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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 clearest official explanation of what an agent eval actually is. anthropic.com Guide · How Founders Use AI Demystifying evals for AI agents Anthropic
  2. 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
  3. Video · How Founders Use AI Why AI evals are the hottest new skill for product builders Lenny's Podcast (Hamel Husain & Shreya Shankar)
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. A second full session using messy real data instead of toy examples. news.aakashg.com Podcast · How Founders Use AI How to Do AI Evals Step-by-Step with Real Production Data Product Growth (Hamel & Shreya)
  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. The foundational explainer that makes the attack click in 15 minutes. simonw.substack.com Video · How Founders Use AI Prompt injection explained, with video, slides, and a transcript Simon Willison
  18. 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
  19. The industry-standard checklist, free and framework-agnostic. cheatsheetseries.owasp.org Guide · How Founders Use AI AI Agent Security Cheat Sheet OWASP
  20. 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
  21. Security researchers show working attacks and layered defenses. hiddenlayer.com Article · How Founders Use AI How the Lethal Trifecta Exposes Agentic AI HiddenLayer
  22. 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
  23. 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
  24. 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

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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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