diff --git a/.gitignore b/.gitignore
index 61626e4..071f852 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,6 +49,7 @@ coverage.xml
 *.py,cover
 .hypothesis/
 .pytest_cache/
+.ruff_cache/
 cover/
 
 # Translations
diff --git a/README.md b/README.md
index 4d1bf48..e1fd4ee 100644
--- a/README.md
+++ b/README.md
@@ -2,11 +2,24 @@
 
 Paracelsus generates Entity Relationship Diagrams by reading your SQLAlchemy models.
 
-* ERDs can be injected into documentation as [Mermaid Diagrams](https://mermaid.js.org/).
-* Paracelsus can be run in CICD to check that databases are up to date.
-* ERDs can be created as files in either [Dot](https://graphviz.org/doc/info/lang.html) or Mermaid format.
-* DOT files can be used to generate SVG or PNG files, or edited in [GraphViz](https://graphviz.org/) or other editors.
-
+- [Paracelsus](#paracelsus)
+  - [Features](#features)
+  - [Usage](#usage)
+    - [Installation](#installation)
+    - [Basic CLI Usage](#basic-cli-usage)
+    - [Importing Models](#importing-models)
+    - [Generate Mermaid Diagrams](#generate-mermaid-diagrams)
+    - [Inject Mermaid Diagrams](#inject-mermaid-diagrams)
+    - [Creating Images](#creating-images)
+    - [pyproject.toml](#pyprojecttoml)
+  - [Sponsorship](#sponsorship)
+
+## Features
+
+- ERDs can be injected into documentation as [Mermaid Diagrams](https://mermaid.js.org/).
+- Paracelsus can be run in CICD to check that databases are up to date.
+- ERDs can be created as files in either [Dot](https://graphviz.org/doc/info/lang.html) or Mermaid format.
+- DOT files can be used to generate SVG or PNG files, or edited in [GraphViz](https://graphviz.org/) or other editors.
 
 ## Usage
 
@@ -29,9 +42,9 @@ paracelsus --help
 
 It has three commands:
 
-* `version` outputs the version of the currently installed `paracelsus` cli.
-* `graph` generates a graph and outputs it to `stdout`.
-* `inject` inserts the graph into a markdown file.
+- `version` outputs the version of the currently installed `paracelsus` cli.
+- `graph` generates a graph and outputs it to `stdout`.
+- `inject` inserts the graph into a markdown file.
 
 ### Importing Models
 
@@ -161,6 +174,18 @@ To create a PNG file:
 ![Alt text](./docs/example.png "a title")
 
 
+### pyproject.toml
+
+The settings for your project can be saved directly in the `pyprojects.toml` file of your project.
+
+```toml
+[tool.paracelsus]
+base = "example.base:Base"
+imports = [
+  "example.models"
+]
+```
+
 ## Sponsorship
 
 This project is developed by [Robert Hafner](https://blog.tedivm.com) If you find this project useful please consider sponsoring me using Github!
diff --git a/paracelsus/cli.py b/paracelsus/cli.py
index 115083a..0cd423e 100644
--- a/paracelsus/cli.py
+++ b/paracelsus/cli.py
@@ -1,26 +1,17 @@
-import importlib
-import os
 import re
 import sys
 from enum import Enum
 from pathlib import Path
-from typing import List
+from typing import Any, Dict, List, Optional
 
 import typer
 from typing_extensions import Annotated
 
-from .transformers.dot import Dot
-from .transformers.mermaid import Mermaid
+from .graph import get_graph_string, transformers
+from .pyproject import get_pyproject_settings
 
 app = typer.Typer()
 
-transformers = {
-    "mmd": Mermaid,
-    "mermaid": Mermaid,
-    "dot": Dot,
-    "gv": Dot,
-}
-
 
 class Formats(str, Enum):
     mermaid = "mermaid"
@@ -29,49 +20,22 @@ class Formats(str, Enum):
     gv = "gv"
 
