Add developer message support to realtime adapters

OpenAI Realtime, Grok Realtime, and AWS Nova Sonic adapters now convert
"developer" role messages to "user" (consistent with all other non-OpenAI
adapters). Previously these messages were silently dropped. Adds starter
unit tests for all three realtime adapters.

src/pipecat/adapters/services/aws_nova_sonic_adapter.py

@@ -125,7 +125,8 @@ class AWSNovaSonicLLMAdapter(BaseLLMAdapter[AWSNovaSonicLLMInvocationParams]):
 
         universal_context_messages = copy.deepcopy(universal_context_messages)
 
-        # If we have a "system" message as our first message, let's pull that out into "instruction"
+        # If we have a "system" message as our first message,
+        # pull that out into "instruction"
         if universal_context_messages[0].get("role") == "system":
             system = universal_context_messages.pop(0)
             content = system.get("content")
@@ -136,8 +137,13 @@ class AWSNovaSonicLLMAdapter(BaseLLMAdapter[AWSNovaSonicLLMInvocationParams]):
             if system_instruction:
                 self._system_instruction = system_instruction
 
+        # Convert any remaining "system"/"developer" messages to "user",
+        # as Nova Sonic only supports "user" and "assistant" in history.
+        for msg in universal_context_messages:
+            if msg.get("role") in ("system", "developer"):
+                msg["role"] = "user"
+
         # Process remaining messages to fill out conversation history.
-        # Nova Sonic supports "user" and "assistant" messages in history.
         for universal_context_message in universal_context_messages:
             message = self._from_universal_context_message(universal_context_message)
             if message:

src/pipecat/adapters/services/grok_realtime_adapter.py

@@ -128,6 +128,11 @@ class GrokRealtimeLLMAdapter(BaseLLMAdapter):
             if not messages:
                 return self.ConvertedMessages(messages=[], system_instruction=system_instruction)
 
+        # Convert any remaining "system"/"developer" messages to "user"
+        for msg in messages:
+            if msg.get("role") in ("system", "developer"):
+                msg["role"] = "user"
+
         # Single user message can be sent normally
         if len(messages) == 1 and messages[0].get("role") == "user":
             return self.ConvertedMessages(

src/pipecat/adapters/services/open_ai_realtime_adapter.py

@@ -116,8 +116,8 @@ class OpenAIRealtimeLLMAdapter(BaseLLMAdapter):
         messages = copy.deepcopy(universal_context_messages)
         system_instruction = None
 
-        # If we have a "system" message as our first message, let's pull that out into session
-        # "instructions"
+        # If we have a "system" message as our first message,
+        # pull that out into session "instructions"
         if messages[0].get("role") == "system":
             system = messages.pop(0)
             content = system.get("content")
@@ -128,6 +128,11 @@ class OpenAIRealtimeLLMAdapter(BaseLLMAdapter):
             if not messages:
                 return self.ConvertedMessages(messages=[], system_instruction=system_instruction)
 
+        # Convert any remaining "system"/"developer" messages to "user"
+        for msg in messages:
+            if msg.get("role") in ("system", "developer"):
+                msg["role"] = "user"
+
         # If we have just a single "user" item, we can just send it normally
         if len(messages) == 1 and messages[0].get("role") == "user":
             return self.ConvertedMessages(

