Show spawned agent model and effort in TUI

codex-rs/app-server-protocol/schema/json/EventMsg.json

@@ -3015,10 +3015,16 @@
               "description": "Identifier for the collab tool call.",
               "type": "string"
             },
+            "model": {
+              "type": "string"
+            },
             "prompt": {
               "description": "Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the beginning.",
               "type": "string"
             },
+            "reasoning_effort": {
+              "$ref": "#/definitions/ReasoningEffort"
+            },
             "sender_thread_id": {
               "allOf": [
                 {
@@ -3037,7 +3043,9 @@
           },
           "required": [
             "call_id",
+            "model",
             "prompt",
+            "reasoning_effort",
             "sender_thread_id",
             "type"
           ],
@@ -9115,10 +9123,16 @@
           "description": "Identifier for the collab tool call.",
           "type": "string"
         },
+        "model": {
+          "type": "string"
+        },
         "prompt": {
           "description": "Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the beginning.",
           "type": "string"
         },
+        "reasoning_effort": {
+          "$ref": "#/definitions/ReasoningEffort"
+        },
         "sender_thread_id": {
           "allOf": [
             {
@@ -9137,7 +9151,9 @@
       },
       "required": [
         "call_id",
+        "model",
         "prompt",
+        "reasoning_effort",
         "sender_thread_id",
         "type"
       ],

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -4366,10 +4366,16 @@
               "description": "Identifier for the collab tool call.",
               "type": "string"
             },
+            "model": {
+              "type": "string"
+            },
             "prompt": {
               "description": "Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the beginning.",
               "type": "string"
             },
+            "reasoning_effort": {
+              "$ref": "#/definitions/v2/ReasoningEffort"
+            },
             "sender_thread_id": {
               "allOf": [
                 {
@@ -4388,7 +4394,9 @@
           },
           "required": [
             "call_id",
+            "model",
             "prompt",
+            "reasoning_effort",
             "sender_thread_id",
             "type"
           ],

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.v2.schemas.json

@@ -6176,10 +6176,16 @@
               "description": "Identifier for the collab tool call.",
               "type": "string"
             },
+            "model": {
+              "type": "string"
+            },
             "prompt": {
               "description": "Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the beginning.",
               "type": "string"
             },
+            "reasoning_effort": {
+              "$ref": "#/definitions/ReasoningEffort"
+            },
             "sender_thread_id": {
               "allOf": [
                 {
@@ -6198,7 +6204,9 @@
           },
           "required": [
             "call_id",
+            "model",
             "prompt",
+            "reasoning_effort",
             "sender_thread_id",
             "type"
           ],

codex-rs/app-server-protocol/schema/typescript/CollabAgentSpawnBeginEvent.ts

@@ -1,6 +1,7 @@
 // GENERATED CODE! DO NOT MODIFY BY HAND!
 
 // This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { ReasoningEffort } from "./ReasoningEffort";
 import type { ThreadId } from "./ThreadId";
 
 export type CollabAgentSpawnBeginEvent = { 
@@ -16,4 +17,4 @@ sender_thread_id: ThreadId,
  * Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the
  * beginning.
  */
-prompt: string, };
+prompt: string, model: string, reasoning_effort: ReasoningEffort, };

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

@@ -157,6 +157,8 @@ mod spawn {
                     call_id: call_id.clone(),
                     sender_thread_id: session.conversation_id,
                     prompt: prompt.clone(),
+                    model: args.model.clone().unwrap_or_default(),
+                    reasoning_effort: args.reasoning_effort.unwrap_or_default(),
                 }
                 .into(),
             )

codex-rs/core/src/tools/spec.rs

@@ -1205,8 +1205,7 @@ fn create_close_agent_tool() -> ToolSpec {
 
     ToolSpec::Function(ResponsesApiTool {
         name: "close_agent".to_string(),
-        description: "Close an agent when it is no longer needed and return its last known status."
-            .to_string(),
+        description: "Close an agent when it is no longer needed and return its last known status. Don't keep agents open for too long if they are not needed anymore.".to_string(),
         strict: false,
         parameters: JsonSchema::Object {
             properties,

