diff --git a/.code_doc_cli/utils/config.py b/.code_doc_cli/utils/config.py
new file mode 100644
index 0000000..cc1cc30
--- /dev/null
+++ b/.code_doc_cli/utils/config.py
@@ -0,0 +1,107 @@
+"""Configuration handling."""
+
+import os
+from dataclasses import dataclass, field
+from typing import Optional
+import toml
+
+
+@dataclass
+class Config:
+    """Configuration for code-doc-cli."""
+
+    input_patterns: list[str] = field(default_factory=lambda: ["**/*.py", "**/*.ts", "**/*.go"])
+    output_file: Optional[str] = None
+    language: Optional[str] = None
+    template_style: str = "default"
+    syntax_highlighting: bool = True
+    theme: str = "default"
+    fail_on_warning: bool = False
+    exclude_patterns: list[str] = field(default_factory=list)
+    include_private: bool = False
+    output_format: str = "markdown"
+
+    def to_dict(self) -> dict:
+        """Convert config to dictionary."""
+        return {
+            "input_patterns": self.input_patterns,
+            "output_file": self.output_file,
+            "language": self.language,
+            "template_style": self.template_style,
+            "syntax_highlighting": self.syntax_highlighting,
+            "theme": self.theme,
+            "fail_on_warning": self.fail_on_warning,
+            "exclude_patterns": self.exclude_patterns,
+            "include_private": self.include_private,
+            "output_format": self.output_format,
+        }
+
+
+def load_config(config_path: Optional[str] = None) -> Config:
+    """Load configuration from file.
+
+    Args:
+        config_path: Path to config file (code-doc.toml)
+
+    Returns:
+        Config object
+    """
+    config = Config()
+
+    if not config_path:
+        config_path = os.environ.get("CODE_DOC_CONFIG")
+        if not config_path:
+            config_path = os.path.join(os.getcwd(), "code-doc.toml")
+            if not os.path.exists(config_path):
+                return config
+
+    if not os.path.exists(config_path):
+        return config
+
+    try:
+        with open(config_path, "r", encoding="utf-8") as f:
+            data = toml.load(f)
+
+        if "tool" in data and "code-doc" in data["tool"]:
+            config_data = data["tool"]["code-doc"]
+
+            if "input_patterns" in config_data:
+                config.input_patterns = config_data["input_patterns"]
+            if "output_file" in config_data:
+                config.output_file = config_data["output_file"]
+            if "language" in config_data:
+                config.language = config_data["language"]
+            if "template_style" in config_data:
+                config.template_style = config_data["template_style"]
+            if "syntax_highlighting" in config_data:
+                config.syntax_highlighting = config_data["syntax_highlighting"]
+            if "theme" in config_data:
+                config.theme = config_data["theme"]
+            if "fail_on_warning" in config_data:
+                config.fail_on_warning = config_data["fail_on_warning"]
+            if "exclude_patterns" in config_data:
+                config.exclude_patterns = config_data["exclude_patterns"]
+            if "include_private" in config_data:
+                config.include_private = config_data["include_private"]
+            if "output_format" in config_data:
+                config.output_format = config_data["output_format"]
+
+    except toml.TomlDecodeError as e:
+        raise ValueError(f"Invalid TOML in config file: {e}")
+    except Exception as e:
+        raise ValueError(f"Error reading config file: {e}")
+
+    return config
+
+
+def save_config(config: Config, config_path: str) -> None:
+    """Save configuration to file.
+
+    Args:
+        config: Config object
+        config_path: Path to save config
+    """
+    data = {"tool": {"code-doc": config.to_dict()}}
+
+    with open(config_path, "w", encoding="utf-8") as f:
+        toml.dump(data, f)