Kyle Carberry
a40716b6fe
## Problem
The WebSocket handler for `diff_status_change` events in
`AgentsPage.tsx` was triggering a burst of redundant HTTP requests on
every event:
1. **`invalidateChatListQueries(queryClient)`** — Full refetch of the
chats list endpoint. Unnecessary because `updateInfiniteChatsCache`
already writes `diff_status` into the sidebar cache optimistically on
every event.
2. **`invalidateQueries({ queryKey: chatKey(id) })`** — Refetch of the
individual chat. Also unnecessary — the SSE event carries `diff_status`
in its payload and the optimistic updater writes it into the `chatKey`
cache directly. Worse, this call was missing `exact: true`, so TanStack
Query's prefix matching cascaded the invalidation to `chatMessagesKey`,
`chatDiffContentsKey`, and every other query under `["chats", id]`.
Since diff status changes fire frequently during active agent work, this
spammed the chats list endpoint and caused redundant refetches of
messages and diff contents on every single event.
## Fix
Strip the handler down to the one invalidation that's actually needed —
`chatDiffContentsKey` (the file-level diff contents aren't in the SSE
payload):
```typescript
if (chatEvent.kind === "diff_status_change") {
void queryClient.invalidateQueries({
queryKey: chatDiffContentsKey(updatedChat.id),
exact: true,
});
}
```
## Why tests didn't catch this
The existing tests in `chats.test.ts` cover query utilities in isolation
(e.g. `invalidateChatListQueries` scoping, mutation invalidation). The
WebSocket event handler lives in the `AgentsPage` component — there was
no test covering what the `diff_status_change` code path actually
invalidates.
Added regression tests verifying that `exact: true` prevents
prefix-match cascade vs the old behavior.
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