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 a50d17f34..3f6c97fcb 100644
--- a/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs
+++ b/codex-rs/core/src/tools/handlers/multi_agents/spawn.rs
@@ -204,7 +204,7 @@ async fn handle_spawn_agent(
     turn.session_telemetry.counter(
         "codex.multi_agent.spawn",
         /*inc*/ 1,
-        &[("role", role_tag)],
+        &[("role", role_tag), ("version", "v1")],
     );
 
     Ok(SpawnAgentResult {
diff --git a/codex-rs/core/src/tools/handlers/multi_agents_v2/spawn.rs b/codex-rs/core/src/tools/handlers/multi_agents_v2/spawn.rs
index fc97df05d..34fddc60b 100644
--- a/codex-rs/core/src/tools/handlers/multi_agents_v2/spawn.rs
+++ b/codex-rs/core/src/tools/handlers/multi_agents_v2/spawn.rs
@@ -165,7 +165,7 @@ async fn handle_spawn_agent(
     turn.session_telemetry.counter(
         "codex.multi_agent.spawn",
         /*inc*/ 1,
-        &[("role", role_tag)],
+        &[("role", role_tag), ("version", "v2")],
     );
     let task_name = String::from(new_agent_path);