diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..592400a
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,59 @@
+
+
+exclude: \.(csv|sql)$|devcontainer\.json
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.0.1
+    hooks:
+      # - id: check-added-large-files
+      - id: check-case-conflict
+      - id: check-json
+      - id: check-merge-conflict
+      - id: check-yaml
+        args: [--unsafe]
+      - id: end-of-file-fixer
+        exclude: "__snapshots__/"
+      - id: fix-encoding-pragma
+        args: [--remove]
+      - id: mixed-line-ending
+      - id: trailing-whitespace
+        args: [--markdown-linebreak-ext=md]
+        exclude: "__snapshots__/"
+
+  - repo: https://github.com/astral-sh/ruff-pre-commit
+    # Ruff version.
+    rev: v0.4.9
+    hooks:
+      # Run the linter.
+      - id: ruff
+        args: [--fix]
+      # Run the formatter.
+      - id: ruff-format
+
+  - repo: https://github.com/pre-commit/mirrors-mypy
+    rev: "v1.8.0"
+    hooks:
+      - id: mypy
+        exclude: migrations/|commands/|scripts/|sandbox/|samples|sdk
+        additional_dependencies:
+          - "pygithub"
+          - "pytest"
+          - "syrupy"
+          - "typer"
+          - "jinja2"
+          - "gitpython"
+          - "types-PyYAML"
+          - "devtools"
+        args:
+          [
+            --pretty,
+            --show-error-codes,
+            --implicit-optional,
+            --follow-imports=silent,
+            --warn-redundant-casts,
+            --warn-unused-ignores,
+            --disallow-any-generics,
+            --check-untyped-defs,
+            --no-implicit-reexport,
+            --disallow-untyped-defs,
+          ]
diff --git a/README.md b/README.md
index 5be7caa..18ad701 100644
--- a/README.md
+++ b/README.md
@@ -1 +1 @@
-# auto-detect-exceptions
\ No newline at end of file
+# auto-detect-exceptions
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..250ea12
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,448 @@
+# This file is automatically @generated by Poetry 2.0.1 and should not be changed by hand.
+
+[[package]]
+name = "black"
+version = "25.1.0"
+description = "The uncompromising code formatter."
+optional = false
+python-versions = ">=3.9"
+groups = ["main"]
+files = [
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+    {file = "black-25.1.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:0e519ecf93120f34243e6b0054db49c00a35f84f195d5bce7e9f5cfc578fc2da"},
+    {file = "black-25.1.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:055e59b198df7ac0b7efca5ad7ff2516bca343276c466be72eb04a3bcc1f82d7"},
+    {file = "black-25.1.0-cp310-cp310-win_amd64.whl", hash = "sha256:db8ea9917d6f8fc62abd90d944920d95e73c83a5ee3383493e35d271aca872e9"},
+    {file = "black-25.1.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:a39337598244de4bae26475f77dda852ea00a93bd4c728e09eacd827ec929df0"},
+    {file = "black-25.1.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:96c1c7cd856bba8e20094e36e0f948718dc688dba4a9d78c3adde52b9e6c2299"},
+    {file = "black-25.1.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:bce2e264d59c91e52d8000d507eb20a9aca4a778731a08cfff7e5ac4a4bb7096"},
+    {file = "black-25.1.0-cp311-cp311-win_amd64.whl", hash = "sha256:172b1dbff09f86ce6f4eb8edf9dede08b1fce58ba194c87d7a4f1a5aa2f5b3c2"},
+    {file = "black-25.1.0-cp312-cp312-macosx_10_13_x86_64.whl", hash = "sha256:4b60580e829091e6f9238c848ea6750efed72140b91b048770b64e74fe04908b"},
+    {file = "black-25.1.0-cp312-cp312-macosx_11_0_arm64.whl", hash = "sha256:1e2978f6df243b155ef5fa7e558a43037c3079093ed5d10fd84c43900f2d8ecc"},
+    {file = "black-25.1.0-cp312-cp312-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:3b48735872ec535027d979e8dcb20bf4f70b5ac75a8ea99f127c106a7d7aba9f"},
+    {file = "black-25.1.0-cp312-cp312-win_amd64.whl", hash = "sha256:ea0213189960bda9cf99be5b8c8ce66bb054af5e9e861249cd23471bd7b0b3ba"},
+    {file = "black-25.1.0-cp313-cp313-macosx_10_13_x86_64.whl", hash = "sha256:8f0b18a02996a836cc9c9c78e5babec10930862827b1b724ddfe98ccf2f2fe4f"},
+    {file = "black-25.1.0-cp313-cp313-macosx_11_0_arm64.whl", hash = "sha256:afebb7098bfbc70037a053b91ae8437c3857482d3a690fefc03e9ff7aa9a5fd3"},
+    {file = "black-25.1.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.manylinux_2_28_x86_64.whl", hash = "sha256:030b9759066a4ee5e5aca28c3c77f9c64789cdd4de8ac1df642c40b708be6171"},
+    {file = "black-25.1.0-cp313-cp313-win_amd64.whl", hash = "sha256:a22f402b410566e2d1c950708c77ebf5ebd5d0d88a6a2e87c86d9fb48afa0d18"},
+    {file = "black-25.1.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:a1ee0a0c330f7b5130ce0caed9936a904793576ef4d2b98c40835d6a65afa6a0"},
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+    {file = "black-25.1.0-cp39-cp39-win_amd64.whl", hash = "sha256:bacabb307dca5ebaf9c118d2d2f6903da0d62c9faa82bd21a33eecc319559355"},
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+]
+
+[package.dependencies]
+click = ">=8.0.0"
+mypy-extensions = ">=0.4.3"
+packaging = ">=22.0"
+pathspec = ">=0.9.0"
+platformdirs = ">=2"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing-extensions = {version = ">=4.0.1", markers = "python_version < \"3.11\""}
+
+[package.extras]
+colorama = ["colorama (>=0.4.3)"]
+d = ["aiohttp (>=3.10)"]
+jupyter = ["ipython (>=7.8.0)", "tokenize-rt (>=3.2.0)"]
+uvloop = ["uvloop (>=0.15.2)"]
+
+[[package]]
+name = "cfgv"
+version = "3.4.0"
+description = "Validate configuration and produce human readable error messages."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "cfgv-3.4.0-py2.py3-none-any.whl", hash = "sha256:b7265b1f29fd3316bfcd2b330d63d024f2bfd8bcb8b0272f8e19a504856c48f9"},
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+]
+
+[[package]]
+name = "click"
+version = "8.1.8"
+description = "Composable command line interface toolkit"
+optional = false
+python-versions = ">=3.7"
+groups = ["main"]
+files = [
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+
+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+groups = ["main", "dev"]
+files = [
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+markers = {main = "platform_system == \"Windows\"", dev = "sys_platform == \"win32\""}
+
+[[package]]
+name = "distlib"
+version = "0.3.8"
+description = "Distribution utilities"
+optional = false
+python-versions = "*"
+groups = ["dev"]
+files = [
+    {file = "distlib-0.3.8-py2.py3-none-any.whl", hash = "sha256:034db59a0b96f8ca18035f36290806a9a6e6bd9d1ff91e45a7f172eb17e51784"},
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+]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.2.2"
+description = "Backport of PEP 654 (exception groups)"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+markers = "python_version < \"3.11\""
+files = [
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+
+[package.extras]
+test = ["pytest (>=6)"]
+
+[[package]]
+name = "filelock"
+version = "3.15.4"
+description = "A platform independent file lock."
