Omit unavailable task messages from list_agents

codex-rs/core/src/agent/control.rs

@@ -78,7 +78,6 @@ pub(crate) struct LiveAgent {
 pub(crate) struct ListedAgent {
     pub(crate) agent_name: String,
     pub(crate) agent_status: AgentStatus,
-    pub(crate) last_task_message: Option<String>,
 }
 
 /// Control-plane handle for multi-agent operations.
@@ -345,7 +344,6 @@ impl AgentControl {
             agents.push(ListedAgent {
                 agent_name: root_path.to_string(),
                 agent_status: root_thread.agent_status().await,
-                last_task_message: None,
             });
         }
 
@@ -371,7 +369,6 @@ impl AgentControl {
             agents.push(ListedAgent {
                 agent_name,
                 agent_status: thread.agent_status().await,
-                last_task_message: None,
             });
         }
 

codex-rs/core/src/tools/handlers/multi_agents_spec.rs

@@ -435,13 +435,9 @@ fn list_agents_output_schema() -> Value {
                         "agent_status": {
                             "description": "Last known status of the agent.",
                             "allOf": [agent_status_output_schema()]
-                        },
-                        "last_task_message": {
-                            "type": ["string", "null"],
-                            "description": "Most recent user or inter-agent instruction received by the agent, when available."
                         }
                     },
-                    "required": ["agent_name", "agent_status", "last_task_message"],
+                    "required": ["agent_name", "agent_status"],
                     "additionalProperties": false
                 },
                 "description": "Live agents visible in the current root thread tree."

codex-rs/core/src/tools/handlers/multi_agents_spec_tests.rs

@@ -393,7 +393,7 @@ fn list_agents_tool_includes_path_prefix_and_agent_fields() {
     );
     assert_eq!(
         output_schema.expect("list_agents output schema")["properties"]["agents"]["items"]["required"],
-        json!(["agent_name", "agent_status", "last_task_message"])
+        json!(["agent_name", "agent_status"])
     );
 }
 

codex-rs/core/src/tools/handlers/multi_agents_tests.rs

@@ -179,7 +179,6 @@ struct ListAgentsResult {
 struct ListedAgentResult {
     agent_name: String,
     agent_status: serde_json::Value,
-    last_task_message: serde_json::Value,
 }
 
 #[derive(Debug, Deserialize)]
@@ -1592,7 +1591,6 @@ async fn multi_agent_v2_list_agents_returns_completed_status() {
         .find(|agent| agent.agent_name == "/root/worker")
         .expect("worker agent should be listed");
     assert_eq!(worker.agent_status, json!({"completed": "done"}));
-    assert_eq!(worker.last_task_message, serde_json::Value::Null);
     assert_eq!(success, Some(true));
 }