fix(slack): rotate long native streams before expiry - #884
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Signed-off-by: dcbuild3r <dcbuilder@pm.me>
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Slack expires native streams after roughly five minutes, so long replies are continued in a new message. Rotation now waits for a paragraph break (up to a 30s grace) and carries the leading text out with the old segment's stop call, closes and reopens code fences with CommonMark semantics, repeats a table header when a table continues, replays the plan and open task cards, keeps the agent session in processing, and flushes the new segment's first append immediately. The segment clock starts at the first call Slack accepts rather than at construction, rotation only runs when there is text to send, and streamSegmentMaxAgeMs treats non-positive or NaN values as the default and Infinity as never. A segment Slack already expired during an idle gap is recovered by resending unconfirmed text in a new message instead of failing the reply. Signed-off-by: Ben Sabic <bensabic@users.noreply.github.com>
Document how long native streams are continued across messages: the paragraph-break rotation and grace window, fence and table handling, task card replay, agent session status, the Infinity opt-out, and which message thread.post() returns. Signed-off-by: Ben Sabic <bensabic@users.noreply.github.com>
bensabic
approved these changes
Sep 4, 2026
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Summary
Slack expires native streams after roughly five minutes. Finalize long-running streams after four minutes by default and continue in a fresh segment so late appends do not fail with message_not_in_streaming_state. Preserve open fenced code blocks by closing and reopening them across the segment boundary. The threshold is configurable with streamSegmentMaxAgeMs.
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