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
+    {file = "filelock-3.15.4-py3-none-any.whl", hash = "sha256:6ca1fffae96225dab4c6eaf1c4f4f28cd2568d3ec2a44e15a08520504de468e7"},
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+
+[package.extras]
+docs = ["furo (>=2023.9.10)", "sphinx (>=7.2.6)", "sphinx-autodoc-typehints (>=1.25.2)"]
+testing = ["covdefaults (>=2.3)", "coverage (>=7.3.2)", "diff-cover (>=8.0.1)", "pytest (>=7.4.3)", "pytest-asyncio (>=0.21)", "pytest-cov (>=4.1)", "pytest-mock (>=3.12)", "pytest-timeout (>=2.2)", "virtualenv (>=20.26.2)"]
+typing = ["typing-extensions (>=4.8)"]
+
+[[package]]
+name = "identify"
+version = "2.6.0"
+description = "File identification library for Python"
+optional = false
+python-versions = ">=3.8"
+groups = ["dev"]
+files = [
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+
+[package.extras]
+license = ["ukkonen"]
+
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
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+]
+
+[[package]]
+name = "libcst"
+version = "1.6.0"
+description = "A concrete syntax tree with AST-like properties for Python 3.0 through 3.13 programs."
+optional = false
+python-versions = ">=3.9"
+groups = ["main"]
+files = [
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+    {file = "typing_extensions-4.12.2.tar.gz", hash = "sha256:1a7ead55c7e559dd4dee8856e3a88b41225abfe1ce8df57b7c13915fe121ffb8"},
+]
+
+[[package]]
+name = "virtualenv"
+version = "20.26.3"
+description = "Virtual Python Environment builder"
+optional = false
+python-versions = ">=3.7"
+groups = ["dev"]
+files = [
+    {file = "virtualenv-20.26.3-py3-none-any.whl", hash = "sha256:8cc4a31139e796e9a7de2cd5cf2489de1217193116a8fd42328f1bd65f434589"},
+    {file = "virtualenv-20.26.3.tar.gz", hash = "sha256:4c43a2a236279d9ea36a0d76f98d84bd6ca94ac4e0f4a3b9d46d05e10fea542a"},
+]
+
+[package.dependencies]
+distlib = ">=0.3.7,<1"
+filelock = ">=3.12.2,<4"
+platformdirs = ">=3.9.1,<5"
+
+[package.extras]
+docs = ["furo (>=2023.7.26)", "proselint (>=0.13)", "sphinx (>=7.1.2,!=7.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=23.6)"]
+test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23.1)", "pytest (>=7.4)", "pytest-env (>=0.8.2)", "pytest-freezer (>=0.4.8)", "pytest-mock (>=3.11.1)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)", "setuptools (>=68)", "time-machine (>=2.10)"]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "^3.10"
+content-hash = "405f20ec70c3102d2f60a502f9edd15e14011fbce5503bd0b1325c62a3ec1145"
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..fd6a4ed
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,30 @@
+[project]
+name = "auto-detect-exceptions"
+version = "0.1.0"
+description = ""
+authors = [
+    { name = "lucemia", email = "lucemia@gmail.com" },
+]
+readme = "README.md"
+
+[tool.poetry]
+packages = [
+    { include = "auto_detect_exceptions", from = "src" }
+]
+
+[project.scripts]
+detect1 = "auto_detect_exceptions.cli:main"
+
+[tool.poetry.dependencies]
+python = "^3.10"
+libcst = "^1.6.0"
+black = "^25.1.0"
+
+
+[tool.poetry.group.dev.dependencies]
+pytest = "^8.2.2"
+pre-commit = "^3.7.1"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
diff --git a/samples/main.py b/samples/main.py
new file mode 100644
index 0000000..392d7fd
--- /dev/null
+++ b/samples/main.py
@@ -0,0 +1,8 @@
+def ze():
+    """
+    Raises:
+        Exception: Description of when this error is raised.
+        ValueError: Description of when this error is raised.
+    """
+    raise Exception("ze")
+    raise ValueError("ze")
diff --git a/src/auto_detect_exceptions/__init__.py b/src/auto_detect_exceptions/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/auto_detect_exceptions/ast_utils.py b/src/auto_detect_exceptions/ast_utils.py
new file mode 100644
index 0000000..6641d98
--- /dev/null
+++ b/src/auto_detect_exceptions/ast_utils.py
@@ -0,0 +1,61 @@
+import ast
+from typing import Dict, Optional
+
+
+def parse_python_code(source_code: str) -> ast.Module:
+    """
+    Parses Python source code into an Abstract Syntax Tree (AST).
+
+    Args:
+        source_code (str): The Python source code as a string.
+
+    Returns:
+        ast.Module: The root AST node of the parsed code.
+    """
+    return ast.parse(source_code)
+
+
+def extract_functions(tree: ast.Module) -> Dict[str, ast.FunctionDef]:
+    """
+    Extracts all function definitions from an AST tree.
+
+    Args:
+        tree (ast.Module): The AST representation of the code.
+
+    Returns:
+        Dict[str, ast.FunctionDef]: A dictionary mapping function names to their AST nodes.
+    """
+    functions = {}
+    for node in ast.walk(tree):
+        if isinstance(node, ast.FunctionDef):  # Include only regular functions
+            functions[node.name] = node
+    return functions
+
+
+def get_docstring(node: ast.FunctionDef) -> Optional[str]:
+    """
+    Retrieves the docstring from a function node.
+
+    Args:
+        node (ast.FunctionDef): The AST node representing a function.
+
+    Returns:
+        Optional[str]: The function's docstring if present, otherwise None.
+    """
+    return ast.get_docstring(node)
+
+
+def has_exceptions_section(docstring: Optional[str]) -> bool:
+    """
+    Checks if a docstring contains an 'Exceptions' or 'Raises' section.
+
+    Args:
+        docstring (Optional[str]): The docstring text.
+
+    Returns:
+        bool: True if the docstring contains an exceptions section, False otherwise.
+    """
+    if docstring is None:
+        return False
+    docstring_lower = docstring.lower()
+    return "raises:" in docstring_lower or "exceptions:" in docstring_lower
diff --git a/src/auto_detect_exceptions/bk/exception_analyzer copy.py b/src/auto_detect_exceptions/bk/exception_analyzer copy.py
new file mode 100644
index 0000000..1870cf5
--- /dev/null
+++ b/src/auto_detect_exceptions/bk/exception_analyzer copy.py	
@@ -0,0 +1,343 @@
+import ast
+import inspect
+import importlib
+import sys
+from typing import Set, Tuple, Dict, Union, List, Any
+from pathlib import Path
+
+
+def get_module_contents(module_name: str) -> Dict[str, Any]:
+    """
+    Get all functions and classes from a module.
+
+    Args:
+        module_name (str): The name of the module to inspect.
+
+    Returns:
+        Dict[str, Any]: A dictionary of object names and their corresponding objects.
+    """
+    module = importlib.import_module(module_name)
+    return {name: obj for name, obj in inspect.getmembers(module)}
+
+
+def get_ast_from_object(obj: Any) -> ast.AST:
+    """
+    Get the AST representation of an object (function or class).
+
+    Args:
+        obj (Any): The object to analyze.
+
+    Returns:
+        ast.AST: The AST representation of the object.
