Kimi K2 via AWS BEDROCK stops execution

[FarrukhCyber]

Description

I'm using Kimi K2 Thinking from bedrock and get the following error in plan mode:
undefined: The content field in the Message object at messages.3 is empty. Add a ContentBlock object to the content field and try again.

Plugins

No response

OpenCode version

No response

Steps to reproduce

No response

Screenshot and/or share link

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Operating System

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Terminal

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[github-actions]

This issue might be a duplicate of existing issues. Please check:

• toolResults sent to AWS/Bedrock models rejected for missing json subdocument #11035: toolResults sent to AWS/Bedrock models rejected for missing json subdocument (similar AWS Bedrock content validation errors)
• Amazon Bedrock Kimi2 Thinking output #5630: Amazon Bedrock Kimi2 Thinking output (exact same model + service combination with similar content handling issues)
• Kimi for Coding (k2p5) fails with tool calls when thinking enabled: reasoning_content is missing in assistant tool call message #10996: Kimi K2.5 fails with tool calls when thinking enabled (nearly identical error pattern with missing content field)
• Qwen3 as well as Kimi K2 keep stopping mid-chat #1522: Qwen3 as well as Kimi K2 keep stopping mid-chat (Kimi K2 execution stops during operation)
• Kimi K2 Thinking tool calling problems - missing arguments. #9878: Kimi K2 Thinking tool calling problems - missing arguments (empty content in message fields, similar root cause)

Feel free to ignore if none of these address your specific case.

[rekram1-node]

can u do opencode export > session.json (run it in your terminal) and send me the file?

[Ilia-TheNetworkFirm]

I have the same problem with AWS Bedrock. It just stops working, no errors. This is the last message from the session

    {
      "info": {
        "id": "msg_c0e43e070001hTCBgH6Zrlvy5d",
        "sessionID": "ses_3f1bc2d5bffe8l5qIdzMHGrHwi",
        "role": "assistant",
        "time": {
          "created": 1769765855344,
          "completed": 1769765856801
        },
        "parentID": "msg_c0e43d2a9001pMXmtXI2LMRfhw",
        "modelID": "moonshot.kimi-k2-thinking",
        "providerID": "amazon-bedrock",
        "mode": "build",
        "agent": "build",
        "path": {
          "cwd": "/app/redacted",
          "root": "/app/redacted"
        },
        "cost": 0.0097642,
        "tokens": {
          "input": 16032,
          "output": 58,
          "reasoning": 0,
          "cache": {
            "read": 0,
            "write": 0
          }
        },
        "finish": "stop"
      },
      "parts": [
        {
          "id": "prt_c0e43e493001pVJ767CY6ZbyDX",
          "sessionID": "ses_3f1bc2d5bffe8l5qIdzMHGrHwi",
          "messageID": "msg_c0e43e070001hTCBgH6Zrlvy5d",
          "type": "step-start",
          "snapshot": "1b7f4a67e65f4eed88bad8209cdba3c06dbcd0af"
        },
        {
          "id": "prt_c0e43e494001gSwAL8wgyxEHpO",
          "sessionID": "ses_3f1bc2d5bffe8l5qIdzMHGrHwi",
          "messageID": "msg_c0e43e070001hTCBgH6Zrlvy5d",
          "type": "reasoning",
          "text": " Now let me check the api POST handler: <|tool_calls_section_begin|> <|tool_call_begin|> tooluse_Vbs57l9NT6-Lu5tgQRwYjA{\"filePath\": \"/app/redacted/apps/api\"} <|tool_call_end|> <|tool_calls_section_end|>",
          "time": {
            "start": 1769765856404,
            "end": 1769765856722
          }
        },
        {
          "id": "prt_c0e43e5d3001w6VIfnEZTNfCZ7",
          "sessionID": "ses_3f1bc2d5bffe8l5qIdzMHGrHwi",
          "messageID": "msg_c0e43e070001hTCBgH6Zrlvy5d",
          "type": "step-finish",
          "reason": "stop",
          "snapshot": "1b7f4a67e65f4eed88bad8209cdba3c06dbcd0af",
          "cost": 0.0097642,
          "tokens": {
            "input": 16032,
            "output": 58,
            "reasoning": 0,
            "cache": {
              "read": 0,
              "write": 0
            }
          }
        }
      ]
    }

[aries1980]

I can confirm the same error with AWS Bedrock with Minimax M2 (after a while), Kimi K2 (after a while), but the Claude Sonnet and Opus 4.5 and AWS Nova Pro works just fine.

[FarrukhCyber]

I can confirm the same error with AWS Bedrock with Minimax M2 (after a while), Kimi K2 (after a while), but the Claude Sonnet and Opus 4.5 and AWS Nova Pro works just fine.

I tried Minimax M2 from AWS Bedrock and it worked fine, but I will try it on a long running task. I'm using opencode version 1.1.42

[wwnbb]

have the same issue with kimi 2.5 on chutes:

▼ 21:52:47 [DEBUG] message_part_updated
  {
    data = {
      _directory = "/Users/admin/work/lua/opencode.nvim",
      part = {
        id = "prt_c5331af40001C45ZG6iO3Atuv4",
        messageID = "msg_c5331a388001LciZI4AcrQA9nK",
        sessionID = "ses_3accfab03ffeUoFBVUj3SfoIEL",
        text = " ## Analysis\n\nNow I understand the issue! The user cannot enter normal mode while using the widget for selecting models. Let me analyze the keymaps in the `create_sea... <|tool_calls_section_begin|> <|tool_call_begin|> functions.grep:6 <|tool_call_argument_begin|> {"pattern": "startinsert", "path": "/Users/admin/work/lua/opencode.nvim", "include": "*.lua"} <|tool_call_end|> <|tool_calls_section_end|>
        time = {
          ["end"] = 1770922367158,
          start = 1770922291008
        },
        type = "reasoning"
      }
    }
  }

[JayThomason]

I am seeing this with some regularity using bedrock. Two different error messages:

undefined: There is nothing available to cache. Please remove the invalid cache point and try again.
...
undefined: The content field in the Message object at messages.99 is empty. Add a ContentBlock object to the content field and try again.

I haven't figured out a good workaround. Forking the session doesn't seem to fix it consistently.

[rekram1-node]

Yeah I think Ik why this happens.

[bbartels]

Running into this as well

[angelDrivana]

Any updates on this? fix?