diff --git a/.chronus/changes/link_emitters-2024-4-13-14-39-2.md b/.chronus/changes/link_emitters-2024-4-13-14-39-2.md
new file mode 100644
index 00000000000..91280ecdf58
--- /dev/null
+++ b/.chronus/changes/link_emitters-2024-4-13-14-39-2.md
@@ -0,0 +1,8 @@
+---
+changeKind: feature
+packages:
+  - "@autorest/python"
+  - "@azure-tools/typespec-python"
+---
+
+add package pygen that both autorest.python and typespec-python will rely on
diff --git a/.gitignore b/.gitignore
index 5fbc2245061..2bbf0a3b855 100644
--- a/.gitignore
+++ b/.gitignore
@@ -125,3 +125,4 @@ node_modules/
 
 # Generated test folders
 test/services/*/_generated
+**/autorest.python/generator
diff --git a/eng/pipelines/ci-template.yml b/eng/pipelines/ci-template.yml
index 28de9e9bb5a..5cca332de3c 100644
--- a/eng/pipelines/ci-template.yml
+++ b/eng/pipelines/ci-template.yml
@@ -69,10 +69,18 @@ steps:
       displayName: Build project
       workingDirectory: $(Build.SourcesDirectory)/autorest.python/
 
+    - script: pip list
+      displayName: List installed packages
+      workingDirectory: $(Build.SourcesDirectory)/autorest.python/packages/${{parameters.folderName}}
+
     - script: pip install -r dev_requirements.txt
       displayName: Pip install dev requirements
       workingDirectory: $(Build.SourcesDirectory)/autorest.python/packages/${{parameters.folderName}}
 
+    - script: pip list
+      displayName: List installed packages
+      workingDirectory: $(Build.SourcesDirectory)/autorest.python/packages/${{parameters.folderName}}
+
     - script: pylint ${{parameters.pythonFolderName}}
       displayName: Pylint
       workingDirectory: $(Build.SourcesDirectory)/autorest.python/packages/${{parameters.folderName}}
diff --git a/packages/autorest.python/autorest/__init__.py b/packages/autorest.python/autorest/__init__.py
index 1fa6e0b83c8..e5682d9aad0 100644
--- a/packages/autorest.python/autorest/__init__.py
+++ b/packages/autorest.python/autorest/__init__.py
@@ -5,59 +5,18 @@
 # --------------------------------------------------------------------------
 import logging
 from pathlib import Path
-import json
-from abc import ABC, abstractmethod
+from abc import abstractmethod
 from typing import Any, Dict, Union, List
 
 import yaml
 
+from pygen import ReaderAndWriter, Plugin, YamlUpdatePlugin
 from .jsonrpc import AutorestAPI
-from ._version import VERSION
 
 
-__version__ = VERSION
 _LOGGER = logging.getLogger(__name__)
 
 
-class ReaderAndWriter:
-    def __init__(self, *, output_folder: Union[str, Path], **kwargs: Any) -> None:
-        self.output_folder = Path(output_folder)
-        self._list_file: List[str] = []
-        try:
-            with open(
-                Path(self.output_folder) / Path("..") / Path("python.json"),
-                "r",
-                encoding="utf-8-sig",
-            ) as fd:
-                python_json = json.load(fd)
-        except Exception:  # pylint: disable=broad-except
-            python_json = {}
-        self.options = kwargs
-        if python_json:
-            _LOGGER.warning("Loading python.json file. This behavior will be depreacted")
-        self.options.update(python_json)
-
-    def read_file(self, path: Union[str, Path]) -> str:
-        """Directly reading from disk"""
-        # make path relative to output folder
-        try:
-            with open(self.output_folder / Path(path), "r", encoding="utf-8-sig") as fd:
-                return fd.read()
-        except FileNotFoundError:
-            return ""
-
-    def write_file(self, filename: Union[str, Path], file_content: str) -> None:
-        """Directly writing to disk"""
-        file_folder = Path(filename).parent
-        if not Path.is_dir(self.output_folder / file_folder):
-            Path.mkdir(self.output_folder / file_folder, parents=True)
-        with open(self.output_folder / Path(filename), "w", encoding="utf-8") as fd:
-            fd.write(file_content)
-
-    def list_file(self) -> List[str]:
-        return [str(f) for f in self.output_folder.glob("**/*") if f.is_file()]
-
-
 class ReaderAndWriterAutorest(ReaderAndWriter):
     def __init__(self, *, output_folder: Union[str, Path], autorestapi: AutorestAPI) -> None:
         super().__init__(output_folder=output_folder)
@@ -73,23 +32,6 @@ def list_file(self) -> List[str]:
         return self._autorestapi.list_inputs()
 
 
-class Plugin(ReaderAndWriter, ABC):
-    """A base class for autorest plugin.
-
-    :param autorestapi: An autorest API instance
-    """
-
-    @abstractmethod
-    def process(self) -> bool:
-        """The plugin process.
-
-        :rtype: bool
-        :returns: True if everything's ok, False optherwise
-        :raises Exception: Could raise any exception, stacktrace will be sent to autorest API
-        """
-        raise NotImplementedError()
-
-
 class PluginAutorest(Plugin, ReaderAndWriterAutorest):
     """For our Autorest plugins, we want to take autorest api as input as options, then pass it to the Plugin"""
 
@@ -102,39 +44,6 @@ def get_options(self) -> Dict[str, Any]:
         """Get the options bag using the AutorestAPI that we send to the parent plugin"""
 
 
-class YamlUpdatePlugin(Plugin):
-    """A plugin that update the YAML as input."""
-
-    def get_yaml(self) -> Dict[str, Any]:
-        # cadl file doesn't have to be relative to output folder
-        with open(self.options["cadl_file"], "r", encoding="utf-8-sig") as fd:
-            return yaml.safe_load(fd.read())
-
-    def write_yaml(self, yaml_string: str) -> None:
-        with open(self.options["cadl_file"], "w", encoding="utf-8-sig") as fd:
-            fd.write(yaml_string)
-
-    def process(self) -> bool:
-        # List the input file, should be only one
-        yaml_data = self.get_yaml()
-
-        self.update_yaml(yaml_data)
-
-        yaml_string = yaml.safe_dump(yaml_data)
-
-        self.write_yaml(yaml_string)
-        return True
-
-    @abstractmethod
-    def update_yaml(self, yaml_data: Dict[str, Any]) -> None:
-        """The code-model-v4-no-tags yaml model tree.
-
-        :rtype: updated yaml
-        :raises Exception: Could raise any exception, stacktrace will be sent to autorest API
-        """
-        raise NotImplementedError()
-
-
 class YamlUpdatePluginAutorest(YamlUpdatePlugin, PluginAutorest):  # pylint: disable=abstract-method
     def get_yaml(self) -> Dict[str, Any]:
         return yaml.safe_load(self.read_file("code-model-v4-no-tags.yaml"))
diff --git a/packages/autorest.python/autorest/black.py b/packages/autorest.python/autorest/black.py
new file mode 100644
index 00000000000..c77cfcf0513
--- /dev/null
+++ b/packages/autorest.python/autorest/black.py
@@ -0,0 +1,13 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+from typing import Dict, Any
+from pygen.black import BlackScriptPlugin
+from . import PluginAutorest
+
+
+class BlackScriptPluginAutorest(BlackScriptPlugin, PluginAutorest):
+    def get_options(self) -> Dict[str, Any]:
+        return {"output_folder": self._autorestapi.get_value("outputFolderUri")}
diff --git a/packages/autorest.python/autorest/codegen.py b/packages/autorest.python/autorest/codegen.py
new file mode 100644
index 00000000000..3240f7e7d49
--- /dev/null
+++ b/packages/autorest.python/autorest/codegen.py
@@ -0,0 +1,117 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import logging
+from typing import Dict, Any, Union
+from pathlib import Path
+import yaml
+
+from pygen.codegen import CodeGenerator
+from pygen.codegen.models import CodeModel
+from pygen.codegen.serializers import JinjaSerializer
+
+from . import ReaderAndWriterAutorest
+from .jsonrpc import AutorestAPI
+from . import PluginAutorest
+
+
+_LOGGER = logging.getLogger(__name__)
+
+
+class JinjaSerializerAutorest(JinjaSerializer, ReaderAndWriterAutorest):
+    def __init__(
+        self,
+        autorestapi: AutorestAPI,
+        code_model: CodeModel,
+        *,
+        output_folder: Union[str, Path],
+        **kwargs: Any,
+    ) -> None:
+        super().__init__(  # type: ignore
+            autorestapi=autorestapi,
+            code_model=code_model,
+            output_folder=output_folder,
+            **kwargs,
+        )
+
+
+class CodeGeneratorAutorest(CodeGenerator, PluginAutorest):
+    def get_options(self) -> Dict[str, Any]:
+        if self._autorestapi.get_boolean_value("python3-only") is False:
+            _LOGGER.warning("You have passed in --python3-only=False. We have force overriden this to True.")
+        if self._autorestapi.get_boolean_value("add-python3-operation-files"):
+            _LOGGER.warning(
+                "You have passed in --add-python3-operation-files. "
+                "This flag no longer has an effect bc all SDKs are now Python3 only."
+            )
+        if self._autorestapi.get_boolean_value("reformat-next-link"):
+            _LOGGER.warning(
+                "You have passed in --reformat-next-link. We have force overriden "
+                "this to False because we no longer reformat initial query parameters into next "
+                "calls unless explicitly defined in the service definition."
+            )
+        options = {
+            "azure-arm": self._autorestapi.get_boolean_value("azure-arm"),
+            "header-text": self._autorestapi.get_value("header-text"),
+            "low-level-client": self._autorestapi.get_boolean_value("low-level-client", False),
+            "version-tolerant": self._autorestapi.get_boolean_value("version-tolerant", True),
+            "show-operations": self._autorestapi.get_boolean_value("show-operations"),
+            "python3-only": self._autorestapi.get_boolean_value("python3-only"),
+            "head-as-boolean": self._autorestapi.get_boolean_value("head-as-boolean", False),
+            "keep-version-file": self._autorestapi.get_boolean_value("keep-version-file"),
+            "no-async": self._autorestapi.get_boolean_value("no-async"),
+            "no-namespace-folders": self._autorestapi.get_boolean_value("no-namespace-folders"),
+            "basic-setup-py": self._autorestapi.get_boolean_value("basic-setup-py"),
+            "package-name": self._autorestapi.get_value("package-name"),
+            "package-version": self._autorestapi.get_value("package-version"),
+            "client-side-validation": self._autorestapi.get_boolean_value("client-side-validation"),
+            "tracing": self._autorestapi.get_boolean_value("trace"),
+            "multiapi": self._autorestapi.get_boolean_value("multiapi", False),
+            "polymorphic-examples": self._autorestapi.get_value("polymorphic-examples"),
+            "models-mode": self._autorestapi.get_value("models-mode"),
+            "builders-visibility": self._autorestapi.get_value("builders-visibility"),
+            "show-send-request": self._autorestapi.get_boolean_value("show-send-request"),
+            "only-path-and-body-params-positional": self._autorestapi.get_boolean_value(
+                "only-path-and-body-params-positional"
+            ),
+            "combine-operation-files": self._autorestapi.get_boolean_value("combine-operation-files"),
+            "package-mode": self._autorestapi.get_value("package-mode"),
+            "package-pprint-name": self._autorestapi.get_value("package-pprint-name"),
+            "packaging-files-config": self._autorestapi.get_value("package-configuration"),
+            "default-optional-constants-to-none": self._autorestapi.get_boolean_value(
+                "default-optional-constants-to-none"
+            ),
+            "generate-sample": self._autorestapi.get_boolean_value("generate-sample"),
+            "generate-test": self._autorestapi.get_boolean_value("generate-test"),
+            "default-api-version": self._autorestapi.get_value("default-api-version"),
+        }
+        return {k: v for k, v in options.items() if v is not None}
+
+    def get_yaml(self) -> Dict[str, Any]:
+        inputs = self._autorestapi.list_inputs()
+        _LOGGER.debug("Possible Inputs: %s", inputs)
+        if "code-model-v4-no-tags.yaml" not in inputs:
+            raise ValueError("code-model-v4-no-tags.yaml must be a possible input")
+
+        if self._autorestapi.get_value("input-yaml"):
+            input_yaml = self._autorestapi.get_value("input-yaml")
+            file_content = self._autorestapi.read_file(input_yaml)
+        else:
+            inputs = self._autorestapi.list_inputs()
+            _LOGGER.debug("Possible Inputs: %s", inputs)
+            if "code-model-v4-no-tags.yaml" not in inputs:
+                raise ValueError("code-model-v4-no-tags.yaml must be a possible input")
+
+            file_content = self._autorestapi.read_file("code-model-v4-no-tags.yaml")
+
+        # Parse the received YAML
+        return yaml.safe_load(file_content)
+
+    def get_serializer(self, code_model: CodeModel):
+        return JinjaSerializerAutorest(
+            self._autorestapi,
+            code_model,
+            output_folder=self.output_folder,
+        )
diff --git a/packages/autorest.python/autorest/m2r.py b/packages/autorest.python/autorest/m2r.py
new file mode 100644
index 00000000000..418a9ca2899
--- /dev/null
+++ b/packages/autorest.python/autorest/m2r.py
@@ -0,0 +1,16 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+"""An autorest MD to RST plugin.
+"""
+from typing import Any, Dict
+
+from pygen.m2r import M2R
+from . import YamlUpdatePluginAutorest
+
+
+class M2RAutorest(YamlUpdatePluginAutorest, M2R):
+    def get_options(self) -> Dict[str, Any]:
+        return {}
diff --git a/packages/autorest.python/autorest/m4reformatter/__init__.py b/packages/autorest.python/autorest/m4reformatter/__init__.py
index 9ae4a5cd4d8..1d0423058ca 100644
--- a/packages/autorest.python/autorest/m4reformatter/__init__.py
+++ b/packages/autorest.python/autorest/m4reformatter/__init__.py
@@ -11,7 +11,7 @@
 import logging
 from typing import Callable, Dict, Any, Iterable, List, Optional, Set
 
