diff --git a/codechunk/core/summarizer.py b/codechunk/core/summarizer.py
new file mode 100644
index 0000000..7705b00
--- /dev/null
+++ b/codechunk/core/summarizer.py
@@ -0,0 +1,153 @@
+from typing import Optional, List
+from codechunk.core.chunking import ParsedChunk
+
+
+class CodeSummarizer:
+    """Summarize code chunks for LLM context."""
+
+    def __init__(self):
+        self.summary_templates = {
+            "function": "Function {name} with {param_count} parameters",
+            "class": "Class {name} with {method_count} methods",
+            "method": "Method {name} of class {class_name}",
+            "file": "File {filename} in {language}",
+        }
+
+    def summarize(self, chunk: ParsedChunk) -> str:
+        """Generate a summary for a chunk."""
+        if chunk.summary:
+            return chunk.summary
+
+        if chunk.chunk_type == "function":
+            summary = self._summarize_function(chunk)
+        elif chunk.chunk_type == "method":
+            summary = self._summarize_method(chunk)
+        elif chunk.chunk_type == "class":
+            summary = self._summarize_class(chunk)
+        elif chunk.chunk_type == "file":
+            summary = self._summarize_file(chunk)
+        else:
+            summary = self._summarize_generic(chunk)
+
+        return summary
+
+    def _summarize_function(self, chunk: ParsedChunk) -> str:
+        """Summarize a function."""
+        parts = []
+
+        if chunk.metadata.decorators:
+            decorators = ", ".join(d[1:] if d.startswith("@") else d for d in chunk.metadata.decorators)
+            parts.append(f"Decorators: {decorators}")
+
+        parts.append(f"Function: {chunk.name}")
+
+        if chunk.metadata.parameters:
+            parts.append(f"Parameters: {', '.join(chunk.metadata.parameters)}")
+
+        if chunk.metadata.return_type:
+            parts.append(f"Returns: {chunk.metadata.return_type}")
+
+        if chunk.metadata.docstring:
+            doc_summary = chunk.metadata.docstring[:100]
+            if len(chunk.metadata.docstring) > 100:
+                doc_summary += "..."
+            parts.append(f"Doc: {doc_summary}")
+
+        parts.append(f"Lines: {chunk.metadata.line_count}")
+
+        if chunk.metadata.complexity_score > 5:
+            parts.append(f"Complexity: {chunk.metadata.complexity_score}")
+
+        return " | ".join(parts)
+
+    def _summarize_method(self, chunk: ParsedChunk) -> str:
+        """Summarize a method."""
+        class_name = chunk.name.split(".")[0] if "." in chunk.name else "Unknown"
+
+        parts = []
+        parts.append(f"Method: {chunk.name}")
+
+        if chunk.metadata.parameters:
+            params = [p for p in chunk.metadata.parameters if p != "self" and p != "cls"]
+            if params:
+                parts.append(f"Parameters: {', '.join(params)}")
+
+        if chunk.metadata.return_type:
+            parts.append(f"Returns: {chunk.metadata.return_type}")
+
+        if chunk.metadata.docstring:
+            doc_summary = chunk.metadata.docstring[:100]
+            if len(chunk.metadata.docstring) > 100:
+                doc_summary += "..."
+            parts.append(f"Doc: {doc_summary}")
+
+        return " | ".join(parts)
+
+    def _summarize_class(self, chunk: ParsedChunk) -> str:
+        """Summarize a class."""
+        parts = []
+        parts.append(f"Class: {chunk.name}")
+
+        if chunk.metadata.docstring:
+            doc_summary = chunk.metadata.docstring[:150]
+            if len(chunk.metadata.docstring) > 150:
+                doc_summary += "..."
+            parts.append(f"Doc: {doc_summary}")
+
+        parts.append(f"Lines: {chunk.metadata.line_count}")
+
+        return " | ".join(parts)
+
+    def _summarize_file(self, chunk: ParsedChunk) -> str:
+        """Summarize a file."""
+        parts = []
+        parts.append(f"File: {chunk.metadata.file_name}")
+        parts.append(f"Language: {chunk.metadata.language}")
+        parts.append(f"Lines: {chunk.metadata.line_count}")
+
+        if chunk.metadata.imports:
+            import_count = len(chunk.metadata.imports)
+            parts.append(f"Imports: {import_count}")
+
+        return " | ".join(parts)
+
+    def _summarize_generic(self, chunk: ParsedChunk) -> str:
+        """Summarize a generic chunk."""
+        return f"{chunk.chunk_type.capitalize()}: {chunk.name} ({chunk.metadata.line_count} lines)"
+
+    def batch_summarize(self, chunks: List[ParsedChunk]) -> List[str]:
+        """Generate summaries for multiple chunks."""
+        return [self.summarize(chunk) for chunk in chunks]
+
+    def generate_overview(self, chunks: List[ParsedChunk], project_name: str = "Project") -> str:
+        """Generate an overview of the project structure."""
+        lines = []
+        lines.append(f"# {project_name} Overview")
+        lines.append("")
+
+        type_counts = {}
+        lang_counts = {}
+
+        for chunk in chunks:
+            type_counts[chunk.chunk_type] = type_counts.get(chunk.chunk_type, 0) + 1
+            lang_counts[chunk.metadata.language] = lang_counts.get(chunk.metadata.language, 0) + 1
+
+        lines.append("## Statistics")
+        lines.append(f"- Total chunks: {len(chunks)}")
+        for chunk_type, count in sorted(type_counts.items()):
+            lines.append(f"  - {chunk_type}: {count}")
+        lines.append("")
+
+        lines.append("## Languages")
+        for lang, count in sorted(lang_counts.items(), key=lambda x: -x[1]):
+            lines.append(f"- {lang}: {count}")
+        lines.append("")
+
+        high_priority = [c for c in chunks if c.priority >= 75]
+        if high_priority:
+            lines.append("## Key Components (High Priority)")
+            for chunk in high_priority[:10]:
+                summary = self.summarize(chunk)
+                lines.append(f"- **{chunk.name}**: {summary}")
+
+        return "\n".join(lines)