diff --git a/docs/protocol/v1/draft/schema.mdx b/docs/protocol/v1/draft/schema.mdx
index eb4d43dd..1656b0ac 100644
--- a/docs/protocol/v1/draft/schema.mdx
+++ b/docs/protocol/v1/draft/schema.mdx
@@ -4185,7 +4185,7 @@ See protocol docs: [Extensibility](https://agentclientprotocol.com/protocol/v1/d
 
 ## <span class="font-mono">EnumOption</span>
 
-A titled enum option with a const value and human-readable title.
+A titled enum option with a const value, human-readable title, and optional description.
 
 **Type:** Object
 
@@ -4194,6 +4194,9 @@ A titled enum option with a const value and human-readable title.
 <ResponseField name="const" type={"string"} required>
   The constant value for this option.
 </ResponseField>
+<ResponseField name="description" type={"string | null"}>
+  Optional description for this option value.
+</ResponseField>
 <ResponseField name="title" type={"string"} required>
   Human-readable title for this option.
 </ResponseField>
diff --git a/docs/protocol/v2/draft/schema.mdx b/docs/protocol/v2/draft/schema.mdx
index 3f2db2fd..79954ed2 100644
--- a/docs/protocol/v2/draft/schema.mdx
+++ b/docs/protocol/v2/draft/schema.mdx
@@ -3784,7 +3784,7 @@ See protocol docs: [Extensibility](https://agentclientprotocol.com/protocol/v2/d
 
 ## <span class="font-mono">EnumOption</span>
 
-A titled enum option with a const value and human-readable title.
+A titled enum option with a const value, human-readable title, and optional description.
 
