diff --git a/phi/document/chunking/agentic.py b/phi/document/chunking/agentic.py
index 7c50e6415..f8b3e1c17 100644
--- a/phi/document/chunking/agentic.py
+++ b/phi/document/chunking/agentic.py
@@ -9,7 +9,7 @@
 
 class AgenticChunking(ChunkingStrategy):
     """Chunking strategy that uses an LLM to determine natural breakpoints in the text"""
-    
+
     def __init__(self, model: Optional[Model] = None, max_chunk_size: int = 5000):
         self.model = model or OpenAIChat()
         self.max_chunk_size = max_chunk_size
diff --git a/phi/document/chunking/base.py b/phi/document/chunking/base.py
index 61c22cd2e..e4e24a325 100644
--- a/phi/document/chunking/base.py
+++ b/phi/document/chunking/base.py
@@ -10,7 +10,7 @@ class ChunkingStrategy(ABC):
     @abstractmethod
     def chunk(self, document: Document) -> List[Document]:
         raise NotImplementedError
-    
+
     def clean_text(self, text: str) -> str:
         """Clean the text by replacing multiple newlines with a single newline"""
         import re
diff --git a/phi/document/chunking/fixed.py b/phi/document/chunking/fixed.py
index d9f19df51..c1fbf81d8 100644
--- a/phi/document/chunking/fixed.py
+++ b/phi/document/chunking/fixed.py
@@ -6,7 +6,7 @@
 
 class FixedChunking(ChunkingStrategy):
     """Chunking strategy that splits text into fixed-size chunks with optional overlap"""
-    
+
     def __init__(self, chunk_size: int = 5000, overlap: int = 0):
         self.chunk_size = chunk_size
         self.overlap = overlap
diff --git a/phi/document/reader/base.py b/phi/document/reader/base.py
index 765eb2abe..044e99a81 100644
--- a/phi/document/reader/base.py
+++ b/phi/document/reader/base.py
@@ -19,4 +19,4 @@ def read(self, obj: Any) -> List[Document]:
         raise NotImplementedError
 
     def chunk_document(self, document: Document) -> List[Document]:
-        return self.chunking_strategy.chunk(document)
\ No newline at end of file
+        return self.chunking_strategy.chunk(document)
diff --git a/phi/knowledge/agent.py b/phi/knowledge/agent.py
index 028e89aef..33cf73304 100644
--- a/phi/knowledge/agent.py
+++ b/phi/knowledge/agent.py
@@ -5,7 +5,6 @@
 from phi.document import Document
 from phi.document.reader.base import Reader
 from phi.knowledge.base import AssistantKnowledge
-from phi.knowledge.chunks import CharacterChunks, ChunkingStrategy
 from phi.vectordb import VectorDb
 from phi.utils.log import logger