diff --git a/packages/opencode/src/session/compaction.ts b/packages/opencode/src/session/compaction.ts
index a0f1c55c4..79884d641 100644
--- a/packages/opencode/src/session/compaction.ts
+++ b/packages/opencode/src/session/compaction.ts
@@ -120,9 +120,8 @@ export namespace SessionCompaction {
           break
         }
       }
-      const hasContent = replay && messages.some(
-        (m) => m.info.role === "user" && !m.parts.some((p) => p.type === "compaction"),
-      )
+      const hasContent =
+        replay && messages.some((m) => m.info.role === "user" && !m.parts.some((p) => p.type === "compaction"))
       if (!hasContent) {
         replay = undefined
         messages = input.messages
@@ -273,7 +272,8 @@ When constructing the summary, try to stick to this template:
         const text =
           (input.overflow
             ? "The previous request exceeded the provider's size limit due to large media attachments. The conversation was compacted and media files were removed from context. If the user was asking about attached images or files, explain that the attachments were too large to process and suggest they try again with smaller or fewer files.\n\n"
-            : "") + "Continue if you have next steps, or stop and ask for clarification if you are unsure how to proceed."
+            : "") +
+          "Continue if you have next steps, or stop and ask for clarification if you are unsure how to proceed."
         await Session.updatePart({
           id: Identifier.ascending("part"),
           messageID: continueMsg.id,
diff --git a/packages/sdk/js/src/v2/gen/types.gen.ts b/packages/sdk/js/src/v2/gen/types.gen.ts
index 669883590..69d105610 100644
--- a/packages/sdk/js/src/v2/gen/types.gen.ts
+++ b/packages/sdk/js/src/v2/gen/types.gen.ts
@@ -505,6 +505,7 @@ export type CompactionPart = {
   messageID: string
   type: "compaction"
   auto: boolean
+  overflow?: boolean
 }
 
 export type Part =
diff --git a/packages/sdk/openapi.json b/packages/sdk/openapi.json
index 8e88b0969..8f03cb92c 100644
--- a/packages/sdk/openapi.json
+++ b/packages/sdk/openapi.json
@@ -8290,6 +8290,9 @@
           },
           "auto": {
             "type": "boolean"
+          },
+          "overflow": {
+            "type": "boolean"
           }
         },
         "required": ["id", "sessionID", "messageID", "type", "auto"]