tests/test_get_llm_invocation_params.py

@@ -70,9 +70,12 @@ from google.genai.types import Content, Part
 from pipecat.adapters.schemas.function_schema import FunctionSchema
 from pipecat.adapters.schemas.tools_schema import ToolsSchema
 from pipecat.adapters.services.anthropic_adapter import AnthropicLLMAdapter
+from pipecat.adapters.services.aws_nova_sonic_adapter import AWSNovaSonicLLMAdapter
 from pipecat.adapters.services.bedrock_adapter import AWSBedrockLLMAdapter
 from pipecat.adapters.services.gemini_adapter import GeminiLLMAdapter
+from pipecat.adapters.services.grok_realtime_adapter import GrokRealtimeLLMAdapter
 from pipecat.adapters.services.open_ai_adapter import OpenAILLMAdapter
+from pipecat.adapters.services.open_ai_realtime_adapter import OpenAIRealtimeLLMAdapter
 from pipecat.adapters.services.open_ai_responses_adapter import OpenAIResponsesLLMAdapter
 from pipecat.adapters.services.perplexity_adapter import PerplexityLLMAdapter
 from pipecat.processors.aggregators.llm_context import (
@@ -1950,6 +1953,151 @@ class TestOpenAIResponsesGetLLMInvocationParams(unittest.TestCase):
         self.assertNotIn("instructions", params)
 
 
+class TestOpenAIRealtimeGetLLMInvocationParams(unittest.TestCase):
+    def setUp(self) -> None:
+        self.adapter = OpenAIRealtimeLLMAdapter()
+
+    def test_system_message_extracted_as_instruction(self):
+        """Initial system message is extracted as system_instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_developer_message_becomes_user(self):
+        """Developer message is converted to user, not extracted as system instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "developer", "content": "Extra context."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertIsNone(params["system_instruction"])
+        # Developer converted to user, then packed with the other user message
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_subsequent_developer_message_becomes_user(self):
+        """Non-initial developer message is converted to user."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "developer", "content": "Extra context."},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        # Developer message converted to user
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_empty_messages(self):
+        """Empty messages list returns empty."""
+        context = LLMContext(messages=[])
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["messages"], [])
+        self.assertIsNone(params["system_instruction"])
+
+
+class TestGrokRealtimeGetLLMInvocationParams(unittest.TestCase):
+    def setUp(self) -> None:
+        self.adapter = GrokRealtimeLLMAdapter()
+
+    def test_system_message_extracted_as_instruction(self):
+        """Initial system message is extracted as system_instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_developer_message_becomes_user(self):
+        """Developer message is converted to user, not extracted as system instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "developer", "content": "Extra context."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertIsNone(params["system_instruction"])
+        # Developer converted to user, then packed with the other user message
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_subsequent_developer_message_becomes_user(self):
+        """Non-initial developer message is converted to user."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "developer", "content": "Extra context."},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_empty_messages(self):
+        """Empty messages list returns empty."""
+        context = LLMContext(messages=[])
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["messages"], [])
+        self.assertIsNone(params["system_instruction"])
+
+
+class TestAWSNovaSonicGetLLMInvocationParams(unittest.TestCase):
+    def setUp(self) -> None:
+        self.adapter = AWSNovaSonicLLMAdapter()
+
+    def test_system_message_extracted_as_instruction(self):
+        """Initial system message is extracted as system_instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        self.assertEqual(len(params["messages"]), 1)
+
+    def test_developer_message_becomes_user(self):
+        """Developer message is converted to user, not extracted as system instruction."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "developer", "content": "Extra context."},
+            {"role": "user", "content": "Hello"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertIsNone(params["system_instruction"])
+        # Both messages should be present (developer as user, plus the real user)
+        self.assertEqual(len(params["messages"]), 2)
+
+    def test_subsequent_developer_message_becomes_user(self):
+        """Non-initial developer message is converted to user."""
+        messages: list[LLMStandardMessage] = [
+            {"role": "system", "content": "You are helpful."},
+            {"role": "developer", "content": "Extra context."},
+            {"role": "assistant", "content": "Hi"},
+        ]
+        context = LLMContext(messages=messages)
+        params = self.adapter.get_llm_invocation_params(context)
+
+        self.assertEqual(params["system_instruction"], "You are helpful.")
+        # Developer becomes user, plus assistant
+        self.assertEqual(len(params["messages"]), 2)
+
+
 class TestBaseLLMAdapterHelpers(unittest.TestCase):
     """Tests for the shared helper methods on BaseLLMAdapter."""