diff --git a/scripts/src/hwlab-node-web-observe-runner-source.ts b/scripts/src/hwlab-node-web-observe-runner-source.ts
index 60997180..c6b57709 100644
--- a/scripts/src/hwlab-node-web-observe-runner-source.ts
+++ b/scripts/src/hwlab-node-web-observe-runner-source.ts
@@ -1259,6 +1259,7 @@ function buildSampleMetrics(samples, control) {
   });
   const turnTiming = buildTurnTimingTable(samples, timeline);
   const turnCells = turnTiming.rows.flatMap((row) => Object.values(row.cells || {}));
+  const turnTimingNonMonotonic = Array.isArray(turnTiming.nonMonotonic) ? turnTiming.nonMonotonic : [];
   const withTotal = timeline.filter((item) => item.totalElapsedSeconds !== null).length;
   const withRecent = timeline.filter((item) => item.recentUpdateSeconds !== null).length;
   const diagnostics = timeline.filter((item) => item.diagnosticSeen).length;
@@ -1274,11 +1275,15 @@ function buildSampleMetrics(samples, control) {
       turnColumns: turnTiming.columns.length,
       turnTimingRows: turnTiming.rows.length,
       turnCellsWithTotalElapsed: turnCells.filter((item) => item.totalElapsedSeconds !== null).length,
-      turnCellsWithRecentUpdate: turnCells.filter((item) => item.recentUpdateSeconds !== null).length
+      turnCellsWithRecentUpdate: turnCells.filter((item) => item.recentUpdateSeconds !== null).length,
+      turnTimingNonMonotonicCount: turnTimingNonMonotonic.length,
+      turnTimingTotalElapsedDecreaseCount: turnTimingNonMonotonic.filter((item) => item.metric === "totalElapsedSeconds").length,
+      turnTimingRecentUpdateDecreaseCount: turnTimingNonMonotonic.filter((item) => item.metric === "recentUpdateSeconds").length
     },
     rounds,
     turnColumns: turnTiming.columns,
     turnTimingTable: turnTiming.rows,
+    turnTimingNonMonotonic,
     timeline
   };
 }
@@ -1338,7 +1343,73 @@ function buildTurnTimingTable(samples, timeline) {
       cells
     });
   }
-  return { columns, rows };
+  return { columns, rows, nonMonotonic: detectTurnTimingNonMonotonic(columns, rows) };
+}
+
+function detectTurnTimingNonMonotonic(columns, rows) {
+  const events = [];
+  for (const column of columns) {
+    const previousByMetric = new Map();
+    for (const row of rows) {
+      const cell = row.cells?.[column.id];
+      if (!cell) continue;
+      for (const metric of ["totalElapsedSeconds", "recentUpdateSeconds"]) {
+        const value = cell[metric];
+        if (value === null || value === undefined || !Number.isFinite(Number(value))) continue;
+        const current = Number(value);
+        const previous = previousByMetric.get(metric);
+        if (previous && current < previous.value) {
+          events.push({
+            columnId: column.id,
+            columnLabel: column.label,
+            metric,
+            fromSeq: previous.seq,
+            fromTs: previous.ts,
+            fromValue: previous.value,
+            toSeq: row.seq ?? null,
+            toTs: row.ts ?? null,
+            toValue: current,
+            delta: current - previous.value,
+            traceId: cell.traceId ?? column.traceId ?? null,
+            messageId: cell.messageId ?? column.messageId ?? null,
+            promptIndex: cell.promptIndex ?? row.promptIndex ?? null,
+            source: cell.source ?? column.source ?? null,
+            valuesRedacted: true
+          });
+        }
+        if (previous && metric === "recentUpdateSeconds") {
+          const elapsedMs = Date.parse(String(row.ts ?? "")) - Date.parse(String(previous.ts ?? ""));
+          const elapsedSeconds = Number.isFinite(elapsedMs) && elapsedMs >= 0 ? elapsedMs / 1000 : null;
+          const allowedIncrease = elapsedSeconds === null ? 10 : Math.max(10, elapsedSeconds + 5);
+          const increase = current - previous.value;
+          if (increase > allowedIncrease) {
+            events.push({
+              columnId: column.id,
+              columnLabel: column.label,
+              metric: "recentUpdateSeconds",
+              anomaly: "jump",
+              fromSeq: previous.seq,
+              fromTs: previous.ts,
+              fromValue: previous.value,
+              toSeq: row.seq ?? null,
+              toTs: row.ts ?? null,
+              toValue: current,
+              delta: increase,
+              sampleDeltaSeconds: elapsedSeconds,
+              allowedIncreaseSeconds: allowedIncrease,
+              traceId: cell.traceId ?? column.traceId ?? null,
+              messageId: cell.messageId ?? column.messageId ?? null,
+              promptIndex: cell.promptIndex ?? row.promptIndex ?? null,
+              source: cell.source ?? column.source ?? null,
+              valuesRedacted: true
+            });
+          }
+        }
+        previousByMetric.set(metric, { value: current, seq: row.seq ?? null, ts: row.ts ?? null });
+      }
+    }
+  }
+  return events;
 }
 
 function turnMetricItems(sample, timelineItem) {
@@ -1610,7 +1681,11 @@ function renderTurnTimingTable(sampleMetrics) {
     lines.push("| " + cells.map(escapeMarkdownCell).join(" | ") + " |");
   }
   const columnLines = columns.map((column) => "- " + column.label + ": source=" + (column.source || "-") + " prompt=" + (column.promptIndex ?? "-") + " lastPrompt=" + (column.lastPromptIndex ?? "-") + " firstSeq=" + (column.firstSeq ?? "-") + " lastSeq=" + (column.lastSeq ?? "-") + " traceId=" + (column.traceId || "-") + " messageId=" + (column.messageId || "-")).join("\n");
-  return lines.join("\n") + "\n\n列说明：\n" + columnLines;
+  const nonMonotonic = Array.isArray(sampleMetrics?.turnTimingNonMonotonic) ? sampleMetrics.turnTimingNonMonotonic : [];
+  const nonMonotonicLines = nonMonotonic.length > 0
+    ? nonMonotonic.slice(0, 80).map((item) => "- " + (item.columnLabel || item.columnId || "-") + " " + item.metric + (item.anomaly ? " " + item.anomaly : "") + " " + (item.fromValue ?? "-") + " -> " + (item.toValue ?? "-") + " delta=" + (item.delta ?? "-") + " sampleDelta=" + (item.sampleDeltaSeconds ?? "-") + " allowed=" + (item.allowedIncreaseSeconds ?? "-") + " seq " + (item.fromSeq ?? "-") + " -> " + (item.toSeq ?? "-") + " ts " + (item.fromTs || "-") + " -> " + (item.toTs || "-") + " traceId=" + (item.traceId || "-")).join("\n")
+    : "- 未观察到数值下降事件。";
+  return lines.join("\n") + "\n\n列说明：\n" + columnLines + "\n\n非单调/跳增事件（仅报表暴露，不做下游 repair）：\n" + nonMonotonicLines;
 }
 
 function formatMetricCell(value) {