diff --git a/packages/server/src/server/agent/providers/omp/rpc-types.ts b/packages/server/src/server/agent/providers/omp/rpc-types.ts
index c97a3b7f3..31a057291 100644
--- a/packages/server/src/server/agent/providers/omp/rpc-types.ts
+++ b/packages/server/src/server/agent/providers/omp/rpc-types.ts
@@ -149,7 +149,7 @@ export const OmpRpcSlashCommandSchema = z
   .object({
     name: z.string(),
     description: z.string().optional(),
-    source: z.enum(["extension", "prompt", "skill", "builtin"]),
+    source: z.string().optional(),
     sourceInfo: z.record(z.string(), z.unknown()).optional(),
     input: z.object({ hint: z.string().optional() }).passthrough().nullable().optional(),
   })