diff --git a/Storage/experiences/overflow65537/pipeline-override-expected-threshold/index.md b/Storage/experiences/overflow65537/pipeline-override-expected-threshold/index.md
new file mode 100644
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+++ b/Storage/experiences/overflow65537/pipeline-override-expected-threshold/index.md
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+# thresholds.size() != expected.size()：override 改列表长度时的修复
+
+> **适用范围**：不只 NeuralNetworkDetect。凡识别参数里 `threshold` 会与某个列表字段等长扩展、逐项对应的，override 时改列表长度都可能踩坑。TemplateMatch（`template`）、OCR 等也有同类风险。
+
+## 报错现象
+
+任务启动时 `post_task` 失败，`override_pipeline` 阶段解析节点报错：
+
+``` log
+[ERR] PipelineParser.cpp parse_nn_detector_param
+      thresholds.size() != expected.size()
+      [output.thresholds.size()=13] [output.expected.size()=1]
+
+[ERR] PipelineParser.cpp parse_node
+      failed to parse_recognition [input={"expected":[15]}]
+
+[ERR] Context.cpp override_pipeline_once
+      parse_task failed [key=NNDetect-选项-优先级_2] [value={"expected":[15]}]
+
+[ERR] Tasker.cpp post_task
+      failed to override_pipeline [task_ptr->entry()=任务入口节点]
+```
+
+**直接原因**：override 只写了 `{"expected":[15]}`，列表被替换成 1 个元素，但 `threshold` 仍继承原节点的 13 个元素，长度校验失败。
+
+**触发 override**（节选）：
+
+```json
+"pipeline_override": {
+    "NNDetect-选项-优先级_1": { "expected": [19] },
+    "NNDetect-选项-优先级_2": { "expected": [15] }
+}
+```
+
+---
+
+## 原因：override 的替换与继承规则
+
+`pipeline_override` 对字段是**整段替换**，未写明的字段**继承原节点**。原节点加载时框架已把标量 `threshold` 扩展成与列表等长的数组；override 只改写了列表，继承下来的 `threshold` 不会自动跟着变。
+
+### **原节点（正常）**
+
+```json
+"NNDetect-选项-优先级_2": {
+    "recognition": {
+        "type": "NeuralNetworkDetect",
+        "param": {
+            "model": "best.onnx",
+            "expected": [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
+        }
+    }
+}
+```
+
+| 字段 | 实际值 |
+|------|--------|
+| `expected` | 13 个 |
+| `threshold` | 13 个（由默认 `0.3` 自动扩展） |
+
+### **override 只改 expected**
+
+```json
+"NNDetect-选项-优先级_2": { "expected": [15] }
+```
+
+| 字段 | override 后的值 |
+|------|----------------|
+| `expected` | `[15]` → **1 个**（整段替换） |
+| `threshold` | 13 个 → **继承，未变** |
+
+→ `thresholds.size() != expected.size()`，解析失败。
+
+---
+
+## 推荐做法
+
+### 方案一（优先）：interface 只改目标，不改数量
+
+前端 / interface 通过 `pipeline_override` 定制节点时，只替换要用的那一项，**保持列表长度与原节点一致**（如 `expected`、`template` 等），继承的 `threshold` 仍能对上。
+
+### 方案二：确实要改变列表长度时，手动带上 threshold
+
+override 里**显式写出**与新列表等长的 `threshold`（标量即可，框架会重新扩展）：
+
+```json
+"NNDetect-选项-优先级_2": {
+    "expected": [15],
+    "threshold": 0.3
+}
+```
+
+若原节点用了非默认阈值，应写相同标量，或写齐与新列表等长的 threshold 数组。批量 override 时，每一个改了列表长度却没写 `threshold` 的节点都要补全。
diff --git a/Storage/experiences/overflow65537/pipeline-override-expected-threshold/maahub_meta.json b/Storage/experiences/overflow65537/pipeline-override-expected-threshold/maahub_meta.json
new file mode 100644
index 0000000..19f01ba
--- /dev/null
+++ b/Storage/experiences/overflow65537/pipeline-override-expected-threshold/maahub_meta.json
@@ -0,0 +1,23 @@
+{
+  "id": "overflow65537/pipeline-override-expected-threshold",
+  "title": "thresholds.size() != expected.size()：override 改列表长度时的修复",
+  "description": "pipeline_override 改变 expected、template 等列表长度时，threshold 仍继承原节点导致校验失败；适用于 NeuralNetworkDetect、TemplateMatch、OCR 等带 threshold 的识别。",
+  "author": "overflow65537",
+  "source": "MaaHub",
+  "sourceGithub": "https://github.com/MaaXYZ/MaaHub",
+  "tags": ["pipeline", "pipeline_override", "threshold", "pitfall", "troubleshooting"],
+  "createdAt": "2026-06-28",
+  "updatedAt": "2026-06-28",
+  "version": "0.3.0",
+  "mfwVersion": "5.10.4",
+  "entry": "index.md",
+  "readme": "./index.md",
+  "chapters": [
+    { "title": "报错排查与修复", "path": "index.md" }
+  ],
+  "status": "stable",
+  "type": "experience",
+  "category": "pipeline",
+  "difficulty": "beginner",
+  "estimatedTime": "5min"
+}