chore: enable pyupgrade fixes (#1806)

# What does this PR do?

The goal of this PR is code base modernization.

Schema reflection code needed a minor adjustment to handle UnionTypes
and collections.abc.AsyncIterator. (Both are preferred for latest Python
releases.)

Note to reviewers: almost all changes here are automatically generated
by pyupgrade. Some additional unused imports were cleaned up. The only
change worth of note can be found under `docs/openapi_generator` and
`llama_stack/strong_typing/schema.py` where reflection code was updated
to deal with "newer" types.

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

llama_stack/apis/tools/tools.py

@@ -5,7 +5,7 @@
 # the root directory of this source tree.
 
 from enum import Enum
-from typing import Any, Dict, List, Literal, Optional
+from typing import Any, Literal
 
 from pydantic import BaseModel, Field
 from typing_extensions import Protocol, runtime_checkable
@@ -24,7 +24,7 @@ class ToolParameter(BaseModel):
     parameter_type: str
     description: str
     required: bool = Field(default=True)
-    default: Optional[Any] = None
+    default: Any | None = None
 
 
 @json_schema_type
@@ -40,39 +40,39 @@ class Tool(Resource):
     toolgroup_id: str
     tool_host: ToolHost
     description: str
-    parameters: List[ToolParameter]
-    metadata: Optional[Dict[str, Any]] = None
+    parameters: list[ToolParameter]
+    metadata: dict[str, Any] | None = None
 
 
 @json_schema_type
 class ToolDef(BaseModel):
     name: str
-    description: Optional[str] = None
-    parameters: Optional[List[ToolParameter]] = None
-    metadata: Optional[Dict[str, Any]] = None
+    description: str | None = None
+    parameters: list[ToolParameter] | None = None
+    metadata: dict[str, Any] | None = None
 
 
 @json_schema_type
 class ToolGroupInput(BaseModel):
     toolgroup_id: str
     provider_id: str
-    args: Optional[Dict[str, Any]] = None
-    mcp_endpoint: Optional[URL] = None
+    args: dict[str, Any] | None = None
+    mcp_endpoint: URL | None = None
 
 
 @json_schema_type
 class ToolGroup(Resource):
     type: Literal[ResourceType.tool_group.value] = ResourceType.tool_group.value
-    mcp_endpoint: Optional[URL] = None
-    args: Optional[Dict[str, Any]] = None
+    mcp_endpoint: URL | None = None
+    args: dict[str, Any] | None = None
 
 
 @json_schema_type
 class ToolInvocationResult(BaseModel):
-    content: Optional[InterleavedContent] = None
-    error_message: Optional[str] = None
-    error_code: Optional[int] = None
-    metadata: Optional[Dict[str, Any]] = None
+    content: InterleavedContent | None = None
+    error_message: str | None = None
+    error_code: int | None = None
+    metadata: dict[str, Any] | None = None
 
 
 class ToolStore(Protocol):
@@ -81,11 +81,11 @@ class ToolStore(Protocol):
 
 
 class ListToolGroupsResponse(BaseModel):
-    data: List[ToolGroup]
+    data: list[ToolGroup]
 
 
 class ListToolsResponse(BaseModel):
-    data: List[Tool]
+    data: list[Tool]
 
 
 class ListToolDefsResponse(BaseModel):
@@ -100,8 +100,8 @@ class ToolGroups(Protocol):
         self,
         toolgroup_id: str,
         provider_id: str,
-        mcp_endpoint: Optional[URL] = None,
-        args: Optional[Dict[str, Any]] = None,
+        mcp_endpoint: URL | None = None,
+        args: dict[str, Any] | None = None,
     ) -> None:
         """Register a tool group"""
         ...
@@ -118,7 +118,7 @@ class ToolGroups(Protocol):
         ...
 
     @webmethod(route="/tools", method="GET")
-    async def list_tools(self, toolgroup_id: Optional[str] = None) -> ListToolsResponse:
+    async def list_tools(self, toolgroup_id: str | None = None) -> ListToolsResponse:
         """List tools with optional tool group"""
         ...
 
@@ -151,10 +151,10 @@ class ToolRuntime(Protocol):
     # TODO: This needs to be renamed once OPEN API generator name conflict issue is fixed.
     @webmethod(route="/tool-runtime/list-tools", method="GET")
     async def list_runtime_tools(
-        self, tool_group_id: Optional[str] = None, mcp_endpoint: Optional[URL] = None
+        self, tool_group_id: str | None = None, mcp_endpoint: URL | None = None
     ) -> ListToolDefsResponse: ...
 
     @webmethod(route="/tool-runtime/invoke", method="POST")
-    async def invoke_tool(self, tool_name: str, kwargs: Dict[str, Any]) -> ToolInvocationResult:
+    async def invoke_tool(self, tool_name: str, kwargs: dict[str, Any]) -> ToolInvocationResult:
         """Run a tool with the given arguments"""
         ...