-from .._utils import (
+from pygen.utils import (
     to_snake_case,
     KNOWN_TYPES,
     get_body_type_for_description,
diff --git a/packages/autorest.python/autorest/multiapi/__init__.py b/packages/autorest.python/autorest/multiapi/__init__.py
index 4b321cc8d97..c1df35c21cf 100644
--- a/packages/autorest.python/autorest/multiapi/__init__.py
+++ b/packages/autorest.python/autorest/multiapi/__init__.py
@@ -10,12 +10,13 @@
 from collections import defaultdict
 from pathlib import Path
 from typing import Dict, List, Optional, cast, Any
+from pygen import Plugin, ReaderAndWriter
 
 from .serializers import MultiAPISerializer, MultiAPISerializerAutorest
 from .models import CodeModel
 from .utils import _get_default_api_version_from_list
 
-from .. import Plugin, PluginAutorest, ReaderAndWriter, ReaderAndWriterAutorest
+from .. import PluginAutorest, ReaderAndWriterAutorest
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/packages/autorest.python/autorest/multiapi/serializers/__init__.py b/packages/autorest.python/autorest/multiapi/serializers/__init__.py
index 99c2be1547d..9f197a7e2e0 100644
--- a/packages/autorest.python/autorest/multiapi/serializers/__init__.py
+++ b/packages/autorest.python/autorest/multiapi/serializers/__init__.py
@@ -6,13 +6,15 @@
 from pathlib import Path
 from typing import Any, Optional, Union, List
 from jinja2 import PackageLoader, Environment
+from pygen import ReaderAndWriter
+from pygen.utils import build_policies
 
 from .import_serializer import FileImportSerializer
 
 from ...jsonrpc import AutorestAPI
 from ..models import CodeModel, GlobalParameter
-from ... import ReaderAndWriter, ReaderAndWriterAutorest
-from ..._utils import build_policies
+from ... import ReaderAndWriterAutorest
+
 
 __all__ = [
     "MultiAPISerializer",
@@ -123,7 +125,7 @@ def serialize(self, code_model: CodeModel, no_async: Optional[bool]) -> None:
 
         if not code_model.client.client_side_validation:
             codegen_env = Environment(
-                loader=PackageLoader("autorest.codegen", "templates"),
+                loader=PackageLoader("pygen.codegen", "templates"),
                 keep_trailing_newline=True,
                 line_statement_prefix="##",
                 line_comment_prefix="###",
diff --git a/packages/autorest.python/autorest/multiclient/__init__.py b/packages/autorest.python/autorest/multiclient/__init__.py
index 3d397f6b086..f0e0c32bba9 100644
--- a/packages/autorest.python/autorest/multiclient/__init__.py
+++ b/packages/autorest.python/autorest/multiclient/__init__.py
@@ -7,7 +7,8 @@
 from typing import Any, Dict
 from pathlib import Path
 from jinja2 import Environment, PackageLoader
-from .. import Plugin, PluginAutorest
+from pygen import Plugin
+from .. import PluginAutorest
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/packages/autorest.python/autorest/postprocess.py b/packages/autorest.python/autorest/postprocess.py
new file mode 100644
index 00000000000..5aa9f951de3
--- /dev/null
+++ b/packages/autorest.python/autorest/postprocess.py
@@ -0,0 +1,14 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+from typing import Any, Dict
+
+from pygen.postprocess import PostProcessPlugin
+from . import PluginAutorest
+
+
+class PostProcessPluginAutorest(PostProcessPlugin, PluginAutorest):
+    def get_options(self) -> Dict[str, Any]:
+        return {"outputFolderUri": self._autorestapi.get_value("outputFolderUri")}
diff --git a/packages/autorest.python/autorest/preprocess.py b/packages/autorest.python/autorest/preprocess.py
new file mode 100644
index 00000000000..ebe66c56e3e
--- /dev/null
+++ b/packages/autorest.python/autorest/preprocess.py
@@ -0,0 +1,20 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+"""The preprocessing autorest plugin.
+"""
+from typing import Dict, Any
+from pygen.preprocess import PreProcessPlugin
+from . import YamlUpdatePluginAutorest
+
+
+class PreProcessPluginAutorest(YamlUpdatePluginAutorest, PreProcessPlugin):
+    def get_options(self) -> Dict[str, Any]:
+        options = {
+            "version-tolerant": self._autorestapi.get_boolean_value("version-tolerant"),
+            "azure-arm": self._autorestapi.get_boolean_value("azure-arm"),
+            "models-mode": self._autorestapi.get_value("models-mode"),
+        }
+        return {k: v for k, v in options.items() if v is not None}
diff --git a/packages/autorest.python/dev_requirements.txt b/packages/autorest.python/dev_requirements.txt
index d458756b7d8..0ac67bacc8a 100644
--- a/packages/autorest.python/dev_requirements.txt
+++ b/packages/autorest.python/dev_requirements.txt
@@ -1,4 +1,5 @@
 -e .
+-e ./generator
 -r ../../eng/requirements.txt
 -r ../../eng/dev_requirements.txt
 ptvsd==4.3.2
diff --git a/packages/autorest.python/mypy.ini b/packages/autorest.python/mypy.ini
index 611cc27aa2a..7fbbd82b849 100644
--- a/packages/autorest.python/mypy.ini
+++ b/packages/autorest.python/mypy.ini
@@ -22,7 +22,7 @@ ignore_missing_imports = True
 [mypy-autorest.common.python_mappings.*]
 ignore_missing_imports = True
 
-[mypy-autorest.codegen.models.*]
+[mypy-pygen.codegen.models.*]
 ignore_missing_imports = True
 
 [mypy-setuptools]
@@ -30,3 +30,6 @@ ignore_missing_imports = True
 
 [mypy-*._patch]
 ignore_missing_imports = True
+
+[mypy-pygen.*]
+ignore_missing_imports = True
diff --git a/packages/autorest.python/package.json b/packages/autorest.python/package.json
index 055443acf8b..1ddb7fbe15f 100644
--- a/packages/autorest.python/package.json
+++ b/packages/autorest.python/package.json
@@ -3,10 +3,11 @@
   "version": "6.14.3",
   "description": "The Python extension for generators in AutoRest.",
   "scripts": {
-    "prepare": "node run-python3.js prepare.py",
-    "start": "node run-python3.js start.py",
-    "install": "node run-python3.js install.py",
-    "debug": "node run-python3.js start.py --debug"
+    "start": "node ./scripts/run-python3.js ./scripts/start.py",
+    "prepare": "node ./scripts/run-python3.js ./scripts/prepare.py",
+    "build": "node ./scripts/copy-generator.js --force",
+    "install": "node ./scripts/copy-generator.js && node ./scripts/run-python3.js ./scripts/install.py",
+    "debug": "node ./scripts/run-python3.js ./scripts/start.py --debug"
   },
   "main": "index.js",
   "repository": {
@@ -25,22 +26,20 @@
   },
   "homepage": "https://github.com/Azure/autorest.python/blob/main/README.md",
   "dependencies": {
-    "@autorest/system-requirements": "~1.0.2"
+    "@autorest/system-requirements": "~1.0.2",
+    "fs-extra": "~11.2.0"
   },
   "devDependencies": {
     "@microsoft.azure/autorest.testserver": "^3.3.46",
-    "typescript": "~5.1.3"
+    "typescript": "~5.1.3",
+    "@azure-tools/typespec-python": "workspace:^"
   },
   "files": [
     "autorest/**/*.py",
     "autorest/**/*.jinja2",
+    "scripts/",
     "setup.py",
-    "install.py",
-    "prepare.py",
-    "start.py",
-    "venvtools.py",
-    "run-python3.js",
     "requirements.txt",
-    "run_cadl.py"
+    "generator/"
   ]
 }
diff --git a/packages/autorest.python/requirements.txt b/packages/autorest.python/requirements.txt
index 17ae43bada8..3f977ca26b8 100644
--- a/packages/autorest.python/requirements.txt
+++ b/packages/autorest.python/requirements.txt
@@ -2,7 +2,6 @@ black==24.4.0
 click==8.1.3
 docutils==0.19
 Jinja2==3.1.4
-json-rpc==1.14.0
 m2r2==0.3.3
 MarkupSafe==2.1.2
 mistune==0.8.4
@@ -11,3 +10,4 @@ platformdirs==3.2.0
 PyYAML==6.0.1
 tomli==2.0.1
 setuptools==69.2.0
+json-rpc==1.14.0
diff --git a/packages/autorest.python/run-python3.js b/packages/autorest.python/run-python3.js
index 020cbce0a0f..70ec3bc1e6e 100644
--- a/packages/autorest.python/run-python3.js
+++ b/packages/autorest.python/run-python3.js
@@ -4,7 +4,7 @@
 // path resolution algorithm as AutoRest so that the behavior
 // is fully consistent (and also supports AUTOREST_PYTHON_EXE).
 //
-// Invoke it like so: "node run-python3.js script.py"
+// Invoke it like so: "node run-python3.cjs script.py"
 
 const cp = require("child_process");
 const extension = require("@autorest/system-requirements");
diff --git a/packages/autorest.python/scripts/copy-generator.js b/packages/autorest.python/scripts/copy-generator.js
new file mode 100644
index 00000000000..c85af504e10
--- /dev/null
+++ b/packages/autorest.python/scripts/copy-generator.js
@@ -0,0 +1,19 @@
+const fs = require("fs-extra");
+const path = require("path");
+
+const force = process.argv[2] === "--force" ? true : false;
+
+const typespecModulePath = path.join(__dirname, "..", "node_modules", "@azure-tools", "typespec-python");
+
+// Define the source and destination directories
+const sourceDir = path.join(typespecModulePath, "generator");
+const destDir = path.join(__dirname, "..", "generator");
+
+// Delete the destination directory if it exists
+if (fs.existsSync(destDir)) {
+    if (force) fs.removeSync(destDir);
+    else process.exit(0);
+}
+
+// Copy the source directory to the destination directory
+fs.copySync(sourceDir, destDir);
diff --git a/packages/autorest.python/install.py b/packages/autorest.python/scripts/install.py
similarity index 85%
rename from packages/autorest.python/install.py
rename to packages/autorest.python/scripts/install.py
index 14ae38dd278..7b687f1171d 100644
--- a/packages/autorest.python/install.py
+++ b/packages/autorest.python/scripts/install.py
@@ -23,17 +23,15 @@
 