+    """
+    try:
+        source = inspect.getsource(obj)
+        return ast.parse(source).body[0]
+    except (OSError, TypeError):
+        return None
+
+
+def analyze_node(
+    node: ast.AST, global_scope: Dict[str, Dict[str, Any]], module_name: str
+) -> Tuple[Set[str], Dict[str, Union[str, List[str]]]]:
+    """
+    Analyze a node (function or class) for called functions and potentially raised exceptions with messages,
+    including exceptions from sub-function calls across different modules.
+
+    Args:
+        node (ast.AST): The AST node to analyze.
+        global_scope (Dict[str, Dict[str, Any]]): A dictionary of modules and their contents.
+        module_name (str): The name of the module containing the current node.
+
+    Returns:
+        Tuple[Set[str], Dict[str, Union[str, List[str]]]]: A tuple containing:
+            1. Set of names of functions called within the analyzed node.
+            2. Dictionary of exceptions that may be raised by the node,
+               where keys are exception types and values are either a string message
+               or a list of possible messages.
+    """
+    function_calls: Set[str] = set()
+    potentially_raised_exceptions: Dict[str, Union[str, List[str]]] = {}
+    handled_exceptions: Set[str] = set()
+    reraised_exceptions: Set[str] = set()
+
+    class ExceptionAnalyzer(ast.NodeVisitor):
+        def visit_Call(self, node: ast.Call) -> None:
+            if isinstance(node.func, ast.Name):
+                function_name = node.func.id
+                function_calls.add(function_name)
+                self.analyze_call(function_name)
+            elif isinstance(node.func, ast.Attribute):
+                if isinstance(node.func.value, ast.Name):
+                    module_name = node.func.value.id
+                    function_name = node.func.attr
+                    function_calls.add(f"{module_name}.{function_name}")
+                    self.analyze_call(function_name, module_name)
+            self.generic_visit(node)
+
+        def analyze_call(self, function_name: str, module_name: str = None) -> None:
+            for mod_name, mod_contents in global_scope.items():
+                if module_name and mod_name != module_name:
+                    continue
+                if function_name in mod_contents:
+                    sub_obj = mod_contents[function_name]
+                    sub_node = get_ast_from_object(sub_obj)
+                    if sub_node:
+                        _, sub_exceptions = analyze_node(
+                            sub_node, global_scope, mod_name
+                        )
+                        self.update_exceptions(sub_exceptions)
+                    break
+
+        def update_exceptions(
+            self, sub_exceptions: Dict[str, Union[str, List[str]]]
+        ) -> None:
+            for exc, msg in sub_exceptions.items():
+                if exc in potentially_raised_exceptions:
+                    if isinstance(potentially_raised_exceptions[exc], str):
+                        potentially_raised_exceptions[exc] = [
+                            potentially_raised_exceptions[exc],
+                            msg,
+                        ]
+                    elif isinstance(potentially_raised_exceptions[exc], list):
+                        if isinstance(msg, list):
+                            potentially_raised_exceptions[exc].extend(msg)
+                        else:
+                            potentially_raised_exceptions[exc].append(msg)
+                else:
+                    potentially_raised_exceptions[exc] = msg
+
+        def visit_Raise(self, node: ast.Raise) -> None:
+            if node.exc is None:
+                if self.current_except_clause:
+                    reraised_exceptions.update(self.current_except_clause)
+                else:
+                    potentially_raised_exceptions["Unknown"] = "Re-raised exception"
+            else:
+                exc_name, exc_msg = self.get_exception_info(node.exc)
+
+                if exc_name in potentially_raised_exceptions:
+                    if isinstance(potentially_raised_exceptions[exc_name], str):
+                        potentially_raised_exceptions[exc_name] = [
+                            potentially_raised_exceptions[exc_name],
+                            exc_msg,
+                        ]
+                    elif isinstance(potentially_raised_exceptions[exc_name], list):
+                        potentially_raised_exceptions[exc_name].append(exc_msg)
+                else:
+                    potentially_raised_exceptions[exc_name] = exc_msg
+
+            self.generic_visit(node)
+
+        def get_exception_info(self, node: ast.expr) -> Tuple[str, str]:
+            if isinstance(node, ast.Call):
+                if isinstance(node.func, ast.Name):
+                    exc_name = node.func.id
+                elif isinstance(node.func, ast.Attribute):
+                    exc_name = node.func.attr
+                else:
+                    exc_name = "Unknown"
+
+                if node.args:
+                    if isinstance(node.args[0], ast.Str):
+                        exc_msg = node.args[0].s
+                    elif isinstance(node.args[0], ast.Constant) and isinstance(
+                        node.args[0].value, str
+                    ):
+                        exc_msg = node.args[0].value
+                    else:
+                        exc_msg = "Dynamic message"
+                else:
+                    exc_msg = "No message"
+            elif isinstance(node, ast.Name):
+                exc_name = node.id
+                exc_msg = "No message"
+            else:
+                exc_name = "Unknown"
+                exc_msg = "Unknown message"
+
+            return exc_name, exc_msg
+
+        def visit_Assert(self, node: ast.Assert) -> None:
+            potentially_raised_exceptions["AssertionError"] = "Assertion failed"
+            self.generic_visit(node)
+
+        def visit_Try(self, node: ast.Try) -> None:
+            outer_exceptions = (
+                set(self.exception_stack[-1]) if self.exception_stack else set()
+            )
+
+            for handler in node.handlers:
+                if handler.type is None:  # bare except:
+                    handled_exceptions.update(potentially_raised_exceptions.keys())
+                    self.exception_stack.append(
+                        set(potentially_raised_exceptions.keys())
+                    )
+                    self.current_except_clause = set(
+                        potentially_raised_exceptions.keys()
+                    )
+                elif isinstance(handler.type, ast.Name):
+                    handled_exceptions.add(handler.type.id)
+                    self.exception_stack.append({handler.type.id})
+                    self.current_except_clause = {handler.type.id}
+                elif isinstance(handler.type, ast.Tuple):
+                    handled_types = {
+                        elt.id for elt in handler.type.elts if isinstance(elt, ast.Name)
+                    }
+                    handled_exceptions.update(handled_types)
+                    self.exception_stack.append(handled_types)
+                    self.current_except_clause = handled_types
+
+                self.visit(handler)
+                self.exception_stack.pop()
+                self.current_except_clause = set()
+
+            self.exception_stack.append(outer_exceptions)
+            for item in node.body:
+                self.visit(item)
+            self.exception_stack.pop()
+
+            if node.orelse:
+                self.exception_stack.append(outer_exceptions)
+                for item in node.orelse:
+                    self.visit(item)
+                self.exception_stack.pop()
+
+            if node.finalbody:
+                self.exception_stack.append(set())
+                for item in node.finalbody:
+                    self.visit(item)
+                self.exception_stack.pop()
+
+    analyzer = ExceptionAnalyzer()
+    analyzer.visit(node)
+
+    actually_raised_exceptions = {
+        exc: msg
+        for exc, msg in potentially_raised_exceptions.items()
+        if exc not in handled_exceptions or exc in reraised_exceptions
+    }
+
+    return function_calls, actually_raised_exceptions
+
+
+def analyze_file(
+    file_path: str, analyzed_files: Set[str] = None
+) -> Dict[str, Tuple[Set[str], Dict[str, Union[str, List[str]]]]]:
+    """
+    Analyze all functions and classes in a Python file and its imported modules.
