services(anthropic): allow setting enable prompt caching via frame

src/pipecat/frames/frames.py

@@ -186,6 +186,13 @@ class LLMSetToolsFrame(DataFrame):
     tools: List[dict]
 
 
+@dataclass
+class LLMEnablePromptCachingFrame(DataFrame):
+    """A frame to enable/disable prompt caching in certain LLMs.
+    """
+    enable: bool
+
+
 @dataclass
 class TTSSpeakFrame(DataFrame):
     """A frame that contains a text that should be spoken by the TTS in the

src/pipecat/services/anthropic.py

@@ -16,6 +16,7 @@ import re
 
 from pipecat.frames.frames import (
     Frame,
+    LLMEnablePromptCachingFrame,
     LLMModelUpdateFrame,
     TextFrame,
     VisionImageRawFrame,
@@ -62,10 +63,10 @@ class AnthropicContextAggregatorPair:
     _user: 'AnthropicUserContextAggregator'
     _assistant: 'AnthropicAssistantContextAggregator'
 
-    def user(self) -> str:
+    def user(self) -> 'AnthropicUserContextAggregator':
         return self._user
 
-    def assistant(self) -> str:
+    def assistant(self) -> 'AnthropicAssistantContextAggregator':
         return self._assistant
 
 
@@ -227,6 +228,9 @@ class AnthropicLLMService(LLMService):
         elif isinstance(frame, LLMModelUpdateFrame):
             logger.debug(f"Switching LLM model to: [{frame.model}]")
             self._model = frame.model
+        elif isinstance(frame, LLMEnablePromptCachingFrame):
+            logger.debug(f"Setting enable prompt caching to: [{frame.enable}]")
+            self._enable_prompt_caching_beta = frame.enable
         else:
             await self.push_frame(frame, direction)
 

src/pipecat/services/openai.py

@@ -229,10 +229,10 @@ class OpenAIContextAggregatorPair:
     _user: 'OpenAIUserContextAggregator'
     _assistant: 'OpenAIAssistantContextAggregator'
 
-    def user(self) -> str:
+    def user(self) -> 'OpenAIUserContextAggregator':
         return self._user
 
-    def assistant(self) -> str:
+    def assistant(self) -> 'OpenAIAssistantContextAggregator':
         return self._assistant
 
 

src/pipecat/services/together.py

@@ -49,10 +49,10 @@ class TogetherContextAggregatorPair:
     _user: 'TogetherUserContextAggregator'
     _assistant: 'TogetherAssistantContextAggregator'
 
-    def user(self) -> str:
+    def user(self) -> 'TogetherUserContextAggregator':
         return self._user
 
-    def assistant(self) -> str:
+    def assistant(self) -> 'TogetherAssistantContextAggregator':
         return self._assistant