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capture_ai_immediate and capture_ai_batch_immediate now apply the 8 MiB per-event limit before sending, like the background AI lane. An event over the limit is not sent and gets a local drop verdict with the detail ai_event_too_big in the returned CaptureSummary.
… its own backoff max_capture_attempts now defaults to 4 and retry_initial_backoff_ms to 100. Remote /flags retries use a fixed backoff of 300 ms, doubling up to 30 s, instead of the capture retry options.
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The test read each event's uuid before capture; setting it explicitly keeps the test independent of when the SDK assigns uuids. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Oct 13, 2026
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💡 Motivation and Context
The immediate AI methods sent events over the 8 MiB limit and let PostHog refuse them, while the background lane already dropped them locally. Retry defaults also differed from the other PostHog SDKs.
Changes
capture_ai_immediateandcapture_ai_batch_immediateno longer send an event whose properties exceed 8 MiB.CaptureSummaryreports it as adropwith detailai_event_too_big, counted insubmitted()./flagsretries get their own backoff: 300 ms, doubling up to 30 s.💚 How did you test it?
/flagsbackoff each fails a test.🤖 Generated with Claude Code