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Fix prompt caching middleware missing wrap/unwrap round-trip (#3666)

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Bill Easton 2026-03-27 20:42:09 -05:00 • committed by GitHub
commit 2491993327
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1 changed files with 3 additions and 2 deletions
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src/fastmcp/server/middleware/caching.py
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@ -480,14 +480,15 @@ class ResponseCachingMiddleware(Middleware):
return cached_value.unwrap()
value: PromptResult = await call_next(context=context)
cached_value = CachablePromptResult.wrap(value)
await self._get_prompt_cache.put(
key=cache_key,
value=CachablePromptResult.wrap(value),
value=cached_value,
ttl=self._get_prompt_settings.get("ttl", ONE_HOUR_IN_SECONDS),
)
return value
return cached_value.unwrap()
def _matches_tool_cache_settings(self, tool_name: str) -> bool:
"""Check if the tool matches the cache settings for tool calls."""