 
-def get_graph_string(
-    base_class_path: str,
-    import_module: List[str],
-    python_dir: List[Path],
-    format: str,
-) -> str:
-    # Update the PYTHON_PATH to allow more module imports.
-    sys.path.append(str(os.getcwd()))
-    for dir in python_dir:
-        sys.path.append(str(dir))
-
-    # Import the base class so the metadata class can be extracted from it.
-    # The metadata class is passed to the transformer.
-    module_path, class_name = base_class_path.split(":", 2)
-    base_module = importlib.import_module(module_path)
-    base_class = getattr(base_module, class_name)
-    metadata = base_class.metadata
-
-    # The modules holding the model classes have to be imported to get put in the metaclass model registry.
-    # These modules aren't actually used in any way, so they are discarded.
-    # They are also imported in scope of this function to prevent namespace pollution.
-    for module in import_module:
-        if ":*" in module:
-            # Sure, execs are gross, but this is the only way to dynamically import wildcards.
-            exec(f"from {module[:-2]} import *")
-        else:
-            importlib.import_module(module)
-
-    # Grab a transformer.
-    if format not in transformers:
-        raise ValueError(f"Unknown Format: {format}")
-    transformer = transformers[format]
-
-    # Save the graph structure to string.
-    return str(transformer(metadata))
+def get_base_class(base_class_path: str | None, settings=Dict[str, Any] | None) -> str:
+    if base_class_path:
+        return base_class_path
+    if not settings:
+        raise ValueError("`base_class_path` argument must be passed if no pyproject.toml file is present.")
+    if "base" not in settings:
+        raise ValueError("`base_class_path` argument must be passed if not defined in pyproject.toml.")
+    return settings["base"]
 
