feat: trigger prompt reply after opening confirmation

backend/services/brains/prompt_brain.py

@@ -10,7 +10,11 @@ from uuid import uuid4
 from loguru import logger
 from models import AssistantConfig
 from pipecat.adapters.schemas.function_schema import FunctionSchema
-from pipecat.frames.frames import OutputTransportMessageUrgentFrame, TTSSpeakFrame
+from pipecat.frames.frames import (
+    LLMRunFrame,
+    OutputTransportMessageUrgentFrame,
+    TTSSpeakFrame,
+)
 from pipecat.processors.aggregators.llm_context import LLMContext
 from pipecat.processors.frame_processor import FrameProcessor
 from pipecat.services.llm_service import (
@@ -165,6 +169,7 @@ class PromptBrain(BaseBrain):
             raise RuntimeError("PromptBrain 尚未初始化")
         opening_message = self._opening_message()
         opening_actions = self._startup_actions("opening")
+        generate_after_confirmation = opening_message is not None
         speech = (
             self._render_greeting(self._cfg).strip()
             if opening_message is not None
@@ -179,7 +184,8 @@ class PromptBrain(BaseBrain):
                     speak=self._speak_opening,
                     set_input_enabled=runtime.set_input_enabled,
                     input_already_blocked=self._opening_input_blocked,
-                    release_input_on_success=not bool(opening_actions),
+                    # Keep the gate until the automatic first reply is queued.
+                    release_input_on_success=False,
                     release_input_on_failure=False,
                 )
                 if not message_result.succeeded:
@@ -191,7 +197,13 @@ class PromptBrain(BaseBrain):
             if opening_actions:
                 result = await self._action_stages.run(
                     self._opening_actions_stage_spec(),
-                    set_input_enabled=runtime.set_input_enabled,
+                    # The Prompt opening lifecycle owns the input gate when a
+                    # confirmation message will trigger an automatic reply.
+                    set_input_enabled=(
+                        None
+                        if generate_after_confirmation
+                        else runtime.set_input_enabled
+                    ),
                     input_already_blocked=self._opening_input_blocked,
                     release_input_on_failure=False,
                     on_outcome=self._publish_opening_outcome,
@@ -204,6 +216,11 @@ class PromptBrain(BaseBrain):
             raise
         self._opening_finished = True
         self._opening_input_blocked = False
+        if generate_after_confirmation and not runtime.call_end.ending:
+            logger.debug("Prompt 开场确认完成，触发自动首句")
+            await runtime.queue_frame(LLMRunFrame())
+            if runtime.set_input_enabled is not None:
+                runtime.set_input_enabled(True)
 
     async def _speak_opening(self, content: str) -> Awaitable[None] | None:
         if self._output is None: