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[GH-ISSUE #2486] [BUG]: AWS Bedrock - This model doesn't support system messages #1612

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opened 2026-02-22 18:25:40 -05:00 by yindo · 6 comments
yindo commented 2026-02-22 18:25:40 -05:00
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Originally created by @dabump on GitHub (Oct 16, 2024).
Original GitHub issue: https://github.com/Mintplex-Labs/anything-llm/issues/2486

Originally assigned to: @timothycarambat on GitHub.

How are you running AnythingLLM?

Docker (local)

What happened?

Hi all. Need some help please.

Enabled the 'Titan Text G1 - Express' foundation model in AWS Bedrock. Getting this message when trying to interact in workspace.

'This model doesn't support system messages. Try again without a system message or use a model that supports system messages.'

Can anybody shed some light on what I'm doing wrong or have any suggestions?

image

[backend] error: ValidationException: This model doesn't support system messages. Try again without a system message or use a model that supports system messages. at de_ValidationExceptionRes (/app/server/node_modules/@aws-sdk/client-bedrock-runtime/dist-cjs/index.js:1159:21) at de_CommandError (/app/server/node_modules/@aws-sdk/client-bedrock-runtime/dist-cjs/index.js:1008:19) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async /app/server/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20 at async /app/server/node_modules/@smithy/core/dist-cjs/index.js:165:18 at async /app/server/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38 at async /app/server/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22 at async ChatBedrockConverse._streamResponseChunks (/app/server/node_modules/@langchain/aws/dist/chat_models.cjs:250:26) at async ChatBedrockConverse._streamIterator (/app/server/node_modules/@langchain/aws/node_modules/@langchain/core/dist/language_models/chat_models.cjs:93:34) at async ChatBedrockConverse.transform (/app/server/node_modules/@langchain/aws/node_modules/@langchain/core/dist/runnables/base.cjs:394:9)

Are there known steps to reproduce?

No response

Originally created by @dabump on GitHub (Oct 16, 2024). Original GitHub issue: https://github.com/Mintplex-Labs/anything-llm/issues/2486 Originally assigned to: @timothycarambat on GitHub. ### How are you running AnythingLLM? Docker (local) ### What happened? Hi all. Need some help please. Enabled the 'Titan Text G1 - Express' foundation model in AWS Bedrock. Getting this message when trying to interact in workspace. 'This model doesn't support system messages. Try again without a system message or use a model that supports system messages.' Can anybody shed some light on what I'm doing wrong or have any suggestions? ![image](https://github.com/user-attachments/assets/979c53b0-d341-466c-9627-f8585cea815b) `[backend] error: ValidationException: This model doesn't support system messages. Try again without a system message or use a model that supports system messages. at de_ValidationExceptionRes (/app/server/node_modules/@aws-sdk/client-bedrock-runtime/dist-cjs/index.js:1159:21) at de_CommandError (/app/server/node_modules/@aws-sdk/client-bedrock-runtime/dist-cjs/index.js:1008:19) at process.processTicksAndRejections (node:internal/process/task_queues:95:5) at async /app/server/node_modules/@smithy/middleware-serde/dist-cjs/index.js:35:20 at async /app/server/node_modules/@smithy/core/dist-cjs/index.js:165:18 at async /app/server/node_modules/@smithy/middleware-retry/dist-cjs/index.js:320:38 at async /app/server/node_modules/@aws-sdk/middleware-logger/dist-cjs/index.js:34:22 at async ChatBedrockConverse._streamResponseChunks (/app/server/node_modules/@langchain/aws/dist/chat_models.cjs:250:26) at async ChatBedrockConverse._streamIterator (/app/server/node_modules/@langchain/aws/node_modules/@langchain/core/dist/language_models/chat_models.cjs:93:34) at async ChatBedrockConverse.transform (/app/server/node_modules/@langchain/aws/node_modules/@langchain/core/dist/runnables/base.cjs:394:9) ` ### Are there known steps to reproduce? _No response_
yindo added the possible buginvestigating labels 2026-02-22 18:25:40 -05:00
yindo closed this issue 2026-02-22 18:25:40 -05:00
yindo commented 2026-02-22 18:25:40 -05:00
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@timothycarambat commented on GitHub (Oct 16, 2024):

Hm, this is odd. I thought the Titan model did support system messages? That is all that is going on here. Using any other foundational model and this would not be an issue (llama, mistral, Claude).

