diff --git a/src/everything/tools/echo.ts b/src/everything/tools/echo.ts
index 204a2fb49b..2526e7cb7d 100644
--- a/src/everything/tools/echo.ts
+++ b/src/everything/tools/echo.ts
@@ -13,6 +13,11 @@ const config = {
   title: "Echo Tool",
   description: "Echoes back the input string",
   inputSchema: EchoSchema,
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
 };
 
 /**
diff --git a/src/everything/tools/get-annotated-message.ts b/src/everything/tools/get-annotated-message.ts
index ead0660e8f..a37ecde214 100644
--- a/src/everything/tools/get-annotated-message.ts
+++ b/src/everything/tools/get-annotated-message.ts
@@ -21,6 +21,11 @@ const config = {
   description:
     "Demonstrates how annotations can be used to provide metadata about content.",
   inputSchema: GetAnnotatedMessageSchema,
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
 };
 
 /**
diff --git a/src/everything/tools/get-env.ts b/src/everything/tools/get-env.ts
index 0adbf5a14d..bbe2f95533 100644
--- a/src/everything/tools/get-env.ts
+++ b/src/everything/tools/get-env.ts
@@ -8,6 +8,11 @@ const config = {
   description:
     "Returns all environment variables, helpful for debugging MCP server configuration",
   inputSchema: {},
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
 };
 
 /**
diff --git a/src/everything/tools/get-structured-content.ts b/src/everything/tools/get-structured-content.ts
index 83c98c0ab6..6f42863187 100644
--- a/src/everything/tools/get-structured-content.ts
+++ b/src/everything/tools/get-structured-content.ts
@@ -26,6 +26,11 @@ const config = {
   description:
     "Returns structured content along with an output schema for client data validation",
   inputSchema: GetStructuredContentInputSchema,
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
   outputSchema: GetStructuredContentOutputSchema,
 };
 
diff --git a/src/everything/tools/get-sum.ts b/src/everything/tools/get-sum.ts
index 522043c88f..e5213a5ad9 100644
--- a/src/everything/tools/get-sum.ts
+++ b/src/everything/tools/get-sum.ts
@@ -14,6 +14,11 @@ const config = {
   title: "Get Sum Tool",
   description: "Returns the sum of two numbers",
   inputSchema: GetSumSchema,
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
 };
 
 /**
diff --git a/src/everything/tools/get-tiny-image.ts b/src/everything/tools/get-tiny-image.ts
index 720707d0ce..59881b51c5 100644
--- a/src/everything/tools/get-tiny-image.ts
+++ b/src/everything/tools/get-tiny-image.ts
@@ -11,6 +11,11 @@ const config = {
   title: "Get Tiny Image Tool",
   description: "Returns a tiny MCP logo image.",
   inputSchema: {},
+  annotations: {
+    readOnlyHint: true,
+    destructiveHint: false,
+    idempotentHint: true,
+  },
 };
 
 /**
diff --git a/src/everything/tools/toggle-simulated-logging.ts b/src/everything/tools/toggle-simulated-logging.ts
index 4941ed77d0..126c9263d7 100644
--- a/src/everything/tools/toggle-simulated-logging.ts
+++ b/src/everything/tools/toggle-simulated-logging.ts
@@ -11,6 +11,11 @@ const config = {
   title: "Toggle Simulated Logging",
   description: "Toggles simulated, random-leveled logging on or off.",
   inputSchema: {},
+  annotations: {
+    readOnlyHint: false,
+    destructiveHint: false,
+    idempotentHint: false,
+  },
 };
 
 // Track enabled clients by session id