prevent large traces from causing get_run_details failures

Author: ericallam

apps/webapp/app/env.server.ts

@@ -436,6 +436,7 @@ const EnvironmentSchema = z.object({
   EVENT_LOOP_MONITOR_ENABLED: z.string().default("1"),
   MAXIMUM_LIVE_RELOADING_EVENTS: z.coerce.number().int().default(1000),
   MAXIMUM_TRACE_SUMMARY_VIEW_COUNT: z.coerce.number().int().default(25_000),
+  MAXIMUM_TRACE_DETAILED_SUMMARY_VIEW_COUNT: z.coerce.number().int().default(10_000),
   TASK_PAYLOAD_OFFLOAD_THRESHOLD: z.coerce.number().int().default(524_288), // 512KB
   TASK_PAYLOAD_MAXIMUM_SIZE: z.coerce.number().int().default(3_145_728), // 3MB
   BATCH_TASK_PAYLOAD_MAXIMUM_SIZE: z.coerce.number().int().default(1_000_000), // 1MB

apps/webapp/app/v3/taskEventStore.server.ts

@@ -285,7 +285,7 @@ export class TaskEventStore {
               : Prisma.empty
           }
         ORDER BY "startTime" ASC
-        LIMIT ${env.MAXIMUM_TRACE_SUMMARY_VIEW_COUNT}
+        LIMIT ${env.MAXIMUM_TRACE_DETAILED_SUMMARY_VIEW_COUNT}
       `;
     } else {
       return await this.readReplica.$queryRaw<DetailedTraceEvent[]>`
@@ -320,7 +320,7 @@ export class TaskEventStore {
               : Prisma.empty
           }
         ORDER BY "startTime" ASC
-        LIMIT ${env.MAXIMUM_TRACE_SUMMARY_VIEW_COUNT}
+        LIMIT ${env.MAXIMUM_TRACE_DETAILED_SUMMARY_VIEW_COUNT}
       `;
     }
   }

packages/cli-v3/src/mcp/formatters.ts

@@ -5,6 +5,8 @@ import {
 } from "@trigger.dev/core/v3/schemas";
 import type { CursorPageResponse } from "@trigger.dev/core/v3/zodfetch";
 
+const MAX_TRACE_LINES = 1000;
+
 export function formatRun(run: RetrieveRunResponse): string {
   const lines: string[] = [];
 
@@ -177,16 +179,25 @@ export function formatRunTrace(trace: RetrieveRunTraceResponseBody["trace"]): st
   lines.push("");
 
   // Format the root span and its children recursively
-  formatSpan(trace.rootSpan, lines, 0);
+  const reachedMaxLines = formatSpan(trace.rootSpan, lines, 0, MAX_TRACE_LINES);
+
+  if (reachedMaxLines) {
+    lines.push(`(truncated logs to ${MAX_TRACE_LINES} lines)`);
+  }
 
   return lines.join("\n");
 }
 
 function formatSpan(
   span: RetrieveRunTraceResponseBody["trace"]["rootSpan"],
   lines: string[],
-  depth: number
-): void {
+  depth: number,
+  maxLines: number
+): boolean {
+  if (lines.length >= maxLines) {
+    return true;
+  }
+
   const indent = "  ".repeat(depth);
   const prefix = depth === 0 ? "└─" : "├─";
 
@@ -263,14 +274,20 @@ function formatSpan(
 
   // Recursively format children
   if (span.children) {
-    span.children.forEach((child, index) => {
-      formatSpan(child, lines, depth + 1);
+    const reachedMaxLines = span.children.some((child, index) => {
+      const reachedMaxLines = formatSpan(child, lines, depth + 1, maxLines);
       // Add spacing between sibling spans (except for the last one)
-      if (index < span.children.length - 1) {
+      if (index < span.children.length - 1 && !reachedMaxLines) {
         lines.push("");
       }
+
+      return reachedMaxLines;
     });
+
+    return reachedMaxLines;
   }
+
+  return false;
 }
 
 function getStatusIndicator(