diff --git a/src/sequentialthinking/index.ts b/src/sequentialthinking/index.ts
index 1ae09d1db8..8be1f9a568 100644
--- a/src/sequentialthinking/index.ts
+++ b/src/sequentialthinking/index.ts
@@ -93,9 +93,9 @@ You should:
       needsMoreThoughts: coercedBoolean.optional().describe("If more thoughts are needed")
     },
     annotations: {
-      readOnlyHint: true,
+      readOnlyHint: false,
       destructiveHint: false,
-      idempotentHint: true,
+      idempotentHint: false,
       openWorldHint: false,
     },
     outputSchema: {