 # Now we have pip and Py >= 3.8, go to work
 
-import subprocess
 from pathlib import Path
 
 from venvtools import ExtendedEnvBuilder, python_run
 
-_ROOT_DIR = Path(__file__).parent
+_ROOT_DIR = Path(__file__).parent.parent
 
 
 def main():
     venv_path = _ROOT_DIR / "venv"
-
     if venv_path.exists():
         env_builder = venv.EnvBuilder(with_pip=True)
         venv_context = env_builder.ensure_directories(venv_path)
@@ -43,8 +41,8 @@ def main():
         venv_context = env_builder.context
 
         python_run(venv_context, "pip", ["install", "-U", "pip"])
-        python_run(venv_context, "pip", ["install", "-r", "requirements.txt"])
-        python_run(venv_context, "pip", ["install", "-e", str(_ROOT_DIR)])
+        python_run(venv_context, "pip", ["install", "-r", f"{_ROOT_DIR}/requirements.txt"])
+        python_run(venv_context, "pip", ["install", "-e", f"{_ROOT_DIR}/generator"])
 
 
 if __name__ == "__main__":
diff --git a/packages/autorest.python/prepare.py b/packages/autorest.python/scripts/prepare.py
similarity index 77%
rename from packages/autorest.python/prepare.py
rename to packages/autorest.python/scripts/prepare.py
index 84b592e30ee..eb89f7555b2 100644
--- a/packages/autorest.python/prepare.py
+++ b/packages/autorest.python/scripts/prepare.py
@@ -6,6 +6,8 @@
 # license information.
 # --------------------------------------------------------------------------
 import sys
+import os
+import argparse
 
 if not sys.version_info >= (3, 8, 0):
     raise Exception("Autorest for Python extension requires Python 3.8 at least")
@@ -15,7 +17,7 @@
 
 from venvtools import python_run
 
-_ROOT_DIR = Path(__file__).parent
+_ROOT_DIR = Path(__file__).parent.parent
 
 
 def main():
@@ -26,9 +28,10 @@ def main():
 
     env_builder = venv.EnvBuilder(with_pip=True)
     venv_context = env_builder.ensure_directories(venv_path)
-    requirements_path = _ROOT_DIR / "dev_requirements.txt"
-
-    python_run(venv_context, "pip", ["install", "-r", str(requirements_path)])
+    try:
+        python_run(venv_context, "pip", ["install", "-r", f"{_ROOT_DIR}/dev_requirements.txt"])
+    except FileNotFoundError as e:
+        raise ValueError(e.filename)
 
 
 if __name__ == "__main__":
diff --git a/packages/autorest.python/scripts/run-python3.js b/packages/autorest.python/scripts/run-python3.js
new file mode 100644
index 00000000000..020cbce0a0f
--- /dev/null
+++ b/packages/autorest.python/scripts/run-python3.js
@@ -0,0 +1,22 @@
+// This script wraps logic in @azure-tools/extension to resolve
+// the path to Python 3 so that a Python script file can be run
+// from an npm script in package.json.  It uses the same Python 3
+// path resolution algorithm as AutoRest so that the behavior
+// is fully consistent (and also supports AUTOREST_PYTHON_EXE).
+//
+// Invoke it like so: "node run-python3.js script.py"
+
+const cp = require("child_process");
+const extension = require("@autorest/system-requirements");
+
+async function runPython3(scriptName, ...args) {
+  const command = await extension.patchPythonPath(["python", scriptName, ...args], { version: ">=3.8", environmentVariable: "AUTOREST_PYTHON_EXE" });
+  cp.execSync(command.join(" "), {
+    stdio: [0, 1, 2]
+  });
+}
+
+runPython3(...process.argv.slice(2)).catch(err => {
+  console.error(err.toString());
+  process.exit(1);
+});
diff --git a/packages/autorest.python/start.py b/packages/autorest.python/scripts/start.py
similarity index 96%
rename from packages/autorest.python/start.py
rename to packages/autorest.python/scripts/start.py
index fdf57593653..714fc50155f 100644
--- a/packages/autorest.python/start.py
+++ b/packages/autorest.python/scripts/start.py
@@ -15,7 +15,7 @@
 
 from venvtools import python_run
 
-_ROOT_DIR = Path(__file__).parent
+_ROOT_DIR = Path(__file__).parent.parent
 
 
 def main():
diff --git a/packages/autorest.python/venvtools.py b/packages/autorest.python/scripts/venvtools.py
similarity index 98%
rename from packages/autorest.python/venvtools.py
rename to packages/autorest.python/scripts/venvtools.py
index 01e1300b1c8..944ff96e36b 100644
--- a/packages/autorest.python/venvtools.py
+++ b/packages/autorest.python/scripts/venvtools.py
@@ -11,7 +11,7 @@
 from pathlib import Path
 
 
-_ROOT_DIR = Path(__file__).parent
+_ROOT_DIR = Path(__file__).parent.parent
 
 
 class ExtendedEnvBuilder(venv.EnvBuilder):
diff --git a/packages/autorest.python/test/unittests/requirements.txt b/packages/autorest.python/test/unittests/requirements.txt
index e68ca624cb2..64ba07b3d92 100644
--- a/packages/autorest.python/test/unittests/requirements.txt
+++ b/packages/autorest.python/test/unittests/requirements.txt
@@ -4,3 +4,4 @@ pytest
 pytest-cov
 azure-core==1.30.0
 -e ../../.
+-e ../../node_modules/@azure-tools/typespec-python/generator
diff --git a/packages/autorest.python/test/unittests/test_m2r.py b/packages/autorest.python/test/unittests/test_m2r.py
index 8ac1287dda3..f61941a3b7e 100644
--- a/packages/autorest.python/test/unittests/test_m2r.py
+++ b/packages/autorest.python/test/unittests/test_m2r.py
@@ -3,7 +3,7 @@
 # Licensed under the MIT License. See License.txt in the project root for
 # license information.
 # --------------------------------------------------------------------------
-from autorest.m2r import M2R
+from pygen.m2r import M2R
 
 
 _MD_LINK = "[inline link](https://github.com/Azure/autorest.python)"
diff --git a/packages/autorest.python/test/unittests/test_name_converter.py b/packages/autorest.python/test/unittests/test_name_converter.py
index 1e650033e9b..930eb0fc60d 100644
--- a/packages/autorest.python/test/unittests/test_name_converter.py
+++ b/packages/autorest.python/test/unittests/test_name_converter.py
@@ -3,8 +3,8 @@
 # Licensed under the MIT License. See License.txt in the project root for
 # license information.
 # --------------------------------------------------------------------------
-from autorest.preprocess import PreProcessPlugin
-from autorest.preprocess.python_mappings import PadType
+from pygen.preprocess import PreProcessPlugin
+from pygen.preprocess.python_mappings import PadType
 
 
 def pad_reserved_words(name: str, pad_type: PadType) -> str:
diff --git a/packages/autorest.python/test/unittests/test_optional_return_type.py b/packages/autorest.python/test/unittests/test_optional_return_type.py
index 1a4cfae46e5..26f413714cf 100644
--- a/packages/autorest.python/test/unittests/test_optional_return_type.py
+++ b/packages/autorest.python/test/unittests/test_optional_return_type.py
@@ -5,7 +5,7 @@
 # --------------------------------------------------------------------------
 
 import pytest
-from autorest.codegen.models import (
+from pygen.codegen.models import (
     Operation,
     LROOperation,
     PagingOperation,
@@ -15,8 +15,8 @@
     RequestBuilder,
     Client,
 )
-from autorest.codegen.models.parameter_list import RequestBuilderParameterList
-from autorest.codegen.models.primitive_types import StringType
+from pygen.codegen.models.parameter_list import RequestBuilderParameterList
+from pygen.codegen.models.primitive_types import StringType
 
 
 @pytest.fixture
diff --git a/packages/autorest.python/test/unittests/test_parameter_ordering.py b/packages/autorest.python/test/unittests/test_parameter_ordering.py
index 8c68fd14863..4f64c991adf 100644
--- a/packages/autorest.python/test/unittests/test_parameter_ordering.py
+++ b/packages/autorest.python/test/unittests/test_parameter_ordering.py
@@ -3,8 +3,8 @@
 # Licensed under the MIT License. See License.txt in the project root for
 # license information.
 # --------------------------------------------------------------------------
-from autorest.codegen.models import Parameter, AnyType, CodeModel, StringType
-from autorest.codegen.models.parameter_list import ParameterList
+from pygen.codegen.models import Parameter, AnyType, CodeModel, StringType
+from pygen.codegen.models.parameter_list import ParameterList
 
 
 def get_code_model():
diff --git a/packages/autorest.python/test/unittests/test_sort_schema.py b/packages/autorest.python/test/unittests/test_sort_schema.py
index 156b162598b..253b83f100e 100644
--- a/packages/autorest.python/test/unittests/test_sort_schema.py
+++ b/packages/autorest.python/test/unittests/test_sort_schema.py
@@ -4,7 +4,7 @@
 # license information.
 # --------------------------------------------------------------------------
 
-from autorest.codegen.models import CodeModel, DPGModelType
+from pygen.codegen.models import CodeModel, DPGModelType
 
 
 def get_code_model():
diff --git a/packages/typespec-python/dev_requirements.txt b/packages/typespec-python/dev_requirements.txt
index 3d4fe7e401b..6dc5274999a 100644
--- a/packages/typespec-python/dev_requirements.txt
+++ b/packages/typespec-python/dev_requirements.txt
@@ -1,3 +1,4 @@
 -r ../../eng/requirements.txt
 -r ../../eng/dev_requirements.txt
+-e generator
 
diff --git a/packages/typespec-python/generator/LICENSE b/packages/typespec-python/generator/LICENSE
new file mode 100644
index 00000000000..21071075c24
--- /dev/null
+++ b/packages/typespec-python/generator/LICENSE
@@ -0,0 +1,21 @@
+    MIT License
+
+    Copyright (c) Microsoft Corporation. All rights reserved.
+
+    Permission is hereby granted, free of charge, to any person obtaining a copy
+    of this software and associated documentation files (the "Software"), to deal
+    in the Software without restriction, including without limitation the rights
+    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+    copies of the Software, and to permit persons to whom the Software is
+    furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included in all
+    copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+    SOFTWARE
diff --git a/packages/typespec-python/generator/README.md b/packages/typespec-python/generator/README.md
new file mode 100644
index 00000000000..3d8a65a8919
--- /dev/null
+++ b/packages/typespec-python/generator/README.md
@@ -0,0 +1 @@
+# Core Library for Python Generation
diff --git a/packages/typespec-python/generator/dev_requirements.txt b/packages/typespec-python/generator/dev_requirements.txt
new file mode 100644
index 00000000000..867580b72a4
--- /dev/null
+++ b/packages/typespec-python/generator/dev_requirements.txt
@@ -0,0 +1,5 @@
+-e ./generator
+-r ../../../eng/requirements.txt
+-r ../../../eng/dev_requirements.txt
+ptvsd==4.3.2
+types-PyYAML==6.0.12.8
diff --git a/packages/typespec-python/generator/pygen/__init__.py b/packages/typespec-python/generator/pygen/__init__.py
new file mode 100644
index 00000000000..6050cbec00f
--- /dev/null
+++ b/packages/typespec-python/generator/pygen/__init__.py
@@ -0,0 +1,107 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import logging
+from pathlib import Path
+import json
+from abc import ABC, abstractmethod
+from typing import Any, Dict, Union, List
+
+import yaml
+
+from ._version import VERSION
+
+
+__version__ = VERSION
+_LOGGER = logging.getLogger(__name__)
+
+
+class ReaderAndWriter:
+    def __init__(self, *, output_folder: Union[str, Path], **kwargs: Any) -> None:
+        self.output_folder = Path(output_folder)
+        self._list_file: List[str] = []
+        try:
+            with open(
+                Path(self.output_folder) / Path("..") / Path("python.json"),
+                "r",
+                encoding="utf-8-sig",
+            ) as fd:
+                python_json = json.load(fd)
+        except Exception:  # pylint: disable=broad-except
+            python_json = {}
+        self.options = kwargs
+        if python_json:
+            _LOGGER.warning("Loading python.json file. This behavior will be depreacted")
+        self.options.update(python_json)
+
+    def read_file(self, path: Union[str, Path]) -> str:
+        """Directly reading from disk"""
+        # make path relative to output folder
+        try:
+            with open(self.output_folder / Path(path), "r", encoding="utf-8-sig") as fd:
+                return fd.read()
+        except FileNotFoundError:
+            return ""
+
+    def write_file(self, filename: Union[str, Path], file_content: str) -> None:
+        """Directly writing to disk"""
+        file_folder = Path(filename).parent
+        if not Path.is_dir(self.output_folder / file_folder):
+            Path.mkdir(self.output_folder / file_folder, parents=True)
+        with open(self.output_folder / Path(filename), "w", encoding="utf-8") as fd:
+            fd.write(file_content)
+
+    def list_file(self) -> List[str]:
+        return [str(f) for f in self.output_folder.glob("**/*") if f.is_file()]
+
+
+class Plugin(ReaderAndWriter, ABC):
+    """A base class for autorest plugin.
+
+    :param autorestapi: An autorest API instance
+    """
+
+    @abstractmethod
+    def process(self) -> bool:
+        """The plugin process.
+
+        :rtype: bool
+        :returns: True if everything's ok, False optherwise
+        :raises Exception: Could raise any exception, stacktrace will be sent to autorest API
+        """
+        raise NotImplementedError()
+
+
+class YamlUpdatePlugin(Plugin):
+    """A plugin that update the YAML as input."""
+
+    def get_yaml(self) -> Dict[str, Any]:
+        # cadl file doesn't have to be relative to output folder
+        with open(self.options["cadl_file"], "r", encoding="utf-8-sig") as fd:
+            return yaml.safe_load(fd.read())
+
+    def write_yaml(self, yaml_string: str) -> None:
+        with open(self.options["cadl_file"], "w", encoding="utf-8-sig") as fd:
+            fd.write(yaml_string)
+
+    def process(self) -> bool:
+        # List the input file, should be only one
+        yaml_data = self.get_yaml()
+
+        self.update_yaml(yaml_data)
+
+        yaml_string = yaml.safe_dump(yaml_data)
+
+        self.write_yaml(yaml_string)
+        return True
+
+    @abstractmethod
+    def update_yaml(self, yaml_data: Dict[str, Any]) -> None:
+        """The code-model-v4-no-tags yaml model tree.
+
+        :rtype: updated yaml
+        :raises Exception: Could raise any exception, stacktrace will be sent to autorest API
+        """
+        raise NotImplementedError()
diff --git a/packages/typespec-python/generator/pygen/_version.py b/packages/typespec-python/generator/pygen/_version.py
new file mode 100644
index 00000000000..aadc0f31ff8
--- /dev/null
+++ b/packages/typespec-python/generator/pygen/_version.py
@@ -0,0 +1,7 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+
+VERSION = "0.1.0"
diff --git a/packages/autorest.python/autorest/black/__init__.py b/packages/typespec-python/generator/pygen/black.py
similarity index 89%
rename from packages/autorest.python/autorest/black/__init__.py
rename to packages/typespec-python/generator/pygen/black.py
index 8df1c79241c..b1d48aff821 100644
--- a/packages/autorest.python/autorest/black/__init__.py
+++ b/packages/typespec-python/generator/pygen/black.py
@@ -10,8 +10,8 @@
 import black
 from black.report import NothingChanged
 
