From 432e038e3ccfedd503480df6f0e499c47985c8b5 Mon Sep 17 00:00:00 2001
From: yu <191972707@qq.com>
Date: Wed, 28 Oct 2026 13:08:53 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20=E4=BF=AE=E6=AD=A3=E9=81=8D=E5=8E=86?=
 =?UTF-8?q?=E5=88=97=E8=A1=A8=E8=B4=9F=E6=95=B0=E7=BB=93=E6=9D=9F=E7=B4=A2?=
 =?UTF-8?q?=E5=BC=95?=
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---
 src/main/engine/runtime.integration.test.ts | 22 +++++++++++++++++++++
 src/main/engine/runtime.ts                  |  3 ++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/main/engine/runtime.integration.test.ts b/src/main/engine/runtime.integration.test.ts
index 3db97aa..3768d11 100644
--- a/src/main/engine/runtime.integration.test.ts
+++ b/src/main/engine/runtime.integration.test.ts
@@ -197,6 +197,28 @@ describe("runFlow integration", () => {
     expect(events.filter((event) => event.type === "node.started" && event.nodeId === "accumulate")).toHaveLength(3);
   });
 
+  it("runs an array loop through the last item when end_index is -1", async () => {
+    const loop = node("loop", "logic_control_array_for_v3", {
+      array_name: "items",
+      reverse: false,
+      start_index: 0,
+      end_index: -1
+    });
+    const definition = flow("array-loop-flow", [
+      loop,
+      node("collect", "Basic_DebugOutput", { msg: "${item}" }, {}, {
+        parentId: loop.id,
+        slot: "array_for_fn"
+      })
+    ]);
+
+    const { result, events } = await execute(definition, { items: ["glm", "mini", "other", "kimi"] });
+
+    expect(result.status).toBe("succeeded");
+    expect(result.nodes.find((state) => state.nodeId === "loop")?.output).toBe(4);
+    expect(events.filter((event) => event.type === "node.started" && event.nodeId === "collect").map((event) => event.nodeId)).toHaveLength(4);
+  });
+
   it("retries a transient failure and records the successful attempt", async () => {
     const component = testComponent("Test.TransientFailure");
     let calls = 0;
diff --git a/src/main/engine/runtime.ts b/src/main/engine/runtime.ts
index 9b7a7c4..d3e8edd 100644
--- a/src/main/engine/runtime.ts
+++ b/src/main/engine/runtime.ts
@@ -409,7 +409,8 @@ async function executeContainer(
       const list = asArray(value);
       const reverse = String(node.values?.reverse ?? "") === "true" || String(node.values?.reverse ?? "") === "1";
       const start = Math.max(0, toNumber(node.values?.start_index, 0));
-      const end = node.values?.end_index === "" || node.values?.end_index == null ? list.length : toNumber(node.values?.end_index, list.length);
+      const requestedEnd = node.values?.end_index === "" || node.values?.end_index == null ? list.length : toNumber(node.values?.end_index, list.length);
+      const end = requestedEnd < 0 ? Math.max(start, list.length + requestedEnd + 1) : requestedEnd;
       const slice = (reverse ? [...list].reverse() : list).slice(start, end);
       let iterations = 0;
       for (let index = 0; index < slice.length; index += 1) {