diff --git a/src/examples/server/mcpServerOutputSchema.ts b/src/examples/server/mcpServerOutputSchema.ts
index 75bfe690..dce2d42e 100644
--- a/src/examples/server/mcpServerOutputSchema.ts
+++ b/src/examples/server/mcpServerOutputSchema.ts
@@ -43,7 +43,7 @@ server.registerTool(
     void country;
     // Simulate weather API call
     const temp_c = Math.round((Math.random() * 35 - 5) * 10) / 10;
-    const conditions = ["sunny", "cloudy", "rainy", "stormy", "snowy"][Math.floor(Math.random() * 5)];
+    const conditions = ["sunny", "cloudy", "rainy", "stormy", "snowy"][Math.floor(Math.random() * 5)] as unknown as "sunny" | "cloudy" | "rainy" | "stormy" | "snowy";
 
     const structuredContent = {
       temperature: {
@@ -77,4 +77,4 @@ async function main() {
 main().catch((error) => {
   console.error("Server error:", error);
   process.exit(1);
-});
\ No newline at end of file
+});
diff --git a/src/server/mcp.test.ts b/src/server/mcp.test.ts
index 7e299bb0..1a17d789 100644
--- a/src/server/mcp.test.ts
+++ b/src/server/mcp.test.ts
@@ -1248,6 +1248,7 @@ describe("tool()", () => {
           processedInput: input,
           resultType: "structured",
           // Missing required 'timestamp' field
+          someExtraField: "unexpected" // Extra field not in schema
         } as unknown as { processedInput: string; resultType: string; timestamp: string }, // Type assertion to bypass TypeScript validation for testing purposes
       })
     );