
  24. The fastest structured on-ramp if you have never touched an AI builder. codecademy.com Guide · How Founders Use AI v0 by Vercel: build an app in 10 minutes Codecademy

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1046 questions GTM Go-to-market, from breaking in to how the best teams do it. 352 questions D2C Building a direct-to-consumer brand, India-first. 482 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 154 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 278 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 390 terms
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