diff --git a/android/app/build.gradle.kts b/android/app/build.gradle.kts
index 6c38e4c..6d09516 100644
--- a/android/app/build.gradle.kts
+++ b/android/app/build.gradle.kts
@@ -11,8 +11,8 @@ android {
         applicationId = "cn.ilapage.goauto.agent"
         minSdk = 23
         targetSdk = 34
-        versionCode = 24
-        versionName = "0.9.11"
+        versionCode = 25
+        versionName = "0.9.12"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
 
diff --git a/android/app/src/main/java/cn/ilapage/goauto/agent/automation/PddProductDetailCollector.kt b/android/app/src/main/java/cn/ilapage/goauto/agent/automation/PddProductDetailCollector.kt
index 7b25178..63a510b 100644
--- a/android/app/src/main/java/cn/ilapage/goauto/agent/automation/PddProductDetailCollector.kt
+++ b/android/app/src/main/java/cn/ilapage/goauto/agent/automation/PddProductDetailCollector.kt
@@ -881,12 +881,53 @@ class PddProductDetailCollector(
         missing: MutableSet<String>,
         unsupported: MutableSet<String>,
     ): PddCollectorResult? {
+        val diagnosticStartedAt = now()
+        val diagnosticRowValues = linkedMapOf<Int, MutableSet<String>>()
+        val diagnosticParsedValues = linkedSetOf<String>()
+        var diagnosticNonClickableCandidates = 0
+        var diagnosticSelectedValues = 0
+        var diagnosticHorizontalSwipes = 0
+        var diagnosticTermination = AgentDiagnosticReason.COLOR_FOUND
+
+        fun observeColorDiscovery(screen: ParsedPddScreen, rows: List<List<VisibleSpecValue>>) {
+            rows.forEachIndexed { index, row ->
+                diagnosticRowValues.getOrPut(index) { linkedSetOf() }.addAll(row.map(VisibleSpecValue::text))
+            }
+            val values = rows.flatten()
+            diagnosticParsedValues += values.map(VisibleSpecValue::text)
+            diagnosticSelectedValues = maxOf(
+                diagnosticSelectedValues,
+                values.count { it.node.selected || it.node.checked },
+            )
+            diagnosticNonClickableCandidates = maxOf(
+                diagnosticNonClickableCandidates,
+                visibleNonClickableColorCandidateCount(screen, config, values.map(VisibleSpecValue::text).toSet()),
+            )
+        }
+
+        fun finishColorDiscovery(reason: AgentDiagnosticReason = diagnosticTermination) {
+            recordColorDiscovery(
+                reason = reason,
+                rowValueCounts = diagnosticRowValues.mapValues { it.value.size },
+                parsedValueCount = diagnosticParsedValues.size,
+                nonClickableCandidateCount = diagnosticNonClickableCandidates,
+                selectedValueCount = diagnosticSelectedValues,
+                horizontalSwipes = diagnosticHorizontalSwipes,
+                elapsedMs = now() - diagnosticStartedAt,
+            )
+        }
+
         moveSpecPanelToTop(goodsId, config, evidence, deadline, specPanelContainer)?.let { return it }
         moveColorsToStart(goodsId, config, evidence, deadline)?.let { return it }
         val initial = parse(goodsId, config, evidence)
         initial.problem?.let { return failure(it.code, it.message) }
-        val rowCount = colorRows(initial).size
-        if (rowCount == 0) return null
+        val initialRows = colorRows(initial)
+        observeColorDiscovery(initial, initialRows)
+        val rowCount = initialRows.size
+        if (rowCount == 0) {
+            finishColorDiscovery(AgentDiagnosticReason.COLOR_EDGE_REACHED)
+            return null
+        }
         val attempted = mutableSetOf<String>()
         for (rowIndex in 0 until rowCount) {
             val moveRight = rowIndex % 2 == 0
@@ -902,6 +943,7 @@ class PddProductDetailCollector(
                     if (!screen.pageEvidenceMatched) return failure("RULE_NOT_MATCHED", "采集期间离开 PDD 商品详情页")
                     screen.dimensions.filter { it.key == "unsupported" }.forEach { unsupported += it.name }
                     val rows = colorRows(screen)
+                    observeColorDiscovery(screen, rows)
                     if (rowIndex >= rows.size) {
                         // Some PDD builds remove the selected option from the
                         // clickable accessibility nodes and immediately reflow
@@ -909,6 +951,7 @@ class PddProductDetailCollector(
                         // successful selection is therefore not evidence that
                         // its values were missed. Real gaps are still reported
                         // below as missing colors or prices.