 
 @app.command(help="Create the graph structure and print it to stdout.")
 def graph(
     base_class_path: Annotated[
-        str,
+        Optional[str],
         typer.Argument(help="The SQLAlchemy base class used by the database to graph."),
-    ],
+    ] = None,
     import_module: Annotated[
         List[str],
         typer.Option(
@@ -92,9 +56,15 @@ def graph(
         Formats, typer.Option(help="The file format to output the generated graph to.")
     ] = Formats.mermaid,
 ):
+    settings = get_pyproject_settings()
+    base_class = get_base_class(base_class_path, settings)
+
+    if settings and "imports" in settings:
+        import_module.extend(settings["imports"])
+
     typer.echo(
         get_graph_string(
-            base_class_path=base_class_path,
+            base_class_path=base_class,
             import_module=import_module,
             python_dir=python_dir,
             format=format.value,
diff --git a/paracelsus/graph.py b/paracelsus/graph.py
new file mode 100644
index 0000000..88cae36
--- /dev/null
+++ b/paracelsus/graph.py
@@ -0,0 +1,52 @@
+import importlib
+import os
+import sys
+from pathlib import Path
+from typing import List
+
+from .transformers.dot import Dot
+from .transformers.mermaid import Mermaid
+
+transformers = {
+    "mmd": Mermaid,
+    "mermaid": Mermaid,
+    "dot": Dot,
+    "gv": Dot,
+}
+
+
+def get_graph_string(
+    base_class_path: str,
+    import_module: List[str],
+    python_dir: List[Path],
+    format: str,
+) -> str:
+    # Update the PYTHON_PATH to allow more module imports.
+    sys.path.append(str(os.getcwd()))
+    for dir in python_dir:
+        sys.path.append(str(dir))
+
+    # Import the base class so the metadata class can be extracted from it.
+    # The metadata class is passed to the transformer.
+    module_path, class_name = base_class_path.split(":", 2)
+    base_module = importlib.import_module(module_path)
+    base_class = getattr(base_module, class_name)
+    metadata = base_class.metadata
+
+    # The modules holding the model classes have to be imported to get put in the metaclass model registry.
+    # These modules aren't actually used in any way, so they are discarded.
+    # They are also imported in scope of this function to prevent namespace pollution.
+    for module in import_module:
+        if ":*" in module:
+            # Sure, execs are gross, but this is the only way to dynamically import wildcards.
+            exec(f"from {module[:-2]} import *")
+        else:
+            importlib.import_module(module)
+
+    # Grab a transformer.
+    if format not in transformers:
+        raise ValueError(f"Unknown Format: {format}")
+    transformer = transformers[format]
+
+    # Save the graph structure to string.
+    return str(transformer(metadata))
diff --git a/paracelsus/pyproject.py b/paracelsus/pyproject.py
new file mode 100644
index 0000000..7bd81c6
--- /dev/null
+++ b/paracelsus/pyproject.py
@@ -0,0 +1,16 @@
+import os
+import tomllib
+from pathlib import Path
+from typing import Any, Dict
+
+
+def get_pyproject_settings(dir: Path = Path(os.getcwd())) -> Dict[str, Any] | None:
+    pyproject = dir / "pyproject.toml"
+
+    if not pyproject.exists():
+        return None
+
+    with open(pyproject, "rb") as f:
+        data = tomllib.load(f)
+
+    return data.get("tool", {}).get("paracelsus", None)
diff --git a/tests/assets/README.md b/tests/assets/README.md
new file mode 100644
index 0000000..ad2c459
--- /dev/null
+++ b/tests/assets/README.md
@@ -0,0 +1,8 @@
+# Test Directory
+
+Please ignore.
+
+## Schema
+
+<!-- BEGIN_SQLALCHEMY_DOCS -->
+<!-- END_SQLALCHEMY_DOCS -->
diff --git a/tests/assets/example/__init__.py b/tests/assets/example/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/assets/example/base.py b/tests/assets/example/base.py
new file mode 100644
index 0000000..59be703
--- /dev/null
+++ b/tests/assets/example/base.py
@@ -0,0 +1,3 @@
+from sqlalchemy.orm import declarative_base
+
+Base = declarative_base()
diff --git a/tests/assets/example/models.py b/tests/assets/example/models.py
new file mode 100644
index 0000000..47c17d1
--- /dev/null
+++ b/tests/assets/example/models.py
@@ -0,0 +1,37 @@
+from datetime import UTC, datetime
+from uuid import uuid4
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, Uuid
+from sqlalchemy.orm import mapped_column
+
+from .base import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = mapped_column(Uuid, primary_key=True, default=uuid4())
+    display_name = mapped_column(String(100))
+    created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
+
+
+class Post(Base):
+    __tablename__ = "posts"
+
+    id = mapped_column(Uuid, primary_key=True, default=uuid4())
+    author = mapped_column(ForeignKey(User.id), nullable=False)
+    created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
+    live = mapped_column(Boolean, default=False)
+    content = mapped_column(Text, default="")
+
+
+class Comment(Base):
+    __tablename__ = "comments"
+
+    id = mapped_column(Uuid, primary_key=True, default=uuid4())
+    post = mapped_column(Uuid, ForeignKey(Post.id), default=uuid4())
+    author = mapped_column(ForeignKey(User.id), nullable=False)
+    created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
+    live = mapped_column(Boolean, default=False)
+    content = mapped_column(Text, default="")
+    content = mapped_column(Text, default="")
diff --git a/tests/assets/pyproject.toml b/tests/assets/pyproject.toml
new file mode 100644
index 0000000..53cd70b
--- /dev/null
+++ b/tests/assets/pyproject.toml
@@ -0,0 +1,5 @@
+[tool.paracelsus]
+base = "example.base:Base"
+imports = [
+  "example.models"
+]
diff --git a/tests/conftest.py b/tests/conftest.py
index 5430302..216493e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,4 +1,6 @@
-from datetime import datetime
+import os
+from datetime import UTC, datetime
+from pathlib import Path
 from uuid import uuid4
 
 import pytest
@@ -15,14 +17,14 @@ class User(Base):
 
         id = mapped_column(Uuid, primary_key=True, default=uuid4())
         display_name = mapped_column(String(100))
-        created = mapped_column(DateTime, nullable=False, default=datetime.utcnow())
+        created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
 
     class Post(Base):
         __tablename__ = "posts"
 
         id = mapped_column(Uuid, primary_key=True, default=uuid4())
         author = mapped_column(ForeignKey(User.id), nullable=False)
-        created = mapped_column(DateTime, nullable=False, default=datetime.utcnow())
+        created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
         live = mapped_column(Boolean, default=False, comment="True if post is published")
         content = mapped_column(Text, default="")
 
