diff --git a/android/app/src/main/java/cn/ilapage/goauto/agent/automation/RuleContract.kt b/android/app/src/main/java/cn/ilapage/goauto/agent/automation/RuleContract.kt
index 208f58c..c5898ba 100644
--- a/android/app/src/main/java/cn/ilapage/goauto/agent/automation/RuleContract.kt
+++ b/android/app/src/main/java/cn/ilapage/goauto/agent/automation/RuleContract.kt
@@ -150,11 +150,22 @@ object AgentCapabilities {
     const val PDD_PRODUCT_DETAIL_V1 = "collector.pdd.product-detail.v1"
     const val PDD_CURRENT_PAGE_SHARE_V1 = "collector.pdd.current-page-share.v1"
 
+    /**
+     * 图搜采集能力（#277）。
+     *
+     * `[必须]` 必须与服务端 `task.ImageSearchCapability` 逐字一致。
+     * `taskCompatible` 对 source='image_search' 的任务按该能力过滤：
+     * 设备不声明则图搜任务**永远不会被领取**，且是静默的——
+     * 任务停在 pending、不失败也不报错。
+     */
+    const val PDD_IMAGE_SEARCH_V1 = "pdd.image-search.v1"
+
     val supported: List<String> = listOf(
         SCHEMA_V2,
         SWIPE_V1,
         PDD_PRODUCT_DETAIL_V1,
         PDD_CURRENT_PAGE_SHARE_V1,
+        PDD_IMAGE_SEARCH_V1,
         PurchaseAgentCapabilities.REHEARSAL_V1,
         PurchaseAgentCapabilities.LIVE_V1,
         PurchaseAgentCapabilities.SPEC_PROBE_V1,
diff --git a/android/app/src/test/java/cn/ilapage/goauto/agent/AgentCapabilitiesTest.kt b/android/app/src/test/java/cn/ilapage/goauto/agent/AgentCapabilitiesTest.kt
new file mode 100644
index 0000000..dd8cce2
--- /dev/null
+++ b/android/app/src/test/java/cn/ilapage/goauto/agent/AgentCapabilitiesTest.kt
@@ -0,0 +1,27 @@
+package cn.ilapage.goauto.agent
+
+import cn.ilapage.goauto.agent.automation.AgentCapabilities
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class AgentCapabilitiesTest {
+
+    // #277: 服务端 taskCompatible 对 source='image_search' 的任务按这个能力过滤。
+    // 漏声明时图搜任务永远不会被领取，而且是静默的：任务停在 pending、
+    // 不失败也不报错。字符串必须与 task.ImageSearchCapability 逐字一致。
+    @Test
+    fun `supported capabilities include the image search capability the server gates on`() {
+        assertTrue(
+            "AgentCapabilities.supported 缺少 pdd.image-search.v1，图搜任务将无法被领取",
+            AgentCapabilities.supported.contains("pdd.image-search.v1"),
+        )
+    }
+
+    @Test
+    fun `supported capabilities have no duplicates`() {
+        assertTrue(
+            "能力清单出现重复项: " + AgentCapabilities.supported,
+            AgentCapabilities.supported.size == AgentCapabilities.supported.toSet().size,
+        )
+    }
+}