Projects.
Build one real thing, a tested step at a time. Your code from each step runs in the next.
- 01An agent from scratch, step by stepThe same agent as An agent from scratch, as 28 small functions in six parts, each a few lines with its own tests, composing into one system.easy28 steps~3hStart
- 02Build a harnessA solid coding agent in twelve small functions: five tools, the guards, a conversation, the loop. Each step lands in your harness as you pass it.easy12 steps~1hStart
- 03Build a model clientThe wrapper every team writes around a model API, as 27 small functions: hold a conversation, finish a cut-off reply, get JSON that validates, read a stream, retry a busy API and count what it cost.easy27 steps~2hStart
- 04Multi-harness RLThe capture proxy, the rollout graph, the rewards and the GRPO batch that train a model inside real agent harnesses, in 28 small functions. The ending runs the site's model through your proxy.hard28 steps~4hStart