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CodecFork.generateVideoFramesLibav and generateVideoFramesGstreamer are async generator functions, so their bodies -- including the call_later(10, timeoutExit) that lets the worker kill itself -- do not run until the caller requests the first frame. The PluginFork handle is discarded at handout in LibavGenerator and GstreamerGenerator, so a worker that is handed a session but never iterated has no watchdog and no reachable terminate(), and idles for the life of the plugin host. aclose() on a never-started async generator returns without executing the body, so even a consumer that closes the RPC proxy cannot trigger the self-destruct. Make the two methods coroutines that return the inner generator. rpc.py does await maybe_await(invoke(*args)) before serializing, so the async iterator proxy seen by the caller is unchanged, but the watchdog is armed as soon as the fork is committed to a session. Also keep the PluginFork handle at the call sites and terminate it if the session cannot be handed to the caller. Fixes #2138 Claude-Session: https://claude.ai/code/session_018kjDzffi8VZKA1mn6nrGfo Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>