-from .. import Plugin, PluginAutorest
-from .._utils import parse_args
+from . import Plugin
+from .utils import parse_args
 
 _LOGGER = logging.getLogger("blib2to3")
 
@@ -65,11 +65,6 @@ def format_file(self, file: Path) -> None:
             self.write_file(file, file_content)
 
 
-class BlackScriptPluginAutorest(BlackScriptPlugin, PluginAutorest):
-    def get_options(self) -> Dict[str, Any]:
-        return {"output_folder": self._autorestapi.get_value("outputFolderUri")}
-
-
 if __name__ == "__main__":
     # CADL pipeline will call this
     args, unknown_args = parse_args(need_cadl_file=False)
diff --git a/packages/autorest.python/autorest/codegen/__init__.py b/packages/typespec-python/generator/pygen/codegen/__init__.py
similarity index 72%
rename from packages/autorest.python/autorest/codegen/__init__.py
rename to packages/typespec-python/generator/pygen/codegen/__init__.py
index ecfb70f5752..ea4716f86e6 100644
--- a/packages/autorest.python/autorest/codegen/__init__.py
+++ b/packages/typespec-python/generator/pygen/codegen/__init__.py
@@ -9,10 +9,10 @@
 import yaml
 
 
-from .. import Plugin, PluginAutorest
-from .._utils import parse_args
+from .. import Plugin
+from ..utils import parse_args
 from .models.code_model import CodeModel
-from .serializers import JinjaSerializer, JinjaSerializerAutorest
+from .serializers import JinjaSerializer
 from ._utils import DEFAULT_HEADER_TEXT, VALID_PACKAGE_MODE, TYPESPEC_PACKAGE_MODE
 
 
@@ -324,86 +324,6 @@ def process(self) -> bool:
         return True
 
 
-class CodeGeneratorAutorest(CodeGenerator, PluginAutorest):
-    def get_options(self) -> Dict[str, Any]:
-        if self._autorestapi.get_boolean_value("python3-only") is False:
-            _LOGGER.warning("You have passed in --python3-only=False. We have force overriden this to True.")
-        if self._autorestapi.get_boolean_value("add-python3-operation-files"):
-            _LOGGER.warning(
-                "You have passed in --add-python3-operation-files. "
-                "This flag no longer has an effect bc all SDKs are now Python3 only."
-            )
-        if self._autorestapi.get_boolean_value("reformat-next-link"):
-            _LOGGER.warning(
-                "You have passed in --reformat-next-link. We have force overriden "
-                "this to False because we no longer reformat initial query parameters into next "
-                "calls unless explicitly defined in the service definition."
-            )
-        options = {
-            "azure-arm": self._autorestapi.get_boolean_value("azure-arm"),
-            "header-text": self._autorestapi.get_value("header-text"),
-            "low-level-client": self._autorestapi.get_boolean_value("low-level-client", False),
-            "version-tolerant": self._autorestapi.get_boolean_value("version-tolerant", True),
-            "show-operations": self._autorestapi.get_boolean_value("show-operations"),
-            "python3-only": self._autorestapi.get_boolean_value("python3-only"),
-            "head-as-boolean": self._autorestapi.get_boolean_value("head-as-boolean", False),
-            "keep-version-file": self._autorestapi.get_boolean_value("keep-version-file"),
-            "no-async": self._autorestapi.get_boolean_value("no-async"),
-            "no-namespace-folders": self._autorestapi.get_boolean_value("no-namespace-folders"),
-            "basic-setup-py": self._autorestapi.get_boolean_value("basic-setup-py"),
-            "package-name": self._autorestapi.get_value("package-name"),
-            "package-version": self._autorestapi.get_value("package-version"),
-            "client-side-validation": self._autorestapi.get_boolean_value("client-side-validation"),
-            "tracing": self._autorestapi.get_boolean_value("trace"),
-            "multiapi": self._autorestapi.get_boolean_value("multiapi", False),
-            "polymorphic-examples": self._autorestapi.get_value("polymorphic-examples"),
-            "models-mode": self._autorestapi.get_value("models-mode"),
-            "builders-visibility": self._autorestapi.get_value("builders-visibility"),
-            "show-send-request": self._autorestapi.get_boolean_value("show-send-request"),
-            "only-path-and-body-params-positional": self._autorestapi.get_boolean_value(
-                "only-path-and-body-params-positional"
-            ),
-            "combine-operation-files": self._autorestapi.get_boolean_value("combine-operation-files"),
-            "package-mode": self._autorestapi.get_value("package-mode"),
-            "package-pprint-name": self._autorestapi.get_value("package-pprint-name"),
-            "packaging-files-config": self._autorestapi.get_value("package-configuration"),
-            "default-optional-constants-to-none": self._autorestapi.get_boolean_value(
-                "default-optional-constants-to-none"
-            ),
-            "generate-sample": self._autorestapi.get_boolean_value("generate-sample"),
-            "generate-test": self._autorestapi.get_boolean_value("generate-test"),
-            "default-api-version": self._autorestapi.get_value("default-api-version"),
-        }
-        return {k: v for k, v in options.items() if v is not None}
-
-    def get_yaml(self) -> Dict[str, Any]:
-        inputs = self._autorestapi.list_inputs()
-        _LOGGER.debug("Possible Inputs: %s", inputs)
-        if "code-model-v4-no-tags.yaml" not in inputs:
-            raise ValueError("code-model-v4-no-tags.yaml must be a possible input")
-
-        if self._autorestapi.get_value("input-yaml"):
-            input_yaml = self._autorestapi.get_value("input-yaml")
-            file_content = self._autorestapi.read_file(input_yaml)
-        else:
-            inputs = self._autorestapi.list_inputs()
-            _LOGGER.debug("Possible Inputs: %s", inputs)
-            if "code-model-v4-no-tags.yaml" not in inputs:
-                raise ValueError("code-model-v4-no-tags.yaml must be a possible input")
-
-            file_content = self._autorestapi.read_file("code-model-v4-no-tags.yaml")
-
-        # Parse the received YAML
-        return yaml.safe_load(file_content)
-
-    def get_serializer(self, code_model: CodeModel):
-        return JinjaSerializerAutorest(
-            self._autorestapi,
-            code_model,
-            output_folder=self.output_folder,
-        )
-
-
 if __name__ == "__main__":
     # CADL pipeline will call this
     parsed_args, unknown_args = parse_args()
diff --git a/packages/autorest.python/autorest/codegen/_utils.py b/packages/typespec-python/generator/pygen/codegen/_utils.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/_utils.py
rename to packages/typespec-python/generator/pygen/codegen/_utils.py
diff --git a/packages/autorest.python/autorest/codegen/models/__init__.py b/packages/typespec-python/generator/pygen/codegen/models/__init__.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/__init__.py
rename to packages/typespec-python/generator/pygen/codegen/models/__init__.py
diff --git a/packages/autorest.python/autorest/codegen/models/base.py b/packages/typespec-python/generator/pygen/codegen/models/base.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/base.py
rename to packages/typespec-python/generator/pygen/codegen/models/base.py
diff --git a/packages/autorest.python/autorest/codegen/models/base_builder.py b/packages/typespec-python/generator/pygen/codegen/models/base_builder.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/base_builder.py
rename to packages/typespec-python/generator/pygen/codegen/models/base_builder.py
diff --git a/packages/autorest.python/autorest/codegen/models/client.py b/packages/typespec-python/generator/pygen/codegen/models/client.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/client.py
rename to packages/typespec-python/generator/pygen/codegen/models/client.py
diff --git a/packages/autorest.python/autorest/codegen/models/code_model.py b/packages/typespec-python/generator/pygen/codegen/models/code_model.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/code_model.py
rename to packages/typespec-python/generator/pygen/codegen/models/code_model.py
diff --git a/packages/autorest.python/autorest/codegen/models/combined_type.py b/packages/typespec-python/generator/pygen/codegen/models/combined_type.py
similarity index 98%
rename from packages/autorest.python/autorest/codegen/models/combined_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/combined_type.py
index ef714c949ad..5eeea95c625 100644
--- a/packages/autorest.python/autorest/codegen/models/combined_type.py
+++ b/packages/typespec-python/generator/pygen/codegen/models/combined_type.py
@@ -5,7 +5,7 @@
 # --------------------------------------------------------------------------
 from typing import Any, Dict, List, Optional, TYPE_CHECKING, Type, Tuple, Union
 import re
-from autorest.codegen.models.imports import FileImport, ImportType, TypingSection
+from .imports import FileImport, ImportType, TypingSection
 from .base import BaseType
 from .model_type import ModelType
 
diff --git a/packages/autorest.python/autorest/codegen/models/constant_type.py b/packages/typespec-python/generator/pygen/codegen/models/constant_type.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/constant_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/constant_type.py
diff --git a/packages/autorest.python/autorest/codegen/models/credential_types.py b/packages/typespec-python/generator/pygen/codegen/models/credential_types.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/credential_types.py
rename to packages/typespec-python/generator/pygen/codegen/models/credential_types.py
diff --git a/packages/autorest.python/autorest/codegen/models/dictionary_type.py b/packages/typespec-python/generator/pygen/codegen/models/dictionary_type.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/dictionary_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/dictionary_type.py
diff --git a/packages/autorest.python/autorest/codegen/models/enum_type.py b/packages/typespec-python/generator/pygen/codegen/models/enum_type.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/enum_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/enum_type.py
diff --git a/packages/autorest.python/autorest/codegen/models/imports.py b/packages/typespec-python/generator/pygen/codegen/models/imports.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/imports.py
rename to packages/typespec-python/generator/pygen/codegen/models/imports.py
diff --git a/packages/autorest.python/autorest/codegen/models/list_type.py b/packages/typespec-python/generator/pygen/codegen/models/list_type.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/list_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/list_type.py
diff --git a/packages/autorest.python/autorest/codegen/models/lro_operation.py b/packages/typespec-python/generator/pygen/codegen/models/lro_operation.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/lro_operation.py
rename to packages/typespec-python/generator/pygen/codegen/models/lro_operation.py
diff --git a/packages/autorest.python/autorest/codegen/models/lro_paging_operation.py b/packages/typespec-python/generator/pygen/codegen/models/lro_paging_operation.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/lro_paging_operation.py
rename to packages/typespec-python/generator/pygen/codegen/models/lro_paging_operation.py
diff --git a/packages/autorest.python/autorest/codegen/models/model_type.py b/packages/typespec-python/generator/pygen/codegen/models/model_type.py
similarity index 99%
rename from packages/autorest.python/autorest/codegen/models/model_type.py
rename to packages/typespec-python/generator/pygen/codegen/models/model_type.py
index c46c1467d1e..f2a7963e074 100644
--- a/packages/autorest.python/autorest/codegen/models/model_type.py
+++ b/packages/typespec-python/generator/pygen/codegen/models/model_type.py
@@ -7,7 +7,7 @@
 from collections import OrderedDict
 from typing import Any, Dict, List, Optional, TYPE_CHECKING, cast
 import sys
-from autorest.codegen.models.utils import (
+from .utils import (
     add_to_pylint_disable,
     NAME_LENGTH_LIMIT,
 )
diff --git a/packages/autorest.python/autorest/codegen/models/operation.py b/packages/typespec-python/generator/pygen/codegen/models/operation.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/operation.py
rename to packages/typespec-python/generator/pygen/codegen/models/operation.py
diff --git a/packages/autorest.python/autorest/codegen/models/operation_group.py b/packages/typespec-python/generator/pygen/codegen/models/operation_group.py
similarity index 99%
rename from packages/autorest.python/autorest/codegen/models/operation_group.py
rename to packages/typespec-python/generator/pygen/codegen/models/operation_group.py
index bf890b6565e..23b6f4daaba 100644
--- a/packages/autorest.python/autorest/codegen/models/operation_group.py
+++ b/packages/typespec-python/generator/pygen/codegen/models/operation_group.py
@@ -5,7 +5,7 @@
 # --------------------------------------------------------------------------
 from typing import Dict, List, Any, TYPE_CHECKING
 
