diff --git a/docs/core-data-structures/compaction.md b/docs/core-data-structures/compaction.md
index 75900bc5db..9bdb987f81 100644
--- a/docs/core-data-structures/compaction.md
+++ b/docs/core-data-structures/compaction.md
@@ -11,7 +11,7 @@ Compaction extends [`SessionEventMap`](session.md) with three event types via de
 | Event | Payload | Role |
 |---|---|---|
 | `compact/start` | `{ turn }` | acquires the log-recorded lock |
-| `compact/summary` | `{ summary, compactedRange, compactedEventSeqs, tokenCount }` | provenance: the summary blocks, the shadowed seq range, and the estimated token count |
+| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount }` | provenance: the summary blocks, the shadowed seq range, and the estimated token count |
 | `compact/end` | `{ turn, error? }` | releases the lock (`error` set when summarization threw) |
 
 The lock brackets the **whole** operation: `compact/start` is appended first, then summarization, the `compact/summary` provenance record, and the `user/message` replacement all land, and only then `compact/end`. Releasing the lock last turns a crash mid-operation into a detectable orphaned lock (a `compact/start` with no matching `compact/end`) rather than a `compact/end` that falsely claims compaction finished.
@@ -37,7 +37,7 @@ interface CompactionResult {
   /** The seq numbers of all shadowed surface nodes. */
   shadowedSeqs: number[]
   /** Estimated token count of the shadowed content. */
-  compactedTokenCount: number
+  shadowedTokenCount: number
 }
 ```
 
diff --git a/docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md b/docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md
index 1ddcd05b42..2d559fa65c 100644
--- a/docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md
+++ b/docs/rfc/proposed/feature/2026-06-18-compaction-capability-seam.md
@@ -22,7 +22,7 @@ Per the [capability-seams RFC](../../implemented/architecture/2026-06-13-capabil
 
 ### The contract depends on `dsh-session` and `dsh-llm` — a deliberate deviation
 
-The capability-seams RFC states the interface package "depends only on cordis" (true of `dsh-bash`, whose vocabulary is self-contained). Compaction **cannot** honor that: its verbs are defined *over* a `Session` (`compactRegion(session, start, end)`) and its output *is* the content vocabulary (`CompactionResult.summary: ContentBlock[]`). There is no way to express the contract without naming `Session`/`SessionEvent` (from `dsh-session`) and `ContentBlock` (from `dsh-llm`). 
+The capability-seams RFC states the interface package "depends only on cordis" (true of `dsh-bash`, whose vocabulary is self-contained). Compaction **cannot** honor that: its verbs are defined *over* a `Session` (`compactRegion(session, start, end)`) and its output *is* the content vocabulary (`CompactionResult.summary: ContentBlock[]`). There is no way to express the contract without naming `Session`/`SessionEvent` (from `dsh-session`) and `ContentBlock` (from `dsh-llm`).
 
 This is not a coupling smell — it is the contract's domain. The "only cordis" guidance was always shorthand for "the interface depends only on what the contract genuinely names, and never on an implementation." `dsh-session` and `dsh-llm` are themselves interface/vocabulary packages, not implementations; `dsh-compact` still imports no backend. The seam's real invariant — *consumers and implementations evolve independently behind an abstract service* — holds intact. We record the deviation here so a future reader doesn't mistake it for an accident or "fix" it by smuggling `Session` behind an opaque handle.
 
diff --git a/packages/compact/compact/README.md b/packages/compact/compact/README.md
index a6e2176bd8..9ef5b73005 100644
--- a/packages/compact/compact/README.md
+++ b/packages/compact/compact/README.md
@@ -48,7 +48,7 @@ The `compact/*` events extend `SessionEventMap` (merge-extensible) via declarati
 | Event | Payload | On surface? |
 |---|---|---|
 | `compact/start` | `{ turn }` | no (log-only) |
-| `compact/summary` | `{ summary, compactedRange, compactedEventSeqs, tokenCount }` | no (log-only) |
+| `compact/summary` | `{ summary, shadowedRange, shadowedSeqs, shadowedTokenCount }` | no (log-only) |
 | `compact/end` | `{ turn, error? }` | no (log-only) |
 
 ## Implementing a backend
diff --git a/packages/compact/compact/src/types.ts b/packages/compact/compact/src/types.ts
index 08b37ef4c6..36dd5fb629 100644
--- a/packages/compact/compact/src/types.ts
+++ b/packages/compact/compact/src/types.ts
@@ -29,9 +29,9 @@ declare module '@deepseek-ai/dsh-session' {
      */
     'compact/summary': {
       summary: ContentBlock[]
-      compactedRange: { startSeq: number; endSeq: number }
-      compactedEventSeqs: number[]
-      tokenCount: number
+      shadowedRange: { start: number; end: number }
+      shadowedSeqs: number[]
+      shadowedTokenCount: number
     }
     /** Marks the end of a compaction — log-only, releases the lock. `error` set if summarization failed. */
     'compact/end': { turn: number; error?: string }
@@ -53,5 +53,5 @@ export interface CompactionResult {
   /** The seq numbers of all shadowed surface nodes. */
   shadowedSeqs: number[]
   /** Estimated token count of the shadowed content. */
-  compactedTokenCount: number
+  shadowedTokenCount: number
 }
diff --git a/packages/compact/compact/tests/compact.spec.ts b/packages/compact/compact/tests/compact.spec.ts
index 4a758f4364..b3ad9d1501 100644
--- a/packages/compact/compact/tests/compact.spec.ts
+++ b/packages/compact/compact/tests/compact.spec.ts
@@ -36,9 +36,9 @@ class StubCompactService extends CompactService {
     const startEvent = session.append('compact/start', { turn: 0 })
     const summaryEvent = session.append('compact/summary', {
       summary: [{ type: 'text', text: 'stub' }],
-      compactedRange: { startSeq: start, endSeq: end },
-      compactedEventSeqs: [],
-      tokenCount: 0,
+      shadowedRange: { start, end },
+      shadowedSeqs: [],
+      shadowedTokenCount: 0,
     })
     const endEvent = session.append('compact/end', { turn: 0 })
     return {
@@ -48,7 +48,7 @@ class StubCompactService extends CompactService {
       summary: [{ type: 'text', text: 'stub' }],
       shadowedRange: { start, end },
       shadowedSeqs: [],
-      compactedTokenCount: 0,
+      shadowedTokenCount: 0,
     }
   }
 }