this is f*cking unreal, one site taught me agents better than any $2000 course Agent Chip 101 is a whole circuit board where a Claude Code agent is taken apart into pieces and you click every one of them yourself the socket in the middle holds the core: Opus 5.5, Sonnet 5.5, Haiku 5.5, you swap the chip right in the socket and watch the price and the behaviour change on the side sits the context battery at 58% free, every read and every tool call drains it, and when it dies you pay twice for the same task then 10 lessons laid out one by one: CLAUDE.md, memory, tools, the MCP port, skill cartridges, hook relays, subagent cores, all switching on and off in front of you the funny part is how many people have half of these switches set wrong, so the bill grows while the agent does the exact same thing save it so you don't lose it, link below ↓