diff --git a/examples/contextual_memory.py b/examples/contextual_memory.py
index 5797213..2e4e542 100644
--- a/examples/contextual_memory.py
+++ b/examples/contextual_memory.py
@@ -8,7 +8,7 @@ import os
 import pickle
 
 
-class ContextualMemoryPlugin:
+class ContextualMemoryPlugin(sm.BasePlugin):
     def __init__(
         self,
         api_key: str,
diff --git a/examples/generate_data.py b/examples/generate_data.py
index 888d694..a682644 100644
--- a/examples/generate_data.py
+++ b/examples/generate_data.py
@@ -25,7 +25,7 @@ class QuotesList(BaseModel):
     quotes: List[MovieQuote]
 
 
-def gen_quotes(n=10) -> Iterator[MovieQuote]:
+def gen_quotes(n: int = 10) -> Iterator[MovieQuote]:
     """Generate a list of quotes from famous movies."""
 
     for q in sm.generate_data(
diff --git a/examples/math_plugin.py b/examples/math_plugin.py
index 8637073..436d04f 100644
--- a/examples/math_plugin.py
+++ b/examples/math_plugin.py
@@ -1,9 +1,11 @@
 from _context import sm
 
 
-class MathPlugin:
+class MathPlugin(sm.BasePlugin):
     def send_hook(self, conversation: sm.Conversation):
         last_user_message = conversation.get_last_message(role="user")
+        if last_user_message is None:
+            return
         if "calculate" in last_user_message.text.lower():
             expression = last_user_message.text.lower().replace("calculate", "").strip()
             try:
@@ -14,7 +16,7 @@ class MathPlugin:
             except Exception:
                 conversation.add_message(
                     role="assistant",
-                    text="I'm sorry, I couldn't compute that expression.",
+                    text="I'm sorry, I couldn't compute that expression. Please try again.",
                 )
 
 
diff --git a/examples/two_llms_talking.py b/examples/two_llms_talking.py
index 4971867..d098599 100644
--- a/examples/two_llms_talking.py
+++ b/examples/two_llms_talking.py
@@ -8,7 +8,7 @@ class ConversationPlugin(sm.BasePlugin):
         print(f"{conversation.llm_model}:\n{response.text.strip()}\n\n------------\n")
 
 
-def have_conversation(rounds=3):
+def have_conversation(rounds: int = 3):
     # Create two conversations - one for each AI
     with (
         sm.create_conversation(
diff --git a/simplemind/providers/anthropic.py b/simplemind/providers/anthropic.py
index 77e4d20..bfb31c6 100644
--- a/simplemind/providers/anthropic.py
+++ b/simplemind/providers/anthropic.py
@@ -57,7 +57,7 @@ class Anthropic(BaseProvider):
 
     def structured_response(self, model: str, response_model, **kwargs):
         response = self.structured_client.messages.create(
-            model=model, response_model=response_model or self.DEFAULT_MODEL, **kwargs
+            model=model or self.DEFAULT_MODEL, response_model=response_model, **kwargs
         )
         return response
 
diff --git a/simplemind/providers/gemini.py b/simplemind/providers/gemini.py
index f3bdb26..5bdd25d 100644
--- a/simplemind/providers/gemini.py
+++ b/simplemind/providers/gemini.py
@@ -23,7 +23,7 @@ class Gemini(BaseProvider):
         if not self.api_key:
             raise ValueError("Gemini API key is required")
         self.model_name = model_name
-        return genai.GenerativeModel(model_name=model_name)
+        return genai.GenerativeModel(model_name=self.model_name)
 
     @property
     def structured_client(self):
@@ -42,9 +42,13 @@ class Gemini(BaseProvider):
             for msg in conversation.messages
         ]
 
-        response = self.structured_client.chat.completions.create(
-            messages=messages, response_model=None
-        )
+        try:
+            response = self.structured_client.chat.completions.create(
+                messages=messages, response_model=None
+            )
+        except Exception as e:
+            # Handle the exception appropriately, e.g., log the error or raise a custom exception
+            raise RuntimeError(f"Failed to send conversation to Gemini API: {e}") from e
 
