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docs: add warning about summary model context length requirement (#7879)

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The summary model used for context compaction must have a context window
at least as large as the main agent model. If it's smaller, the
summarization API call fails and middle turns are dropped without a
summary, silently losing conversation context.

Promoted the existing note in configuration.md to a visible warning
admonition, and added a matching warning in the developer guide's
context compression page.
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Teknium 2026-04-11 11:13:48 -07:00 • committed by GitHub
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website/docs/user-guide/configuration.md
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@ -480,7 +480,9 @@ Points at a custom OpenAI-compatible endpoint. Uses `OPENAI_API_KEY` for auth.
| `nous` / `openrouter` / etc. | not set | Force that provider, use its auth |
| any | set | Use the custom endpoint directly (provider ignored) |
The `summary_model` must support a context length at least as large as your main model's, since it receives the full middle section of the conversation for compression.
:::warning Summary model context length requirement
The `summary_model` **must** have a context window at least as large as your main agent model's. The compressor sends the full middle section of the conversation to the summary model — if that model's context window is smaller than the main model's, the summarization call will fail with a context length error. When this happens, the middle turns are **dropped without a summary**, losing conversation context silently. If you override `summary_model`, verify its context length meets or exceeds your main model's.
:::
## Context Engine