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The workflow thread cannot see where the store's tail is, so the transport records the request, the Worker resolves it against the store after the task that opened the subscription, and the marker records the boundary so replay reads it from History.
…rds. stream_reader(after=END) and stream_reader(last=N) on the Redis provider now ask the transport for a tail start instead of being refused.
A reader at the newest N records and one at END each start where the live run resolved, and replay starts there too.
This was referenced Oct 3, 2026
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This PR lets a workflow reader on the Redis provider start at the tail or at the newest N records.
What changed?
StartAtTail,subscribe(start_at_tail=), atail_cursor()hook on the backend, andresolve_pending_starts(), which the Worker calls before a completion goes out.RedisStreamsanswersstream_reader(after=END)andstream_reader(last=N)through that path instead of refusing.Part of AI-198 (epic AI-37).
Why?
The workflow thread can't ask the store where its tail is. So the transport records the request, and the Worker resolves it against the store after the task that opened the subscription. The marker records the boundary beside the subscription, so replay and a cold start read it from History and never ask the store again.
How did you test it?
Link to a test plan if any -
poe lintis clean, and the transport commit type-checks and passes its tests on its own. The external stream suite passes on the dev server. The streams suite withSTREAMS_LIVE=redispasses against a channel server and a local Redis, including a reader at the newest N and one atEND, each replayed.