diff --git a/codex-rs/core/src/config/schema.rs b/codex-rs/core/src/config/schema.rs
index 86513d0b6d..dad2cd8951 100644
--- a/codex-rs/core/src/config/schema.rs
+++ b/codex-rs/core/src/config/schema.rs
@@ -34,7 +34,7 @@ pub(crate) fn write_config_schema(out_path: &Path) -> anyhow::Result<()> {
     Ok(())
 }
 
-/// Schema for the `[features]` map with known keys only.
+/// Schema for the `[features]` map with known + legacy keys only.
 pub(crate) fn features_schema(schema_gen: &mut SchemaGenerator) -> Schema {
     let mut object = SchemaObject {
         instance_type: Some(InstanceType::Object.into()),
@@ -47,6 +47,11 @@ pub(crate) fn features_schema(schema_gen: &mut SchemaGenerator) -> Schema {
             .properties
             .insert(feature.key.to_string(), schema_gen.subschema_for::<bool>());
     }
+    for legacy_key in crate::features::legacy_feature_keys() {
+        validation
+            .properties
+            .insert(legacy_key.to_string(), schema_gen.subschema_for::<bool>());
+    }
     validation.additional_properties = Some(Box::new(Schema::Bool(false)));
     object.object = Some(Box::new(validation));
 
diff --git a/codex-rs/core/src/features.rs b/codex-rs/core/src/features.rs
index bff8338511..2f843d224b 100644
--- a/codex-rs/core/src/features.rs
+++ b/codex-rs/core/src/features.rs
@@ -16,6 +16,7 @@ use std::collections::BTreeSet;
 
 mod legacy;
 pub(crate) use legacy::LegacyFeatureToggles;
+pub(crate) use legacy::legacy_feature_keys;
 
 /// High-level lifecycle stage for a feature.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
diff --git a/codex-rs/core/src/features/legacy.rs b/codex-rs/core/src/features/legacy.rs
index ed508ffb5a..2b5a9e7fe0 100644
--- a/codex-rs/core/src/features/legacy.rs
+++ b/codex-rs/core/src/features/legacy.rs
@@ -31,6 +31,10 @@ const ALIASES: &[Alias] = &[
     },
 ];
 
+pub(crate) fn legacy_feature_keys() -> impl Iterator<Item = &'static str> {
+    ALIASES.iter().map(|alias| alias.legacy_key)
+}
+
 pub(crate) fn feature_for_key(key: &str) -> Option<Feature> {
     ALIASES
         .iter()
diff --git a/docs/config.schema.json b/docs/config.schema.json
index bb8083939f..e8372f0990 100644
--- a/docs/config.schema.json
+++ b/docs/config.schema.json
@@ -78,15 +78,27 @@
         "elevated_windows_sandbox": {
           "type": "boolean"
         },
+        "enable_experimental_windows_sandbox": {
+          "type": "boolean"
+        },
         "enable_request_compression": {
           "type": "boolean"
         },
         "exec_policy": {
           "type": "boolean"
         },
+        "experimental_use_freeform_apply_patch": {
+          "type": "boolean"
+        },
+        "experimental_use_unified_exec_tool": {
+          "type": "boolean"
+        },
         "experimental_windows_sandbox": {
           "type": "boolean"
         },
+        "include_apply_patch_tool": {
+          "type": "boolean"
+        },
         "powershell_utf8": {
           "type": "boolean"
         },
@@ -111,6 +123,9 @@
         "unified_exec": {
           "type": "boolean"
         },
+        "web_search": {
+          "type": "boolean"
+        },
         "web_search_cached": {
           "type": "boolean"
         },
@@ -474,15 +489,27 @@
             "elevated_windows_sandbox": {
               "type": "boolean"
             },
+            "enable_experimental_windows_sandbox": {
+              "type": "boolean"
+            },
             "enable_request_compression": {
               "type": "boolean"
             },
             "exec_policy": {
               "type": "boolean"
             },
+            "experimental_use_freeform_apply_patch": {
+              "type": "boolean"
+            },
+            "experimental_use_unified_exec_tool": {
+              "type": "boolean"
+            },
             "experimental_windows_sandbox": {
               "type": "boolean"
             },
+            "include_apply_patch_tool": {
+              "type": "boolean"
+            },
             "powershell_utf8": {
               "type": "boolean"
             },
@@ -507,6 +534,9 @@
             "unified_exec": {
               "type": "boolean"
             },
+            "web_search": {
+              "type": "boolean"
+            },
             "web_search_cached": {
               "type": "boolean"
             },