diff --git a/codex-rs/app-server/src/request_processors/config_processor.rs b/codex-rs/app-server/src/request_processors/config_processor.rs
index 0d09d2503c72..9cef41e3dd7e 100644
--- a/codex-rs/app-server/src/request_processors/config_processor.rs
+++ b/codex-rs/app-server/src/request_processors/config_processor.rs
@@ -50,6 +50,7 @@ use std::path::PathBuf;
 
 const SUPPORTED_EXPERIMENTAL_FEATURE_ENABLEMENT: &[&str] = &[
     "auth_elicitation",
+    "mcp_2026_07_28",
     "memories",
     "mentions_v2",
     "remote_control",
diff --git a/codex-rs/core/config.schema.json b/codex-rs/core/config.schema.json
index 982e3ea8a16c..e6ec8d92c227 100644
--- a/codex-rs/core/config.schema.json
+++ b/codex-rs/core/config.schema.json
@@ -566,6 +566,9 @@
             "local_thread_store_compression": {
               "type": "boolean"
             },
+            "mcp_2026_07_28": {
+              "type": "boolean"
+            },
             "memories": {
               "type": "boolean"
             },
@@ -5039,6 +5042,9 @@
         "local_thread_store_compression": {
           "type": "boolean"
         },
+        "mcp_2026_07_28": {
+          "type": "boolean"
+        },
         "memories": {
           "type": "boolean"
         },
diff --git a/codex-rs/features/src/lib.rs b/codex-rs/features/src/lib.rs
index f027f5c997ea..d291dbeffa4c 100644
--- a/codex-rs/features/src/lib.rs
+++ b/codex-rs/features/src/lib.rs
@@ -160,6 +160,8 @@ pub enum Feature {
     Apps,
     /// Enable MCP apps.
     EnableMcpApps,
+    /// Enable MCP protocol version 2026-07-28 support.
+    Mcp20260728,
     /// Removed compatibility flag for the legacy Apps MCP path override.
     AppsMcpPathOverride,
     /// Removed compatibility flag retained as a no-op now that tool_search is always enabled.
@@ -1081,6 +1083,12 @@ pub const FEATURES: &[FeatureSpec] = &[
         stage: Stage::UnderDevelopment,
         default_enabled: false,
     },
+    FeatureSpec {
+        id: Feature::Mcp20260728,
+        key: "mcp_2026_07_28",
+        stage: Stage::UnderDevelopment,
+        default_enabled: false,
+    },
     FeatureSpec {
         id: Feature::AppsMcpPathOverride,
         key: "apps_mcp_path_override",