fix(mcp): support resource content type in MCP tool output (#7879)

packages/opencode/src/session/prompt.ts

@@ -777,8 +777,23 @@ export namespace SessionPrompt {
               mime: contentItem.mimeType,
               url: `data:${contentItem.mimeType};base64,${contentItem.data}`,
             })
+          } else if (contentItem.type === "resource") {
+            const { resource } = contentItem
+            if (resource.text) {
+              textParts.push(resource.text)
+            }
+            if (resource.blob) {
+              attachments.push({
+                id: Identifier.ascending("part"),
+                sessionID: input.session.id,
+                messageID: input.processor.message.id,
+                type: "file",
+                mime: resource.mimeType ?? "application/octet-stream",
+                url: `data:${resource.mimeType ?? "application/octet-stream"};base64,${resource.blob}`,
+                filename: resource.uri,
+              })
+            }
           }
-          // Add support for other types if needed
         }
 
         return {