+
+    Args:
+        file_path (str): Path to the Python file to analyze.
+        analyzed_files (Set[str], optional): Set of already analyzed file paths to avoid circular imports.
+
+    Returns:
+        Dict[str, Tuple[Set[str], Dict[str, Union[str, List[str]]]]]: A dictionary where
+        keys are function/method names and values are tuples containing:
+            1. Set of names of functions called within the analyzed function/method.
+            2. Dictionary of exceptions that may be raised by the function/method.
+    """
+    if analyzed_files is None:
+        analyzed_files = set()
+
+    if file_path in analyzed_files:
+        return {}
+
+    analyzed_files.add(file_path)
+
+    with open(file_path, "r") as file:
+        content = file.read()
+
+    tree = ast.parse(content)
+
+    # Get the module name from the file path
+    module_name = Path(file_path).stem
+
+    # Add the directory containing the file to sys.path to allow imports
+    sys.path.insert(0, str(Path(file_path).parent))
+
+    # Create a dictionary of global contents for the current module
+    global_scope = {module_name: {}}
+
+    # Analyze imported modules
+    for node in ast.walk(tree):
+        if isinstance(node, ast.Import):
+            for alias in node.names:
+                imported_module = alias.name
+                try:
+                    global_scope[imported_module] = get_module_contents(imported_module)
+                except ImportError:
+                    print(f"Warning: Could not import module {imported_module}")
+        elif isinstance(node, ast.ImportFrom):
+            if node.level == 0:  # absolute import
+                module = node.module
+            else:  # relative import
+                module = f"{'.'.join([''] * (node.level - 1))}{node.module}"
+            try:
+                imported_contents = get_module_contents(module)
+                for alias in node.names:
+                    if alias.name == "*":
+                        global_scope[module] = imported_contents
+                    else:
+                        if module not in global_scope:
+                            global_scope[module] = {}
+                        global_scope[module][alias.name] = imported_contents.get(
+                            alias.name
+                        )
+            except ImportError:
+                print(f"Warning: Could not import from module {module}")
+
+    results = {}
+    for node in ast.walk(tree):
+        if isinstance(node, (ast.FunctionDef, ast.ClassDef)):
+            if isinstance(node, ast.FunctionDef):
+                object_name = node.name
+                global_scope[module_name][object_name] = compile(
+                    ast.Module(body=[node], type_ignores=[]),
+                    filename="<ast>",
+                    mode="exec",
+                )
+                function_calls, exceptions = analyze_node(
+                    node, global_scope, module_name
+                )
+                results[f"{module_name}.{object_name}"] = (function_calls, exceptions)
+            elif isinstance(node, ast.ClassDef):
+                class_name = node.name
+                for sub_node in node.body:
+                    if isinstance(sub_node, ast.FunctionDef):
+                        method_name = sub_node.name
+                        full_name = f"{module_name}.{class_name}.{method_name}"
+                        global_scope[module_name][full_name] = compile(
+                            ast.Module(body=[sub_node], type_ignores=[]),
+                            filename="<ast>",
+                            mode="exec",
+                        )
+                        function_calls, exceptions = analyze_node(
+                            sub_node, global_scope, module_name
+                        )
+                        results[full_name] = (function_calls, exceptions)
+
+    # Remove the added path
+    sys.path.pop(0)
+
+    return results
+
+
+# Example usage
+if __name__ == "__main__":
+    file_path = "example.py"  # Replace with the path to your Python file
+    analysis_results = analyze_file(file_path)
+
+    for func_name, (calls, exceptions) in analysis_results.items():
+        print(f"\nAnalysis of {func_name}:")
+        print("Functions called:")
+        for call in calls:
+            print(f"- {call}")
+        print("Exceptions that may be raised:")
+        for exc, msg in exceptions.items():
+            if isinstance(msg, list):
+                print(f"- {exc}: Multiple messages:")
+                for m in msg:
+                    print(f"  - {m}")
+            else:
+                print(f"- {exc}: {msg}")
diff --git a/src/auto_detect_exceptions/bk/exception_analyzer.py b/src/auto_detect_exceptions/bk/exception_analyzer.py
new file mode 100644
index 0000000..aa37683
--- /dev/null
+++ b/src/auto_detect_exceptions/bk/exception_analyzer.py
@@ -0,0 +1,62 @@
+from typing import Any
+import ast
+
+
+class ExceptionVisitor(ast.NodeVisitor):
+    def __init__(self) -> None:
+        self.potentially_raised_exceptions: set[str] = set()
+        self.handled_exceptions: set[str] = (
+            set()
+        )  # exceptions caught in the current function
+
+    def visit_Assert(self, node: ast.Assert) -> Any:
+        self.potentially_raised_exceptions.add("AssertionError")
+        return super().generic_visit(node)
+
+    def visit_Raise(self, node: ast.Raise) -> None:
+        if node.exc is None:
+            # re-raise exception
+            self.potentially_raised_exceptions.update(self.handled_exceptions)
+        else:
+            exc_name, exc_msg = self.get_exception_info(node.exc)
+
+            if exc_name not in self.potentially_raised_exceptions:
+                self.potentially_raised_exceptions.add(exc_name)
+
+        self.generic_visit(node)
+
+    def get_exception_info(self, node: ast.expr) -> tuple[str, str]:
+        if isinstance(node, ast.Call):
+            if isinstance(node.func, ast.Name):
+                exc_name = node.func.id
+            elif isinstance(node.func, ast.Attribute):
+                exc_name = node.func.attr
+            else:
+                exc_name = "Unknown"
+
+            if node.args:
+                if isinstance(node.args[0], ast.Str):
+                    exc_msg = node.args[0].s
+                elif isinstance(node.args[0], ast.Constant) and isinstance(
+                    node.args[0].value, str
+                ):
+                    exc_msg = node.args[0].value
+                else:
+                    exc_msg = "Dynamic message"
+            else:
+                exc_msg = "No message"
+        elif isinstance(node, ast.Name):
+            exc_name = node.id
+            exc_msg = "No message"
+        else:
+            exc_name = "Unknown"
+            exc_msg = "Unknown message"
+
+        return exc_name, exc_msg
+
+    def visit_Try(self, node: ast.Try) -> Any:
+        # for handler in node.handlers:
+        #     if handler.type is None: # bare exception:
+
+        #     self.handled_exceptions.add(handler.type)
+        return super().visit_Try(node)
diff --git a/src/auto_detect_exceptions/cli.py b/src/auto_detect_exceptions/cli.py
new file mode 100644
index 0000000..cce9c3c
--- /dev/null
+++ b/src/auto_detect_exceptions/cli.py
@@ -0,0 +1,94 @@
+import argparse
+from .file_utils import find_python_files, read_python_file, write_python_file
+from .ast_utils import (
+    parse_python_code,
+    extract_functions,
+    get_docstring,
+    has_exceptions_section,
+)
+from .exception_analysis import get_unhandled_exceptions
+from .docstring_utils import update_function_docstrings
+
+
+def process_directory(directory: str, modify: bool) -> None:
+    """
+    Process a directory, analyzing Python files and optionally modifying them.
+
+    Args:
+        directory (str): The directory to process.
+        modify (bool): If True, modifies files; otherwise, generates a report.
