Explore · The library

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. Saves you from the premature self-host-a-model cost trap. ml6.eu Article · How Founders Use AI Why 'Cheaper Tokens' Isn't a Good Reason to Own Your LLMs ML6
  2. Why the price curve should keep falling, and what that means for your roadmap. weightythoughts.com Article · How Founders Use AI AI's Plummeting Prices Are a Software Story, Not a Hardware One Weighty Thoughts
  3. The clearest official explanation of what an agent eval actually is. anthropic.com Guide · How Founders Use AI Demystifying evals for AI agents Anthropic
  4. The philosophy behind the top-grossing evals course, free to read. hamelhusain.substack.com Article · How Founders Use AI AI Evals For Engineers & Product Managers Hamel Husain
  5. The 60-second version of why evals became the must-have skill. x.com Thread · How Founders Use AI Lenny on evals: watch them build one live Lenny Rachitsky
  6. Written notes of the full workflow: error analysis to automated judges. aakashg.com Guide · How Founders Use AI AI Evals Step-by-Step: Hamel & Shreya Masterclass Aakash Gupta
  7. Explains pass@k and why you must run agent tests many times. cameronrwolfe.substack.com Article · How Founders Use AI Agent Evaluation: A Detailed Guide Cameron Wolfe
  8. Field lessons from teams that moved agents from demo to production. infoq.com Article · How Founders Use AI Evaluating AI Agents in Practice: Benchmarks, Frameworks, and Lessons Learned InfoQ
  9. A single-sitting starter recipe for your first agent eval. zenvanriel.com Guide · How Founders Use AI AI Agent Evaluation: A Practical Step-by-Step Guide Zen van Riel
  10. Covers the metrics that matter: task success, step count, faithfulness. turingcollege.com Guide · How Founders Use AI Evaluating AI Agents: A Practical Guide Turing College
  11. Connects evals to shipping cadence rather than treating them as QA theatre. lennysnewsletter.com Article · How Founders Use AI Building eval systems that improve your AI product Lenny's Newsletter
  12. A worked example you can copy line by line for your own product. arize.com Article · How Founders Use AI AI Evals Course Homework: the Recipe Bot Workflow Arize AI
  13. Surveys the tooling landscape so you do not build eval infrastructure from scratch. medium.com Article · How Founders Use AI AI Agent Evaluation: Frameworks, Strategies, and Best Practices Dave Davies
  14. A checklist to run before you let an agent near customers. getmaxim.ai Article · How Founders Use AI 10 Essential Steps for Evaluating the Reliability of AI Agents Maxim AI
  15. The same argument in shareable form for your team channel. simonw.substack.com Article · How Founders Use AI The lethal trifecta (newsletter edition) Simon Willison
  16. The full running history of the attack class, from the person who named it. simonwillison.net Article · How Founders Use AI Prompt injection series Simon Willison
  17. Fresh real-world exploits showing this is not theoretical. simonw.substack.com Article · How Founders Use AI Prompt injections as far as the eye can see Simon Willison
  18. The industry-standard checklist, free and framework-agnostic. cheatsheetseries.owasp.org Guide · How Founders Use AI AI Agent Security Cheat Sheet OWASP
  19. Translates the OWASP list into concrete actions for small teams. goteleport.com Article · How Founders Use AI OWASP Top 10 for Agentic Applications: Key Takeaways Teleport
  20. Security researchers show working attacks and layered defenses. hiddenlayer.com Article · How Founders Use AI How the Lethal Trifecta Exposes Agentic AI HiddenLayer
  21. Frames the fix as an authorization problem, which is what it is. osohq.com Article · How Founders Use AI Understanding the Lethal Trifecta of AI Agents Oso
  22. The enterprise-buyer view, useful when their security team reviews your agent. techtarget.com Article · How Founders Use AI The agentic AI lethal trifecta: what CISOs should know TechTarget
  23. Argues you cannot prompt your way to safety; the architecture must enforce it. cyera.com Article · How Founders Use AI Why AI Agents Require Architectural Boundaries Cyera
  24. A calm engineering-management view of guardrails and human-in-the-loop. infoworld.com Article · How Founders Use AI Building AI agents the safe way InfoWorld

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The hubs

Starting Up Find an idea, validate it, build, and land your first customers. 1327 questions GTM Go-to-market, from breaking in to how the best teams do it. 379 questions D2C Building a direct-to-consumer brand, India-first. 512 questions Wealth Paying yourself, ESOPs, secondaries, and de-risking founder wealth. 165 questions How Founders Use AI How founders actually put AI to work, mapped topic by topic. 360 questions Glossary Plain-language definitions of the startup and VC terms you'll hit. 425 terms
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