diff --git a/codex-rs/core/src/session/mod.rs b/codex-rs/core/src/session/mod.rs
index 89c12aaf81..4e1dc43793 100644
--- a/codex-rs/core/src/session/mod.rs
+++ b/codex-rs/core/src/session/mod.rs
@@ -353,7 +353,6 @@ use codex_protocol::protocol::TokenUsage;
 use codex_protocol::protocol::TokenUsageInfo;
 use codex_protocol::protocol::WarningEvent;
 use codex_protocol::user_input::UserInput;
-use codex_tools::ToolEnvironmentMode;
 use codex_tools::ToolsConfig;
 use codex_tools::ToolsConfigParams;
 use codex_utils_absolute_path::AbsolutePathBuf;