 **Type:** Object
 
@@ -3793,6 +3793,9 @@ A titled enum option with a const value and human-readable title.
 <ResponseField name="const" type={"string"} required>
   The constant value for this option.
 </ResponseField>
+<ResponseField name="description" type={"string | null"}>
+  Optional description for this option value.
+</ResponseField>
 <ResponseField name="title" type={"string"} required>
   Human-readable title for this option.
 </ResponseField>
diff --git a/docs/rfds/elicitation.mdx b/docs/rfds/elicitation.mdx
index ab69c108..72f3d692 100644
--- a/docs/rfds/elicitation.mdx
+++ b/docs/rfds/elicitation.mdx
@@ -99,12 +99,18 @@ Agents send elicitation requests when they need information from the user. This
         "oneOf": [
           {
             "const": "conservative",
-            "title": "Conservative - Minimal changes"
+            "title": "Conservative - Minimal changes",
+            "description": "Make minimal changes and avoid broad cleanup."
+          },
+          {
+            "const": "balanced",
+            "title": "Balanced (Recommended)",
+            "description": "Fix the issue and clean nearby code when it lowers risk."
           },
-          { "const": "balanced", "title": "Balanced (Recommended)" },
           {
             "const": "aggressive",
-            "title": "Aggressive - Maximum optimization"
+            "title": "Aggressive - Maximum optimization",
+            "description": "Refactor more broadly to optimize the affected area."
           }
         ],
         "default": "balanced"
@@ -269,9 +275,21 @@ Single-select enum (with titles):
   "title": "Color Selection",
   "description": "Choose your favorite color",
   "oneOf": [
-    { "const": "#FF0000", "title": "Red" },
-    { "const": "#00FF00", "title": "Green" },
-    { "const": "#0000FF", "title": "Blue" }
+    {
+      "const": "#FF0000",
+      "title": "Red",
+      "description": "High emphasis and warning-oriented."
+    },
+    {
+      "const": "#00FF00",
+      "title": "Green",
+      "description": "Positive status and success-oriented."
+    },
+    {
+      "const": "#0000FF",
+      "title": "Blue",
+      "description": "Neutral and informational."
+    }
   ],
   "default": "#FF0000"
 }
@@ -305,9 +323,21 @@ Multi-select enum (with titles):
   "maxItems": 2,
   "items": {
     "anyOf": [
-      { "const": "#FF0000", "title": "Red" },
-      { "const": "#00FF00", "title": "Green" },
-      { "const": "#0000FF", "title": "Blue" }
+      {
+        "const": "#FF0000",
+        "title": "Red",
+        "description": "High emphasis and warning-oriented."
+      },
+      {
+        "const": "#00FF00",
+        "title": "Green",
+        "description": "Positive status and success-oriented."
+      },
+      {
+        "const": "#0000FF",
+        "title": "Blue",
+        "description": "Neutral and informational."
+      }
     ]
   },
   "default": ["#FF0000", "#00FF00"]
@@ -368,9 +398,21 @@ The agent sends an `elicitation/create` request when it needs information from t
           "type": "string",
           "title": "Refactoring Strategy",
           "oneOf": [
-            { "const": "conservative", "title": "Conservative" },
-            { "const": "balanced", "title": "Balanced (Recommended)" },
-            { "const": "aggressive", "title": "Aggressive" }
+            {
+              "const": "conservative",
+              "title": "Conservative",
+              "description": "Make minimal changes and avoid broad cleanup."
+            },
+            {
+              "const": "balanced",
+              "title": "Balanced (Recommended)",
+              "description": "Fix the issue and clean nearby code when it lowers risk."
+            },
+            {
+              "const": "aggressive",
+              "title": "Aggressive",
+              "description": "Refactor more broadly to optimize the affected area."
+            }
           ],
           "default": "balanced"
         }
diff --git a/schema/v1/schema.unstable.json b/schema/v1/schema.unstable.json
index 8a748875..710b9d58 100644
--- a/schema/v1/schema.unstable.json
+++ b/schema/v1/schema.unstable.json
@@ -1509,7 +1509,7 @@
       ]
     },
     "EnumOption": {
-      "description": "A titled enum option with a const value and human-readable title.",
+      "description": "A titled enum option with a const value, human-readable title, and optional description.",
       "type": "object",
       "properties": {
         "const": {
@@ -1519,6 +1519,10 @@
         "title": {
           "description": "Human-readable title for this option.",
           "type": "string"
+        },
+        "description": {
+          "description": "Optional description for this option value.",
+          "type": ["string", "null"]
         }
       },
       "required": ["const", "title"]
diff --git a/schema/v2/schema.unstable.json b/schema/v2/schema.unstable.json
index a153590b..551a1f56 100644
--- a/schema/v2/schema.unstable.json
+++ b/schema/v2/schema.unstable.json
@@ -1694,7 +1694,7 @@
       ]
     },
     "EnumOption": {
-      "description": "A titled enum option with a const value and human-readable title.",
+      "description": "A titled enum option with a const value, human-readable title, and optional description.",
       "type": "object",
       "properties": {
         "const": {
@@ -1704,6 +1704,10 @@
         "title": {
           "description": "Human-readable title for this option.",
           "type": "string"
+        },
+        "description": {
+          "description": "Optional description for this option value.",
+          "type": ["string", "null"]
         }
       },
       "required": ["const", "title"]
diff --git a/src/v1/elicitation.rs b/src/v1/elicitation.rs
index 6ba41946..9975dea5 100644
--- a/src/v1/elicitation.rs
+++ b/src/v1/elicitation.rs
@@ -60,7 +60,8 @@ pub enum ElicitationSchemaType {
     Object,
 }
 
-/// A titled enum option with a const value and human-readable title.
+/// A titled enum option with a const value, human-readable title, and optional description.
+#[skip_serializing_none]
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
 #[non_exhaustive]
 pub struct EnumOption {
@@ -69,6 +70,8 @@ pub struct EnumOption {
     pub value: String,
     /// Human-readable title for this option.
     pub title: String,
+    /// Optional description for this option value.
+    pub description: Option<String>,
 }
 
 impl EnumOption {
@@ -78,8 +81,16 @@ impl EnumOption {
         Self {
             value: value.into(),
             title: title.into(),
+            description: None,
         }
     }
+
+    /// Optional description for this option value.
+    #[must_use]
+    pub fn description(mut self, description: impl IntoOption<String>) -> Self {
+        self.description = description.into_option();
+        self
+    }
 }
 