+    """
+    python_files = find_python_files(directory)
+    missing_exceptions = {}
+
+    for file_path in python_files:
+        source_code = read_python_file(file_path)
+        tree = parse_python_code(source_code)
+        functions = extract_functions(tree)
+        function_exceptions = {}
+
+        for func_name, func_node in functions.items():
+            docstring = get_docstring(func_node)
+
+            if not has_exceptions_section(docstring):
+                exceptions = get_unhandled_exceptions(func_node, functions)
+                if exceptions:
+                    function_exceptions[func_name] = exceptions
+
+        if function_exceptions:
+            missing_exceptions[file_path] = function_exceptions
+
+            if modify:
+                updated_code = update_function_docstrings(
+                    source_code, function_exceptions
+                )
+                write_python_file(file_path, updated_code)
+
+    if not modify:
+        generate_report(missing_exceptions)
+
+
+def generate_report(missing_exceptions: dict) -> None:
+    """
+    Prints a report of functions missing exception documentation.
+
+    Args:
+        missing_exceptions (dict): A dictionary mapping file paths to missing exception sections.
+    """
+    print("\n=== Report: Missing Exception Docstrings ===\n")
+
+    if not missing_exceptions:
+        print("✅ All functions have proper exception documentation!")
+        return
+
+    for file_path, functions in missing_exceptions.items():
+        print(f"\n📂 File: {file_path}")
+        for func_name, exceptions in functions.items():
+            print(f"  🔹 Function `{func_name}()` is missing exception documentation.")
+            print(f"    Expected exceptions: {', '.join(exceptions)}")
+
+
+def main():
+    """
+    Entry point for the CLI tool.
+    """
+    parser = argparse.ArgumentParser(
+        description="Analyze Python files to ensure functions have proper exception documentation."
+    )
+
+    parser.add_argument(
+        "directory", type=str, help="Directory to scan for Python files"
+    )
+    parser.add_argument(
+        "--update",
+        action="store_true",
+        help="Modify files to add missing exception docstrings",
+    )
+
+    args = parser.parse_args()
+
+    process_directory(args.directory, modify=args.update)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/src/auto_detect_exceptions/detect.py b/src/auto_detect_exceptions/detect.py
new file mode 100644
index 0000000..f3dedde
--- /dev/null
+++ b/src/auto_detect_exceptions/detect.py
@@ -0,0 +1,44 @@
+import importlib.util
+import ast
+from .exception_analyzer import ExceptionVisitor
+
+
+def get_file_path_from_full_path(full_path: str) -> str:
+    module_path, _ = full_path.rsplit(".", 1)  # Split off the function name
+
+    # Convert module path to a probable file path
+    file_path = module_path.replace(".", "/") + ".py"
+
+    # Check if the module is actually installed and find the exact path
+    try:
+        # Try to find the module without importing it
+        spec = importlib.util.find_spec(module_path)
+        if spec and spec.origin:
+            file_path = spec.origin  # Update with the exact path from the spec
+    except ImportError:
+        # If the module isn't found, handle or raise error
+        print(f"Module {module_path} not found in system.")
+        raise ModuleNotFoundError()
+
+    return file_path
+
+
+def analyze_function(node) -> set[str]:
+    analyzer = ExceptionVisitor()
+    analyzer.visit(node)
+
+
+def detect_function_exceptions(func: str) -> set[str]:
+    file_path = get_file_path_from_full_path(func)
+
+    with open(file_path) as ifile:
+        content = ifile.read()
+
+    tree = ast.parse(content)
+
+    for node in ast.walk(tree):
+        if isinstance(node, ast.FunctionDef):
+            if node.name == func.split(".")[-1]:
+                return analyze_function(node)
+
+    raise ModuleNotFoundError()
diff --git a/src/auto_detect_exceptions/docstring_utils.py b/src/auto_detect_exceptions/docstring_utils.py
new file mode 100644
index 0000000..e3daf49
--- /dev/null
+++ b/src/auto_detect_exceptions/docstring_utils.py
@@ -0,0 +1,75 @@
+import libcst as cst
+from typing import Dict, Set
+
+
+class DocstringUpdater(cst.CSTTransformer):
+    """
+    Transformer that updates function docstrings to include missing exceptions.
+    """
+
+    def __init__(self, function_exceptions: Dict[str, Set[str]]):
+        self.function_exceptions = function_exceptions
+
+    def leave_FunctionDef(
+        self, original_node: cst.FunctionDef, updated_node: cst.FunctionDef
+    ) -> cst.FunctionDef:
+        func_name = original_node.name.value
+        if func_name not in self.function_exceptions:
+            return updated_node  # No changes needed
+
+        # Extract the existing docstring
+        existing_docstring = None
+        if isinstance(original_node.body.body[0], cst.SimpleStatementLine):
+            first_stmt = original_node.body.body[0].body[0]
+            if isinstance(first_stmt, cst.Expr) and isinstance(
+                first_stmt.value, cst.SimpleString
+            ):
+                existing_docstring = first_stmt.value.value.strip(
+                    "\"'"
+                )  # Strip triple quotes
+
+        # Generate new exceptions section
+        exception_lines = ["Raises:"]
+        for exc in sorted(self.function_exceptions[func_name]):
+            exception_lines.append(
+                f"    {exc}: Description of when this error is raised."
+            )
+        exception_text = "\n".join(exception_lines)
+
+        # Construct new docstring
+        if existing_docstring:
+            new_docstring = f"{existing_docstring}\n\n{exception_text}"
+        else:
+            new_docstring = exception_text
+
+        # Replace or insert the docstring
+        new_docstring_node = cst.SimpleStatementLine(
+            body=[cst.Expr(value=cst.SimpleString(f'"""{new_docstring}"""'))]
+        )
+
+        # Insert new docstring into the function body
+        new_body = (
+            [new_docstring_node] + list(updated_node.body.body[1:])
+            if existing_docstring
+            else [new_docstring_node] + list(updated_node.body.body)
+        )
+
+        return updated_node.with_changes(body=cst.IndentedBlock(body=new_body))
+
+
+def update_function_docstrings(
+    source_code: str, function_exceptions: Dict[str, Set[str]]
+) -> str:
+    """
+    Uses `libcst` to update function docstrings in a Python source file.
+
+    Args:
+        source_code (str): The original source code.
+        function_exceptions (Dict[str, Set[str]]): A mapping of function names to their exceptions.
+
+    Returns:
+        str: The modified source code.
+    """
+    tree = cst.parse_module(source_code)
+    updated_tree = tree.visit(DocstringUpdater(function_exceptions))
+    return updated_tree.code
diff --git a/src/auto_detect_exceptions/exception_analysis.py b/src/auto_detect_exceptions/exception_analysis.py
new file mode 100644
index 0000000..aa7fceb
--- /dev/null
+++ b/src/auto_detect_exceptions/exception_analysis.py
@@ -0,0 +1,118 @@
+import ast
+from typing import Dict, Set, Optional
+
+
+def get_called_function_name(node: ast.Call) -> Optional[str]:
+    """
+    Extracts the function name from an `ast.Call` node.
+
+    Args:
+        node (ast.Call): The AST node representing a function call.
+
+    Returns:
+        Optional[str]: The function name if available, otherwise None.
