Fix tool calling when using openai with groq (#1245)

CHANGELOG.md

@@ -97,6 +97,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `PromptTask` will merge in its Structure's Rulesets and Rules.
 - `PromptTask` not checking whether Structure was set before building Prompt Stack.
 - `BaseTask.full_context` context being empty when not connected to a Structure.
+- Tool calling when using `OpenAiChatPromptDriver` with Groq.
 
 ## \[0.32.0\] - 2024-09-17
 

griptape/drivers/prompt/openai_chat_prompt_driver.py

@@ -200,6 +200,9 @@ def __to_openai_messages(self, messages: list[Message]) -> list[dict]:
                         ]
                     ],
                 }
+                # Some OpenAi-compatible services don't accept an empty array for content
+                if not openai_message["content"]:
+                    openai_message["content"] = ""
 
                 # Action calls must be attached to the message, not sent as content.
                 action_call_content = [

tests/unit/drivers/prompt/test_openai_chat_prompt_driver.py

@@ -251,7 +251,6 @@ def prompt_stack(self):
         prompt_stack.add_assistant_message(
             ListArtifact(
                 [
-                    TextArtifact("thought"),
                     ActionArtifact(ToolAction(tag="MockTool_test", name="MockTool", path="test", input={"foo": "bar"})),
                 ]
             )
@@ -288,7 +287,7 @@ def messages(self):
             },
             {"role": "assistant", "content": "assistant-input"},
             {
-                "content": [{"text": "thought", "type": "text"}],
+                "content": "",
                 "role": "assistant",
                 "tool_calls": [
                     {