+                        diagnosticTermination = AgentDiagnosticReason.COLOR_ROW_REFLOWED
                         break
                     }
                     currentRow = rows[rowIndex].sortedBy { it.node.bounds.left }
@@ -937,18 +980,101 @@ class PddProductDetailCollector(
                 val signature = optionSignature(currentRow)
                 stable = if (signature == previous) stable + 1 else 0
                 previous = signature
-                if (stable >= config.limits.getValue("stableEdgeReads") || pass == config.limits.getValue("specHorizontalSwipes")) break
-                val anchor = currentRow.firstOrNull()?.node ?: break
+                if (stable >= config.limits.getValue("stableEdgeReads")) {
+                    if (diagnosticTermination == AgentDiagnosticReason.COLOR_FOUND) {
+                        diagnosticTermination = AgentDiagnosticReason.COLOR_EDGE_REACHED
+                    }
+                    break
+                }
+                if (pass == config.limits.getValue("specHorizontalSwipes")) {
+                    if (diagnosticTermination == AgentDiagnosticReason.COLOR_FOUND) {
+                        diagnosticTermination = AgentDiagnosticReason.COLOR_SCAN_LIMIT
+                    }
+                    break
+                }
+                val anchor = currentRow.firstOrNull()?.node
+                if (anchor == null) {
+                    diagnosticTermination = AgentDiagnosticReason.COLOR_CONTAINER_UNAVAILABLE
+                    break
+                }
                 val direction = if (moveRight) SwipeDirection.LEFT else SwipeDirection.RIGHT
-                if (!driver.swipeSpec(direction, anchor)) break
+                if (!driver.swipeSpec(direction, anchor)) {
+                    diagnosticTermination = AgentDiagnosticReason.COLOR_SWIPE_FAILED
+                    break
+                }
+                diagnosticHorizontalSwipes++
                 pause(350)
             }
             val naturalOrder = rowColors.entries.toList().let { if (moveRight) it else it.reversed() }
             naturalOrder.forEach { (text, available) -> colors[text] = colors[text] == true || available }
         }
+        finishColorDiscovery()
         return null
     }
 
+    private fun recordColorDiscovery(
+        reason: AgentDiagnosticReason,
+        rowValueCounts: Map<Int, Int>,
+        parsedValueCount: Int,
+        nonClickableCandidateCount: Int,
+        selectedValueCount: Int,
+        horizontalSwipes: Int,
+        elapsedMs: Long,
+    ) {
+        if (taskId <= 0) return
+        fun record(metricReason: AgentDiagnosticReason, attempt: Int = 0, count: Int) {
+            diagnostic(
+                AgentDiagnosticEvent(
+                    taskId = taskId,
+                    stage = AgentDiagnosticStage.COLOR_DISCOVERY,
+                    reason = metricReason,
+                    attempt = attempt,
+                    elapsedMs = elapsedMs,
+                    candidateCount = count,
+                ),
+            )
+        }
+        rowValueCounts.forEach { (rowIndex, count) ->
+            record(AgentDiagnosticReason.COLOR_ROW_VALUE_COUNT, attempt = rowIndex + 1, count = count)
+        }
+        record(AgentDiagnosticReason.COLOR_FOUND, count = parsedValueCount)
+        record(AgentDiagnosticReason.COLOR_VALUES_NOT_CLICKABLE, count = nonClickableCandidateCount)
+        record(AgentDiagnosticReason.COLOR_SELECTED_VALUE_COUNT, count = selectedValueCount)
+        record(AgentDiagnosticReason.COLOR_HORIZONTAL_SWIPE_COUNT, count = horizontalSwipes)
+        record(AgentDiagnosticReason.COLOR_VERTICAL_SWIPE_COUNT, count = 0)
+        if (reason != AgentDiagnosticReason.COLOR_FOUND) {
+            record(reason, attempt = horizontalSwipes, count = parsedValueCount)
+        }
+    }
+
+    private fun visibleNonClickableColorCandidateCount(
