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custom-agent-loop-fixes.md

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@trigger.dev/sdk patch

Three fixes for custom agent loops (chat.customAgent, chat.createSession, and hand-rolled MessageAccumulator loops):

  • Continuation runs no longer replay already-answered user messages into the first turn. The .in resume cursor is now seeded before any listener attaches (the same boot logic chat.agent uses), so a chat that continues after a cancel, crash, or upgrade only sees genuinely new messages.
  • Steering a hand-rolled loop mid-stream no longer wipes the in-flight assistant response. chat.pipeAndCapture now stamps a server-generated message id on the stream, so a prepareStep injection keeps the partial text instead of replacing the message.
  • Task-backed tools (ai.toolExecute) now work from custom agent loops: the parent's session is threaded to the child run, so child tasks can stream progress into the chat with chat.stream.writer({ target: "root" }) instead of failing with "session handle is not initialized".