This is how many tokens the model sees at once: the whole conversation, attached files, hidden instructions and its own reply.

In depth: 00 · ABC: six words before you start → “2. Context window”

Related: token · context · prompt

Appears in

• 04 · Prompt Engineering: The sins of prompting
• 05 · Context & Memory: When the agent didn't get you
• 07 · Tools & Extensions: MCP: superpowers through a protocol

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