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Root Cause Analysis: [REDACTED]'s Crashed Task

User Identified

Name: [REDACTED] ([REDACTED]) %' query on users table]
User ID: [REDACTED]

The Problematic Chat Session

Chat Title: "Interest Rates and Occupancy"
Task: Industrial real estate occupancy rate forecasting with regression models, time-lagged economic variables

The Crashed Agent Activity Session

Field	Value
Activity ID	[REDACTED]
Title	"Monthly Quarterly Yearly Tasks"
Final Phase	crashed
Started	March 3, 2026 at 5:06:03 AM UTC
Duration	~25 minutes of activity

ROOT CAUSE: Spreadsheet File Reference Error

The failed tool call at sequence 133:

Code5 lines

1Tool: spreadsheet_style2File ID: [REDACTED]3Sheet: "Regression Model"4Range: B265Error: "The specified key does not exist"

What happened: The agent attempted to format cell B26 in the "Regression Model" sheet, but the spreadsheet file couldn't be found. This indicates a stale file reference—the file_id was no longer valid, likely cleaned up or expired between operations.

Timeline of the Failure

Time (UTC)	Event
05:06:03	Session started
05:24:41	TOOL CALL FAILED - spreadsheet_style error (~18 min mark)
05:29:47	Agent entered "Revising (iteration 2)" attempting recovery
05:31:34	Session interrupted with message about unexpected interruption

User's Description vs. Reality

The user reported:

"Error at 20 min mark" → Confirmed: Tool failure at ~18 minutes
"Automatically resolving it" → Confirmed: Agent attempted recovery through revision iterations
Session marked as interrupted with "no credits used" message

Other Sessions (Completed Successfully)

Two other long-running sessions in the same chat completed successfully:

Title	Duration	Status
Occupancy Rate Forecasting	48 min	Complete
Occupancy Rate Forecasting	43 min	Complete

Technical Summary

Primary Issue: The agent referenced a spreadsheet file that no longer existed. When spreadsheet_style was called, it failed with "The specified key does not exist."

Why this caused a crash: The file reference error occurred during a critical formatting operation. While the agent attempted to recover through revision iterations, it was ultimately unable to complete the task.

Recommendation: This is a file lifecycle/persistence issue. The system should validate file existence before operations or handle file-not-found errors more gracefully.