+        screen: ParsedPddScreen,
+        config: PddCollectorConfig,
+        parsedLabels: Set<String>,
+    ): Int {
+        val visible = screen.sourceNodes.filter(SnapshotNode::visible)
+        val compactColorAliases = config.colorAliases.map { it.replace(" ", "") }
+        val heading = visible.asSequence()
+            .filterNot(SnapshotNode::clickable)
+            .filter { node -> compactColorAliases.any { alias -> node.label.replace(" ", "").contains(alias) } }
+            .minByOrNull { it.bounds.top } ?: return 0
+        val allHeadingAliases = (config.colorAliases + config.sizeAliases + config.textAliases.dimension.exactNames +
+            config.textAliases.dimension.adaptiveAliases).map { it.replace(" ", "") }
+        val lowerBound = visible.asSequence()
+            .filterNot(SnapshotNode::clickable)
+            .filter { it.bounds.top >= heading.bounds.bottom }
+            .filter { node -> allHeadingAliases.any { alias -> node.label.replace(" ", "").contains(alias) } }
+            .minOfOrNull { it.bounds.top } ?: Int.MAX_VALUE
+        val paths = visible.map(SnapshotNode::path).toSet()
+        return visible.asSequence()
+            .filter { !it.clickable && it.enabled && it.label.isNotBlank() }
+            .filter { it.bounds.top >= heading.bounds.bottom && it.bounds.bottom <= lowerBound }
+            .filter { it.bounds.width > 0 && it.bounds.height > 0 && it.label.length <= 80 }
+            .filterNot { it.label in parsedLabels }
+            .filterNot { candidate -> paths.any { it.startsWith("${candidate.path}/") } }
+            .count()
+    }
+
     private fun moveSpecPanelToTop(
         goodsId: String,
         config: PddCollectorConfig,
diff --git a/android/app/src/main/java/cn/ilapage/goauto/agent/persistence/AgentDiagnosticStore.kt b/android/app/src/main/java/cn/ilapage/goauto/agent/persistence/AgentDiagnosticStore.kt
index 91a15ae..e087bef 100644
--- a/android/app/src/main/java/cn/ilapage/goauto/agent/persistence/AgentDiagnosticStore.kt
+++ b/android/app/src/main/java/cn/ilapage/goauto/agent/persistence/AgentDiagnosticStore.kt
@@ -9,6 +9,7 @@ import cn.ilapage.goauto.agent.BuildConfig
 enum class AgentDiagnosticStage {
     DETAIL_ENTRY,
     SPEC_PANEL_ENTRY,
+    COLOR_DISCOVERY,
     SIZE_DISCOVERY,
     PAGE_STABILITY,
     SHARE_CLICK,
@@ -35,6 +36,17 @@ enum class AgentDiagnosticReason {
     SIZE_SCAN_LIMIT,
     SIZE_CONTAINER_UNAVAILABLE,
     SIZE_SWIPE_FAILED,
+    COLOR_FOUND,
+    COLOR_EDGE_REACHED,
+    COLOR_SCAN_LIMIT,
+    COLOR_ROW_REFLOWED,
+    COLOR_SWIPE_FAILED,
+    COLOR_CONTAINER_UNAVAILABLE,
+    COLOR_VALUES_NOT_CLICKABLE,
+    COLOR_ROW_VALUE_COUNT,
+    COLOR_SELECTED_VALUE_COUNT,
+    COLOR_HORIZONTAL_SWIPE_COUNT,
+    COLOR_VERTICAL_SWIPE_COUNT,
     PACKAGE_MISMATCH,
     ACTIVITY_MISMATCH,
     SELECTOR_MISMATCH,
diff --git a/android/app/src/test/java/cn/ilapage/goauto/agent/PddProductDetailCollectorTest.kt b/android/app/src/test/java/cn/ilapage/goauto/agent/PddProductDetailCollectorTest.kt
index b4bece2..062df62 100644
--- a/android/app/src/test/java/cn/ilapage/goauto/agent/PddProductDetailCollectorTest.kt
+++ b/android/app/src/test/java/cn/ilapage/goauto/agent/PddProductDetailCollectorTest.kt
@@ -18,6 +18,7 @@ import cn.ilapage.goauto.agent.automation.UiSnapshot
 import cn.ilapage.goauto.agent.persistence.AgentDiagnosticEvent
 import cn.ilapage.goauto.agent.persistence.AgentDiagnosticReason
 import cn.ilapage.goauto.agent.persistence.AgentDiagnosticStage
+import cn.ilapage.goauto.agent.persistence.SafeAgentDiagnosticRecorder
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertFalse
 import org.junit.Assert.assertTrue
@@ -535,6 +536,62 @@ class PddProductDetailCollectorTest {
         assertTrue(driver.swipes.any { it.first == SwipeDirection.UP && it.second != null })
     }
 
+    @Test
+    fun `color discovery records only bounded aggregate evidence`() {