 /// Schema for string properties in an elicitation form.
@@ -1763,7 +1774,7 @@ mod tests {
         let schema = ElicitationSchema::new().property(
             "country",
             StringPropertySchema::new().one_of(vec![
-                EnumOption::new("us", "United States"),
+                EnumOption::new("us", "United States").description("Use US English spelling."),
                 EnumOption::new("uk", "United Kingdom"),
             ]),
             true,
@@ -1775,12 +1786,20 @@ mod tests {
         assert_eq!(one_of.len(), 2);
         assert_eq!(one_of[0]["const"], "us");
         assert_eq!(one_of[0]["title"], "United States");
+        assert_eq!(one_of[0]["description"], "Use US English spelling.");
+        assert!(one_of[1].get("description").is_none());
 
         let roundtripped: ElicitationSchema = serde_json::from_value(json).unwrap();
         if let ElicitationPropertySchema::String(s) =
             roundtripped.properties.get("country").unwrap()
         {
-            assert_eq!(s.one_of.as_ref().unwrap().len(), 2);
+            let one_of = s.one_of.as_ref().unwrap();
+            assert_eq!(one_of.len(), 2);
+            assert_eq!(
+                one_of[0].description.as_deref(),
+                Some("Use US English spelling.")
+            );
+            assert!(one_of[1].description.is_none());
         } else {
             panic!("expected String variant");
         }
diff --git a/src/v2/conversion.rs b/src/v2/conversion.rs
index f72a8792..3417269e 100644
--- a/src/v2/conversion.rs
+++ b/src/v2/conversion.rs
@@ -7347,10 +7347,15 @@ impl IntoV1 for super::EnumOption {
     type Output = crate::v1::EnumOption;
 
     fn into_v1(self) -> Result<Self::Output> {
-        let Self { value, title } = self;
+        let Self {
+            value,
+            title,
+            description,
+        } = self;
         Ok(crate::v1::EnumOption {
             value: value.into_v1()?,
             title: title.into_v1()?,
+            description: description.into_v1()?,
         })
     }
 }
@@ -7360,10 +7365,15 @@ impl IntoV2 for crate::v1::EnumOption {
     type Output = super::EnumOption;
 
     fn into_v2(self) -> Result<Self::Output> {
-        let Self { value, title } = self;
+        let Self {
+            value,
+            title,
+            description,
+        } = self;
         Ok(super::EnumOption {
             value: value.into_v2()?,
             title: title.into_v2()?,
+            description: description.into_v2()?,
         })
     }
 }
diff --git a/src/v2/elicitation.rs b/src/v2/elicitation.rs
index 69f5cd5d..0051c134 100644
--- a/src/v2/elicitation.rs
+++ b/src/v2/elicitation.rs
@@ -67,7 +67,8 @@ pub enum ElicitationSchemaType {
     Object,
 }
 
-/// A titled enum option with a const value and human-readable title.
+/// A titled enum option with a const value, human-readable title, and optional description.
+#[skip_serializing_none]
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
 #[non_exhaustive]
 pub struct EnumOption {
@@ -76,6 +77,8 @@ pub struct EnumOption {
     pub value: String,
     /// Human-readable title for this option.
     pub title: String,
+    /// Optional description for this option value.
+    pub description: Option<String>,
 }
 
 impl EnumOption {
@@ -85,8 +88,16 @@ impl EnumOption {
         Self {
             value: value.into(),
             title: title.into(),
+            description: None,
         }
     }
+
+    /// Optional description for this option value.
+    #[must_use]
+    pub fn description(mut self, description: impl IntoOption<String>) -> Self {
+        self.description = description.into_option();
+        self
+    }
 }
 
 /// Schema for string properties in an elicitation form.
@@ -1767,7 +1778,7 @@ mod tests {
         let schema = ElicitationSchema::new().property(
             "country",
             StringPropertySchema::new().one_of(vec![
-                EnumOption::new("us", "United States"),
+                EnumOption::new("us", "United States").description("Use US English spelling."),
                 EnumOption::new("uk", "United Kingdom"),
             ]),
             true,
@@ -1779,12 +1790,20 @@ mod tests {
         assert_eq!(one_of.len(), 2);
         assert_eq!(one_of[0]["const"], "us");
         assert_eq!(one_of[0]["title"], "United States");
+        assert_eq!(one_of[0]["description"], "Use US English spelling.");
+        assert!(one_of[1].get("description").is_none());
 
         let roundtripped: ElicitationSchema = serde_json::from_value(json).unwrap();
         if let ElicitationPropertySchema::String(s) =
             roundtripped.properties.get("country").unwrap()
         {
-            assert_eq!(s.one_of.as_ref().unwrap().len(), 2);
+            let one_of = s.one_of.as_ref().unwrap();
+            assert_eq!(one_of.len(), 2);
+            assert_eq!(
+                one_of[0].description.as_deref(),
+                Some("Use US English spelling.")
+            );
+            assert!(one_of[1].description.is_none());
         } else {
             panic!("expected String variant");
         }