diff --git a/docs/swarms/tools/main.md b/docs/swarms/tools/main.md
index 9c749412d..669d38ed9 100644
--- a/docs/swarms/tools/main.md
+++ b/docs/swarms/tools/main.md
@@ -76,6 +76,38 @@ def summarize_expenses(data: SummarizeExpenses) -> dict:
     return {"total_expenses": total_expenses}
 ```
 
+#### Using Default BaseModel
+
+When initializing an Agent with tools but without specifying `list_base_models`, the system automatically uses a DefaultBaseModel:
+
+```python
+from pydantic import BaseModel, Field
+from typing import Any
+
+class DefaultBaseModel(BaseModel):
+    """A default base model that accepts any data structure"""
+    data: Any = Field(default=None, description="Any data type")
+    
+    class Config:
+        arbitrary_types_allowed = True
+        extra = "allow"
+
+# Agent will use DefaultBaseModel automatically if no list_base_models provided
+agent = Agent(
+    agent_name="Simple Agent",
+    tools=[your_tool_function],  # DefaultBaseModel will be used
+    llm=your_llm_instance
+)
+```
+
+⚠️ **Warning**: While the DefaultBaseModel provides flexibility, it's recommended to define your own specific Pydantic models for:
+- Type safety and validation
+- Clear documentation
+- Predictable behavior
+- Schema generation
+
+For production use, define custom models like the examples above (CalculateTax, GenerateInvoice).
+
 #### Using Functions Directly
 
 Tools can also be defined directly as functions without using Pydantic models. This approach is suitable for simpler tasks where complex validation is not required.
diff --git a/swarms/structs/agent.py b/swarms/structs/agent.py
index a59e0d4e4..04c6be70a 100644
--- a/swarms/structs/agent.py
+++ b/swarms/structs/agent.py
@@ -26,7 +26,7 @@
     execute_on_gpu,
     execute_with_cpu_cores,
 )
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from swarm_models.tiktoken_wrapper import TikTokenizer
 from termcolor import colored
 
@@ -90,6 +90,14 @@ def exists(val):
 
 
 # [FEAT][AGENT]
+class DefaultBaseModel(BaseModel):
+    """A default base model that accepts any data structure"""
+    data: Any = Field(default=None, description="Any data type")
+    
+    class Config:
+        arbitrary_types_allowed = True
+        extra = "allow"
+
 class Agent:
     """
     Agent is the backbone to connect LLMs with tools and long term memory. Agent also provides the ability to
@@ -477,6 +485,24 @@ def __init__(
             or exists(tool_schema)
         ):
 
+            # If no base models provided, use the default one
+            if exists(tools) or exists(tool_schema):
+                if list_base_models is None:
+                    list_base_models = [DefaultBaseModel]
+                    logger.warning(
+                        colored(
+                            "\nUsing default base model for tool schema validation. "
+                            "This can lead to potential format mismatches or validation issues. "
+                            "Consider defining your own Pydantic BaseModel(s) with proper field definitions "
+                            "and validation rules for your specific use case.\n"
+                            "Example:\n"
+                            "class YourModel(BaseModel):\n"
+                            "    field1: str = Field(..., description='Description of field1')\n"
+                            "    field2: int = Field(..., description='Description of field2')\n",
+                            "yellow"
+                        )
+                    )
+
             self.tool_struct = BaseTool(
                 tools=tools,
                 base_models=list_base_models,