+    """
+    if isinstance(node.func, ast.Name):
+        return node.func.id  # Direct function call: foo()
+    elif isinstance(node.func, ast.Attribute):
+        return node.func.attr  # Method call: obj.foo()
+    return None
+
+
+MAX_RECURSION_DEPTH = 50  # Prevent excessive recursion
+
+
+def get_unhandled_exceptions(
+    node: ast.FunctionDef,
+    user_defined_funcs: Dict[str, ast.FunctionDef],
+    visited: Optional[Set[str]] = None,
+    depth: int = 0,
+) -> Set[str]:
+    """
+    Identifies all unhandled exceptions that a function may raise.
+
+    Args:
+        node (ast.FunctionDef): The AST node of the function.
+        user_defined_funcs (Dict[str, ast.FunctionDef]): A mapping of function names to their AST nodes.
+        visited (Optional[Set[str]]): A set of already visited functions to prevent infinite loops.
+        depth (int): Current recursion depth.
+
+    Returns:
+        Set[str]: A set of exception class names that may be raised.
+    """
+    if visited is None:
+        visited = set()
+
+    if depth > MAX_RECURSION_DEPTH:
+        print(
+            f"WARNING: Maximum recursion depth reached in `{node.name}`, stopping further analysis."
+        )
+        return set()
+
+    exceptions = set()
+    handled_exceptions = set()
+
+    for child in ast.walk(node):
+        # Detect explicit `raise` statements
+        if isinstance(child, ast.Raise) and child.exc:
+            if isinstance(child.exc, ast.Call) and isinstance(child.exc.func, ast.Name):
+                exceptions.add(child.exc.func.id)
+            elif isinstance(child.exc, ast.Name):
+                exceptions.add(child.exc.id)
+
+        # Detect try/except blocks and track caught exceptions
+        elif isinstance(child, ast.Try):
+            for handler in child.handlers:
+                if handler.type and isinstance(handler.type, ast.Name):
+                    handled_exceptions.add(handler.type.id)
+
+        # Detect function calls
+        elif isinstance(child, ast.Call):
+            func_name = get_called_function_name(child)
+            if func_name and func_name in user_defined_funcs:
+                # Pass `visited` set to avoid infinite recursion
+                exceptions |= resolve_exceptions_recursively(
+                    func_name, user_defined_funcs, visited, depth + 1
+                )
+
+    # Remove handled exceptions from the detected set
+    return exceptions - handled_exceptions
+
+
+def resolve_exceptions_recursively(
+    func_name: str,
+    user_funcs: Dict[str, ast.FunctionDef],
+    visited: Optional[Set[str]] = None,
+    depth: int = 0,
+) -> Set[str]:
+    """
+    Recursively gathers exceptions from user-defined function calls.
+
+    Args:
+        func_name (str): The function name to analyze.
+        user_funcs (Dict[str, ast.FunctionDef]): A dictionary mapping function names to their AST nodes.
+        visited (Set[str]): A set to track visited functions and prevent infinite recursion.
+        depth (int): Current recursion depth.
+
+    Returns:
+        Set[str]: A set of exception names that may propagate from the function.
+    """
+    if visited is None:
+        visited = set()
+
+    if depth > MAX_RECURSION_DEPTH:
+        print(
+            f"WARNING: Maximum recursion depth reached in `{func_name}`, stopping further analysis."
+        )
+        return set()  # Prevent deep recursion
+
+    if func_name in visited:
+        return set()  # Prevent infinite recursion loops
+
+    if func_name not in user_funcs:
+        return set()  # Ignore functions not defined in this module
+
+    visited.add(func_name)
+    func_node = user_funcs[func_name]
+
+    return get_unhandled_exceptions(func_node, user_funcs, visited, depth)
diff --git a/src/auto_detect_exceptions/file_utils.py b/src/auto_detect_exceptions/file_utils.py
new file mode 100644
index 0000000..c4cbae4
--- /dev/null
+++ b/src/auto_detect_exceptions/file_utils.py
@@ -0,0 +1,46 @@
+from pathlib import Path
+from typing import List
+
+
+def find_python_files(directory: str) -> List[Path]:
+    """
+    Recursively finds all Python (.py) files in the given directory.
+
+    Args:
+        directory (str): The directory to search in.
+
+    Returns:
+        List[Path]: A list of Path objects for Python files.
+    """
+    return [p for p in Path(directory).rglob("*.py") if p.is_file()]
+
+
+def read_python_file(filepath: Path) -> str:
+    """
+    Reads the content of a Python file.
+
+    Args:
+        filepath (Path): The path to the Python file.
+
+    Returns:
+        str: The content of the file as a string.
+    """
+    try:
+        return filepath.read_text(encoding="utf-8")
+    except Exception as e:
+        print(f"Error reading {filepath}: {e}")
+        return ""
+
+
+def write_python_file(filepath: Path, updated_code: str) -> None:
+    """
+    Writes updated content back to a Python file.
+
+    Args:
+        filepath (Path): The path to the Python file.
+        updated_code (str): The modified source code to write.
+    """
+    try:
+        filepath.write_text(updated_code, encoding="utf-8")
+    except Exception as e:
+        print(f"Error writing to {filepath}: {e}")
diff --git a/src/auto_detect_exceptions/main.py b/src/auto_detect_exceptions/main.py
new file mode 100644
index 0000000..ce62048
--- /dev/null
+++ b/src/auto_detect_exceptions/main.py
@@ -0,0 +1,88 @@
+import ast
+
+from .exception_analyzer import ExceptionVisitor
+
+
+def analyze_function(
+    func_node: ast.FunctionDef,
+) -> tuple[set[str], dict[str, str | list[str]]]:
+    """
+    Analyze a function node for called functions and potentially raised exceptions with messages.
+
+    Args:
+        func_node (ast.FunctionDef): The function node to analyze.
+
+    Returns:
+        Tuple[Set[str], Dict[str, Union[str, List[str]]]]: A tuple containing:
+            1. Set of names of functions called within the analyzed function.
+            2. Dictionary of exceptions that may be raised by the function,
+               where keys are exception types and values are either a string message
+               or a list of possible messages.
+    """
+
+    analyzer = ExceptionVisitor()
+    analyzer.visit(func_node)
+
+    # Calculate exceptions that may actually be raised
+    actually_raised_exceptions = {
+        exc: msg
+        for exc, msg in analyzer.potentially_raised_exceptions.items()
+        if exc not in analyzer.handled_exceptions or exc in analyzer.reraised_exceptions
+    }
+
+    return analyzer.function_calls, actually_raised_exceptions
+
+
+def analyze_file(
+    file_path: str,
+) -> dict[str, tuple[set[str], dict[str, str | list[str]]]]:
+    """
+    Analyze all functions in a Python file.
+
+    Args:
+        file_path (str): Path to the Python file to analyze.
+
+    Returns:
+        Dict[str, Tuple[Set[str], Dict[str, Union[str, List[str]]]]]: A dictionary where
+        keys are function names and values are tuples containing:
+            1. Set of names of functions called within the analyzed function.
+            2. Dictionary of exceptions that may be raised by the function.
