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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/compact/compact/README.md
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@@ -12,12 +12,6 @@ This package is the interface tier of the compaction capability, split so each c
Unlike the bash seam, this interface depends on `@deepseek-ai/dsh-session` and `@deepseek-ai/dsh-llm` — the contract's verbs are defined over a `Session` and its output is the `ContentBlock` vocabulary, so they cannot be expressed without naming those packages. That deviation from the "interface depends only on cordis" guidance is intentional and recorded in the [compaction capability-seam RFC](../../../docs/rfc/implemented/feature/2026-06-18-compaction-capability-seam.md).
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| Conversation history, when a backend is invoked | A successful implementation replaces an older surface range with one user-role summary checkpoint; the raw events stay logged but stop appearing in derived model messages. The seam itself performs no rewrite. | Zero direct tokens from this interface. A backend trades many retained history tokens for one summary and leaves the recent tail unchanged. |
## Service API (`ctx.compact`)
Both methods are **abstract** — the backend owns the entire strategy (token estimation, retention policy, event sequencing, summarization).
@@ -55,6 +49,12 @@ The `compact/*` events extend `SessionEventMap` (merge-extensible) via declarati
Subclass `CompactService`, implement `compactIfNeeded` and `compactRegion`, and load the subclass as a plugin — it registers as `ctx.compact`. A tokenizer-, template-, or model-backed implementation can live as a sibling package without changing callers.
## Model Experience
| Context surface | What the model sees | Token effect |
|---|---|---|
| Conversation history, when a backend is invoked | A successful implementation replaces an older surface range with one user-role summary checkpoint; the raw events stay logged but stop appearing in derived model messages. The seam itself performs no rewrite. | Zero direct tokens from this interface. A backend trades many retained history tokens for one summary and leaves the recent tail unchanged. |
## Known Limitations and Deferred Work
- **No model-facing consumer tier yet** — `@deepseek-ai/dsh-tool-compact` (the `/compact` tool) is deferred; compaction is reachable only via direct `ctx.compact` calls or a backend's auto listener.