diff --git a/codex-rs/core/src/agent/control.rs b/codex-rs/core/src/agent/control.rs
index 404f08b4b8..17423a910f 100644
--- a/codex-rs/core/src/agent/control.rs
+++ b/codex-rs/core/src/agent/control.rs
@@ -1203,13 +1203,6 @@ impl AgentControl {
         self.watchdogs.register(registration).await
     }
 
-    pub(crate) async fn unregister_watchdog(
-        &self,
-        target_thread_id: ThreadId,
-    ) -> Option<RemovedWatchdog> {
-        self.watchdogs.unregister(target_thread_id).await
-    }
-
     pub(crate) async fn unregister_watchdogs_for_owner(
         &self,
         owner_thread_id: ThreadId,
diff --git a/codex-rs/core/src/agent/role.rs b/codex-rs/core/src/agent/role.rs
index cde3e3c064..4a3ac5b7ff 100644
--- a/codex-rs/core/src/agent/role.rs
+++ b/codex-rs/core/src/agent/role.rs
@@ -7,7 +7,6 @@
 //! which role to use; the multi-agent tool handler owns that orchestration.
 
 use crate::config::AgentRoleConfig;
-use crate::config::AgentRoleSpawnMode;
 use crate::config::Config;
 use crate::config::ConfigOverrides;
 use crate::config::agent_roles::parse_agent_role_file_contents;
@@ -28,16 +27,6 @@ use toml::Value as TomlValue;
 pub const DEFAULT_ROLE_NAME: &str = "default";
 const AGENT_TYPE_UNAVAILABLE_ERROR: &str = "agent type is currently not available";
 
-pub(crate) fn default_spawn_mode_for_role(
-    config: &Config,
-    role_name: Option<&str>,
-) -> AgentRoleSpawnMode {
-    let role_name = role_name.unwrap_or(DEFAULT_ROLE_NAME);
-    resolve_role_config(config, role_name)
-        .and_then(|role| role.spawn_mode)
-        .unwrap_or_default()
-}
-
 pub(crate) fn watchdog_interval_for_role(config: &Config, role_name: Option<&str>) -> Option<i64> {
     let role_name = role_name.unwrap_or(DEFAULT_ROLE_NAME);
     resolve_role_config(config, role_name).and_then(|role| role.watchdog_interval_s)
diff --git a/codex-rs/core/src/codex.rs b/codex-rs/core/src/codex.rs
index 843d015b9d..79e4c7d267 100644
--- a/codex-rs/core/src/codex.rs
+++ b/codex-rs/core/src/codex.rs
@@ -2191,26 +2191,6 @@ impl Session {
         self.active_turn.lock().await.is_some()
     }
 
-    pub(crate) async fn parent_thread_id(&self) -> Option<ThreadId> {
-        let state = self.state.lock().await;
-        match &state.session_configuration.session_source {
-            SessionSource::SubAgent(SubAgentSource::ThreadSpawn {
-                parent_thread_id, ..
-            }) => Some(*parent_thread_id),
-            _ => None,
-        }
-    }
-
-    pub(crate) fn mark_turn_used_agent_send_input(&self) {
-        self.turn_used_agent_send_input
-            .store(true, Ordering::Release);
-    }
-
-    pub(crate) fn reset_turn_agent_send_input_flag(&self) {
-        self.turn_used_agent_send_input
-            .store(false, Ordering::Release);
-    }
-
     pub(crate) fn snapshot_agent_send_input_on_turn_complete(&self) {
         let used_agent_send_input = self
             .turn_used_agent_send_input
diff --git a/codex-rs/core/src/tasks/mod.rs b/codex-rs/core/src/tasks/mod.rs
index 42f7b77863..e558c8f9c1 100644
--- a/codex-rs/core/src/tasks/mod.rs
+++ b/codex-rs/core/src/tasks/mod.rs
@@ -30,7 +30,6 @@ use crate::hook_runtime::record_additional_contexts;
 use crate::hook_runtime::record_pending_input;
 use crate::models_manager::manager::ModelsManager;
 use crate::protocol::EventMsg;
-use crate::protocol::TokenUsage;
 use crate::protocol::TurnAbortReason;
 use crate::protocol::TurnAbortedEvent;
 use crate::protocol::TurnCompleteEvent;
@@ -417,20 +416,6 @@ impl Session {
         self.send_event(turn_context.as_ref(), event).await;
     }
 
