diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9cb863d..f78ea06 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,12 +43,13 @@ jobs:
       - name: Run E2E tests with behave
         run: hatch run e2e
 
-      - name: Upload coverage to Codecov
+      - if: matrix.python-version == '3.11'
+        name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with:
           flags: unittests # optional
           name: coverage # optional
-          fail_ci_if_error: true # optional (default = false)
+          fail_ci_if_error: false # optional (default = false)
           verbose: true # optional (default = false)
 
   lint:
diff --git a/openfeature/api.py b/openfeature/api.py
index cbff4b6..c04d423 100644
--- a/openfeature/api.py
+++ b/openfeature/api.py
@@ -13,6 +13,21 @@ from openfeature.provider import FeatureProvider
 from openfeature.provider._registry import provider_registry
 from openfeature.provider.metadata import Metadata
 
+__all__ = [
+    "get_client",
+    "set_provider",
+    "clear_providers",
+    "get_provider_metadata",
+    "get_evaluation_context",
+    "set_evaluation_context",
+    "add_hooks",
+    "clear_hooks",
+    "get_hooks",
+    "shutdown",
+    "add_handler",
+    "remove_handler",
+]
+
 _evaluation_context = EvaluationContext()
 
 _hooks: typing.List[Hook] = []
diff --git a/openfeature/client.py b/openfeature/client.py
index c2203ca..0429911 100644
--- a/openfeature/client.py
+++ b/openfeature/client.py
@@ -30,6 +30,11 @@ from openfeature.hook._hook_support import (
 from openfeature.provider import FeatureProvider, ProviderStatus
 from openfeature.provider._registry import provider_registry
 
+__all__ = [
+    "ClientMetadata",
+    "OpenFeatureClient",
+]
+
 logger = logging.getLogger("openfeature")
 
 GetDetailCallable = typing.Union[
diff --git a/openfeature/evaluation_context.py b/openfeature/evaluation_context.py
index 829ada6..c3af350 100644
--- a/openfeature/evaluation_context.py
+++ b/openfeature/evaluation_context.py
@@ -1,6 +1,8 @@
 import typing
 from dataclasses import dataclass, field
 
+__all__ = ["EvaluationContext"]
+
 
 @dataclass
 class EvaluationContext:
diff --git a/openfeature/event.py b/openfeature/event.py
index 367e585..5fd64d2 100644
--- a/openfeature/event.py
+++ b/openfeature/event.py
@@ -7,6 +7,8 @@ from typing import Callable, ClassVar, Dict, List, Optional, Union
 from openfeature.exception import ErrorCode
 from openfeature.provider import ProviderStatus
 
+__all__ = ["ProviderEvent", "ProviderEventDetails", "EventDetails", "EventHandler"]
+
 
 class ProviderEvent(Enum):
     PROVIDER_READY = "PROVIDER_READY"
diff --git a/openfeature/exception.py b/openfeature/exception.py
index d17c28f..3ae54a5 100644
--- a/openfeature/exception.py
+++ b/openfeature/exception.py
@@ -4,6 +4,19 @@ import typing
 from collections.abc import Mapping
 from enum import Enum
 
+__all__ = [
+    "OpenFeatureError",
+    "ProviderNotReadyError",
+    "ProviderFatalError",
+    "FlagNotFoundError",
+    "GeneralError",
+    "ParseError",
+    "TypeMismatchError",
+    "TargetingKeyMissingError",
+    "InvalidContextError",
+    "ErrorCode",
+]
+
 
 class OpenFeatureError(Exception):
     """
diff --git a/openfeature/flag_evaluation.py b/openfeature/flag_evaluation.py
index 86233ed..db9cea1 100644
--- a/openfeature/flag_evaluation.py
+++ b/openfeature/flag_evaluation.py
@@ -11,6 +11,16 @@ if typing.TYPE_CHECKING:  # pragma: no cover
     from openfeature.hook import Hook, HookHints
 
 
+__all__ = [
+    "FlagType",
+    "Reason",
+    "FlagMetadata",
+    "FlagEvaluationDetails",
+    "FlagEvaluationOptions",
+    "FlagResolutionDetails",
+]
+
+
 class FlagType(StrEnum):
     BOOLEAN = "BOOLEAN"
     STRING = "STRING"
diff --git a/openfeature/hook/__init__.py b/openfeature/hook/__init__.py
index 8cb1c14..e1524ad 100644
--- a/openfeature/hook/__init__.py
+++ b/openfeature/hook/__init__.py
@@ -12,6 +12,8 @@ if TYPE_CHECKING:
     from openfeature.client import ClientMetadata
     from openfeature.provider.metadata import Metadata
 
+__all__ = ["HookType", "HookContext", "HookHints", "Hook"]
+
 
 class HookType(Enum):
     BEFORE = "before"
diff --git a/openfeature/provider/__init__.py b/openfeature/provider/__init__.py
index 30ed103..77111f2 100644
--- a/openfeature/provider/__init__.py
+++ b/openfeature/provider/__init__.py
@@ -7,6 +7,8 @@ from openfeature.hook import Hook
 
 from .metadata import Metadata
 
+__all__ = ["ProviderStatus", "FeatureProvider", "Metadata"]
+
 
 class ProviderStatus(Enum):
     NOT_READY = "NOT_READY"
diff --git a/openfeature/provider/provider.py b/openfeature/provider/provider.py
index debc1d5..9fc8594 100644
--- a/openfeature/provider/provider.py
+++ b/openfeature/provider/provider.py
@@ -8,6 +8,8 @@ from openfeature.hook import Hook
 from openfeature.provider import FeatureProvider
 from openfeature.provider.metadata import Metadata
 
+__all__ = ["AbstractProvider"]
+
 
 class AbstractProvider(FeatureProvider):
     def initialize(self, evaluation_context: EvaluationContext) -> None: