diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index 22b1d7d99a2..0f85d44f209 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -1110,7 +1110,7 @@ const layer = Layer.effect(
 
           if (
             lastAssistant?.finish &&
-            !["tool-calls"].includes(lastAssistant.finish) &&
+            !["tool-calls", "unknown"].includes(lastAssistant.finish) &&
             !hasToolCalls &&
             lastAssistant.parentID === lastUser.id
           ) {
diff --git a/packages/opencode/test/session/prompt.test.ts b/packages/opencode/test/session/prompt.test.ts
index 5a0176abc9b..da6e0f8d036 100644
--- a/packages/opencode/test/session/prompt.test.ts
+++ b/packages/opencode/test/session/prompt.test.ts
@@ -850,6 +850,34 @@ it.instance("loop continues when finish is tool-calls", () =>
   }),
 )
 
+it.instance("loop continues when finish is unknown", () =>
+  Effect.gen(function* () {
+    const { llm } = yield* useServerConfig(providerCfg)
+    const prompt = yield* SessionPrompt.Service
+    const sessions = yield* Session.Service
+    const session = yield* sessions.create({
+      title: "Pinned",
+      permission: [{ permission: "*", pattern: "*", action: "allow" }],
+    })
+    yield* prompt.prompt({
+      sessionID: session.id,
+      agent: "build",
+      noReply: true,
+      parts: [{ type: "text", text: "hello" }],
+    })
+    yield* llm.push(reply())
+    yield* llm.text("second")
+
+    const result = yield* prompt.loop({ sessionID: session.id })
+    expect(yield* llm.calls).toBe(2)
+    expect(result.info.role).toBe("assistant")
+    if (result.info.role === "assistant") {
+      expect(result.parts.some((part) => part.type === "text" && part.text === "second")).toBe(true)
+      expect(result.info.finish).toBe("stop")
+    }
+  }),
+)
+
 it.instance("glob tool keeps instance context during prompt runs", () =>
   Effect.gen(function* () {
     const { dir, llm } = yield* useServerConfig(providerCfg)