MCP looks like a platform until you watch the bytes move. Here's the same tool call over stdio and Streamable HTTP — same JSON-RPC, different wire.

LLMs don't execute code. They generate text. So when an agent "checks the weather" or "calls an API", something else is doing the work. Here's the loop behind every agent framework — built from scratch, with an interactive walkthrough.

Before subnetting makes any sense, you need to actually understand what an IP address is. Here's the foundation — binary, octets, private ranges, and subnet masks — explained the way I finally got it.