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. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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)
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. The industry-standard checklist, free and framework-agnostic. cheatsheetseries.owasp.org Guide · How Founders Use AI AI Agent Security Cheat Sheet OWASP
  17. 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
  18. Security researchers show working attacks and layered defenses. hiddenlayer.com Article · How Founders Use AI How the Lethal Trifecta Exposes Agentic AI HiddenLayer
  19. 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
  20. 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
  21. 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
  22. A copyable taint-tracking and approval-gating pattern for your own build. github.com Tool · How Founders Use AI Lethal trifecta threat model (agentic patterns repo) nibzard (awesome-agentic-patterns)
  23. 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
  24. How a major platform maps each OWASP risk to concrete mitigations. microsoft.com Article · How Founders Use AI Addressing the OWASP Top 10 Risks in Agentic AI Microsoft Security

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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