+    """
+    with open(file_path) as file:
+        content = file.read()
+
+    tree = ast.parse(content)
+
+    results = {}
+    for node in ast.walk(tree):
+        if isinstance(node, ast.FunctionDef):
+            function_name = node.name
+            function_calls, exceptions = analyze_function(node)
+            results[function_name] = (function_calls, exceptions)
+
+    return results
+
+
+def analysis_exception(file_path: str):
+    analysis_results = analyze_file(file_path)
+
+    for func_name, (calls, exceptions) in analysis_results.items():
+        print(f"\nAnalysis of {func_name}:")
+        print("Functions called:")
+        for call in calls:
+            print(f"- {call}")
+        print("Exceptions that may be raised:")
+        for exc, msg in exceptions.items():
+            if isinstance(msg, list):
+                print(f"- {exc}: Multiple messages:")
+                for m in msg:
+                    print(f"  - {m}")
+            else:
+                print(f"- {exc}: {msg}")
+
+
+# Example usage
+import typer
+
+if __name__ == "__main__":
+    typer.run(analysis_exception)
diff --git a/src/auto_detect_exceptions/tests/__init__.py b/src/auto_detect_exceptions/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/auto_detect_exceptions/tests/test_ast_utils.py b/src/auto_detect_exceptions/tests/test_ast_utils.py
new file mode 100644
index 0000000..0d91680
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_ast_utils.py
@@ -0,0 +1,64 @@
+import unittest
+import ast
+from ..ast_utils import (
+    parse_python_code,
+    extract_functions,
+    get_docstring,
+    has_exceptions_section,
+)
+
+
+class TestASTUtils(unittest.TestCase):
+    def setUp(self):
+        """Set up test source code."""
+        self.source_code = '''
+def foo():
+    """This is a sample function.
+
+    Raises:
+        ValueError: If something goes wrong.
+    """
+    raise ValueError("Error")
+
+def bar():
+    """This function has no exceptions section."""
+    pass
+
+def baz():
+    pass
+        '''
+        self.tree = parse_python_code(self.source_code)
+        self.functions = extract_functions(self.tree)
+
+    def test_parse_python_code(self):
+        """Test that parsing creates an AST module."""
+        self.assertIsInstance(self.tree, ast.Module)
+
+    def test_extract_functions(self):
+        """Test extracting function definitions."""
+        self.assertIn("foo", self.functions)
+        self.assertIn("bar", self.functions)
+        self.assertIn("baz", self.functions)
+        self.assertEqual(len(self.functions), 3)
+
+    def test_get_docstring(self):
+        """Test retrieving function docstrings."""
+        self.assertEqual(
+            get_docstring(self.functions["foo"]).strip(),
+            "This is a sample function.\n\n    Raises:\n        ValueError: If something goes wrong.",
+        )
+        self.assertEqual(
+            get_docstring(self.functions["bar"]).strip(),
+            "This function has no exceptions section.",
+        )
+        self.assertIsNone(get_docstring(self.functions["baz"]))
+
+    def test_has_exceptions_section(self):
+        """Test checking if a docstring contains an 'Exceptions' or 'Raises' section."""
+        self.assertTrue(has_exceptions_section(get_docstring(self.functions["foo"])))
+        self.assertFalse(has_exceptions_section(get_docstring(self.functions["bar"])))
+        self.assertFalse(has_exceptions_section(get_docstring(self.functions["baz"])))
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/src/auto_detect_exceptions/tests/test_cli.py b/src/auto_detect_exceptions/tests/test_cli.py
new file mode 100644
index 0000000..b390141
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_cli.py
@@ -0,0 +1,34 @@
+import unittest
+import tempfile
+from pathlib import Path
+from ..cli import process_directory
+
+
+class TestCLI(unittest.TestCase):
+    def setUp(self):
+        """Create a temporary directory and Python files for testing."""
+        self.temp_dir = tempfile.TemporaryDirectory()
+        self.test_file = Path(self.temp_dir.name) / "test_script.py"
+        self.test_file.write_text("""
+def foo():
+    raise ValueError("An error occurred")
+""")
+
+    def tearDown(self):
+        """Cleanup the temporary directory."""
+        self.temp_dir.cleanup()
+
+    def test_process_directory_report(self):
+        """Test processing a directory without modifying files."""
+        process_directory(self.temp_dir.name, modify=False)
+
+    def test_process_directory_update(self):
+        """Test modifying files to add exception docstrings."""
+        process_directory(self.temp_dir.name, modify=True)
+        content = self.test_file.read_text()
+        self.assertIn("Raises:", content)
+        self.assertIn("ValueError", content)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/src/auto_detect_exceptions/tests/test_detect_exceptions.py b/src/auto_detect_exceptions/tests/test_detect_exceptions.py
new file mode 100644
index 0000000..e98992e
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_detect_exceptions.py
@@ -0,0 +1,177 @@
+import pytest
+from typing import Any
+from ..detect import detect_function_exceptions
+from typing import Callable
+
+
+def func_value_error(x: Any) -> Any:
+    raise ValueError("An error occurred")
+
+
+def func_type_error(x: Any) -> Any:
+    raise TypeError("Another error occurred")
+
+
+def func_no_error() -> Any:
+    return "No error"
+
+
+def func_multiple_errors(x: Any) -> Any:
+    if x == 0:
+        raise ValueError("x cannot be zero")
+    elif x == 1:
+        raise TypeError("x must be an integer")
+    else:
+        raise RuntimeError("General error")
+
+
+def func_nested_errors(x: Any) -> Any:
+    try:
+        if x == 0:
+            raise ValueError("x cannot be zero")
+        elif x == 1:
+            raise TypeError("x must be an integer")
+    except ValueError:
+        raise KeyError("Caught a ValueError")
+    else:
+        if x == 2:
+            raise IndexError("x cannot be two")
+    finally:
+        print("Finally block executed")
+
+
+# Test case 6: Function with nested try-except
+def func_nested_try_except(x: Any) -> Any:
+    try:
+        try:
+            if x == 0:
+                raise ValueError("x cannot be zero")
+            elif x == 1:
+                raise TypeError("x must be an integer")
+        except ValueError:
+            raise KeyError("Caught a ValueError")
+    except KeyError:
+        raise IndexError("Caught a KeyError")
+
+
+# Test case 7: Function with no arguments but raises exceptions
+def func_with_no_arguments() -> Any:
+    raise AttributeError("Attribute error occurred")
+
+
+# Test case 8: Function with try, except, finally, else
+def func_with_try_except_finally_else(x: Any) -> Any:
+    try:
+        if x == 0:
+            raise ValueError("x cannot be zero")
+        elif x == 1:
+            raise TypeError("x must be an integer")
+    except ValueError:
+        raise KeyError("Caught a ValueError")
+    else:
+        if x == 2:
+            raise IndexError("x cannot be two")
+    finally:
+        print("Finally block executed")
+
+
+# Test case 9: Function with nested function calls that raise exceptions
+def func_with_nested_function_calls(x: Any) -> Any:
+    def nested_func(y: Any) -> Any:
+        if y == 0:
+            raise ValueError("y cannot be zero")
+        elif y == 1:
+            raise TypeError("y must be an integer")
+        else:
+            raise RuntimeError("General error in nested function")
+
+    nested_func(x)
+
+
+# Test case 10: Function with assert statement that raises AssertionError
+def func_with_assert_statement(x: Any) -> Any:
+    assert x > 0, "x must be greater than zero"
+
+
+# Test case 11: Function with recursive calls that raise exceptions
+def func_recursive(x: Any) -> Any:
+    if x == 0:
+        raise ValueError("x cannot be zero")
+    else:
+        func_recursive(x - 1)
+
+
+# Test case 12: except Parent Exception
+def func_except_parent_exception(x: Any) -> Any:
+    try:
+        if x == 0:
+            raise ValueError("x cannot be zero")
+        elif x == 1:
+            raise TypeError("x must be an integer")
+    except Exception:
+        raise KeyError("Caught a ValueError")
+
+
+# Test case 13: except parent exception with customize Exception
+def func_except_parent_exception_customize(x: Any) -> Any:
+    class SubValueError(ValueError): ...
