{
  "context_concept": {
    "id": "ctx_context_window_basics",
    "name": "What a context window is",
    "category": "context_window",
    "description": "The context window is the total amount of text (measured in tokens) a model can consider at once for a given request — the system prompt, conversation history, tool definitions, tool results, and any attached documents all share this one budget.",
    "how_it_works": "Every input token and every output token generated in a turn counts against the same window. Once a conversation's accumulated tokens approach the window's limit, older content must be trimmed, summarized, or dropped, or the request will fail or be truncated.",
    "source_note": "General mechanism described qualitatively; exact numeric token-limit figures per model/tier were not independently re-verified this session, so no specific number is asserted here.",
    "created_at": "2026-07-02 08:26:58",
    "cite_as": "https://subagentcontext.com/api/context-concepts/ctx_context_window_basics"
  }
}