-from autorest.codegen.models.utils import OrderedSet
+from .utils import OrderedSet
 
 from .base import BaseModel
 from .operation import get_operation
diff --git a/packages/autorest.python/autorest/codegen/models/paging_operation.py b/packages/typespec-python/generator/pygen/codegen/models/paging_operation.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/paging_operation.py
rename to packages/typespec-python/generator/pygen/codegen/models/paging_operation.py
diff --git a/packages/autorest.python/autorest/codegen/models/parameter.py b/packages/typespec-python/generator/pygen/codegen/models/parameter.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/parameter.py
rename to packages/typespec-python/generator/pygen/codegen/models/parameter.py
diff --git a/packages/autorest.python/autorest/codegen/models/parameter_list.py b/packages/typespec-python/generator/pygen/codegen/models/parameter_list.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/parameter_list.py
rename to packages/typespec-python/generator/pygen/codegen/models/parameter_list.py
diff --git a/packages/autorest.python/autorest/codegen/models/primitive_types.py b/packages/typespec-python/generator/pygen/codegen/models/primitive_types.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/primitive_types.py
rename to packages/typespec-python/generator/pygen/codegen/models/primitive_types.py
diff --git a/packages/autorest.python/autorest/codegen/models/property.py b/packages/typespec-python/generator/pygen/codegen/models/property.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/property.py
rename to packages/typespec-python/generator/pygen/codegen/models/property.py
diff --git a/packages/autorest.python/autorest/codegen/models/request_builder.py b/packages/typespec-python/generator/pygen/codegen/models/request_builder.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/request_builder.py
rename to packages/typespec-python/generator/pygen/codegen/models/request_builder.py
diff --git a/packages/autorest.python/autorest/codegen/models/request_builder_parameter.py b/packages/typespec-python/generator/pygen/codegen/models/request_builder_parameter.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/request_builder_parameter.py
rename to packages/typespec-python/generator/pygen/codegen/models/request_builder_parameter.py
diff --git a/packages/autorest.python/autorest/codegen/models/response.py b/packages/typespec-python/generator/pygen/codegen/models/response.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/response.py
rename to packages/typespec-python/generator/pygen/codegen/models/response.py
diff --git a/packages/autorest.python/autorest/codegen/models/utils.py b/packages/typespec-python/generator/pygen/codegen/models/utils.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/models/utils.py
rename to packages/typespec-python/generator/pygen/codegen/models/utils.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/__init__.py b/packages/typespec-python/generator/pygen/codegen/serializers/__init__.py
similarity index 97%
rename from packages/autorest.python/autorest/codegen/serializers/__init__.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/__init__.py
index 377a6b20ad1..ee3d27ff8ad 100644
--- a/packages/autorest.python/autorest/codegen/serializers/__init__.py
+++ b/packages/typespec-python/generator/pygen/codegen/serializers/__init__.py
@@ -8,8 +8,7 @@
 from pathlib import Path
 from jinja2 import PackageLoader, Environment, FileSystemLoader, StrictUndefined
 
-from ... import ReaderAndWriter, ReaderAndWriterAutorest
-from ...jsonrpc import AutorestAPI
+from ... import ReaderAndWriter
 from ..models import (
     OperationGroup,
     RequestBuilder,
@@ -29,7 +28,7 @@
 from .sample_serializer import SampleSerializer
 from .test_serializer import TestSerializer, TestGeneralSerializer
 from .types_serializer import TypesSerializer
-from ..._utils import to_snake_case
+from ...utils import to_snake_case
 from .._utils import VALID_PACKAGE_MODE
 from .utils import (
     extract_sample_name,
@@ -138,7 +137,7 @@ def _serialize_namespace_level(self, env: Environment, namespace_path: Path, cli
 
     def serialize(self) -> None:
         env = Environment(
-            loader=PackageLoader("autorest.codegen", "templates"),
+            loader=PackageLoader("pygen.codegen", "templates"),
             keep_trailing_newline=True,
             line_statement_prefix="##",
             line_comment_prefix="###",
@@ -196,7 +195,7 @@ def _serialize_and_write_package_files(self, namespace_path: Path) -> None:
         root_of_sdk = self._package_root_folder(namespace_path)
         if self.code_model.options["package_mode"] in VALID_PACKAGE_MODE:
             env = Environment(
-                loader=PackageLoader("autorest.codegen", "templates/packaging_templates"),
+                loader=PackageLoader("pygen.codegen", "templates/packaging_templates"),
                 undefined=StrictUndefined,
             )
 
@@ -569,20 +568,3 @@ def _serialize_and_write_test(self, env: Environment, namespace_path: Path):
                         log_error = f"error happens in test generation for operation group {og.class_name}: {e}"
                         _LOGGER.error(log_error)
         self.code_model.for_test = False
-
-
-class JinjaSerializerAutorest(JinjaSerializer, ReaderAndWriterAutorest):
-    def __init__(
-        self,
-        autorestapi: AutorestAPI,
-        code_model: CodeModel,
-        *,
-        output_folder: Union[str, Path],
-        **kwargs: Any,
-    ) -> None:
-        super().__init__(
-            autorestapi=autorestapi,
-            code_model=code_model,
-            output_folder=output_folder,
-            **kwargs,
-        )
diff --git a/packages/autorest.python/autorest/codegen/serializers/base_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/base_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/base_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/base_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/builder_serializer.py
similarity index 99%
rename from packages/autorest.python/autorest/codegen/serializers/builder_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/builder_serializer.py
index 3d1196354fb..e65439ea156 100644
--- a/packages/autorest.python/autorest/codegen/serializers/builder_serializer.py
+++ b/packages/typespec-python/generator/pygen/codegen/serializers/builder_serializer.py
@@ -36,7 +36,7 @@
 from .parameter_serializer import ParameterSerializer, PopKwargType
 from ..models.parameter_list import ParameterType
 from . import utils
-from ..._utils import JSON_REGEXP
+from ...utils import JSON_REGEXP
 
 T = TypeVar("T")
 OrderedSet = Dict[T, None]
diff --git a/packages/autorest.python/autorest/codegen/serializers/client_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/client_serializer.py
similarity index 99%
rename from packages/autorest.python/autorest/codegen/serializers/client_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/client_serializer.py
index ce8dfd87964..28041370efb 100644
--- a/packages/autorest.python/autorest/codegen/serializers/client_serializer.py
+++ b/packages/typespec-python/generator/pygen/codegen/serializers/client_serializer.py
@@ -8,7 +8,7 @@
 from . import utils
 from ..models import Client, ParameterMethodLocation
 from .parameter_serializer import ParameterSerializer, PopKwargType
-from ..._utils import build_policies
+from ...utils import build_policies
 
 
 class ClientSerializer:
diff --git a/packages/autorest.python/autorest/codegen/serializers/enum_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/enum_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/enum_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/enum_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/general_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/general_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/general_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/general_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/import_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/import_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/import_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/import_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/metadata_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/metadata_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/metadata_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/metadata_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/model_init_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/model_init_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/model_init_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/model_init_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/model_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/model_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/model_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/model_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/operation_groups_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/operation_groups_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/operation_groups_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/operation_groups_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/operations_init_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/operations_init_serializer.py
similarity index 95%
rename from packages/autorest.python/autorest/codegen/serializers/operations_init_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/operations_init_serializer.py
index 83966ffa899..02232c527c5 100644
--- a/packages/autorest.python/autorest/codegen/serializers/operations_init_serializer.py
+++ b/packages/typespec-python/generator/pygen/codegen/serializers/operations_init_serializer.py
@@ -6,7 +6,7 @@
 from typing import List
 from jinja2 import Environment
 
-from autorest.codegen.models.operation_group import OperationGroup
+from ..models.operation_group import OperationGroup
 from ..models import CodeModel, Client
 
 
diff --git a/packages/autorest.python/autorest/codegen/serializers/parameter_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/parameter_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/parameter_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/parameter_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/patch_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/patch_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/patch_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/patch_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/request_builders_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/request_builders_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/request_builders_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/request_builders_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/sample_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/sample_serializer.py
similarity index 98%
rename from packages/autorest.python/autorest/codegen/serializers/sample_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/sample_serializer.py
index ccf1e9dfe7a..5694804c687 100644
--- a/packages/autorest.python/autorest/codegen/serializers/sample_serializer.py
+++ b/packages/typespec-python/generator/pygen/codegen/serializers/sample_serializer.py
@@ -8,7 +8,7 @@
 from typing import Dict, Any, Union, Tuple
 from jinja2 import Environment
 
-from autorest.codegen.models.operation import OperationBase
+from ..models.operation import OperationBase
 from .import_serializer import FileImportSerializer
 from .base_serializer import BaseSerializer
 from ..models import (
@@ -22,7 +22,7 @@
     FileImport,
 )
 from .utils import get_namespace_config, get_namespace_from_package_name
-from ..._utils import to_snake_case
+from ...utils import to_snake_case
 
 _LOGGER = logging.getLogger(__name__)
 
