diff --git a/codex-rs/core/src/config/network_config.rs b/codex-rs/core/src/config/network_config.rs
index e703387513..fbc5989347 100644
--- a/codex-rs/core/src/config/network_config.rs
+++ b/codex-rs/core/src/config/network_config.rs
@@ -15,9 +15,7 @@ use codex_features::FeatureToml;
 use codex_features::FeaturesToml;
 use codex_network_proxy::EnvironmentNetworkPolicy;
 use codex_network_proxy::NetworkProxyConfig;
-use codex_network_proxy::NetworkProxyConstraints;
 use codex_network_proxy::NetworkProxyExecutorOs;
-use codex_network_proxy::build_config_state;
 use codex_protocol::models::PermissionProfile;
 
 use super::NetworkProxySpec;
@@ -27,16 +25,14 @@ use super::permissions::apply_network_proxy_feature_config;
 #[error("invalid portable environment network policy")]
 pub struct EnvironmentNetworkConfigError;
 
-/// Drops listener addresses, which the executor chooses for each command, before
-/// validating an environment's selected network configuration. Use the returned
-/// value when deciding whether a policy is present and when preparing it.
+/// Drops listener addresses and rejects unsupported controller fields in an
+/// environment's selected network configuration. Use the returned value when
+/// deciding whether a policy is present and when preparing it.
 ///
-/// Socket policy validation uses the supplied executor OS: Allow keys must be
-/// NUL-free and absolute for that OS; Deny keys are preserved unchanged.
-/// Path normalization and socket support are determined by the executor.
+/// Domain and socket values may be replaced by feature settings or requirements.
+/// Validate the composed policy with [`validate_environment_network_policy`].
 pub fn project_environment_profile_network(
     network: Option<NetworkToml>,
-    executor_os: NetworkProxyExecutorOs,
 ) -> Result<Option<NetworkToml>, EnvironmentNetworkConfigError> {
     let Some(mut network) = network else {
         return Ok(None);
@@ -55,15 +51,6 @@ pub fn project_environment_profile_network(
     if network != supported {
         return Err(EnvironmentNetworkConfigError);
     }
-    // Reuse shared, host-independent policy validation.
-    // With MITM and credentials excluded, this checks patterns and allowed
-    // socket paths without discovering executor files.
-    build_config_state(
-        network.to_network_proxy_config(),
-        NetworkProxyConstraints::default(),
-        executor_os,
-    )
-    .map_err(|_| EnvironmentNetworkConfigError)?;
     Ok(Some(network))
 }
 
diff --git a/codex-rs/core/src/config/network_config_tests.rs b/codex-rs/core/src/config/network_config_tests.rs
index 27bbcbdcfd..6b3616fac2 100644
--- a/codex-rs/core/src/config/network_config_tests.rs
+++ b/codex-rs/core/src/config/network_config_tests.rs
@@ -2,6 +2,8 @@
 
 use super::*;
 use codex_config::RequirementSource;
+use codex_network_proxy::NetworkProxyConstraints;
+use codex_network_proxy::build_config_state;
 use pretty_assertions::assert_eq;
 
 #[test]
@@ -38,7 +40,7 @@ fn environment_policy_presence_keeps_selected_and_managed_denials() {
 }
 
 #[test]
-fn attachment_projection_uses_executor_os_and_drops_listener_addresses() {
+fn attachment_projection_preserves_policy_and_drops_listener_addresses() {
     for executor_os in [
         NetworkProxyExecutorOs::Linux,
         NetworkProxyExecutorOs::Macos,
@@ -108,24 +110,20 @@ allow_local_binding = false
                 ..expected.clone()
             };
             assert_eq!(
-                project_environment_profile_network(Some(network), executor_os),
-                if accepted {
-                    Ok(Some(expected))
-                } else {
-                    Err(EnvironmentNetworkConfigError)
-                },
+                project_environment_profile_network(Some(network)),
+                Ok(Some(expected)),
                 "projection: {executor_os:?}, {raw}"
             );
         }
         assert_eq!(
-            project_environment_profile_network(/*network*/ None, executor_os),
+            project_environment_profile_network(/*network*/ None),
             Ok(None)
         );
     }
 }
 
 #[test]
-fn attachment_projection_rejects_unsupported_restrictions_and_invalid_policy() {
+fn attachment_projection_rejects_unsupported_restrictions_and_defers_policy_validation() {
     for raw in [
         "mode = 'full'",
         "mode = 'limited'",
@@ -138,16 +136,76 @@ methods = ['GET']
 path_prefixes = ['/']
 action = ['redact']
 "#,
+    ] {
+        let network: NetworkToml = toml::from_str(raw).unwrap();
+        assert_eq!(
+            project_environment_profile_network(Some(network)),
+            Err(EnvironmentNetworkConfigError),
+            "{raw}"
+        );
+    }
+
+    for raw in [
         "[unix_sockets]\n'relative.sock' = 'allow'",
         "[unix_sockets]\n'~/allowed.sock' = 'allow'",
         "[unix_sockets]\n\"/tmp/\\u0000allowed.sock\" = 'allow'",
         "[domains]\n'[' = 'allow'",
     ] {
         let network: NetworkToml = toml::from_str(raw).unwrap();
+        let projected = project_environment_profile_network(Some(network.clone()))
+            .unwrap()
+            .unwrap();
+        assert_eq!(projected, network);
+        let configured_proxy = projected.to_network_proxy_config();
+        let policy = EnvironmentNetworkPolicy::from_config(
+            &configured_proxy,
+            /*managed_allowed_domains_only*/ false,
+        );
         assert_eq!(
-            project_environment_profile_network(Some(network), NetworkProxyExecutorOs::Unknown),
+            validate_environment_network_policy(
+                &policy,
+                &PermissionProfile::read_only(),
+                NetworkProxyExecutorOs::Unknown,
+            ),
             Err(EnvironmentNetworkConfigError),
             "{raw}"
         );
+
+        // Managed requirements replace the invalid Allow entries before validation.
+        let policy = PreparedNetworkConfig { configured_proxy }
+            .build_environment_policy(
+                Some(Sourced::new(
+                    NetworkConstraints {
+                        enabled: Some(true),
+                        managed_allowed_domains_only: Some(true),
+                        unix_sockets: Some(Default::default()),
+                        ..Default::default()
+                    },
+                    RequirementSource::Unknown,
+                )),
+                &PermissionProfile::read_only(),
+                /*has_selected_policy*/ true,
+            )
+            .unwrap()
+            .unwrap();
+        assert_eq!(
+            policy,
+            EnvironmentNetworkPolicy::from_config(
+                &NetworkProxyConfig {
+                    unix_sockets: Some(Default::default()),
+                    ..Default::default()
+                },
+                /*managed_allowed_domains_only*/ true,
+            )
+        );
+        assert_eq!(
+            validate_environment_network_policy(
+                &policy,
+                &PermissionProfile::read_only(),
+                NetworkProxyExecutorOs::Unknown,
+            ),
+            Ok(()),
+            "{raw}"
+        );
     }
 }