feat: add feature to monitor background agents (#125)

Also includes a fix to persist configuration across reconnects.

Reviewed-on: #125
Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-committed-by: Naomi Carrigan <commits@nhcarrigan.com>

src-tauri/src/types.rs

@@ -197,6 +197,8 @@ pub struct OutputEvent {
     pub conversation_id: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     pub cost: Option<MessageCost>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub parent_tool_use_id: Option<String>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -248,6 +250,33 @@ pub struct UserQuestionEvent {
     pub conversation_id: Option<String>,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AgentStartEvent {
+    pub tool_use_id: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub agent_id: Option<String>,
+    pub description: String,
+    pub subagent_type: String,
+    pub started_at: u64,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub parent_tool_use_id: Option<String>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AgentEndEvent {
+    pub tool_use_id: String,
+    pub ended_at: u64,
+    pub is_error: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub conversation_id: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub duration_ms: Option<u64>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub num_turns: Option<u32>,
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -369,6 +398,7 @@ mod tests {
             tool_name: None,
             conversation_id: None,
             cost: None,
+            parent_tool_use_id: None,
         };
 
         let serialized = serde_json::to_string(&event).unwrap();
@@ -388,6 +418,7 @@ mod tests {
                 output_tokens: 50,
                 cost_usd: 0.005,
             }),
+            parent_tool_use_id: None,
         };
 
         let serialized = serde_json::to_string(&event).unwrap();