Ctrl+d enqueued prompts execute in reverse order (LIFO instead of FIFO)

[mpbarbosa]

Describe the bug

When using the Ctrl+d hotkey to enqueue multiple prompts in GitHub Copilot CLI, the execution order is LIFO (Last In, First Out) instead of the expected FIFO (First In, First Out) queue behavior.

COPILOT_CLI_BUG_REPORT_QUEUE_ORDER.md

Affected version

GitHub Copilot CLI 0.0.406.

Steps to reproduce the behavior

Steps to Reproduce

1. Open GitHub Copilot CLI in terminal
2. Enter a prompt: Do it: /path/to/file1.log
3. Press Ctrl+d to enqueue (don't press Enter)
4. Enter another prompt: Do it: /path/to/file2.log
5. Press Ctrl+d to enqueue
6. Enter a third prompt: Do it: /path/to/file3.log
7. Press Ctrl+d to enqueue
8. Press Enter to submit and start execution
9. Observe execution order

Result: Prompts execute in reverse order (3 → 2 → 1)

Expected behavior

Expected Behavior

When enqueuing prompts with Ctrl+d, they should execute in FIFO order:

User actions:
1. Type "Do it: file1.log" + Ctrl+d (enqueue)
2. Type "Do it: file2.log" + Ctrl+d (enqueue)
3. Type "Do it: file3.log" + Ctrl+d (enqueue)

Expected execution order:
1. "Do it: file1.log" (first enqueued)
2. "Do it: file2.log" (second enqueued)
3. "Do it: file3.log" (third enqueued)

This is standard queue behavior (FIFO) as implied by the term "enqueue".

Additional context

Session Context

This behavior was observed during a workflow analysis session where multiple log files needed to be processed in sequence:

Enqueued prompts (in order):

1. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/EXTRACTED_ISSUES.md
2. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step0b_copilot_bootstrap_docs_20260210_221430_21936.log
3. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step2_copilot_consistency_analysis_20260210_222430_24764.log
4. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step5_copilot_directory_validation_20260210_225028_34118.log
5. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step8_copilot_test_analysis_20260210_225304_05334.log
6. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step9_copilot_dependency_analysis_20260210_225759_43390.log
7. Do it: /home/mpb/Documents/GitHub/guia_turistico/.ai_workflow/logs/workflow_20260210_221410/step3_copilot_script_validation_20260210_223930_74349.log

Expected execution order: EXTRACTED_ISSUES → step0b → step2 → step5 → step8 → step9 → step3

Actual execution order: step3 → step9 → step8 → step5 → step2 → step0b → EXTRACTED_ISSUES

This caused the workflow steps to be executed out of logical order.

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Environment

• OS: Linux
• Terminal: (user's terminal environment)
• GitHub Copilot CLI Version: 0.0.406
• Session ID: b5f10731-c0c9-4d94-a90a-c4a3829ef51f
• Date: 2026-02-11