diff --git a/packages/autorest.python/autorest/codegen/serializers/test_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/test_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/test_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/test_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/types_serializer.py b/packages/typespec-python/generator/pygen/codegen/serializers/types_serializer.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/types_serializer.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/types_serializer.py
diff --git a/packages/autorest.python/autorest/codegen/serializers/utils.py b/packages/typespec-python/generator/pygen/codegen/serializers/utils.py
similarity index 100%
rename from packages/autorest.python/autorest/codegen/serializers/utils.py
rename to packages/typespec-python/generator/pygen/codegen/serializers/utils.py
diff --git a/packages/autorest.python/autorest/codegen/templates/client.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/client.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/client.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/client.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/client_container.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/client_container.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/client_container.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/client_container.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/config.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/config.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/config.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/config.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/config_container.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/config_container.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/config_container.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/config_container.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/conftest.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/conftest.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/conftest.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/conftest.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/enum.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/enum.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/enum.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/enum.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/enum_container.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/enum_container.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/enum_container.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/enum_container.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/init.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/init.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/init.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/init.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/keywords.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/keywords.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/keywords.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/keywords.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/lro_operation.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/lro_operation.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/lro_operation.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/lro_operation.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/lro_paging_operation.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/lro_paging_operation.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/lro_paging_operation.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/lro_paging_operation.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/macros.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/macros.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/macros.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/macros.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/metadata.json.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/metadata.json.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/metadata.json.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/metadata.json.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/model_base.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_base.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/model_base.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/model_base.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/model_container.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_container.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/model_container.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/model_container.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/model_dpg.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/model_dpg.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/model_dpg.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/model_init.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_init.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/model_init.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/model_init.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/model_msrest.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/model_msrest.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/model_msrest.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/model_msrest.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/operation.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/operation.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/operation.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/operation.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/operation_group.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/operation_group.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/operation_group.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/operation_group.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/operation_groups_container.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/operation_groups_container.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/operation_groups_container.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/operation_groups_container.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/operation_tools.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/operation_tools.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/operation_tools.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/operation_tools.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/operations_folder_init.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/operations_folder_init.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/operations_folder_init.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/operations_folder_init.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/CHANGELOG.md.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/CHANGELOG.md.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/CHANGELOG.md.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/CHANGELOG.md.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/LICENSE.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/LICENSE.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/LICENSE.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/LICENSE.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/MANIFEST.in.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/MANIFEST.in.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/MANIFEST.in.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/MANIFEST.in.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/README.md.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/README.md.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/README.md.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/README.md.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/dev_requirements.txt.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/dev_requirements.txt.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/dev_requirements.txt.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/dev_requirements.txt.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/packaging_templates/setup.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/setup.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/packaging_templates/setup.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/packaging_templates/setup.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/paging_operation.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/paging_operation.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/paging_operation.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/paging_operation.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/patch.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/patch.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/patch.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/patch.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/pkgutil_init.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/pkgutil_init.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/pkgutil_init.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/pkgutil_init.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/request_builder.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/request_builder.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/request_builder.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/request_builder.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/request_builders.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/request_builders.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/request_builders.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/request_builders.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/rest_init.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/rest_init.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/rest_init.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/rest_init.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/sample.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/sample.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/sample.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/sample.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/serialization.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/serialization.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/serialization.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/serialization.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/test.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/test.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/test.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/test.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/testpreparer.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/testpreparer.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/testpreparer.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/testpreparer.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/types.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/types.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/types.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/types.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/validation.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/validation.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/validation.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/validation.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/vendor.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/vendor.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/vendor.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/vendor.py.jinja2
diff --git a/packages/autorest.python/autorest/codegen/templates/version.py.jinja2 b/packages/typespec-python/generator/pygen/codegen/templates/version.py.jinja2
similarity index 100%
rename from packages/autorest.python/autorest/codegen/templates/version.py.jinja2
rename to packages/typespec-python/generator/pygen/codegen/templates/version.py.jinja2
diff --git a/packages/autorest.python/autorest/m2r/__init__.py b/packages/typespec-python/generator/pygen/m2r.py
similarity index 85%
rename from packages/autorest.python/autorest/m2r/__init__.py
rename to packages/typespec-python/generator/pygen/m2r.py
index 88ea00c7f16..d709863e7c4 100644
--- a/packages/autorest.python/autorest/m2r/__init__.py
+++ b/packages/typespec-python/generator/pygen/m2r.py
@@ -3,21 +3,21 @@
 # Licensed under the MIT License. See License.txt in the project root for
 # license information.
 # --------------------------------------------------------------------------
-"""An autorest MD to RST plugin.
+"""An MD to RST plugin.
 """
 import logging
 from typing import Any, Dict, Set, Union
 
 import m2r2
 
-from .. import YamlUpdatePluginAutorest, YamlUpdatePlugin
-from .._utils import parse_args
+from . import YamlUpdatePlugin
+from .utils import parse_args
 
 
 _LOGGER = logging.getLogger(__name__)
 
 
-class AutorestRender(m2r2.RestRenderer):
+class GeneratorRenderer(m2r2.RestRenderer):
     """Redefine the concept of inline HTML in the renderer, we don't want to define a new format
     in the description/summary.
     """
@@ -54,16 +54,11 @@ def _convert_docstring_no_cycles(self, yaml_data: Union[Dict[str, Any], str], no
     def convert_to_rst(string_to_convert: str) -> str:
         """Convert that string from MD to RST."""
         try:
-            return m2r2.convert(string_to_convert, renderer=AutorestRender()).strip()
+            return m2r2.convert(string_to_convert, renderer=GeneratorRenderer()).strip()
         except Exception:  # pylint: disable=broad-except
             return string_to_convert
 
 
-class M2RAutorest(YamlUpdatePluginAutorest, M2R):
-    def get_options(self) -> Dict[str, Any]:
-        return {}
-
-
 if __name__ == "__main__":
     # CADL pipeline will call this
     args, unknown_args = parse_args()
diff --git a/packages/autorest.python/autorest/postprocess/__init__.py b/packages/typespec-python/generator/pygen/postprocess/__init__.py
similarity index 96%
rename from packages/autorest.python/autorest/postprocess/__init__.py
rename to packages/typespec-python/generator/pygen/postprocess/__init__.py
index a0f16378cee..771177261cb 100644
--- a/packages/autorest.python/autorest/postprocess/__init__.py
+++ b/packages/typespec-python/generator/pygen/postprocess/__init__.py
@@ -12,7 +12,7 @@
 from black.report import NothingChanged
 from .venvtools import ExtendedEnvBuilder, python_run
 
-from .. import Plugin, PluginAutorest
+from .. import Plugin
 
 _BLACK_MODE = black.Mode()  # pyright: ignore [reportPrivateImportUsage]
 _BLACK_MODE.line_length = 120
@@ -181,8 +181,3 @@ def fix_imports_in_init(self, generated_file_name: str, folder_path: Path, names
             file_content = file_content.replace("__all__ = [", f"__all__ = [\n{added_objs_all}", 1)
         formatted_file = format_file(file, file_content)
         self.write_file(file, formatted_file)
-
-
-class PostProcessPluginAutorest(PostProcessPlugin, PluginAutorest):
-    def get_options(self) -> Dict[str, Any]:
-        return {"outputFolderUri": self._autorestapi.get_value("outputFolderUri")}
diff --git a/packages/autorest.python/autorest/postprocess/get_all.py b/packages/typespec-python/generator/pygen/postprocess/get_all.py
similarity index 100%
rename from packages/autorest.python/autorest/postprocess/get_all.py
rename to packages/typespec-python/generator/pygen/postprocess/get_all.py
diff --git a/packages/autorest.python/autorest/postprocess/venvtools.py b/packages/typespec-python/generator/pygen/postprocess/venvtools.py
similarity index 100%
rename from packages/autorest.python/autorest/postprocess/venvtools.py
rename to packages/typespec-python/generator/pygen/postprocess/venvtools.py
diff --git a/packages/autorest.python/autorest/preprocess/__init__.py b/packages/typespec-python/generator/pygen/preprocess/__init__.py
similarity index 97%
rename from packages/autorest.python/autorest/preprocess/__init__.py
rename to packages/typespec-python/generator/pygen/preprocess/__init__.py
index a38719ac4d7..7c6002f1b43 100644
--- a/packages/autorest.python/autorest/preprocess/__init__.py
+++ b/packages/typespec-python/generator/pygen/preprocess/__init__.py
@@ -8,7 +8,7 @@
 import copy
 from typing import Callable, Dict, Any, List, Optional
 
-from .._utils import to_snake_case
+from ..utils import to_snake_case
 from .helpers import (
     add_redefined_builtin_info,
     pad_builtin_namespaces,
@@ -16,8 +16,8 @@
 )
 from .python_mappings import CADL_RESERVED_WORDS, RESERVED_WORDS, PadType
 
-from .. import YamlUpdatePlugin, YamlUpdatePluginAutorest
-from .._utils import parse_args, get_body_type_for_description, JSON_REGEXP, KNOWN_TYPES, update_enum_value
+from .. import YamlUpdatePlugin
+from ..utils import parse_args, get_body_type_for_description, JSON_REGEXP, KNOWN_TYPES, update_enum_value
 
 
 def update_overload_section(
@@ -497,16 +497,6 @@ def update_yaml(self, yaml_data: Dict[str, Any]) -> None:
             yaml_data["namespace"] = pad_builtin_namespaces(yaml_data["namespace"])
 
 
-class PreProcessPluginAutorest(YamlUpdatePluginAutorest, PreProcessPlugin):
-    def get_options(self) -> Dict[str, Any]:
-        options = {
-            "version-tolerant": self._autorestapi.get_boolean_value("version-tolerant"),
-            "azure-arm": self._autorestapi.get_boolean_value("azure-arm"),
-            "models-mode": self._autorestapi.get_value("models-mode"),
-        }
-        return {k: v for k, v in options.items() if v is not None}
-
-
 if __name__ == "__main__":
     # CADL pipeline will call this
     args, unknown_args = parse_args()
diff --git a/packages/autorest.python/autorest/preprocess/helpers.py b/packages/typespec-python/generator/pygen/preprocess/helpers.py
similarity index 100%
rename from packages/autorest.python/autorest/preprocess/helpers.py
rename to packages/typespec-python/generator/pygen/preprocess/helpers.py
diff --git a/packages/autorest.python/autorest/preprocess/python_mappings.py b/packages/typespec-python/generator/pygen/preprocess/python_mappings.py
similarity index 98%
rename from packages/autorest.python/autorest/preprocess/python_mappings.py
rename to packages/typespec-python/generator/pygen/preprocess/python_mappings.py
index d83df4793be..4edebd7120b 100644
--- a/packages/autorest.python/autorest/preprocess/python_mappings.py
+++ b/packages/typespec-python/generator/pygen/preprocess/python_mappings.py
@@ -112,7 +112,7 @@ class PadType(str, Enum):
     PadType.METHOD: [*_always_reserved],
     PadType.PARAMETER: [
         "self",
-        # these are kwargs we've reserved for our autorest generated operations
+        # these are kwargs we've reserved for our generated operations
         "content_type",
         "accept",
         "cls",
diff --git a/packages/autorest.python/autorest/_utils.py b/packages/typespec-python/generator/pygen/utils.py
similarity index 100%
rename from packages/autorest.python/autorest/_utils.py
rename to packages/typespec-python/generator/pygen/utils.py
diff --git a/packages/typespec-python/generator/requirements.txt b/packages/typespec-python/generator/requirements.txt
new file mode 100644
index 00000000000..bebbbb5a645
--- /dev/null
+++ b/packages/typespec-python/generator/requirements.txt
@@ -0,0 +1,12 @@
+black==24.4.0
+click==8.1.3
+docutils==0.19
+Jinja2==3.1.4
+m2r2==0.3.3
+MarkupSafe==2.1.2
+mistune==0.8.4
+pathspec==0.11.1
+platformdirs==3.2.0
+PyYAML==6.0.1
+tomli==2.0.1
+setuptools==69.2.0
diff --git a/packages/typespec-python/generator/setup.py b/packages/typespec-python/generator/setup.py
new file mode 100644
index 00000000000..b19d4f2692e
--- /dev/null
+++ b/packages/typespec-python/generator/setup.py
@@ -0,0 +1,55 @@
+#!/usr/bin/env python
+
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+
+
+import os
+import re
+
+from setuptools import setup, find_packages
+
+
+# Version extraction inspired from 'requests'
+with open(os.path.join("pygen", "_version.py"), "r") as fd:
+    version = re.search(r'^VERSION\s*=\s*[\'"]([^\'"]*)[\'"]', fd.read(), re.MULTILINE).group(1)
+
+if not version:
+    raise RuntimeError("Cannot find version information")
+
+setup(
+    name="pygen",
+    version=version,
+    description="Core Library for Python Generation",
+    long_description=open("README.md", "r").read(),
+    long_description_content_type="text/markdown",
+    license="MIT License",
+    author="Microsoft Corporation",
+    author_email="azpysdkhelp@microsoft.com",
+    url="https://github.com/Azure/autorest.python/packages/core",
+    classifiers=[
+        "Development Status :: 4 - Beta",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
+        "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "License :: OSI Approved :: MIT License",
+    ],
+    packages=find_packages(
+        exclude=[
+            "test",
+        ]
+    ),
+    install_requires=[
+        "Jinja2 >= 2.11",  # I need "include" and auto-context + blank line are not indented by default
+        "pyyaml",
+        "m2r2",
+        "black",
+    ],
+)
diff --git a/packages/typespec-python/package.json b/packages/typespec-python/package.json
index 4ba8106e223..86750dde6de 100644
--- a/packages/typespec-python/package.json
+++ b/packages/typespec-python/package.json
@@ -33,13 +33,15 @@
     "test": "mocha",
     "test-official": "c8 mocha --forbid-only",
     "lint": "eslint . --ext .ts --max-warnings=0",
-    "lint:fix": "eslint . --fix --ext .ts"
+    "lint:fix": "eslint . --fix --ext .ts",
+    "install": "node ./scripts/run-python3.cjs ./scripts/install.py",
+    "prepare": "node ./scripts/run-python3.cjs ./scripts/prepare.py"
   },
   "files": [
-    "lib/*.cadl",
     "dist/**",
     "!dist/test/**",
-    "get-autorest-python-path.cjs"
+    "generator/**",
+    "scripts/**"
   ],
   "peerDependencies": {
     "@azure-tools/typespec-azure-core": ">=0.43.0 <1.0.0",
@@ -58,9 +60,11 @@
     }
   },
   "dependencies": {
-    "@autorest/python": "workspace:^",
     "js-yaml": "~4.1.0",
-    "@typespec/openapi3": "~0.57.0"
+    "@typespec/openapi3": "~0.57.0",
+    "@autorest/system-requirements": "~1.0.2",
+    "fs-extra": "~11.2.0",
+    "semver": "~7.6.2"
   },
   "devDependencies": {
     "@azure-tools/typespec-azure-resource-manager": "~0.43.0",
diff --git a/packages/typespec-python/scripts/install.py b/packages/typespec-python/scripts/install.py
new file mode 100644
index 00000000000..415ac9455d6
--- /dev/null
+++ b/packages/typespec-python/scripts/install.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import sys
+
+if not sys.version_info >= (3, 8, 0):
+    raise Exception("Autorest for Python extension requires Python 3.8 at least")
+
+try:
+    import pip
+except ImportError:
+    raise Exception("Your Python installation doesn't have pip available")
+
+try:
+    import venv
+except ImportError:
+    raise Exception("Your Python installation doesn't have venv available")
+
+
+# Now we have pip and Py >= 3.8, go to work
+
+from pathlib import Path
+
+from venvtools import ExtendedEnvBuilder, python_run
+
+_ROOT_DIR = Path(__file__).parent.parent
+
+
+def main():
+    venv_path = _ROOT_DIR / "venv"
+    if venv_path.exists():
+        env_builder = venv.EnvBuilder(with_pip=True)
+        venv_context = env_builder.ensure_directories(venv_path)
+    else:
+        env_builder = ExtendedEnvBuilder(with_pip=True, upgrade_deps=True)
+        env_builder.create(venv_path)
+        venv_context = env_builder.context
+
+        python_run(venv_context, "pip", ["install", "-U", "pip"])
+        python_run(venv_context, "pip", ["install", "-r", f"{_ROOT_DIR}/generator/requirements.txt"])
+        python_run(venv_context, "pip", ["install", "-e", f"{_ROOT_DIR}/generator"])
+
+
+if __name__ == "__main__":
+    main()
diff --git a/packages/typespec-python/scripts/prepare.py b/packages/typespec-python/scripts/prepare.py
new file mode 100644
index 00000000000..f01a5256676
--- /dev/null
+++ b/packages/typespec-python/scripts/prepare.py
@@ -0,0 +1,38 @@
+#!/usr/bin/env python
+
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+import sys
+import os
+import argparse
+
+if not sys.version_info >= (3, 8, 0):
+    raise Exception("Autorest for Python extension requires Python 3.8 at least")
+
+from pathlib import Path
+import venv
+
+from venvtools import python_run
+
+_ROOT_DIR = Path(__file__).parent.parent
+
+
+def main():
+    venv_path = _ROOT_DIR / "venv"
+    venv_prexists = venv_path.exists()
+
+    assert venv_prexists  # Otherwise install was not done
+
+    env_builder = venv.EnvBuilder(with_pip=True)
+    venv_context = env_builder.ensure_directories(venv_path)
+    try:
+        python_run(venv_context, "pip", ["install", "-r", f"{_ROOT_DIR}/generator/dev_requirements.txt"])
+    except FileNotFoundError as e:
+        raise ValueError(e.filename)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/packages/typespec-python/scripts/run-python3.cjs b/packages/typespec-python/scripts/run-python3.cjs
new file mode 100644
index 00000000000..6059b4cce09
--- /dev/null
+++ b/packages/typespec-python/scripts/run-python3.cjs
@@ -0,0 +1,22 @@
+// This script wraps logic in @azure-tools/extension to resolve
+// the path to Python 3 so that a Python script file can be run
+// from an npm script in package.json.  It uses the same Python 3
+// path resolution algorithm as AutoRest so that the behavior
+// is fully consistent (and also supports AUTOREST_PYTHON_EXE).
+//
+// Invoke it like so: "node run-python3.cjs script.py"
+
+const cp = require("child_process");
+const extension = require("./system-requirements.cjs");
+
+async function runPython3(scriptName, ...args) {
+    const command = await extension.patchPythonPath(["python", scriptName, ...args], { version: ">=3.8", environmentVariable: "AUTOREST_PYTHON_EXE" });
+    cp.execSync(command.join(" "), {
+      stdio: [0, 1, 2]
+    });
+  }
+  
+  runPython3(...process.argv.slice(2)).catch(err => {
+    console.error(err.toString());
+    process.exit(1);
+  });
diff --git a/packages/autorest.python/run_cadl.py b/packages/typespec-python/scripts/run_tsp.py
similarity index 77%
rename from packages/autorest.python/run_cadl.py
rename to packages/typespec-python/scripts/run_tsp.py
index acc4404a90d..0cb34ee9277 100644
--- a/packages/autorest.python/run_cadl.py
+++ b/packages/typespec-python/scripts/run_tsp.py
@@ -9,7 +9,7 @@
 from pathlib import Path
 from venvtools import python_run
 
