diff --git a/projects/jdwp/codegen/BUCK b/projects/jdwp/codegen/BUCK
new file mode 100644
index 0000000..1e63709
--- /dev/null
+++ b/projects/jdwp/codegen/BUCK
@@ -0,0 +1,19 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+
+python_binary(
+    name="generate-new-types",
+    main_module="projects.jdwp.codegen.new_type_generator",
+    deps=[
+        ":codegen",
+    ],
+    visibility=["//projects/jdwp/runtime/..."],
+)
+
+python_library(
+    name="codegen",
+    srcs=glob(["**/*.py"]),
+    deps=["//projects/jdwp/defs:defs"],
+    visibility=[
+        "PUBLIC",
+    ],
+)
diff --git a/projects/jdwp/codegen/new_type_generator.py b/projects/jdwp/codegen/new_type_generator.py
index 172d085..e034cdb 100644
--- a/projects/jdwp/codegen/new_type_generator.py
+++ b/projects/jdwp/codegen/new_type_generator.py
@@ -11,6 +11,11 @@ def get_type_alias_definition(jdwp_type: IdType) -> str:
 
 
 def generate_new_types():
+    print("import typing")
     for id_type in IdType:
         type_alias_definition = get_type_alias_definition(id_type)
         print(type_alias_definition)
+
+
+if "__main__" == __name__:
+    generate_new_types()
diff --git a/projects/jdwp/defs/BUCK b/projects/jdwp/defs/BUCK
new file mode 100644
index 0000000..55cb280
--- /dev/null
+++ b/projects/jdwp/defs/BUCK
@@ -0,0 +1,8 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+
+python_library(
+    name = "defs",
+    srcs = glob(["**/*.py"]),
+    visibility = ["PUBLIC"],
+    deps = [],
+)
diff --git a/projects/jdwp/runtime/BUCK b/projects/jdwp/runtime/BUCK
new file mode 100644
index 0000000..48f578c
--- /dev/null
+++ b/projects/jdwp/runtime/BUCK
@@ -0,0 +1,18 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+
+genrule(
+  name = "type-aliases",
+  out = "type_aliases.py",
+  cmd = "$(exe //projects/jdwp/codegen:generate-new-types) > $OUT",
+)
+
+python_library(
+  name = "runtime",
+  srcs = [
+    ":type-aliases",
+  ],
+  visibility = ["PUBLIC", ],
+  
+
+  deps = [],
+)
diff --git a/projects/jdwp/runtime/async_streams.py b/projects/jdwp/runtime/async_streams.py
new file mode 100644
index 0000000..98a5598
--- /dev/null
+++ b/projects/jdwp/runtime/async_streams.py
@@ -0,0 +1,181 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+
+import abc
+import typing
+
+from projects.jdwp.defs.schema import IdType
+
+
+class JDWPInputStreamBase(abc.ABC):
+    # Methods for OpaqueType
+    @abc.abstractmethod
+    async def read_boolean(self) -> bool:
+        pass
+
+    @abc.abstractmethod
+    async def read_location(self) -> typing.Any:
+        pass
+
+    @abc.abstractmethod
+    async def read_string(self) -> str:
+        pass
+
+    # Methods for IdType
+    @abc.abstractmethod
+    async def read_object_id(self) -> IdType.OBJECT_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_thread_id(self) -> IdType.THREAD_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_thread_group_id(self) -> IdType.THREAD_GROUP_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_string_id(self) -> IdType.STRING_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_class_loader_id(self) -> IdType.CLASS_LOADER_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_class_object_id(self) -> IdType.CLASS_OBJECT_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_array_id(self) -> IdType.ARRAY_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_reference_type_id(self) -> IdType.REFERENCE_TYPE_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_class_id(self) -> IdType.CLASS_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_interface_id(self) -> IdType.INTERFACE_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_array_type_id(self) -> IdType.ARRAY_TYPE_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_method_id(self) -> IdType.METHOD_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_field_id(self) -> IdType.FIELD_ID:
+        pass
+
+    @abc.abstractmethod
+    async def read_frame_id(self) -> IdType.FRAME_ID:
+        pass
+
+    # Methods for IntegralType
+    @abc.abstractmethod
+    async def read_byte(self) -> int:
+        pass
+
+    @abc.abstractmethod
+    async def read_int(self) -> int:
+        pass
+
+    @abc.abstractmethod
+    async def read_long(
+        self,
+    ) -> int:
+        pass
+
+
+class JDWPOutputStreamBase(abc.ABC):
+    # Methods for OpaqueType
+    @abc.abstractmethod
+    def write_boolean(self, value: bool) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_location(self, value: typing.Any) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_string(self, value: str) -> None:
+        pass
+
+    # Methods for IdType
+    @abc.abstractmethod
+    def write_object_id(self, value: IdType.OBJECT_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_thread_id(self, value: IdType.THREAD_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_thread_group_id(self, value: IdType.THREAD_GROUP_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_string_id(self, value: IdType.STRING_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_class_loader_id(self, value: IdType.CLASS_LOADER_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_class_object_id(self, value: IdType.CLASS_OBJECT_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_array_id(self, value: IdType.ARRAY_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_reference_type_id(self, value: IdType.REFERENCE_TYPE_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_class_id(self, value: IdType.CLASS_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_interface_id(self, value: IdType.INTERFACE_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_array_type_id(self, value: IdType.ARRAY_TYPE_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_method_id(self, value: IdType.METHOD_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_field_id(self, value: IdType.FIELD_ID) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_frame_id(self, value: IdType.FRAME_ID) -> None:
+        pass
+
+    # Methods for IntegralType
+    @abc.abstractmethod
+    def write_byte(self, value: int) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_int(self, value: int) -> None:
+        pass
+
+    @abc.abstractmethod
+    def write_long(
+        self,
+        value: int,
+    ) -> None:
+        pass
diff --git a/projects/jdwp/tests/BUCK b/projects/jdwp/tests/BUCK
index a3c6283..3769477 100644
--- a/projects/jdwp/tests/BUCK
+++ b/projects/jdwp/tests/BUCK
@@ -3,7 +3,10 @@
 python_test(
   name = "tests",
   deps = [
-    "//projects/jdwp:lib",
+    "//projects/jdwp/defs:defs",
+    "//projects/jdwp/codegen:codegen",
+
+
   ],
   srcs = glob(["**/*.py"]),
 )
diff --git a/toolchains/BUCK b/toolchains/BUCK
index 7f2730a..15362e2 100644
--- a/toolchains/BUCK
+++ b/toolchains/BUCK
@@ -2,6 +2,7 @@
 
 load("@prelude//toolchains:python.bzl", "system_python_bootstrap_toolchain", "system_python_toolchain")
 load("@prelude//toolchains:cxx.bzl", "system_cxx_toolchain")
+load("@prelude//toolchains:genrule.bzl", "system_genrule_toolchain")
 
 system_cxx_toolchain(
     name = "cxx",
@@ -13,6 +14,11 @@ system_python_toolchain(
     visibility = ["PUBLIC"],
 )
 
+system_genrule_toolchain(
+        name = "genrule",
+        visibility = ["PUBLIC"],
+    )
+
 system_python_bootstrap_toolchain(
     name = "python_bootstrap",
     visibility = ["PUBLIC"],