diff --git a/src/time/src/mcp_server_time/server.py b/src/time/src/mcp_server_time/server.py
index e10d6b4eed..83e97af333 100644
--- a/src/time/src/mcp_server_time/server.py
+++ b/src/time/src/mcp_server_time/server.py
@@ -8,7 +8,7 @@
 
 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 list_tools() -> list[Tool]:
                     },
                     "required": ["timezone"],
                 },
+                annotations=ToolAnnotations(
+                    readOnlyHint=True,
+                    destructiveHint=False,
+                    idempotentHint=True,
+                    openWorldHint=False,
+                ),
             ),
             Tool(
                 name=TimeTools.CONVERT_TIME.value,
@@ -164,6 +170,12 @@ async def list_tools() -> list[Tool]:
                     },
                     "required": ["source_timezone", "time", "target_timezone"],
                 },
+                annotations=ToolAnnotations(
+                    readOnlyHint=True,
+                    destructiveHint=False,
+                    idempotentHint=True,
+                    openWorldHint=False,
+                ),
             ),
         ]