A model reads text not letter by letter or word by word, but in pieces called tokens.

In depth: 00 · ABC: six words before you start → “1. Token”

Related: context window · model · prompt

Appears in

• 02 · Setup: Installing the tools
• 03 · Stack selection: Behind a censorship firewall: no VPN
• 05 · Context & Memory: The memory system
• 07 · Tools & Extensions: MCP: superpowers through a protocol · Pendel: your agent audits your project
• 08 · Agent Engineering: Prototype → Production · Agent SDK: the Agent as a Library
• 10 · Model Training: What's inside a model · Fine-tuning: when and how
• 11 · Second Brain: A second brain that stays with you · A channel: your agent within reach · Security: everything that comes from outside · Practice: build your own second brain

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checked against the course: 2026-11-02 · 664b147