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docs: address model experience review

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Tianyi Cui
2026-07-12 02:55:26 +08:00
parent a08485fc80
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packages/session-persistence/session-persistence-jsonl/README.md
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The JSONL durable session-persistence backend — a concrete `SessionPersistence` (the `dsh-session-persistence` seam). One append-only `.jsonl` event log per session.
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| Resumed conversation history | JSONL storage contributes no live prompt or schema. Loading restores stored surface history and preserves prior request headers for reconstruction; the new loop composes its current envelope. An interrupted tail is balanced with error tool results. Raw `assistant/chunk` records do not duplicate messages. | Zero live-request tokens. A resumed agent pays for retained history and its current envelope, plus small repair results only after an interrupted tool turn. |
## On-disk layout
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The plugin generalizes the example `session-jsonl.ts`: it subscribes to `session/created` (capture the header; persist a fork's seed once), `session/event` (snapshot each event when buffering — the live `session.events` object is mutable), and `session/flush`/dispose (drain the write-behind buffer through `append`). A per-session write cursor means a resumed session never re-appends already-stored events. Existing live sessions are seeded on plugin apply (HMR does not replay `session/created`). All backend operations for one session are serialized, and disposal awaits quiescence (every init + final drain) before returning, so no write lands after teardown.
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| Resumed conversation history | JSONL storage contributes no live prompt or schema. Loading restores stored surface history and preserves prior request headers for reconstruction; the new loop composes its current envelope. An interrupted tail is balanced with error tool results. Raw `assistant/chunk` records do not duplicate messages. | Zero live-request tokens. A resumed agent pays for retained history and its current envelope, plus small repair results only after an interrupted tool turn. |
## Known Limitations and Deferred Work
- **Only the current `SESSION_FORMAT_VERSION` (v0) loads** — the on-disk format is pre-release/unstable: a breaking format change is absorbed at v0 and non-current logs are rejected; there is no migration.