Remove FastMCP server tags

src/fastmcp/server/server.py

@@ -121,7 +121,6 @@ class FastMCP(Generic[LifespanResultT]):
             ]
             | None
         ) = None,
-        tags: set[str] | None = None,
         tool_serializer: Callable[[Any], str] | None = None,
         cache_expiration_seconds: float | None = None,
         on_duplicate_tools: DuplicateBehavior | None = None,
@@ -152,8 +151,6 @@ class FastMCP(Generic[LifespanResultT]):
             resource_prefix_format or fastmcp.settings.resource_prefix_format
         )
 
-        self.tags: set[str] = tags or set()
-
         self._cache = TimedCache(
             expiration=datetime.timedelta(seconds=cache_expiration_seconds or 0)
         )

tests/deprecated/test_settings.py

@@ -175,7 +175,6 @@ class TestDeprecatedServerInitKwargs:
             server = FastMCP(
                 name="TestServer",
                 instructions="Test instructions",
-                tags={"test", "server"},
                 cache_expiration_seconds=60.0,
                 on_duplicate_tools="warn",
                 on_duplicate_resources="error",
@@ -193,7 +192,6 @@ class TestDeprecatedServerInitKwargs:
         # Verify server was created successfully
         assert server.name == "TestServer"
         assert server.instructions == "Test instructions"
-        assert server.tags == {"test", "server"}
 
     def test_none_values_no_warnings(self):
         """Test that None values for deprecated kwargs don't raise warnings."""