Lesson 5: State = Dict — AgentCraft

Track structured data alongside LLM conversations with a plain Python dict. Build what LangGraph state channels do — no framework required.

State = Dict You know how Claude shows "Searched 5 files" or ChatGPT shows "Analyzed data" with a little summary? That's not from the messages — it's state tracked alongside the conversation. The messages array is the raw tape. But you often need structured answers: *which tools ran? how many turns? what were the results?* That's state — a dict updated inside the loop, returned alongside the answer. > Framework parallel: LangGraph calls these "state channels" with typed reducers. Strip the abstraction: it's a dict updated in a loop.

Concepts covered

state
structured tracking
metadata
observability

Framework comparison: LangGraph state channels, Redux store — structured data alongside the conversation.