Merge pull request modelcontextprotocol#59 from jackdeansmith/clarify-resources-docs

Clarify that Claude Desktop does not automatically use resources

Author: dsp-ant

docs/concepts/resources.mdx

@@ -7,8 +7,12 @@ Resources are a core primitive in the Model Context Protocol (MCP) that allow se
 
 <Note>
   Resources are designed to be **application-controlled**, meaning that the client application can decide how and when they should be used.
+  Different MCP clients may handle resources differently. For example:
+  - Claude Desktop currently requires users to explicitly select resources before they can be used
+  - Other clients might automatically select resources based on heuristics
+  - Some implementations may even allow the AI model itself to determine which resources to use
 
-  For example, one application may require users to explicitly select resources, while another could automatically select them based on heuristics or even at the discretion of the AI model itself.
+  Server authors should be prepared to handle any of these interaction patterns when implementing resource support. In order to expose data to models automatically, server authors should use a **model-controlled** primitive such as [Tools](./tools).
 </Note>
 
 ## Overview