-_ROOT_DIR = Path(__file__).parent
+_ROOT_DIR = Path(__file__).parent.parent
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -34,7 +34,7 @@
         breakpoint()  # pylint: disable=undefined-variable
 
     # run m2r
-    python_run(venv_context, "autorest.m2r.__init__", command=sys.argv[1:])
-    python_run(venv_context, "autorest.preprocess.__init__", command=sys.argv[1:])
-    python_run(venv_context, "autorest.codegen.__init__", command=sys.argv[1:])
-    python_run(venv_context, "autorest.black.__init__", command=sys.argv[1:])
+    python_run(venv_context, "generator.pygen.m2r", command=sys.argv[1:])
+    python_run(venv_context, "generator.pygen.preprocess.__init__", command=sys.argv[1:])
+    python_run(venv_context, "generator.pygen.codegen.__init__", command=sys.argv[1:])
+    python_run(venv_context, "generator.pygen.black", command=sys.argv[1:])
diff --git a/packages/typespec-python/scripts/system-requirements.cjs b/packages/typespec-python/scripts/system-requirements.cjs
new file mode 100644
index 00000000000..2b7ced2c400
--- /dev/null
+++ b/packages/typespec-python/scripts/system-requirements.cjs
@@ -0,0 +1,180 @@
+const semver = require("semver");
+const child_process = require("child_process");
+
+/*
+ * Copied from @autorest/system-requirements
+ */
+
+const PythonRequirement = "python";
+const PRINT_PYTHON_VERSION_SCRIPT = "import sys; print('.'.join(map(str, sys.version_info[:3])))";
+
+
+function execute(command, cmdlineargs, options = {}) {
+    return new Promise((resolve, reject) => {
+    const cp = child_process.spawn(command, cmdlineargs, { ...options, stdio: "pipe", shell: true });
+    if (options.onCreate) {
+        options.onCreate(cp);
+    }
+
+    options.onStdOutData ? cp.stdout.on("data", options.onStdOutData) : cp;
+    options.onStdErrData ? cp.stderr.on("data", options.onStdErrData) : cp;
+
+    let err = "";
+    let out = "";
+    let all = "";
+    cp.stderr.on("data", (chunk) => {
+        err += chunk;
+        all += chunk;
+    });
+    cp.stdout.on("data", (chunk) => {
+        out += chunk;
+        all += chunk;
+    });
+
+    cp.on("error", (err) => {
+        reject(err);
+    });
+    cp.on("close", (code, signal) =>
+        resolve({
+        stdout: out,
+        stderr: err,
+        log: all,
+        error: code ? new Error("Process Failed.") : null,
+        code,
+        }),
+    );
+    });
+};
+
+function versionIsSatisfied(version, requirement) {
+    const cleanedVersion = semver.coerce(version);
+  if (!cleanedVersion) {
+    throw new Error(`Invalid version ${version}.`);
+  }
+  return semver.satisfies(cleanedVersion, requirement, true);
+};
+
+/**
+ * Validate the provided system requirement resolution is satisfying the version requirement if applicable.
+ * @param resolution Command resolution.
+ * @param actualVersion Version for that resolution.
+ * @param requirement Requirement.
+ * @returns the resolution if it is valid or an @see SystemRequirementError if not.
+ */
+function validateVersionRequirement(resolution, actualVersion, requirement) {
+    if (!requirement.version) {
+        return resolution; // No version requirement.
+      }
+    
+      try {
+        if (versionIsSatisfied(actualVersion, requirement.version)) {
+          return resolution;
+        }
+        return {
+          ...resolution,
+          error: true,
+          message: `'${resolution.command}' version is '${actualVersion}' but doesn't satisfy requirement '${requirement.version}'. Please update.`,
+          actualVersion: actualVersion,
+          neededVersion: requirement.version,
+        };
+      } catch {
+        return {
+          ...resolution,
+          error: true,
+          message: `Couldn't parse the version ${actualVersion}. This is not a valid semver version.`,
+          actualVersion: actualVersion,
+          neededVersion: requirement.version,
+        };
+      }
+};
+
+async function tryPython(requirement, command, additionalArgs = []) {
+    const resolution = {
+        name: PythonRequirement,
+        command,
+        additionalArgs: additionalArgs.length > 0 ? additionalArgs : undefined,
+      };
+    
+      try {
+        const result = await execute(command, [...additionalArgs, "-c", `"${PRINT_PYTHON_VERSION_SCRIPT}"`]);
+        return validateVersionRequirement(resolution, result.stdout.trim(), requirement);
+      } catch (e) {
+        return {
+          error: true,
+          ...resolution,
+          message: `'${command}' command line is not found in the path. Make sure to have it installed.`,
+        };
+      }
+};
+
+/**
+ * Returns the path to the executable as asked in the requirement.
+ * @param requirement System requirement definition.
+ * @returns If the requirement provide an environment variable for the path returns the value of that environment variable. undefined otherwise.
+ */
+function getExecutablePath(requirement) {
+    return requirement.environmentVariable && process.env[requirement.environmentVariable];
+}
+
+function createPythonErrorMessage(requirement, errors) {
+    const versionReq = requirement.version ?? "*";
+    const lines = [
+        `Couldn't find a valid python interpreter satisfying the requirement (version: ${versionReq}). Tried:`,
+        ...errors.map((x) => ` - ${x.command} (${x.message})`),
+    ];
+
+    return {
+        error: true,
+        name: "python",
+        command: "python",
+        message: lines.join("\n"),
+    };
+};
+
+async function resolvePythonRequirement(requirement) {
+    const path = getExecutablePath(requirement) ?? process.env["AUTOREST_PYTHON_EXE"];
+    if (path) {
+        return await tryPython(requirement, path);
+    }
+
+    const errors = [];
+    // On windows try `py` executable with `-3` flag.
+    if (process.platform === "win32") {
+        const pyResult = await tryPython(requirement, "py", ["-3"]);
+        if ("error" in pyResult) {
+        errors.push(pyResult);
+        } else {
+        return pyResult;
+        }
+    }
+
+    const python3Result = await tryPython(requirement, "python3");
+    if ("error" in python3Result) {
+        errors.push(python3Result);
+    } else {
+        return python3Result;
+    }
+
+    const pythonResult = await tryPython(requirement, "python");
+    if ("error" in pythonResult) {
+        errors.push(pythonResult);
+    } else {
+        return pythonResult;
+    }
+
+    return createPythonErrorMessage(requirement, errors);
+};
+
+/**
+ * @param command list of the command and arguments. First item in array must be a python exe @see KnownPythonExe. (e.g. ["python", "mypythonfile.py"]
+ * @param requirement
+ */
+async function patchPythonPath(command, requirement) {
+    const [_, ...args] = command;
+    const resolution = await resolvePythonRequirement(requirement);
+    if ("error" in resolution) {
+        throw new Error(`Failed to find compatible python version. ${resolution.message}`);
+    }
+    return [resolution.command, ...(resolution.additionalArgs ?? []), ...args];
+};
+module.exports.patchPythonPath = patchPythonPath;
diff --git a/packages/typespec-python/scripts/venvtools.py b/packages/typespec-python/scripts/venvtools.py
new file mode 100644
index 00000000000..944ff96e36b
--- /dev/null
+++ b/packages/typespec-python/scripts/venvtools.py
@@ -0,0 +1,81 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for
+# license information.
+# --------------------------------------------------------------------------
+from contextlib import contextmanager
+import tempfile
+import subprocess
+import venv
+import sys
+from pathlib import Path
+
+
+_ROOT_DIR = Path(__file__).parent.parent
+
+
+class ExtendedEnvBuilder(venv.EnvBuilder):
+    """An extended env builder which saves the context, to have access
+    easily to bin path and such.
+    """
+
+    def __init__(self, *args, **kwargs):
+        self.context = None
+        if sys.version_info < (3, 9, 0):
+            # Not supported on Python 3.8, and we don't need it
+            kwargs.pop("upgrade_deps", None)
+        super().__init__(*args, **kwargs)
+
+    def ensure_directories(self, env_dir):
+        self.context = super(ExtendedEnvBuilder, self).ensure_directories(env_dir)
+        return self.context
+
+
+def create(
+    env_dir, system_site_packages=False, clear=False, symlinks=False, with_pip=False, prompt=None, upgrade_deps=False
+):
+    """Create a virtual environment in a directory."""
+    builder = ExtendedEnvBuilder(
+        system_site_packages=system_site_packages,
+        clear=clear,
+        symlinks=symlinks,
+        with_pip=with_pip,
+        prompt=prompt,
+        upgrade_deps=upgrade_deps,
+    )
+    builder.create(env_dir)
+    return builder.context
+
+
+@contextmanager
+def create_venv_with_package(packages):
+    """Create a venv with these packages in a temp dir and yielf the env.
+
+    packages should be an iterable of pip version instructio (e.g. package~=1.2.3)
+    """
+    with tempfile.TemporaryDirectory() as tempdir:
+        myenv = create(tempdir, with_pip=True, upgrade_deps=True)
+        pip_call = [
+            myenv.env_exe,
+            "-m",
+            "pip",
+            "install",
+        ]
+        subprocess.check_call(pip_call + ["-U", "pip"])
+        if packages:
+            subprocess.check_call(pip_call + packages)
+        yield myenv
+
+
+def python_run(venv_context, module, command=None, *, additional_dir="."):
+    try:
+        cmd_line = [venv_context.env_exe, "-m", module] + (command if command else [])
+        print("Executing: {}".format(" ".join(cmd_line)))
+        subprocess.run(
+            cmd_line,
+            cwd=_ROOT_DIR / additional_dir,
+            check=True,
+        )
+    except subprocess.CalledProcessError as err:
+        print(err)
+        sys.exit(1)
diff --git a/packages/typespec-python/src/emitter.ts b/packages/typespec-python/src/emitter.ts
index cc376200ab9..bbe4b8d2b77 100644
--- a/packages/typespec-python/src/emitter.ts
+++ b/packages/typespec-python/src/emitter.ts
@@ -5,13 +5,14 @@ import {
     SdkHttpOperation,
     SdkServiceOperation,
 } from "@azure-tools/typespec-client-generator-core";
-import { resolveModuleRoot, saveCodeModelAsYaml } from "./external-process.js";
+import { saveCodeModelAsYaml } from "./external-process.js";
 import { dirname } from "path";
 import { fileURLToPath } from "url";
 import { execFileSync } from "child_process";
 import { PythonEmitterOptions, PythonSdkContext } from "./lib.js";
 import { emitCodeModel } from "./code-model.js";
 import { removeUnderscoresFromNamespace } from "./utils.js";
+import path from "path";
 