codex-rs/exec/src/event_processor_with_human_output.rs

@@ -698,6 +698,7 @@ impl EventProcessor for EventProcessorWithHumanOutput {
                 call_id,
                 sender_thread_id: _,
                 prompt,
+                ..
             }) => {
                 ts_msg!(
                     self,

codex-rs/exec/tests/event_processor_with_json_output.rs

@@ -34,6 +34,7 @@ use codex_protocol::ThreadId;
 use codex_protocol::config_types::ModeKind;
 use codex_protocol::mcp::CallToolResult;
 use codex_protocol::models::WebSearchAction;
+use codex_protocol::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use codex_protocol::plan_tool::PlanItemArg;
 use codex_protocol::plan_tool::StepStatus;
 use codex_protocol::plan_tool::UpdatePlanArgs;
@@ -547,6 +548,8 @@ fn collab_spawn_begin_and_end_emit_item_events() {
             call_id: "call-10".to_string(),
             sender_thread_id,
             prompt: prompt.clone(),
+            model: "gpt-5".to_string(),
+            reasoning_effort: ReasoningEffortConfig::default(),
         }),
     );
     let begin_events = ep.collect_thread_events(&begin);

codex-rs/protocol/src/protocol.rs

@@ -3125,6 +3125,8 @@ pub struct CollabAgentSpawnBeginEvent {
     /// Initial prompt sent to the agent. Can be empty to prevent CoT leaking at the
     /// beginning.
     pub prompt: String,
+    pub model: String,
+    pub reasoning_effort: ReasoningEffortConfig,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq, JsonSchema, TS)]

codex-rs/tui/src/chatwidget.rs

@@ -101,6 +101,7 @@ use codex_protocol::protocol::AgentReasoningRawContentEvent;
 use codex_protocol::protocol::ApplyPatchApprovalRequestEvent;
 use codex_protocol::protocol::BackgroundEventEvent;
 use codex_protocol::protocol::CodexErrorInfo;
+use codex_protocol::protocol::CollabAgentSpawnBeginEvent;
 use codex_protocol::protocol::CreditsSnapshot;
 use codex_protocol::protocol::DeprecationNoticeEvent;
 use codex_protocol::protocol::ErrorEvent;
@@ -579,6 +580,7 @@ pub(crate) struct ChatWidget {
     // Latest completed user-visible Codex output that `/copy` should place on the clipboard.
     last_copyable_output: Option<String>,
     running_commands: HashMap<String, RunningCommand>,
+    pending_collab_spawn_requests: HashMap<String, multi_agents::SpawnRequestSummary>,
     suppressed_exec_calls: HashSet<String>,
     skills_all: Vec<ProtocolSkillMetadata>,
     skills_initial_state: Option<HashMap<PathBuf, bool>>,
@@ -3243,6 +3245,7 @@ impl ChatWidget {
             plan_stream_controller: None,
             last_copyable_output: None,
             running_commands: HashMap::new(),
+            pending_collab_spawn_requests: HashMap::new(),
             suppressed_exec_calls: HashSet::new(),
             last_unified_wait: None,
             unified_exec_wait_streak: None,
@@ -3427,6 +3430,7 @@ impl ChatWidget {
             plan_stream_controller: None,
             last_copyable_output: None,
             running_commands: HashMap::new(),
+            pending_collab_spawn_requests: HashMap::new(),
             suppressed_exec_calls: HashSet::new(),
             last_unified_wait: None,
             unified_exec_wait_streak: None,
@@ -3603,6 +3607,7 @@ impl ChatWidget {
             plan_stream_controller: None,
             last_copyable_output: None,
             running_commands: HashMap::new(),
+            pending_collab_spawn_requests: HashMap::new(),
             suppressed_exec_calls: HashSet::new(),
             last_unified_wait: None,
             unified_exec_wait_streak: None,
@@ -4999,8 +5004,24 @@ impl ChatWidget {
             }
             EventMsg::ExitedReviewMode(review) => self.on_exited_review_mode(review),
             EventMsg::ContextCompacted(_) => self.on_agent_message("Context compacted".to_owned()),
-            EventMsg::CollabAgentSpawnBegin(_) => {}
-            EventMsg::CollabAgentSpawnEnd(ev) => self.on_collab_event(multi_agents::spawn_end(ev)),
+            EventMsg::CollabAgentSpawnBegin(CollabAgentSpawnBeginEvent {
+                call_id,
+                model,
+                reasoning_effort,
+                ..
+            }) => {
+                self.pending_collab_spawn_requests.insert(
+                    call_id,
+                    multi_agents::SpawnRequestSummary {
+                        model,
+                        reasoning_effort,
+                    },
+                );
+            }
+            EventMsg::CollabAgentSpawnEnd(ev) => {
+                let spawn_request = self.pending_collab_spawn_requests.remove(&ev.call_id);
+                self.on_collab_event(multi_agents::spawn_end(ev, spawn_request.as_ref()));
+            }
             EventMsg::CollabAgentInteractionBegin(_) => {}
             EventMsg::CollabAgentInteractionEnd(ev) => {
                 self.on_collab_event(multi_agents::interaction_end(ev))

