diff --git a/src/agent-client-protocol-core/Cargo.toml b/src/agent-client-protocol-core/Cargo.toml
index b331dfb..df7705e 100644
--- a/src/agent-client-protocol-core/Cargo.toml
+++ b/src/agent-client-protocol-core/Cargo.toml
@@ -16,15 +16,25 @@ default = []
 # Forward unstable features from agent-client-protocol-schema.
 # Enable these to get support for the corresponding unstable ACP methods.
 unstable = [
-    "unstable_session_model",
+    "unstable_auth_methods",
+    "unstable_boolean_config",
+    "unstable_message_id",
+    "unstable_session_additional_directories",
+    "unstable_session_close",
     "unstable_session_fork",
+    "unstable_session_model",
     "unstable_session_resume",
-    "unstable_session_close",
+    "unstable_session_usage",
 ]
-unstable_session_model = ["agent-client-protocol-schema/unstable_session_model"]
+unstable_auth_methods = ["agent-client-protocol-schema/unstable_auth_methods"]
+unstable_boolean_config = ["agent-client-protocol-schema/unstable_boolean_config"]
+unstable_message_id = ["agent-client-protocol-schema/unstable_message_id"]
+unstable_session_additional_directories = ["agent-client-protocol-schema/unstable_session_additional_directories"]
+unstable_session_close = ["agent-client-protocol-schema/unstable_session_close"]
 unstable_session_fork = ["agent-client-protocol-schema/unstable_session_fork"]
+unstable_session_model = ["agent-client-protocol-schema/unstable_session_model"]
 unstable_session_resume = ["agent-client-protocol-schema/unstable_session_resume"]
-unstable_session_close = ["agent-client-protocol-schema/unstable_session_close"]
+unstable_session_usage = ["agent-client-protocol-schema/unstable_session_usage"]
 
 [dependencies]
 agent-client-protocol-schema.workspace = true