diff --git a/packages/opencode/src/session/processor.ts b/packages/opencode/src/session/processor.ts
index ada6f8314..24b4a4f9f 100644
--- a/packages/opencode/src/session/processor.ts
+++ b/packages/opencode/src/session/processor.ts
@@ -368,6 +368,7 @@ export namespace SessionProcessor {
               sessionID: input.assistantMessage.sessionID,
               error: input.assistantMessage.error,
             })
+            SessionStatus.set(input.sessionID, { type: "idle" })
           }
           if (snapshot) {
             const patch = await Snapshot.patch(snapshot)
diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index c6d040f2f..98dce97ba 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -62,7 +62,7 @@ export namespace SessionPrompt {
           abort: AbortController
           callbacks: {
             resolve(input: MessageV2.WithParts): void
-            reject(): void
+            reject(reason?: any): void
           }[]
         }
       > = {}
@@ -72,7 +72,7 @@ export namespace SessionPrompt {
       for (const item of Object.values(current)) {
         item.abort.abort()
         for (const callback of item.callbacks) {
-          callback.reject()
+          callback.reject(new DOMException("Aborted", "AbortError"))
         }
       }
     },
@@ -251,10 +251,13 @@ export namespace SessionPrompt {
     log.info("cancel", { sessionID })
     const s = state()
     const match = s[sessionID]
-    if (!match) return
+    if (!match) {
+      SessionStatus.set(sessionID, { type: "idle" })
+      return
+    }
     match.abort.abort()
     for (const item of match.callbacks) {
-      item.reject()
+      item.reject(new DOMException("Aborted", "AbortError"))
     }
     delete s[sessionID]
     SessionStatus.set(sessionID, { type: "idle" })