diff --git a/plugins/monaco-editor/server.ts b/plugins/monaco-editor/server.ts
index dd7ae8135..2d8b0e042 100644
--- a/plugins/monaco-editor/server.ts
+++ b/plugins/monaco-editor/server.ts
@@ -48,7 +48,5 @@ const sourceSchema = z
     threadId: z.string().nullable(),
     environmentId: z.string().nullable(),
     projectId: z.string().nullable(),
-    /** Set for a project-backed workspace file opened on a non-primary host. */
-    experimental_hostId: z.string().optional(),
   })
   .strict();