Report failed chain steps in the export

api-tester.html

@@ -747,6 +747,7 @@
                     prompts: [],
                     responses: [],
                     steps: laneRuns.get(laneId)?.steps || [],
+                    failures: Object.fromEntries(laneRuns.get(laneId)?.failures || []),
                     stats: aggregateLaneStats(laneRuns.get(laneId)?.steps || [])
                 };
 
@@ -790,9 +791,10 @@
 
                 lane.prompts.forEach((prompt, i) => {
                     text += `[Prompt ${i+1}]: ${prompt.slice(0, 100)}${prompt.length > 100 ? '...' : ''}\n`;
-                    const step = lane.steps[i];
+                    const step = lane.steps.find(s => s.step === i + 1);
                     if (!step) {
-                        text += `[Response ${i+1}]: (not run)\n\n`;
+                        const failure = lane.failures[i + 1];
+                        text += `[Response ${i+1}]: ${failure ? `failed · ${failure}` : '(not run)'}\n\n`;
                         return;
                     }
                     text += `[Response ${i+1}]: ${describeStep(step)}\n`;
@@ -1418,7 +1420,7 @@
             statsSection.style.display = 'grid';
 
             let previousResponseId = null;
-            const laneRun = { steps: [] };
+            const laneRun = { steps: [], failures: new Map() };
             laneRuns.set(laneId, laneRun);
 
             for (let step = 1; step <= chainCount; step++) {
@@ -1458,6 +1460,7 @@
                     });
 
                     previousResponseId = result.responseId;
+                    result.summary.step = step;
                     laneRun.steps.push(result.summary);
                     const stats = aggregateLaneStats(laneRun.steps);
                     for (const key of ['ttft', 'tps', 'out', 'tools', 'total', 'cost']) {
@@ -1472,6 +1475,7 @@
                 } catch (error) {
                     document.getElementById(`${laneId}-output-${step}`).textContent = `Error: ${error.message}`;
                     document.getElementById(`${laneId}-dot-${step}`).className = 'status-dot error';
+                    laneRun.failures.set(step, error.message);
                     break; // Stop chain on error
                 }
             }