Replay your backend exactly as it ran in production.

Run production code again — exactly as it happened.

Production failure snapshot

Status

failed (503)

Total time

1280ms

Network calls

3

Broke at inventory check (503). This is a real execution.

Timeline

Timeline

What happened → Where it broke → Continue

Timeline + detail workstationFocus: 503 failure

Timeline

7 events
#1function calledspan+0ms
Request
{
  "entry": "app/api/orders/[id].ts",
  "name": "orders.getById"
}

Replay

Replay

Capture → Jump → Continue

Replay Execution

Re-run this execution on your agent using the original captured inputs. Encrypted env values are decrypted locally — nothing leaves your machine.

inputsoriginal captured argumentsenvrecorded env snapshot, decrypted locallycodecurrent version on agentoriginal2.28s

Network

Network

Replay from here →

Highlighted: inventory check failed (503)Replay from this failure →

Real execution (not sampled)

GET/orders/ord_01
200180ms
Service:api.example.com
Size:421 B
No impact on execution
POST/stock/check
503670ms
Service:inventory.example.com
Size:149 B
Broke execution
POST/authorize
201200ms
Service:payments.example.com
Size:114 B
No impact on execution
POST/stock/check

Request Summary

URL:
https://inventory.example.com/stock/check
Status:
503
Duration:
670ms
Service:
inventory.example.com
Size:
149 B
Retries:
0
Impact:
Broke execution
🔥 This request failed with a server error, breaking the execution.
Upstream service returned an error status.

Failed Request: 503

This request resulted in an error status code. Check the Response tab for more details about the failure.

Sensitive Data

No encrypted segments in this request.

Performance

Performance

Time breakdown

Performance Summary

Total Time1.28s (1280ms)
Slowest Span
ConcurrencySequential
Potential Savings: ~380ms
InsightExecution is fully sequential. 3 I/O calls executed one after another → Causing 1050ms total latency. If parallelized → expected ~900ms

Bottlenecks

1.POST /stock/check Slow
External call latency670ms(52%)
2.POST /authorize
External call latency200ms(16%)
3.GET /orders/ord_01
External call latency180ms(14%)

Critical Path

return
Total execution path bound: 1050ms

Execution Waterfall

0s0.64s1.28s

Time Breakdown

Resource Type
Compute: 230msWait: 1050ms
By Capability
POST /stock/check1x670ms
POST /authorize1x200ms
GET /orders/ord_011x180ms

Flow

Request flow

Root handler → services → result

Request Flow

5

Selected request

app/api/orders/[id].ts

Root handler → services → result.

Replay production failures.

Timeline, network, performance, and flow are the same surfaces used in the app, shown as one debugging narrative.

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