diff --git a/packages/mcp-server/test/protocol.test.ts b/packages/mcp-server/test/protocol.test.ts
index f760f1c..e6ba98c 100644
--- a/packages/mcp-server/test/protocol.test.ts
+++ b/packages/mcp-server/test/protocol.test.ts
@@ -72,7 +72,10 @@ describe("MCP protocol unstableFilter", () => {
       const tool = tools.find((t) => t.name === toolName);
       expect(tool).toBeDefined();
       expect(tool?.inputSchema.properties).toHaveProperty("unstableFilter");
-      const prop = tool?.inputSchema.properties.unstableFilter as any;
+      const prop = tool?.inputSchema.properties.unstableFilter as {
+        type: string;
+        description: string;
+      };
       expect(prop.type).toBe("boolean");
       expect(prop.description).toContain("optional");
       expect(prop.description).toContain("20%");