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Three follow-ups from the runtime design review:
Transcript prefix dedup (storage-level, transparent):
- A session turn's input starts with the previous turn's closed transcript
(copy-forward); storing it again made session storage quadratic and every
fact append rewrote the whole transcript. Stores now keep only the suffix
past prefix_length and recompute the prefix on read from the immutable
previous turn (closedTranscript moved to agent-loop/types.ts; shared
split/join helpers in prefix-dedup.ts with loud tripwires).
- Opportunistic: input that doesn't extend the previous transcript (e.g.
future compaction summaries) falls back to whole-row storage. Nothing
above the stores changed; InMemoryTurnStore mirrors SQLite exactly.
- Migration 0005 adds prefix_length (default 0 = stored whole).
Per-model-call usage recording:
- New modelUsage fact log on the turn: one entry per model call, committed
in the same write as the assistant message it paid for. ModelAdapter
results now carry {message, usage}; VercelModelAdapter treats usage
reporting failures as null rather than failing a completed step.
- totalUsage() derives turn aggregates; null means never reported.
- Migration 0004 adds the model_usage column.
EventStream: replay removed, bus-style live delivery:
- Events go to consumers attached at push time and are dropped otherwise,
matching the runtime's IBus philosophy (facts persisted, deltas cosmetic,
renderer reconciles from snapshots). No buffering without consumers;
per-iterator queues bounded by consumer lag. Iterators attach
synchronously at creation so the loop's own for-await never misses events.
Also: dispatched-call closures get honest wording ("may have completed
externally") distinct from interrupted and never-ran; SqliteTurnStore.update
keeps the no-op write guard alongside the prefix_length read.
8 new tests (87 total).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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