diff --git a/packages/opencode/src/session/compaction.ts b/packages/opencode/src/session/compaction.ts
index 7e6b81317b..1729f475d2 100644
--- a/packages/opencode/src/session/compaction.ts
+++ b/packages/opencode/src/session/compaction.ts
@@ -45,7 +45,6 @@ export namespace SessionCompaction {
       parentID: MessageID
       messages: MessageV2.WithParts[]
       sessionID: SessionID
-      abort: AbortSignal
       auto: boolean
       overflow?: boolean
     }) => Effect.Effect<"continue" | "stop">
@@ -135,7 +134,6 @@ export namespace SessionCompaction {
         parentID: MessageID
         messages: MessageV2.WithParts[]
         sessionID: SessionID
-        abort: AbortSignal
         auto: boolean
         overflow?: boolean
       }) {
@@ -236,13 +234,6 @@ When constructing the summary, try to stick to this template:
           sessionID: input.sessionID,
           model,
         })
-        const cancel = Effect.fn("SessionCompaction.cancel")(function* () {
-          if (!input.abort.aborted || msg.time.completed) return
-          msg.error = msg.error ?? new MessageV2.AbortedError({ message: "Aborted" }).toObject()
-          msg.finish = msg.finish ?? "error"
-          msg.time.completed = Date.now()
-          yield* session.updateMessage(msg)
-        })
         const result = yield* processor
           .process({
             user: userMessage,
@@ -259,7 +250,7 @@ When constructing the summary, try to stick to this template:
             ],
             model,
           })
-          .pipe(Effect.ensuring(cancel()))
+          .pipe(Effect.onInterrupt(() => processor.abort()))
 
         if (result === "compact") {
           processor.message.error = new MessageV2.ContextOverflowError({
@@ -383,7 +374,7 @@ When constructing the summary, try to stick to this template:
     ),
   )
 
-  const { runPromise, runPromiseExit } = makeRuntime(Service, defaultLayer)
+  const { runPromise } = makeRuntime(Service, defaultLayer)
 
   export async function isOverflow(input: { tokens: MessageV2.Assistant["tokens"]; model: Provider.Model }) {
     return runPromise((svc) => svc.isOverflow(input))
@@ -393,21 +384,16 @@ When constructing the summary, try to stick to this template:
     return runPromise((svc) => svc.prune(input))
   }
 
-  export async function process(input: {
-    parentID: MessageID
-    messages: MessageV2.WithParts[]
-    sessionID: SessionID
-    abort: AbortSignal
-    auto: boolean
-    overflow?: boolean
-  }) {
-    const exit = await runPromiseExit((svc) => svc.process(input), { signal: input.abort })
-    if (Exit.isFailure(exit)) {
-      if (Cause.hasInterrupts(exit.cause) && input.abort.aborted) return "stop"
-      throw Cause.squash(exit.cause)
-    }
-    return exit.value
-  }
+  export const process = fn(
+    z.object({
+      parentID: MessageID.zod,
+      messages: z.custom<MessageV2.WithParts[]>(),
+      sessionID: SessionID.zod,
+      auto: z.boolean(),
+      overflow: z.boolean().optional(),
+    }),
+    (input) => runPromise((svc) => svc.process(input)),
+  )
 
   export const create = fn(
     z.object({
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index a54f8f7471..6916ddced6 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -657,16 +657,13 @@ export namespace SessionPrompt {
           }
 
           if (task?.type === "compaction") {
-            const result = yield* Effect.promise((signal) =>
-              SessionCompaction.process({
-                messages: msgs,
-                parentID: lastUser!.id,
-                abort: signal,
-                sessionID,
-                auto: task.auto,
-                overflow: task.overflow,
-              }),
-            )
+            const result = yield* compaction.process({
+              messages: msgs,
+              parentID: lastUser!.id,
+              sessionID,
+              auto: task.auto,
+              overflow: task.overflow,
+            })
             if (result === "stop") break
             continue
           }
diff --git a/packages/opencode/test/session/compaction.test.ts b/packages/opencode/test/session/compaction.test.ts
index 4795823513..637cf8e67f 100644
--- a/packages/opencode/test/session/compaction.test.ts
+++ b/packages/opencode/test/session/compaction.test.ts
@@ -540,7 +540,6 @@ describe("session.compaction.process", () => {
                 parentID: msg.id,
                 messages: msgs,
                 sessionID: session.id,
-                abort: new AbortController().signal,
                 auto: false,
               }),
             ),
@@ -580,7 +579,6 @@ describe("session.compaction.process", () => {
                 parentID: msg.id,
                 messages: msgs,
                 sessionID: session.id,
-                abort: new AbortController().signal,
                 auto: false,
               }),
             ),
@@ -621,7 +619,6 @@ describe("session.compaction.process", () => {
                 parentID: msg.id,
                 messages: msgs,
                 sessionID: session.id,
-                abort: new AbortController().signal,
                 auto: true,
               }),
             ),
@@ -675,7 +672,6 @@ describe("session.compaction.process", () => {
                 parentID: msg.id,
                 messages: msgs,
                 sessionID: session.id,
-                abort: new AbortController().signal,
                 auto: true,
                 overflow: true,
               }),
@@ -717,7 +713,6 @@ describe("session.compaction.process", () => {
                 parentID: msg.id,
                 messages: msgs,
                 sessionID: session.id,
-                abort: new AbortController().signal,
                 auto: true,
                 overflow: true,
               }),
@@ -792,7 +787,6 @@ describe("session.compaction.process", () => {
                   parentID: msg.id,
                   messages: msgs,
                   sessionID: session.id,
-                  abort: abort.signal,
                   auto: false,
                 }),
               ),
@@ -858,7 +852,6 @@ describe("session.compaction.process", () => {
                   parentID: msg.id,
                   messages: msgs,
                   sessionID: session.id,
-                  abort: abort.signal,
                   auto: false,
                 }),
               ),