ReAct · Tools · Intent · Context
Chat = 1 pass · Agent = plan + act + observe loop
Thought → Action → Observation → repeat
search_flights → book_flight → confirm PNR
JSON schema · one job per tool · RAG as tool
QA → RAG · transaction → agent · confidence fallback
rules > state > RAG > history > summary
2 tools + router + 10 test cases
Tool accuracy · task success · SWE-bench
Scroll: #agent-practice · #agent-eval
Next: Retrieval Engineering