docs: 沉淀 Action 表单 visibleWhen 条件显隐契约

assets/examples/README.md

@@ -5,3 +5,4 @@
 - `skill-cell-presentation.example.json`：数据管理单元格呈现文档形状参考（见 `references/CELL_PRESENTATION.md`）。
 - `render-html.action.example.json`：HTML 报告「重新生成」Action 形状参考（固定 id `render-html`；见 `references/ACTIONS.md`）。
 - `lookup-action.example.json`：Action 内联 Lookup 下拉形状参考（跨表引用勿填编号；见 `references/ACTIONS.md`「跨表引用：Lookup」）。
+- `visible-when-action.example.json`：Action 参数字段条件显隐 `visibleWhen` 形状参考（互斥模式联动；见 `references/ACTIONS.md`「字段条件显隐」；≠ Policy L3）。

assets/examples/visible-when-action.example.json

@@ -0,0 +1,72 @@
+{
+  "_comment": "形状参考：互斥模式用 inputSchema.properties.*.visibleWhen 联动显隐，勿只靠 description 灰字。完整契约见 references/ACTIONS.md「字段条件显隐」。勿与 POLICY.md L3 行态 visibleWhen 混淆。",
+  "schemaVersion": 1,
+  "skill": "your-skill-slug",
+  "actions": [
+    {
+      "id": "scrape-links-demo",
+      "label": "采集链接（示例）",
+      "description": "演示按采集方式切换参数：关键词路径 vs 作者主页路径。",
+      "placements": ["toolbar"],
+      "executionProfile": "async",
+      "interaction": "form",
+      "bind": {
+        "tables": ["demo_items"]
+      },
+      "confirmation": {
+        "message": "将按所选方式采集链接（示例确认文案）。是否继续？"
+      },
+      "entrypoint": {
+        "type": "cli",
+        "command": "run",
+        "args": [
+          "--collect-mode",
+          "{{collectMode}}",
+          "--keyword",
+          "{{keyword}}",
+          "--author-url",
+          "{{authorUrl}}",
+          "--max-count",
+          "{{maxCount}}"
+        ]
+      },
+      "inputSchema": {
+        "type": "object",
+        "required": ["collectMode"],
+        "properties": {
+          "collectMode": {
+            "type": "string",
+            "title": "采集方式",
+            "description": "先选方式，下方只出现对应参数。",
+            "enum": ["按关键词采集", "按作者主页采集"],
+            "default": "按关键词采集"
+          },
+          "keyword": {
+            "type": "string",
+            "title": "关键词",
+            "description": "例如 rpa。",
+            "visibleWhen": {
+              "field": "collectMode",
+              "equals": "按关键词采集"
+            }
+          },
+          "authorUrl": {
+            "type": "string",
+            "title": "作者主页链接",
+            "description": "例如 https://example.com/author/...",
+            "display_type": "url",
+            "visibleWhen": {
+              "collectMode": "按作者主页采集"
+            }
+          },
+          "maxCount": {
+            "type": "number",
+            "title": "数量上限",
+            "default": 50,
+            "minimum": 1
+          }
+        }
+      }
+    }
+  ]
+}