diff --git a/rpc-toolkit/src/handler/adapters.rs b/rpc-toolkit/src/handler/adapters.rs
index 5b1c5af..edd50fc 100644
--- a/rpc-toolkit/src/handler/adapters.rs
+++ b/rpc-toolkit/src/handler/adapters.rs
@@ -483,7 +483,7 @@ where
         self.handler.metadata(method, ctx_ty)
     }
     fn contexts(&self) -> Option<OrdSet<TypeId>> {
-        todo!()
+        Self::Context::type_ids()
     }
     fn method_from_dots(&self, method: &str, ctx_ty: TypeId) -> Option<VecDeque<&'static str>> {
         self.handler.method_from_dots(method, ctx_ty)