+        val colors = listOf("A色", "B色", "C色", "D色")
+        val events = mutableListOf<AgentDiagnosticEvent>()
+        val driver = FakeCollectorDriver(
+            colors = colors,
+            prices = colors.associateWith { 1000L },
+            rowSize = 2,
+            nonClickableColorCandidates = listOf("隐藏候选"),
+        )
+        var clock = 0L
+
+        val result = PddProductDetailCollector(
+            driver,
+            { clock },
+            { clock += it },
+            taskId = 124,
+            diagnostic = events::add,
+        ).collect(GOODS_ID, rule())
+
+        assertTrue(result.successful)
+        val colorEvents = events.filter { it.stage == AgentDiagnosticStage.COLOR_DISCOVERY }
+        assertEquals(listOf(2, 2), colorEvents.filter { it.reason == AgentDiagnosticReason.COLOR_ROW_VALUE_COUNT }.map { it.candidateCount })
+        assertEquals(4, colorEvents.single { it.reason == AgentDiagnosticReason.COLOR_FOUND }.candidateCount)
+        assertEquals(1, colorEvents.single { it.reason == AgentDiagnosticReason.COLOR_VALUES_NOT_CLICKABLE }.candidateCount)
+        assertEquals(1, colorEvents.single { it.reason == AgentDiagnosticReason.COLOR_SELECTED_VALUE_COUNT }.candidateCount)
+        assertTrue(requireNotNull(colorEvents.single { it.reason == AgentDiagnosticReason.COLOR_HORIZONTAL_SWIPE_COUNT }.candidateCount) > 0)
+        assertEquals(0, colorEvents.single { it.reason == AgentDiagnosticReason.COLOR_VERTICAL_SWIPE_COUNT }.candidateCount)
+        assertTrue(colorEvents.any { it.reason == AgentDiagnosticReason.COLOR_EDGE_REACHED })
+        val persistedText = colorEvents.joinToString()
+        colors.forEach { assertFalse(persistedText.contains(it)) }
+        assertFalse(persistedText.contains("隐藏候选"))
+        assertFalse(persistedText.contains("10.00"))
+    }
+
+    @Test
+    fun `color diagnostic write failure does not change collection result`() {
+        var failureCount = 0
+        val recorder = SafeAgentDiagnosticRecorder(
+            persist = { error("diagnostic database unavailable") },
+            onFailure = { failureCount++ },
+        )
+        var clock = 0L
+
+        val result = PddProductDetailCollector(
+            FakeCollectorDriver(),
+            { clock },
+            { clock += it },
+            taskId = 124,
+            diagnostic = recorder::record,
+        ).collect(GOODS_ID, rule())
+
+        assertTrue(result.successful)
+        assertTrue(failureCount > 0)
+    }
+
     @Test
     fun selectedColorsDisappearingAndReflowingDoNotCreateFalseMissingRows() {
         val colors = listOf("A色", "B色", "C色")
@@ -1093,6 +1150,7 @@ class PddProductDetailCollectorTest {
         private val orderConfirmationAfterEntry: Boolean = false,
         private val orderRestorePagesBeforeSpecs: Int = 0,
         private val sizeHeadingLabel: String = "尺码",
+        private val nonClickableColorCandidates: List<String> = emptyList(),
     ) : PddCollectorDriver {
         var captureCount = 0
         var clickCount = 0
@@ -1182,6 +1240,17 @@ class PddProductDetailCollectorTest {
                         parentPath = "scroll",
                     )
                 }
+                nonClickableColorCandidates.forEachIndexed { index, label ->
+                    nodes += node(
+                        "scroll/non-clickable-color-$index",
+                        label,
+                        30 + index * 230,
+                        650,
+                        220 + index * 230,
+                        690,
+                        parentPath = "scroll",
+                    )
+                }
             }
             if (!continuationPage) nodes += node("scroll/size-heading", sizeHeadingLabel, 20, 700, 300, 750, parentPath = "scroll")
             sizePages[verticalPage.coerceAtMost(sizePages.lastIndex)].forEachIndexed { index, size ->