diff --git a/codex-rs/features/src/feature_configs.rs b/codex-rs/features/src/feature_configs.rs
index b7992fefd4..7665a4ca8b 100644
--- a/codex-rs/features/src/feature_configs.rs
+++ b/codex-rs/features/src/feature_configs.rs
@@ -89,6 +89,10 @@ impl FeatureConfig for NetworkProxyConfigToml {
     fn enabled(&self) -> Option<bool> {
         self.enabled
     }
+
+    fn set_enabled(&mut self, enabled: bool) {
+        self.enabled = Some(enabled);
+    }
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema)]
diff --git a/codex-rs/features/src/lib.rs b/codex-rs/features/src/lib.rs
index 95bc297f1f..522ba2f156 100644
--- a/codex-rs/features/src/lib.rs
+++ b/codex-rs/features/src/lib.rs
@@ -632,6 +632,7 @@ impl FeaturesToml {
         let Self {
             multi_agent_v2,
             apps_mcp_path_override,
+            network_proxy,
             entries,
         } = self;
         for key in legacy::legacy_feature_keys() {
@@ -643,6 +644,8 @@ impl FeaturesToml {
                 materialize_resolved_feature_enabled(multi_agent_v2, enabled);
             } else if spec.id == Feature::AppsMcpPathOverride {
                 materialize_resolved_feature_enabled(apps_mcp_path_override, enabled);
+            } else if spec.id == Feature::NetworkProxy {
+                materialize_resolved_feature_enabled(network_proxy, enabled);
             } else {
                 entries.insert(spec.key.to_string(), enabled);
             }
diff --git a/codex-rs/features/src/tests.rs b/codex-rs/features/src/tests.rs
index d1d7d3cae9..5cc453b559 100644
--- a/codex-rs/features/src/tests.rs
+++ b/codex-rs/features/src/tests.rs
@@ -551,6 +551,7 @@ fn materialize_resolved_enabled_writes_all_features_and_preserves_custom_config(
     let mut features = Features::with_defaults();
     features.enable(Feature::CodeMode);
     features.enable(Feature::MultiAgentV2);
+    features.enable(Feature::NetworkProxy);
     features.disable(Feature::ToolSearch);
 
     let mut features_toml = FeaturesToml {
@@ -559,6 +560,11 @@ fn materialize_resolved_enabled_writes_all_features_and_preserves_custom_config(
             min_wait_timeout_ms: Some(2500),
             ..Default::default()
         })),
+        network_proxy: Some(FeatureToml::Config(crate::NetworkProxyConfigToml {
+            enabled: Some(false),
+            proxy_url: Some("http://127.0.0.1:43128".to_string()),
+            ..Default::default()
+        })),
         entries: BTreeMap::from([("include_apply_patch_tool".to_string(), true)]),
         ..Default::default()
     };
@@ -583,6 +589,14 @@ fn materialize_resolved_enabled_writes_all_features_and_preserves_custom_config(
             ..Default::default()
         }))
     );
+    assert_eq!(
+        features_toml.network_proxy,
+        Some(FeatureToml::Config(crate::NetworkProxyConfigToml {
+            enabled: Some(true),
+            proxy_url: Some("http://127.0.0.1:43128".to_string()),
+            ..Default::default()
+        }))
+    );
     let replayed = Features::from_sources(
         FeatureConfigSource {
             features: Some(&features_toml),