From c2ee97e792655f3452bb1c1066e58f90e036b147 Mon Sep 17 00:00:00 2001
From: Niels Kaspers <153818647+nielskaspers@users.noreply.github.com>
Date: Sun, 15 Mar 2026 17:50:08 +0200
Subject: [PATCH] feat(sequential-thinking): add tool annotations (#3534)

feat(sequential-thinking): add tool annotations

Adds MCP ToolAnnotations (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to the sequential-thinking tool, bringing it in line with the annotation pattern established by the filesystem server.

Fixes #3403
---
 src/sequentialthinking/index.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/sequentialthinking/index.ts b/src/sequentialthinking/index.ts
index 809086a9..a3c34cca 100644
--- a/src/sequentialthinking/index.ts
+++ b/src/sequentialthinking/index.ts
@@ -81,6 +81,12 @@ You should:
       branchId: z.string().optional().describe("Branch identifier"),
       needsMoreThoughts: z.boolean().optional().describe("If more thoughts are needed")
     },
+    annotations: {
+      readOnlyHint: true,
+      destructiveHint: false,
+      idempotentHint: true,
+      openWorldHint: false,
+    },
     outputSchema: {
       thoughtNumber: z.number(),
       totalThoughts: z.number(),