 export function getModelsMode(context: SdkContext): "dpg" | "none" {
     const specifiedModelsMode = context.emitContext.options["models-mode"];
@@ -66,14 +67,14 @@ function createPythonSdkContext<TServiceOperation extends SdkServiceOperation>(
 export async function $onEmit(context: EmitContext<PythonEmitterOptions>) {
     const program = context.program;
     const sdkContext = createPythonSdkContext<SdkHttpOperation>(context);
-    const root = await resolveModuleRoot(program, "@autorest/python", dirname(fileURLToPath(import.meta.url)));
+    const root = path.join(dirname(fileURLToPath(import.meta.url)), "..", "..");
     const outputDir = context.emitterOutputDir;
     const yamlMap = emitCodeModel(sdkContext);
     addDefaultOptions(sdkContext);
     const yamlPath = await saveCodeModelAsYaml("typespec-python-yaml-map", yamlMap);
     const commandArgs = [
-        `${root}/run-python3.js`,
-        `${root}/run_cadl.py`,
+        `${root}/scripts/run-python3.cjs`,
+        `${root}/scripts/run_tsp.py`,
         `--output-folder=${outputDir}`,
         `--cadl-file=${yamlPath}`,
     ];
diff --git a/packages/typespec-python/src/external-process.ts b/packages/typespec-python/src/external-process.ts
index 74eb017c1cf..bb2719aed0f 100644
--- a/packages/typespec-python/src/external-process.ts
+++ b/packages/typespec-python/src/external-process.ts
@@ -1,4 +1,4 @@
-import { CompilerHost, joinPaths, Program, resolveModule, ResolveModuleHost } from "@typespec/compiler";
+import { joinPaths } from "@typespec/compiler";
 import { ChildProcess, spawn, SpawnOptions } from "child_process";
 import { randomUUID } from "crypto";
 import { mkdir, writeFile } from "fs/promises";
@@ -50,31 +50,3 @@ export async function execAsync(
         });
     });
 }
-
-/**
- * Resolve root of module.
- * @param program Cadl Program
- * @param name Name of the module (e.g. "@autorest/python")
- * @param baseDir Base directory to start looking from. Use `dirname(fileURLToPath(import.meta.url))` for current dir.
- * @returns Path to the module root if found.
- */
-export async function resolveModuleRoot(program: Program, name: string, baseDir: string): Promise<string> {
-    const moduleHost = getResolveModuleHost(program.host);
-
-    const resolved = await resolveModule(moduleHost, name, {
-        baseDir,
-    });
-
-    return resolved.path;
-}
-
-function getResolveModuleHost(host: CompilerHost): ResolveModuleHost {
-    return {
-        realpath: host.realpath,
-        stat: host.stat,
-        readFile: async (path) => {
-            const file = await host.readFile(path);
-            return file.text;
-        },
-    };
-}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index a3f172a8b6f..b57afdba416 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -1,9 +1,5 @@
 lockfileVersion: '6.0'
 
-settings:
-  autoInstallPeers: true
-  excludeLinksFromLockfile: false
-
 importers:
 
   .:
@@ -50,7 +46,13 @@ importers:
       '@autorest/system-requirements':
         specifier: ~1.0.2
         version: 1.0.2
+      fs-extra:
+        specifier: ~11.2.0
+        version: 11.2.0
     devDependencies:
+      '@azure-tools/typespec-python':
+        specifier: workspace:^
+        version: link:../typespec-python
       '@microsoft.azure/autorest.testserver':
         specifier: ^3.3.46
         version: 3.3.46
@@ -60,15 +62,21 @@ importers:
 
   packages/typespec-python:
     dependencies:
-      '@autorest/python':
-        specifier: workspace:^
-        version: link:../autorest.python
+      '@autorest/system-requirements':
+        specifier: ~1.0.2
+        version: 1.0.2
       '@typespec/openapi3':
         specifier: ~0.57.0
         version: 0.57.0(@typespec/compiler@0.57.0)(@typespec/http@0.57.0)(@typespec/openapi@0.57.0)(@typespec/versioning@0.57.0)
+      fs-extra:
+        specifier: ~11.2.0
+        version: 11.2.0
       js-yaml:
         specifier: ~4.1.0
         version: 4.1.0
+      semver:
+        specifier: ~7.6.2
+        version: 7.6.2
     devDependencies:
       '@azure-tools/cadl-ranch-expect':
         specifier: ~0.14.0
@@ -163,7 +171,7 @@ packages:
     dependencies:
       '@azure/logger': 1.0.4
       command-exists: 1.2.9
-      semver: 7.5.4
+      semver: 7.6.2
     dev: false
 
   /@azure-tools/cadl-ranch-api@0.4.3:
@@ -584,6 +592,7 @@ packages:
     engines: {node: '>=14.0.0'}
     dependencies:
       tslib: 2.6.2
+    dev: false
 
   /@azure/logger@1.1.1:
     resolution: {integrity: sha512-/+4TtokaGgC+MnThdf6HyIH9Wrjp+CnCn3Nx3ggevN7FFjjNyjqg0yLlc2i9S+Z2uAzI8GYOo35Nzb1MhQ89MA==}
@@ -622,7 +631,7 @@ packages:
       '@azure/core-lro': 2.5.4
       '@azure/core-paging': 1.5.0
       '@azure/core-tracing': 1.0.0-preview.13
-      '@azure/logger': 1.0.4
+      '@azure/logger': 1.1.1
       events: 3.3.0
       tslib: 2.6.2
     transitivePeerDependencies:
@@ -3472,6 +3481,15 @@ packages:
       universalify: 2.0.1
     dev: true
 
+  /fs-extra@11.2.0:
+    resolution: {integrity: sha512-PmDi3uwK5nFuXh7XDTlVnS17xJS7vW36is2+w3xcv8SVxiB4NyATf4ctkVY5bkSjX0Y4nbvZCq1/EjtEyr9ktw==}
+    engines: {node: '>=14.14'}
+    dependencies:
+      graceful-fs: 4.2.11
+      jsonfile: 6.1.0
+      universalify: 2.0.1
+    dev: false
+
   /fs-minipass@2.1.0:
     resolution: {integrity: sha512-V/JgOLFCS+R6Vcq0slCuaeWEdNC3ouDlJMNIsacH2VtALiu9mV4LPrHc5cDl8k5aw6J8jwgWWpiTo5RYhmIzvg==}
     engines: {node: '>= 8'}
@@ -3662,7 +3680,6 @@ packages:
 
   /graceful-fs@4.2.11:
     resolution: {integrity: sha512-RbJ5/jmFcNNCcDV5o9eTnBLJ/HszWV0P73bc+Ff4nS/rJj+YaS6IGyiOL0VoBYX+l1Wrl3k63h/KrH+nhJ0XvQ==}
-    dev: true
 
   /graphemer@1.4.0:
     resolution: {integrity: sha512-EtKwoO6kxCL9WO5xipiHTZlSzBm7WLT627TqC/uVRd0HKmq8NXyebnNYxDoBi7wt8eTWrUrKXCOVaFq9x1kgag==}
@@ -4219,7 +4236,6 @@ packages:
       universalify: 2.0.1
     optionalDependencies:
       graceful-fs: 4.2.11
-    dev: true
 
   /jsonparse@1.3.1:
     resolution: {integrity: sha512-POQXvpdL69+CluYsillJ7SUhKvytYjW9vG/GKpnf+xP8UWgYEM/RaMzHHofbALDiKbbP1W8UEYmgGl39WkPZsg==}
@@ -4386,6 +4402,7 @@ packages:
     engines: {node: '>=10'}
     dependencies:
       yallist: 4.0.0
+    dev: true
 
   /make-dir@4.0.0:
     resolution: {integrity: sha512-hXdUTZYIVOt1Ex//jAQi+wTZZpUpwBj/0QsOzqegb3rGMMeJiSEu5xLHnYfBrRV4RH2+OCSOO95Is/7x1WJ4bw==}
@@ -5547,14 +5564,6 @@ packages:
       lru-cache: 6.0.0
     dev: true
 
-  /semver@7.5.4:
-    resolution: {integrity: sha512-1bCSESV6Pv+i21Hvpxp3Dx+pSD8lIPt8uVjRrxAUt/nbswYc+tK6Y2btiULjd4+fnq15PX+nqQDC7Oft7WkwcA==}
-    engines: {node: '>=10'}
-    hasBin: true
-    dependencies:
-      lru-cache: 6.0.0
-    dev: false
-
   /semver@7.6.0:
     resolution: {integrity: sha512-EnwXhrlwXMk9gKu5/flx5sv/an57AkRplG3hTK68W7FRDN+k+OWBj65M7719OkA82XLBxrcX0KSHj+X5COhOVg==}
     engines: {node: '>=10'}
@@ -6249,7 +6258,6 @@ packages:
   /universalify@2.0.1:
     resolution: {integrity: sha512-gptHNQghINnc/vTGIk0SOFGFNXw7JVrlRUtConJRlvaw6DuX0wO5Jeko9sWrMBhh+PsYAZ7oXAiOnf/UKogyiw==}
     engines: {node: '>= 10.0.0'}
-    dev: true
 
   /unpipe@1.0.0:
     resolution: {integrity: sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==}
@@ -6514,6 +6522,7 @@ packages:
 
   /yallist@4.0.0:
     resolution: {integrity: sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==}
+    dev: true
 
   /yaml@2.4.5:
     resolution: {integrity: sha512-aBx2bnqDzVOyNKfsysjA2ms5ZlnjSAW2eG3/L5G/CSujfjLJTJsEw1bGw8kCf04KodQWk1pxlGnZ56CRxiawmg==}
@@ -6585,3 +6594,7 @@ packages:
   /zod@3.23.8:
     resolution: {integrity: sha512-XBx9AXhXktjUqnepgTiE5flcKIYWi/rme0Eaj+5Y0lftuGBq+jyRu/md4WnuxqgP1ubdpNCsYEYPxrzVHD8d6g==}
     dev: true
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false