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Engine Failure: The copilot engine terminated unexpectedly.
Last agent output:
400 Invalid 'input[32].id': 'ctc_call_0YCU8dispTejGJgaDoIk0SGR'. Expected an ID that begins with 'fc'.
Changes +10 -0
Duration 57s
Tokens ↑ 171.2k (122.9k cached) • ↓ 3.3k (2.2k reasoning)
Resume copilot --resume=4f419500-5cc0-4f4a-80aa-8ef70c650a4d
400 Invalid 'input[32].id': 'ctc_call_0YCU8dispTejGJgaDoIk0SGR'. Expected an ID that begins with 'fc'.
Changes +10 -0
Duration 1m 18s
Tokens ↑ 171.2k (122.9k cached) • ↓ 3.3k (2.2k reasoning)
Resume copilot --resume=4f419500-5cc0-4f4a-80aa-8ef70c650a4d
Action Required
Assign this issue to an agent to debug and fix the issue.
Debug with any coding agent
Use this prompt with any coding agent (GitHub Copilot, Claude, Gemini, etc.):
Debug the agentic workflow failure using https://raw.githubusercontent.com/github/gh-aw/main/debug.md
The failed workflow run is at https://github.com/github/gh-aw/actions/runs/35755066916
Manually invoke the agent
Debug this workflow failure using your favorite Agent CLI and the agentic-workflows prompt.
Reproduced independently across copilot/gpt-5.3-codex and copilot/gpt-5.6-terra, including Copilot CLI 1.0.90-2, after correct Responses routing and the first permitted edit. Canonical tracking issue: #64282. This is not the older /chat/completions model-routing defect.
Activity
github-actions commentedon Sep 22, 2026
Agent job 35769055153 failed.
Warning
Engine Failure: The
copilotengine terminated unexpectedly.Last agent output:
github-actions commentedon Sep 22, 2026
Agent job 35773750677 failed.
Warning
Engine Failure: The
copilotengine terminated unexpectedly.Last agent output:
github-actions commentedon Sep 22, 2026
Agent job 35786005948 failed.
Warning
Engine Failure: The
copilotengine terminated unexpectedly.Last agent output:
github-actions commentedon Sep 22, 2026
Agent job 35786197515 failed.
Warning
Engine Failure: The
copilotengine terminated unexpectedly.Last agent output:
github-actions commentedon Sep 23, 2026
This issue was automatically closed because it expired on 2026-09-23T04:53:18.931Z.
anthonyhull-ford commentedon Sep 29, 2026
Reproduced independently across
copilot/gpt-5.3-codexandcopilot/gpt-5.6-terra, including Copilot CLI1.0.90-2, after correct Responses routing and the first permitted edit. Canonical tracking issue: #64282. This is not the older/chat/completionsmodel-routing defect.