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docs: clarify cache-ttl pruning window

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Peter Steinberger
2026-01-21 19:58:28 +00:00
parent c145a0d116
commit 6866cca6d7
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docs/gateway/configuration.md
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@@ -1597,6 +1597,7 @@ Notes / current limitations:
- The estimated “context ratio” is based on **characters** (approximate), not exact tokens.
- If the session doesn’t contain at least `keepLastAssistants` assistant messages yet, pruning is skipped.
- `cache-ttl` only activates for Anthropic API calls (and OpenRouter Anthropic models).
- After a prune, the TTL window resets so subsequent requests keep cache until `ttl` expires again.
- For best results, match `contextPruning.ttl` to the model `cacheControlTtl` you set in `agents.defaults.models.*.params`.
Default (off):