[core] Bound event pagination against non-progressing pages#2187
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[core] Bound event pagination against non-progressing pages#2187VaguelySerious wants to merge 2 commits into
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A backend that keeps returning fresh cursors with empty or fully-overlapping pages while reporting `hasMore: true` would spin the `loadWorkflowRunEvents` loop forever — the existing cursor guards only catch a cursor that repeats a previously requested value, and `appendUniqueEvents` keeps the result flat instead of growing. Treat a non-final page that adds zero new events as a world contract error. This fully closes the non-progression hole without an arbitrary page-count cap. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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VaguelySerious
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May 31, 2026
Signed-off-by: Peter Wielander <mittgfu@gmail.com>
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Follow-up to #2179 (comment) which hardened event list cursor parsing, to further protect it against cursor llops.
These changes specifically protect against a backend that restarts the read at the beginning (it re-issues a cursor we already requested). It does not bound the loop against a backend that keeps returning fresh cursors with empty or fully-overlapping pages while reporting
hasMore: true: no cursor ever repeats,appendUniqueEventskeeps the result flat, andwhile (hasMore)spins forever.The change is to treat a non-final page that adds zero new events as a
WORLD_CONTRACT_ERROR. A legitimate non-final page over an ascending cursor must surface at least one event after the cursor, so this can't false-positive on large runs — and it needs no arbitrary page-count cap (avoids a magic number that would need sizing above the largest legitimate run).