diff --git a/src/hack_forked/utils/lsp/lsp.ml b/src/hack_forked/utils/lsp/lsp.ml
index 112151b2f2f..944246f4004 100644
--- a/src/hack_forked/utils/lsp/lsp.ml
+++ b/src/hack_forked/utils/lsp/lsp.ml
@@ -568,7 +568,10 @@ module Initialize = struct
     | Messages
     | Verbose
 
-  and initializationOptions = { liveSyntaxErrors: bool }
+  and initializationOptions = {
+    liveSyntaxErrors: bool;
+    detailedErrorRendering: bool option;
+  }
 
   and client_capabilities = {
     workspace: workspaceClientCapabilities;
diff --git a/src/hack_forked/utils/lsp/lsp.mli b/src/hack_forked/utils/lsp/lsp.mli
index 895fef97e04..f7c48924c85 100644
--- a/src/hack_forked/utils/lsp/lsp.mli
+++ b/src/hack_forked/utils/lsp/lsp.mli
@@ -422,7 +422,10 @@ module Initialize : sig
     | Messages
     | Verbose
 
-  and initializationOptions = { liveSyntaxErrors: bool }
+  and initializationOptions = {
+    liveSyntaxErrors: bool;
+    detailedErrorRendering: bool option;
+  }
 
   and client_capabilities = {
     workspace: workspaceClientCapabilities;
diff --git a/src/hack_forked/utils/lsp/lsp_fmt.ml b/src/hack_forked/utils/lsp/lsp_fmt.ml
index dee8ad6cc1d..1612223d380 100644
--- a/src/hack_forked/utils/lsp/lsp_fmt.ml
+++ b/src/hack_forked/utils/lsp/lsp_fmt.ml
@@ -1375,7 +1375,17 @@ let parse_initialize (params : json option) : Initialize.params =
       | Some "verbose" -> Verbose
       | _ -> Off
     and parse_initializationOptions json =
-      { liveSyntaxErrors = Jget.bool_d json "liveSyntaxErrors" ~default:true }
+      {
+        liveSyntaxErrors = Jget.bool_d json "liveSyntaxErrors" ~default:true;
+        detailedErrorRendering =
+          (match Jget.bool_opt json "detailedErrorRendering" with
+          | Some b -> Some b
+          | None ->
+            (match Jget.string_opt json "detailedErrorRendering" with
+            | Some "true" -> Some true
+            | Some "false" -> Some false
+            | _ -> None));
+      }
     and parse_capabilities json =
       {
         workspace = Jget.obj_opt json "workspace" |> parse_workspace;
diff --git a/src/server/command_handler/commandHandler.ml b/src/server/command_handler/commandHandler.ml
index c912dce728e..9603f97f12b 100644
--- a/src/server/command_handler/commandHandler.ml
+++ b/src/server/command_handler/commandHandler.ml
@@ -1191,9 +1191,13 @@ let linked_editing_range ~options ~env ~profiling ~params ~client =
     )
 
 let vscode_detailed_diagnostics ~options client =
+  let client_config = Persistent_connection.client_config client in
+  let lsp_initialize_params = Persistent_connection.lsp_initialize_params client in
   Persistent_connection.Client_config.detailed_error_rendering_merge_with_options
     ~flowconfig_enabled:(Options.vscode_detailed_diagnostics options)
-    (Persistent_connection.client_config client)
+    ~client_init_options_enabled:
+      Lsp.Initialize.(lsp_initialize_params.initializationOptions.detailedErrorRendering)
+    client_config
 
 let rank_autoimports_by_usage ~options client =
   let client_config = Persistent_connection.client_config client in
diff --git a/src/server/persistent_connection/persistent_connection.ml b/src/server/persistent_connection/persistent_connection.ml
index 5bc06dbfb0a..6ccc74f759f 100644
--- a/src/server/persistent_connection/persistent_connection.ml
+++ b/src/server/persistent_connection/persistent_connection.ml
@@ -23,9 +23,9 @@ module Client_config = struct
   let detailed_error_rendering { detailed_error_rendering; _ } = detailed_error_rendering
 
   let detailed_error_rendering_merge_with_options
-      ~flowconfig_enabled { detailed_error_rendering; _ } =
+      ~flowconfig_enabled ~client_init_options_enabled { detailed_error_rendering; _ } =
     match detailed_error_rendering with
-    | Default -> flowconfig_enabled
+    | Default -> Base.Option.value client_init_options_enabled ~default:flowconfig_enabled
     | True -> true
     | False -> false
 
@@ -116,6 +116,8 @@ let send_errors =
     let vscode_detailed_diagnostics =
       Client_config.detailed_error_rendering_merge_with_options
         ~flowconfig_enabled:flowconfig_vscode_detailed_diagnostics
+        ~client_init_options_enabled:
+          Lsp.Initialize.(client.lsp_initialize_params.initializationOptions.detailedErrorRendering)
         client.client_config
     in
     let diagnostics =
diff --git a/src/server/persistent_connection/persistent_connection.mli b/src/server/persistent_connection/persistent_connection.mli
index b9cc9f724fd..ac9236ad6ca 100644
--- a/src/server/persistent_connection/persistent_connection.mli
+++ b/src/server/persistent_connection/persistent_connection.mli
@@ -25,7 +25,8 @@ module Client_config : sig
 
   val detailed_error_rendering : t -> client_toggle
 
-  val detailed_error_rendering_merge_with_options : flowconfig_enabled:bool -> t -> bool
+  val detailed_error_rendering_merge_with_options :
+    flowconfig_enabled:bool -> client_init_options_enabled:bool option -> t -> bool
 
   val rank_autoimports_by_usage : t -> client_toggle