feat(time): add tool annotations to get_current_time and convert_time (#3574) (#3581)

feat(time): add tool annotations

Adds MCP ToolAnnotations to both time server tools (get_current_time, convert_time). Both are read-only, non-destructive, idempotent, and closed-world.

Fixes #3574

src/time/src/mcp_server_time/server.py

@@ -8,7 +8,7 @@ from tzlocal import get_localzone_name  # ← returns "Europe/Paris", etc.
 
 from mcp.server import Server
 from mcp.server.stdio import stdio_server
-from mcp.types import Tool, TextContent, ImageContent, EmbeddedResource, ErrorData, INVALID_PARAMS
+from mcp.types import Tool, ToolAnnotations, TextContent, ImageContent, EmbeddedResource, ErrorData, INVALID_PARAMS
 from mcp.shared.exceptions import McpError
 
 from pydantic import BaseModel
@@ -142,6 +142,12 @@ async def serve(local_timezone: str | None = None) -> None:
                     },
                     "required": ["timezone"],
                 },
+                annotations=ToolAnnotations(
+                    readOnlyHint=True,
+                    destructiveHint=False,
+                    idempotentHint=True,
+                    openWorldHint=False,
+                ),
             ),
             Tool(
                 name=TimeTools.CONVERT_TIME.value,
@@ -164,6 +170,12 @@ async def serve(local_timezone: str | None = None) -> None:
                     },
                     "required": ["source_timezone", "time", "target_timezone"],
                 },
+                annotations=ToolAnnotations(
+                    readOnlyHint=True,
+                    destructiveHint=False,
+                    idempotentHint=True,
+                    openWorldHint=False,
+                ),
             ),
         ]