+
+    try:
+        if x == 0:
+            raise SubValueError("x cannot be zero")
+        elif x == 1:
+            raise TypeError("x must be an integer")
+    except ValueError as e:
+        raise KeyError(f"Caught a ValueError {e}")
+
+
+# Test case 14: except Bare
+def func_except_bare(x: Any) -> Any:
+    try:
+        if x == 0:
+            raise ValueError("x cannot be zero")
+        elif x == 1:
+            raise TypeError("x must be an integer")
+    except:  # noqa: E722
+        raise KeyError("Caught a ValueError")
+
+
+# Test case 15: multiple except
+def func_multiple_except_blocks() -> None:
+    try:
+        print("In try block")
+        raise ValueError("Error in try block")  # Raises an exception
+    except ValueError:
+        print("In ValueError except block")
+        raise TypeError("Error in ValueError except block")  # Raises a new exception
+    except TypeError:
+        print("In TypeError except block")
+    except Exception:
+        print("In generic Exception except block")
+    finally:
+        print("In finally block")
+
+
+test_cases = [
+    (func_value_error, {"ValueError"}),
+    (func_type_error, {"TypeError"}),
+    (func_no_error, set()),
+    (func_multiple_errors, {"ValueError", "TypeError", "RuntimeError"}),
+    (func_nested_errors, {"KeyError", "TypeError", "IndexError"}),
+    (func_nested_try_except, {"KeyError", "IndexError"}),
+    (func_with_no_arguments, {"AttributeError"}),
+    (func_with_try_except_finally_else, {"KeyError", "TypeError", "IndexError"}),
+    (func_with_nested_function_calls, {"ValueError", "TypeError", "RuntimeError"}),
+    (func_with_assert_statement, {"AssertionError"}),
+    (func_recursive, {"ValueError"}),
+    (func_except_parent_exception, {"KeyError"}),
+    (func_except_parent_exception_customize, {"KeyError"}),
+    (func_except_bare, {"KeyError"}),
+    (func_multiple_except_blocks, {"ValueError", "TypeError"}),
+]
+
+
+@pytest.mark.parametrize("func,expected", test_cases)
+def test_func(func: Callable[..., Any], expected: set[str]) -> None:
+    result = detect_function_exceptions(f"{func.__module__}.{func.__name__}")
+    assert result == expected, f"Expected {expected}, got {result}"
diff --git a/src/auto_detect_exceptions/tests/test_docstring_utils.py b/src/auto_detect_exceptions/tests/test_docstring_utils.py
new file mode 100644
index 0000000..b3318b9
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_docstring_utils.py
@@ -0,0 +1,22 @@
+import unittest
+from ..docstring_utils import update_function_docstrings
+
+
+class TestDocstringUtils(unittest.TestCase):
+    def test_update_function_docstrings(self):
+        """Test modifying a function's docstring to include missing exceptions."""
+        source_code = '''
+def foo():
+    """This function does something."""
+    raise ValueError("Error occurred")
+'''
+
+        function_exceptions = {"foo": {"ValueError"}}
+        updated_code = update_function_docstrings(source_code, function_exceptions)
+
+        self.assertIn("Raises:", updated_code)
+        self.assertIn("ValueError", updated_code)
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/src/auto_detect_exceptions/tests/test_exception_analysis.py b/src/auto_detect_exceptions/tests/test_exception_analysis.py
new file mode 100644
index 0000000..714284a
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_exception_analysis.py
@@ -0,0 +1,68 @@
+import unittest
+import ast
+from ..ast_utils import parse_python_code, extract_functions
+from ..exception_analysis import (
+    get_unhandled_exceptions,
+    get_called_function_name,
+    resolve_exceptions_recursively,
+)
+
+
+class TestExceptionAnalysis(unittest.TestCase):
+    def setUp(self):
+        """Set up test source code."""
+        self.source_code = '''
+def foo():
+    """This function raises a ValueError."""
+    raise ValueError("An error occurred")
+
+def bar():
+    """This function calls foo(), propagating its exception."""
+    foo()
+
+def baz():
+    """This function has a try/except block, handling exceptions."""
+    try:
+        foo()
+    except ValueError:
+        pass
+
+def qux():
+    """This function calls an external function, which we ignore."""
+    print("Hello, World!")
+        '''
+        self.tree = parse_python_code(self.source_code)
+        self.functions = extract_functions(self.tree)
+
+    def test_get_unhandled_exceptions(self):
+        """Test detection of unhandled exceptions in function bodies."""
+        self.assertEqual(
+            get_unhandled_exceptions(self.functions["foo"], self.functions),
+            {"ValueError"},
+        )
+        self.assertEqual(
+            get_unhandled_exceptions(self.functions["baz"], self.functions), set()
+        )  # Exception is handled
+        self.assertEqual(
+            get_unhandled_exceptions(self.functions["qux"], self.functions), set()
+        )  # No exception
+
+    def test_get_called_function_name(self):
+        """Test extracting function names from function calls."""
+        bar_node = self.functions["bar"]
+        for child in ast.walk(bar_node):
+            if isinstance(child, ast.Call):
+                self.assertEqual(get_called_function_name(child), "foo")
+
+    def test_resolve_exceptions_recursively(self):
+        """Test recursive exception resolution across function calls."""
+        self.assertEqual(
+            resolve_exceptions_recursively("bar", self.functions), {"ValueError"}
+        )
+        self.assertEqual(
+            resolve_exceptions_recursively("baz", self.functions), set()
+        )  # Exception is handled
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/src/auto_detect_exceptions/tests/test_file_utils.py b/src/auto_detect_exceptions/tests/test_file_utils.py
new file mode 100644
index 0000000..f8a0f9a
--- /dev/null
+++ b/src/auto_detect_exceptions/tests/test_file_utils.py
@@ -0,0 +1,38 @@
+import unittest
+from pathlib import Path
+import tempfile
+from ..file_utils import find_python_files, read_python_file, write_python_file
+
+
+class TestFileUtils(unittest.TestCase):
+    def setUp(self):
+        """Set up a temporary directory with Python files for testing."""
+        self.temp_dir = tempfile.TemporaryDirectory()
+        self.test_file = Path(self.temp_dir.name) / "test_script.py"
+        self.test_file.write_text("print('Hello, World!')")
+
+    def tearDown(self):
+        """Clean up the temporary directory."""
+        self.temp_dir.cleanup()
+
+    def test_find_python_files(self):
+        """Test finding Python files in a directory."""
+        py_files = find_python_files(self.temp_dir.name)
+        self.assertEqual(len(py_files), 1)
+        self.assertEqual(py_files[0].name, "test_script.py")
+
+    def test_read_python_file(self):
+        """Test reading a Python file."""
+        content = read_python_file(self.test_file)
+        self.assertEqual(content.strip(), "print('Hello, World!')")
+
+    def test_write_python_file(self):
+        """Test writing to a Python file."""
+        new_content = "print('Updated Content!')"
+        write_python_file(self.test_file, new_content)
+        content = read_python_file(self.test_file)
+        self.assertEqual(content.strip(), new_content)
+
+
+if __name__ == "__main__":
+    unittest.main()