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Re-review of the reversed doc came back APPROVE_WITH_MINOR. The reversal itself was verified complete (worktree-wide grep: no surviving impossibility claim) and NOT over-claimed in the other direction (the reviewer recomputed every headline number from the committed messagedisplay-deltas.jsonl and re-ran the invariant on two further turns: 4 independent turns total, 5/6/4/18 fires, 609/696/239/1973 bytes, concat(deltas) === T TRUE in all four). But two additive caveats were missing, and both are load-bearing for the streaming PR now in flight: 1. CONCURRENCY DEMUX (severe, and live TODAY — not a warm-pool future problem). OCP_TUI_MAX_CONCURRENT defaults to 2, so two `claude` processes already run concurrently. One MessageDisplay hook writing to one shared sink would INTERLEAVE deltas from two different turns into a single stream — request A's client receiving request B's text. A single-request test never surfaces it. The payload carries session_id, so the sink must be keyed by it (which also keeps the design warm-pool compatible: a pre-booted pane's session-id is fixed at boot, so one static hook script serves every pane). Documented, with the required ≥2-concurrent-request test. 2. THINKING-EXCLUSION IS NOT STRESS-TESTED (severe if wrong). The exclusion was inferred from a code snippet that turns out to be the final:true call site, not the incremental one. Four live turns showed no thinking in any delta — but every transcript's thinking block was EMPTY (thinking:"", 0 chars), so it was never actually stressed. If thinking deltas do fire on Opus/xhigh, concat(deltas) !== T AND OCP streams the model's private reasoning to the caller; the concat === T assertion detects that but cannot un-send an SSE delta. Flagged as a must-verify-before-shipping item. Also: the "5-7 chunks per answer" figure is size-dependent (18 fires on a ~2 KB answer) — rescoped to "once per rendered block, scales with answer length" in both the doc and the README, so no implementer hard-codes a chunk-count assumption. Both caveats were relayed to the streaming implementation immediately rather than waiting for this merge. Docs-only. No code change, no version bump. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VqgWJcjxrjjL9L9SkpZyXR