The request body is not valid JSON. (Request ID: e4839509-2213-434e-827d-4b07141f6c90)

[Qa2013]

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• I have searched for duplicate or closed issues

Operating System

win32

Kiro Version

0.12.184

Bug Description

The request body is not valid JSON. (Request ID: e4839509-2213-434e-827d-4b07141f6c90)

Steps to Reproduce

ص

Expected Behavior

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Conversation ID

d68a01f2-e611-44c8-aafb-59b98b53dfb6
d68a01f2-e611-44c8-aafb-59b98b53dfb6

Additional Context

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[github-actions]

🤖 Potential Duplicate Detected

This issue appears to be similar to:

• #5768: kiro-cli ValidationException After Image + Model Switch (85% similar)

What happens next?

• ⏰ This issue will be automatically closed in 3 days
• 🏷️ If this is not a duplicate, you can prevent automatic closure by adding a comment or reacting with 👎 to this message.
• 💬 Comment on the original issue if you have additional information

Why is this marked as duplicate?
Both report ValidationException errors in kiro-cli with similar error patterns and request IDs, suggesting the same underlying JSON validation issue

[github-actions]

This issue has been automatically closed as it appears to be a duplicate of #5768.

If you believe this is incorrect, please comment on this issue and a maintainer will review it.

[Kiddonova]

same issue, 2026-05-18 20:31:05.591 [error] Failed to stream response chunks Bedrock error message: The model returned the following errors: The request body is not valid JSON.
2026-05-18 20:31:05.611 [error] Pe7: Bedrock error message: The model returned the following errors: The request body is not valid JSON.
at L16 (/home/kiddonova/.kiro-server/bin/2406958adc70afa75e5473a3ec1f0cd3da68ec6d/extensions/kiro.kiro-agent/dist/extension.js:402088:383)
at It5._streamResponseChunks (/home/kiddonova/.kiro-server/bin/2406958adc70afa75e5473a3ec1f0cd3da68ec6d/extensions/kiro.kiro-agent/dist/extension.js:402945:23)
at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
at async It5._streamIterator (/home/kiddonova/.kiro-server/bin/2406958adc70afa75e5473a3ec1f0cd3da68ec6d/extensions/kiro.kiro-agent/dist/extension.js:349917:30)
2026-05-18 20:31:05.611 [info] [Execution] Completed with error Bedrock error message: The model returned the following errors: The request body is not valid JSON.
2026-05-18 20:31:05.617 [info] [agent-event-polling] Polling stopped
2026-05-18 20:31:05.642 [info] [SupervisedDiffSync] Cleaned up supervised diff sessions for execution {"executionId":"7d2bd4d9-8581-45f3-b959-582d84df21a6"}
2026-05-18 20:31:05.707 [info] [agent-controller] Progressing model queue {"activeExecution":false,"queueSize":0}

[github-actions]

Thank you for your feedback! 🙏

The duplicate label has been removed and this issue has been sent back for maintainer review.

A maintainer will review this issue shortly.

[Kiddonova]

to solve this issue, just create the plus button to create a new session