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feat(llm): add replay token metering (PR2 round 1)

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Hypatia May
2026-07-15 14:47:29 +08:00
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packages/compact/compact/README.md
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@@ -7,14 +7,14 @@ This package is the interface tier of the compaction capability, split so each c
| Package | Role |
|---|---|
| `@deepseek-ai/dsh-compact` (this) | the interface: abstract service + `compact/*` events + `CompactionResult` + tool-pairing boundary helpers + the shared transcript renderer (`renderTranscript`/`renderContentBlocks`) |
| `@deepseek-ai/dsh-compact-basic` | a backend: chars-per-token estimation (`charsPerToken`, default 4) + token-budget retention + `llm.stream()` summarization |
| `@deepseek-ai/dsh-compact-basic` | a backend: `ctx.tokenMeter` pressure + token-budget retention + `llm.stream()` summarization |
| `@deepseek-ai/dsh-tool-compact` (deferred) | the model-facing `/compact` tool over `ctx.compact` |
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).
## Service API (`ctx.compact`)
Both methods are **abstract** — the backend owns the entire strategy (token estimation, retention policy, event sequencing, summarization).
Both methods are **abstract** — the backend owns trigger policy, retention, event sequencing, and summarization. Reusable request measurement is a separate service, [`ctx.tokenMeter`](../../llm/token-meter/README.md), rather than part of this interface.
| Member | Semantics |
|---|---|
@@ -53,7 +53,7 @@ The `compact/*` events extend `SessionEventMap` (merge-extensible) via declarati
## Implementing a backend
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.
Subclass `CompactService`, implement `compactIfNeeded` and `compactRegion`, and load the subclass as a plugin — it registers as `ctx.compact`. A template- or model-backed implementation can live as a sibling package without changing callers or the shared token meter.
## Model Experience
packages/compact/compact/src/index.ts
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}
/**
* Abstract compaction service. Implementations own token estimation, retention,
* and summarization, but a successful run must replace the selected surface span
* with one summary node and prevent concurrent compaction of the same session.
* Load one implementation per context as `ctx.compact`.
* Abstract compaction service. Implementations own trigger policy, retention,
* and summarization, and may consume a separate measurement service. A
* successful run replaces the selected surface span with one summary node and
* prevents concurrent compaction of the same session. Load one implementation
* per context as `ctx.compact`.
*/
export abstract class CompactService extends Service {
constructor(ctx: Context) {