feat(mcp): elicitation support (#5965)

crates/goose/src/conversation/message.rs

@@ -111,6 +111,15 @@ pub enum ActionRequiredData {
         arguments: JsonObject,
         prompt: Option<String>,
     },
+    Elicitation {
+        id: String,
+        message: String,
+        requested_schema: serde_json::Value,
+    },
+    ElicitationResponse {
+        id: String,
+        user_data: serde_json::Value,
+    },
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, ToSchema)]
@@ -192,6 +201,12 @@ impl fmt::Display for MessageContent {
                 ActionRequiredData::ToolConfirmation { tool_name, .. } => {
                     write!(f, "[ActionRequired: ToolConfirmation for {}]", tool_name)
                 }
+                ActionRequiredData::Elicitation { message, .. } => {
+                    write!(f, "[ActionRequired: Elicitation - {}]", message)
+                }
+                ActionRequiredData::ElicitationResponse { id, .. } => {
+                    write!(f, "[ActionRequired: ElicitationResponse for {}]", id)
+                }
             },
             MessageContent::FrontendToolRequest(r) => match &r.tool_call {
                 Ok(tool_call) => write!(f, "[FrontendToolRequest: {}]", tool_call.name),
@@ -274,6 +289,32 @@ impl MessageContent {
         })
     }
 
+    pub fn action_required_elicitation<S: Into<String>>(
+        id: S,
+        message: String,
+        requested_schema: serde_json::Value,
+    ) -> Self {
+        MessageContent::ActionRequired(ActionRequired {
+            data: ActionRequiredData::Elicitation {
+                id: id.into(),
+                message,
+                requested_schema,
+            },
+        })
+    }
+
+    pub fn action_required_elicitation_response<S: Into<String>>(
+        id: S,
+        user_data: serde_json::Value,
+    ) -> Self {
+        MessageContent::ActionRequired(ActionRequired {
+            data: ActionRequiredData::ElicitationResponse {
+                id: id.into(),
+                user_data,
+            },
+        })
+    }
+
     pub fn thinking<S1: Into<String>, S2: Into<String>>(thinking: S1, signature: S2) -> Self {
         MessageContent::Thinking(ThinkingContent {
             thinking: thinking.into(),