-    async fn register_new_active_task(
-        &self,
-        task: RunningTask,
-        token_usage_at_turn_start: TokenUsage,
-    ) {
-        self.reset_turn_agent_send_input_flag();
-        let mut active = self.active_turn.lock().await;
-        let mut turn = ActiveTurn::default();
-        let mut turn_state = turn.turn_state.lock().await;
-        turn_state.token_usage_at_turn_start = token_usage_at_turn_start;
-        drop(turn_state);
-        turn.add_task(task);
-        *active = Some(turn);
-    }
     async fn take_active_turn(&self) -> Option<ActiveTurn> {
         let mut active = self.active_turn.lock().await;
         active.take()
diff --git a/codex-rs/core/src/tools/handlers/multi_agents.rs b/codex-rs/core/src/tools/handlers/multi_agents.rs
index 38affed9b3..54c3cdba58 100644
--- a/codex-rs/core/src/tools/handlers/multi_agents.rs
+++ b/codex-rs/core/src/tools/handlers/multi_agents.rs
@@ -43,21 +43,6 @@ pub(crate) fn parse_agent_id_target(target: &str) -> Result<ThreadId, FunctionCa
     })
 }
 
-pub(crate) fn parse_agent_id_targets(
-    targets: Vec<String>,
-) -> Result<Vec<ThreadId>, FunctionCallError> {
-    if targets.is_empty() {
-        return Err(FunctionCallError::RespondToModel(
-            "agent ids must be non-empty".to_string(),
-        ));
-    }
-
-    targets
-        .into_iter()
-        .map(|target| parse_agent_id_target(&target))
-        .collect()
-}
-
 pub(crate) use close_agent::Handler as CloseAgentHandler;
 pub(crate) use compact_parent_context::Handler as CompactParentContextHandler;
 pub(crate) use list_agents::Handler as ListAgentsHandler;
diff --git a/codex-rs/core/src/tools/handlers/multi_agents/compact_parent_context.rs b/codex-rs/core/src/tools/handlers/multi_agents/compact_parent_context.rs
index 8468023ad8..79a3020102 100644
--- a/codex-rs/core/src/tools/handlers/multi_agents/compact_parent_context.rs
+++ b/codex-rs/core/src/tools/handlers/multi_agents/compact_parent_context.rs
@@ -36,8 +36,10 @@ impl ToolHandler for Handler {
 
 #[derive(Debug, Deserialize)]
 struct CompactParentContextArgs {
-    reason: Option<String>,
-    evidence: Option<String>,
+    #[serde(rename = "reason")]
+    _reason: Option<String>,
+    #[serde(rename = "evidence")]
+    _evidence: Option<String>,
 }
 
 #[derive(Debug, Serialize)]
diff --git a/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs b/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs
index 5fe7cca0b0..14632b0165 100644
--- a/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs
+++ b/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs
@@ -283,7 +283,8 @@ impl ToolHandler for Handler {
 struct SpawnAgentArgs {
     message: Option<String>,
     items: Option<Vec<UserInput>>,
-    task_name: Option<String>,
+    #[serde(rename = "task_name")]
+    _task_name: Option<String>,
     agent_type: Option<String>,
     model: Option<String>,
     model_fallback_list: Option<Vec<SpawnAgentModelFallbackCandidate>>,
diff --git a/codex-rs/features/src/lib.rs b/codex-rs/features/src/lib.rs
index 7d7915e3ae..3e8336307d 100644
--- a/codex-rs/features/src/lib.rs
+++ b/codex-rs/features/src/lib.rs
@@ -985,7 +985,7 @@ mod inbox_feature_tests {
         let stage = spec.stage;
 
         assert!(matches!(stage, Stage::Experimental { .. }));
-        assert_eq!(stage.experimental_menu_name(), Some("Smart Approvals"));
+        assert_eq!(stage.experimental_menu_name(), Some("Guardian Approvals"));
         assert_eq!(
             stage.experimental_menu_description().map(str::to_owned),
             Some(