Add test coverage for ResourceAnnotations now that we can.

Author: fennb

tests/mcp_server.py

@@ -5,6 +5,7 @@
 from mcp.server.fastmcp import Context, FastMCP, Image
 from mcp.server.session import ServerSession
 from mcp.types import (
+    Annotations,
     BlobResourceContents,
     CreateMessageResult,
     EmbeddedResource,
@@ -120,7 +121,11 @@ async def get_product_name_link() -> ResourceLink:
     )
 
 
-@mcp.resource('resource://product_name.txt', mime_type='text/plain')
+@mcp.resource(
+    'resource://product_name.txt',
+    mime_type='text/plain',
+    annotations=Annotations(audience=['user', 'assistant'], priority=0.5),
+)
 async def product_name_resource() -> str:
     return Path(__file__).parent.joinpath('assets/product_name.txt').read_text()
 

tests/test_mcp.py

@@ -330,14 +330,20 @@ async def test_stdio_server_list_resources(run_context: RunContext[int]):
         assert resources[0].uri == snapshot('resource://kiwi.png')
         assert resources[0].mime_type == snapshot('image/png')
         assert resources[0].name == snapshot('kiwi_resource')
+        assert resources[0].annotations is None
 
         assert resources[1].uri == snapshot('resource://marcelo.mp3')
         assert resources[1].mime_type == snapshot('audio/mpeg')
         assert resources[1].name == snapshot('marcelo_resource')
+        assert resources[1].annotations is None
 
         assert resources[2].uri == snapshot('resource://product_name.txt')
         assert resources[2].mime_type == snapshot('text/plain')
         assert resources[2].name == snapshot('product_name_resource')
+        # Test ResourceAnnotations
+        assert resources[2].annotations is not None
+        assert resources[2].annotations.audience == snapshot(['user', 'assistant'])
+        assert resources[2].annotations.priority == snapshot(0.5)
 
 
 async def test_stdio_server_list_resource_templates(run_context: RunContext[int]):