codex-rs/tui/src/chatwidget/tests.rs

@@ -58,9 +58,12 @@ use codex_protocol::protocol::AgentMessageDeltaEvent;
 use codex_protocol::protocol::AgentMessageEvent;
 use codex_protocol::protocol::AgentReasoningDeltaEvent;
 use codex_protocol::protocol::AgentReasoningEvent;
+use codex_protocol::protocol::AgentStatus;
 use codex_protocol::protocol::ApplyPatchApprovalRequestEvent;
 use codex_protocol::protocol::BackgroundEventEvent;
 use codex_protocol::protocol::CodexErrorInfo;
+use codex_protocol::protocol::CollabAgentSpawnBeginEvent;
+use codex_protocol::protocol::CollabAgentSpawnEndEvent;
 use codex_protocol::protocol::CreditsSnapshot;
 use codex_protocol::protocol::Event;
 use codex_protocol::protocol::EventMsg;
@@ -1838,6 +1841,7 @@ async fn make_chatwidget_manual(
         plan_stream_controller: None,
         last_copyable_output: None,
         running_commands: HashMap::new(),
+        pending_collab_spawn_requests: HashMap::new(),
         suppressed_exec_calls: HashSet::new(),
         skills_all: Vec::new(),
         skills_initial_state: None,
@@ -2011,6 +2015,48 @@ fn lines_to_single_string(lines: &[ratatui::text::Line<'static>]) -> String {
     s
 }
 
+#[tokio::test]
+async fn collab_spawn_end_shows_requested_model_and_effort() {
+    let (mut chat, mut rx, _ops) = make_chatwidget_manual(None).await;
+    let sender_thread_id = ThreadId::new();
+    let spawned_thread_id = ThreadId::new();
+
+    chat.handle_codex_event(Event {
+        id: "spawn-begin".into(),
+        msg: EventMsg::CollabAgentSpawnBegin(CollabAgentSpawnBeginEvent {
+            call_id: "call-spawn".to_string(),
+            sender_thread_id,
+            prompt: "Explore the repo".to_string(),
+            model: "gpt-5".to_string(),
+            reasoning_effort: ReasoningEffortConfig::High,
+        }),
+    });
+    chat.handle_codex_event(Event {
+        id: "spawn-end".into(),
+        msg: EventMsg::CollabAgentSpawnEnd(CollabAgentSpawnEndEvent {
+            call_id: "call-spawn".to_string(),
+            sender_thread_id,
+            new_thread_id: Some(spawned_thread_id),
+            new_agent_nickname: Some("Robie".to_string()),
+            new_agent_role: Some("explorer".to_string()),
+            prompt: "Explore the repo".to_string(),
+            status: AgentStatus::PendingInit,
+        }),
+    });
+
+    let cells = drain_insert_history(&mut rx);
+    let rendered = cells
+        .iter()
+        .map(|lines| lines_to_single_string(lines))
+        .collect::<Vec<_>>()
+        .join("\n");
+
+    assert!(
+        rendered.contains("Spawned Robie [explorer] (gpt-5 high)"),
+        "expected spawn line to include agent metadata and requested model, got {rendered:?}"
+    );
+}
+
 fn status_line_text(chat: &ChatWidget) -> Option<String> {
     chat.status_line_text()
 }