Fix: skip resume cursor when switching providers

cursoragent · cursoragent · commit 966209c2b5bf · 2026-02-27T22:36:28.000Z
Resume cursors are provider-specific opaque state and must not be
forwarded across provider boundaries. When providerChanged is true,
set resumeCursor to undefined instead of resolving the old provider's
cursor, which would be misinterpreted by the new provider.
diff --git a/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts b/apps/server/src/orchestration/Layers/ProviderCommandReactor.ts
@@ -211,7 +211,7 @@ const make = Effect.gen(function* () {
         return existingSessionId;
       }
 
-      const resumeCursor = yield* resolveResumeCursorForSession(existingSessionId);
+      const resumeCursor = providerChanged ? undefined : (yield* resolveResumeCursorForSession(existingSessionId));
       const restartedSession = yield* startProviderSession({
         ...(resumeCursor !== undefined ? { resumeCursor } : {}),
         ...(options?.provider !== undefined ? { provider: options.provider } : {}),

Original file line number	Diff line number	Diff line change
`@@ -211,7 +211,7 @@ const make = Effect.gen(function* () {`
`211`	`211`	`return existingSessionId;`
`212`	`212`	`}`
`213`	`213`
`214`		`- const resumeCursor = yield* resolveResumeCursorForSession(existingSessionId);`
	`214`	`+ const resumeCursor = providerChanged ? undefined : (yield* resolveResumeCursorForSession(existingSessionId));`
`215`	`215`	`const restartedSession = yield* startProviderSession({`
`216`	`216`	`...(resumeCursor !== undefined ? { resumeCursor } : {}),`
`217`	`217`	`...(options?.provider !== undefined ? { provider: options.provider } : {}),`