fix: preserve existing runtimePayload fields when sendTurn upserts binding

cursoragent · cursoragent · commit 2c97a21b072b · 2026-03-24T22:48:01.000Z
sendTurn was constructing a fresh runtimePayload with only modelSelection,
activeTurnId, lastRuntimeEvent, and lastRuntimeEventAt—completely overwriting
persisted fields like cwd, model, and providerOptions set during startSession.

Now reads the existing binding's runtimePayload and spreads it as the base,
so fields persisted by startSession survive through sendTurn updates.
diff --git a/apps/server/src/provider/Layers/ProviderService.ts b/apps/server/src/provider/Layers/ProviderService.ts
@@ -368,12 +368,20 @@ const makeProviderService = (options?: ProviderServiceLiveOptions) =>
           allowRecovery: true,
         });
         const turn = yield* routed.adapter.sendTurn(input);
+        const existingBinding = Option.getOrUndefined(yield* directory.getBinding(input.threadId));
+        const existingPayload =
+          existingBinding?.runtimePayload &&
+          typeof existingBinding.runtimePayload === "object" &&
+          !Array.isArray(existingBinding.runtimePayload)
+            ? existingBinding.runtimePayload
+            : {};
         yield* directory.upsert({
           threadId: input.threadId,
           provider: routed.adapter.provider,
           status: "running",
           ...(turn.resumeCursor !== undefined ? { resumeCursor: turn.resumeCursor } : {}),
           runtimePayload: {
+            ...existingPayload,
             ...(input.modelSelection !== undefined ? { modelSelection: input.modelSelection } : {}),
             activeTurnId: turn.turnId,
             lastRuntimeEvent: "provider.sendTurn",