         # Create and return a properly formatted Message instance
         return Message(
@@ -57,15 +61,25 @@ class Gemini(BaseProvider):
 
     def structured_response(self, prompt: str, response_model, **kwargs):
         """Send a structured response to the Gemini API."""
-        response = self.structured_client.chat.completions.create(
-            messages=[{"role": "user", "content": prompt}],
-            response_model=response_model,
-        )
+        try:
+            response = self.structured_client.chat.completions.create(
+                messages=[{"role": "user", "content": prompt}],
+                response_model=response_model,
+            )
+        except Exception as e:
+            # Handle the exception appropriately, e.g., log the error or raise a custom exception
+            raise RuntimeError(
+                f"Failed to send structured response to Gemini API: {e}"
+            ) from e
         return response
 
     def generate_text(self, prompt: str, **kwargs) -> str:
         """Generate text using the Gemini API."""
-        response = self.structured_client.chat.completions.create(
-            messages=[{"role": "user", "content": prompt}], response_model=None
-        )
+        try:
+            response = self.structured_client.chat.completions.create(
+                messages=[{"role": "user", "content": prompt}], response_model=None
+            )
+        except Exception as e:
+            # Handle the exception appropriately, e.g., log the error or raise a custom exception
+            raise RuntimeError(f"Failed to generate text with Gemini API: {e}") from e
         return str(response)
diff --git a/simplemind/providers/ollama.py b/simplemind/providers/ollama.py
index 24a1ea7..d10a036 100644
--- a/simplemind/providers/ollama.py
+++ b/simplemind/providers/ollama.py
@@ -26,7 +26,7 @@ class Ollama(BaseProvider):
         return ol.Client(timeout=self.TIMEOUT, host=self.host_url)
 
     @property
-    def structured_client(self):
+    def structured_client(self) -> instructor.Instructor:
         """A client patched with Instructor."""
         return instructor.from_openai(
             OpenAI(
@@ -36,7 +36,7 @@ class Ollama(BaseProvider):
             mode=instructor.Mode.JSON,
         )
 
-    def send_conversation(self, conversation: "Conversation"):
+    def send_conversation(self, conversation: "Conversation") -> "Message":
         """Send a conversation to the Ollama API."""
         from ..models import Message
 
@@ -81,4 +81,4 @@ class Ollama(BaseProvider):
             messages=messages, model=llm_model or self.DEFAULT_MODEL
         )
 
-        return response.get("message").get("content")
+        return response.get("message", {}).get("content", "")
diff --git a/simplemind/providers/openai.py b/simplemind/providers/openai.py
index 2a296cc..549f28a 100644
--- a/simplemind/providers/openai.py
+++ b/simplemind/providers/openai.py
@@ -52,7 +52,7 @@ class OpenAI(BaseProvider):
         )
 
     def structured_response(
-        self, prompt: str, response_model, *, llm_model: str, **kwargs
+        self, prompt: str, response_model, *, llm_model: str | None = None, **kwargs
     ):
         # Ensure messages are provided in kwargs
         messages = [
@@ -67,7 +67,7 @@ class OpenAI(BaseProvider):
         )
         return response
 
-    def generate_text(self, prompt: str, *, llm_model: str, **kwargs):
+    def generate_text(self, prompt: str, *, llm_model: str | None = None, **kwargs):
         messages = [
             {"role": "user", "content": prompt},
         ]
diff --git a/test.py b/test.py
new file mode 100644
index 0000000..0b710d6
--- /dev/null
+++ b/test.py
@@ -0,0 +1,9 @@
+import simplemind as sm
+
+res = sm.generate_text(
+    prompt="Wish you a happy Diwali!",
+    llm_model="gpt-4o",
+    llm_provider="openai",
+)
+
+print(res)