3percentclub · Builders
Teacher accessCatch up on any class
Free, hands-on AI classes for people who build. Every class opens with a recap, so you can jump in anytime. Read the summary, flip through the slides, and try the homework.
Join in person in NYC or on Zoom.
Classes
- Week 6Tue, Oct 20, 2026 · Evals, guardrails, and hackathon prepTest your AI before you trust itWe ran the same 20 civic prompts through three models, three times each, to see which differences were real and which were noise. Then we added guardrails and set what "done" means for Demo Day.SlidesHomework
- Week 5Thu, Oct 15, 2026 · Data boundaries, prompt injection, and securityLock the doors on your AI appWe treated our agent like a haunted house: found every way a ghost sneaks in, from hidden instructions in documents to leaked keys and over-powered tools, then locked the doors in code instead of in a prompt.SlidesHomework
- Week 4Thu, Oct 8, 2026 · Retrieval (RAG), hybrid search, and memoryMake your AI answer from your own dataWe built a search engine over a horror movie shelf so an AI clerk could answer from real data instead of guessing. We compared chunk sizes, combined meaning-based and keyword search, re-ranked the results, and fixed the follow-up questions that break search.SlidesHomework
- Week 3Thu, Oct 1, 2026 · Tool calling, MCP servers, and SkillsGive your AI tools it can actually useWe built the loop that lets a model use real tools, from scratch, on live NYC Open Data. Then we wrapped those same tools as an MCP server so any AI app can use them, and wrote a Skill: a plain-English playbook for the whole job.SlidesHomework
- Week 2Thu, Sep 24, 2026 · Open models, model selection, and API basicsPick the right AI model for the jobStop collecting models and start building a decision process. We scored real tasks on three questions, treated every model as a plain web endpoint, and fixed a router that missed a deadline buried in a community board notice.SlidesHomework
- Week 1Thu, Sep 17, 2026 · Claude Code settings, hooks, sessions, and SkillsGet more out of your AI coding assistantA tour of the hidden manual for Claude Code: the settings, hooks, and commands most people never find in the docs. We made the assistant tell us when it's done, kept multiple sessions straight, saved a repeatable prompt as a Skill, and talked through when a bigger model is worth the cost.SlidesTry it yourself
Want the full fellowship?
Classes are open to everyone. Fellows also get homework feedback in Google Classroom, a cohort Discord role, office hours, and priority seats at the hackathon.