fix(mcp): clear prompt registry on refresh to prevent duplicates (#5385)

Co-authored-by: Jacob Richman <jacob314@gmail.com>
Co-authored-by: Sandy Tao <sandytao520@icloud.com>

packages/core/src/prompts/prompt-registry.ts

@@ -53,4 +53,22 @@ export class PromptRegistry {
     }
     return serverPrompts.sort((a, b) => a.name.localeCompare(b.name));
   }
+
+  /**
+   * Clears all the prompts from the registry.
+   */
+  clear(): void {
+    this.prompts.clear();
+  }
+
+  /**
+   * Removes all prompts from a specific server.
+   */
+  removePromptsByServer(serverName: string): void {
+    for (const [name, prompt] of this.prompts.entries()) {
+      if (prompt.serverName === serverName) {
+        this.prompts.delete(name);
+      }
+    }
+  }
 }