@@ -32,8 +34,13 @@ class Comment(Base):
         id = mapped_column(Uuid, primary_key=True, default=uuid4())
         post = mapped_column(Uuid, ForeignKey(Post.id), default=uuid4())
         author = mapped_column(ForeignKey(User.id), nullable=False)
-        created = mapped_column(DateTime, nullable=False, default=datetime.utcnow())
+        created = mapped_column(DateTime, nullable=False, default=datetime.now(UTC))
         live = mapped_column(Boolean, default=False)
         content = mapped_column(Text, default="")
 
     return Base.metadata
+
+
+@pytest.fixture
+def package_path():
+    return Path(os.path.dirname(os.path.realpath(__file__))) / "assets"
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..f51ef0a
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,49 @@
+from typer.testing import CliRunner
+
+from paracelsus.cli import app
+
+runner = CliRunner()
+
+
+def test_graph(package_path):
+    result = runner.invoke(
+        app, ["graph", "example.base:Base", "--import-module", "example.models", "--python-dir", str(package_path)]
+    )
+
+    assert result.exit_code == 0
+
+    assert "users {" in result.stdout
+    assert "posts {" in result.stdout
+    assert "comments {" in result.stdout
+
+    assert "users ||--o{ posts : author" in result.stdout
+    assert "posts ||--o{ comments : post" in result.stdout
+    assert "users ||--o{ comments : author" in result.stdout
+
+    assert "CHAR(32) author FK" in result.stdout
+    assert 'CHAR(32) post FK "nullable"' in result.stdout
+    assert "DATETIME created" in result.stdout
+
+
+def test_inject(package_path):
+    result = runner.invoke(
+        app,
+        [
+            "inject",
+            str(package_path / "README.md"),
+            "example.base:Base",
+            "--import-module",
+            "example.models",
+            "--python-dir",
+            str(package_path),
+            "--check",
+        ],
+    )
+
+    assert result.exit_code == 1
+
+
+def test_version():
+    result = runner.invoke(app, ["version"])
+
+    assert result.exit_code == 0
diff --git a/tests/test_graph.py b/tests/test_graph.py
new file mode 100644
index 0000000..f588ad0
--- /dev/null
+++ b/tests/test_graph.py
@@ -0,0 +1,17 @@
+from paracelsus.graph import get_graph_string
+
+
+def test_get_graph_string(package_path):
+    graph_string = get_graph_string("example.base:Base", ["example.models"], [package_path], "mermaid")
+
+    assert "users {" in graph_string
+    assert "posts {" in graph_string
+    assert "comments {" in graph_string
+
+    assert "users ||--o{ posts : author" in graph_string
+    assert "posts ||--o{ comments : post" in graph_string
+    assert "users ||--o{ comments : author" in graph_string
+
+    assert "CHAR(32) author FK" in graph_string
+    assert 'CHAR(32) post FK "nullable"' in graph_string
+    assert "DATETIME created" in graph_string
diff --git a/tests/test_pyproject.py b/tests/test_pyproject.py
new file mode 100644
index 0000000..4a6a223
--- /dev/null
+++ b/tests/test_pyproject.py
@@ -0,0 +1,14 @@
+from paracelsus.pyproject import get_pyproject_settings
+
+
+def test_pyproject(package_path):
+    settings = get_pyproject_settings(package_path)
+    assert "base" in settings
+    assert "imports" in settings
+    assert settings["base"] == "example.base:Base"
+    assert "example.models" in settings["imports"]
+
+
+def test_pyproject_none():
+    settings = get_pyproject_settings()
+    assert settings is None