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A short, opinionated list of MCP servers that earn their context cost — Context7, Playwright, Chrome DevTools, GitHub, Postgres and friends — with install commands and the caveats nobody mentions.
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MCP servers give your agent access, skills give it knowledge.
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Tool poisoning, rug pulls, the stdio RCE, and the lethal trifecta — what two years of MCP security incidents teach us, and how to connect servers without handing over your machine.
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Agent teams turn Claude Code sessions into coordinated teammates with a shared task list and direct messaging.
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The Superpowers plugin makes Claude Code disciplined instead of eager: brainstorm, plan, TDD, review — a structured workflow of composable skills it can't race past.
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How Claude Code subagents work: isolated context windows, custom agent files, tool scoping, delegation patterns, and when not to delegate at all.
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How the V8 engine turns JavaScript into machine code: parsing, Ignition bytecode, JIT compilation, and the modern four-tier pipeline with Sparkplug and Maglev.
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How React rendering actually works: render and commit phases, batching, pure components, children composition, context — updated for the React Compiler era.
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How JavaScript allocates and frees memory: call stack vs heap, mark-and-sweep garbage collection, generational spaces in V8, and common causes of memory leaks.