add elements to step_end in Trace

sentience/agent.py

@@ -486,6 +486,11 @@ def act(  # noqa: C901
                         "signals": verify_signals,
                     }
 
+                    # Build elements data for pre field (include diff_status from snap_with_diff)
+                    # Use the same format as build_snapshot_event for consistency
+                    snapshot_event_data = TraceEventBuilder.build_snapshot_event(snap_with_diff)
+                    pre_elements = snapshot_event_data.get("elements", [])
+
                     # Build complete step_end event
                     step_end_data = TraceEventBuilder.build_step_end_event(
                         step_id=step_id,
@@ -498,6 +503,7 @@ def act(  # noqa: C901
                         llm_data=llm_data,
                         exec_data=exec_data,
                         verify_data=verify_data,
+                        pre_elements=pre_elements,
                     )
 
                     _safe_tracer_call(
@@ -1045,6 +1051,11 @@ async def act(  # noqa: C901
                         "signals": verify_signals,
                     }
 
+                    # Build elements data for pre field (include diff_status from snap_with_diff)
+                    # Use the same format as build_snapshot_event for consistency
+                    snapshot_event_data = TraceEventBuilder.build_snapshot_event(snap_with_diff)
+                    pre_elements = snapshot_event_data.get("elements", [])
+
                     # Build complete step_end event
                     step_end_data = TraceEventBuilder.build_step_end_event(
                         step_id=step_id,
@@ -1057,6 +1068,7 @@ async def act(  # noqa: C901
                         llm_data=llm_data,
                         exec_data=exec_data,
                         verify_data=verify_data,
+                        pre_elements=pre_elements,
                     )
 
                     _safe_tracer_call(

sentience/extension/background.js

@@ -144,13 +144,13 @@ async function handleScreenshotCapture(_tabId, options = {}) {
 async function handleSnapshotProcessing(rawData, options = {}) {
     const MAX_ELEMENTS = 10000; // Safety limit to prevent hangs
     const startTime = performance.now();
-    
+
     try {
         // Safety check: limit element count to prevent hangs
         if (!Array.isArray(rawData)) {
             throw new Error('rawData must be an array');
         }
-        
+
         if (rawData.length > MAX_ELEMENTS) {
             console.warn(`[Sentience Background] ⚠️ Large dataset: ${rawData.length} elements. Limiting to ${MAX_ELEMENTS} to prevent hangs.`);
             rawData = rawData.slice(0, MAX_ELEMENTS);
@@ -186,7 +186,7 @@ async function handleSnapshotProcessing(rawData, options = {}) {
             // Add timeout protection (18 seconds - less than content.js timeout)
             analyzedElements = await Promise.race([
                 wasmPromise,
-                new Promise((_, reject) => 
+                new Promise((_, reject) =>
                     setTimeout(() => reject(new Error('WASM processing timeout (>18s)')), 18000)
                 )
             ]);

sentience/extension/content.js

@@ -92,7 +92,7 @@ function handleSnapshotRequest(data) {
                 if (responded) return; // Already responded via timeout
                 responded = true;
                 clearTimeout(timeoutId);
-                
+
                 const duration = performance.now() - startTime;
 
                 // Handle Chrome extension errors (e.g., background script crashed)