diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index b88b7c1..d4c151b 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -6,7 +6,7 @@ on:
       - main
 
 jobs:
-  publish:
+  ok:
     runs-on: ubuntu-latest
 
     permissions:
diff --git a/xrpc-server/stream/stream.ts b/xrpc-server/stream/stream.ts
index b509d8f..458aba6 100644
--- a/xrpc-server/stream/stream.ts
+++ b/xrpc-server/stream/stream.ts
@@ -114,14 +114,16 @@ export function iterateBinary(ws: WebSocket): AsyncIterable<Uint8Array> {
 }
 
 /** Iterate by low-level Frame (binary in → Frame out) */
-export async function* byFrame(ws: WebSocket) {
+export async function* byFrame(ws: WebSocket): AsyncGenerator<Frame> {
   for await (const chunk of iterateBinary(ws)) {
     yield Frame.fromBytes(chunk);
   }
 }
 
 /** Iterate by validated MessageFrame (errors throw XRPCError) */
-export async function* byMessage(ws: WebSocket) {
+export async function* byMessage(
+  ws: WebSocket,
+): AsyncGenerator<MessageFrame<unknown>> {
   for await (const chunk of iterateBinary(ws)) {
     yield ensureChunkIsMessage(chunk);
   }