Will investigate this tonight/tomorrow AM

@timothycarambat commented on GitHub (Oct 16, 2024): Hm, this is odd. I thought the Titan model did support system messages? That is all that is going on here. Using any other foundational model and this would not be an issue (llama, mistral, Claude). Will investigate this tonight/tomorrow AM
yindo commented 2026-02-22 18:25:40 -05:00
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@timothycarambat commented on GitHub (Oct 16, 2024):

Ah, so yes. While not obviously documented by AWS - the Titan models indeed work with a system message. Unfortunately this also breaks RAG for chats so we will need to patch this behavior for bedrock models that do not use system messages. Easily done, will have PR tomorrow (it is late by me currently)

@timothycarambat commented on GitHub (Oct 16, 2024): Ah, so yes. While not obviously documented by AWS - the Titan models indeed work with a system message. Unfortunately this also breaks RAG for chats so we will need to patch this behavior for bedrock models that do not use `system` messages. Easily done, will have PR tomorrow (it is late by me currently)
yindo commented 2026-02-22 18:25:40 -05:00
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@dabump commented on GitHub (Oct 16, 2024):

You are a legend @timothycarambat ...will wait for new release, thanks :)

@dabump commented on GitHub (Oct 16, 2024): You are a legend @timothycarambat ...will wait for new release, thanks :)
yindo commented 2026-02-22 18:25:41 -05:00
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@timothycarambat commented on GitHub (Oct 16, 2024):

Will be live in docker image latest when this build or a future build completes:
https://github.com/Mintplex-Labs/anything-llm/actions/runs/11372556281

@timothycarambat commented on GitHub (Oct 16, 2024): Will be live in docker image `latest` when this build or a future build completes: https://github.com/Mintplex-Labs/anything-llm/actions/runs/11372556281
yindo commented 2026-02-22 18:25:41 -05:00
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@Captainnik53 commented on GitHub (Mar 24, 2025):

Guys, this is breaking again.
Model - "amazon.titan-text-express-v1"
Response - This model doesn't support system messages. Try again without a system message or use a model that supports system messages.

@Captainnik53 commented on GitHub (Mar 24, 2025): Guys, this is breaking again. Model - "amazon.titan-text-express-v1" Response - This model doesn't support system messages. Try again without a system message or use a model that supports system messages.
yindo commented 2026-02-22 18:25:41 -05:00
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@timothycarambat commented on GitHub (Mar 24, 2025):

Then you should open a new GH issue if a bug has regressed. That being said - it is legitimately hard coded to handle that model explicitly - since there is no API or way to determine this preflight

Information on how you are getting this issue would be required also (UI, API, agent, etc)

https://github.com/Mintplex-Labs/anything-llm/blob/0d1a2f06aa9a71ed8adf7191ca0c0eb0a3e8d7c6/server/utils/AiProviders/bedrock/index.js#L22

@timothycarambat commented on GitHub (Mar 24, 2025): Then you should open a new GH issue if a bug has regressed. That being said - it is legitimately hard coded to handle that model explicitly - since there is no API or way to determine this preflight Information on _how_ you are getting this issue would be required also (UI, API, agent, etc) https://github.com/Mintplex-Labs/anything-llm/blob/0d1a2f06aa9a71ed8adf7191ca0c0eb0a3e8d7c6/server/utils/AiProviders/bedrock/index.js#L22
yindo changed title from [BUG]: AWS Bedrock - This model doesn't support system messages to [GH-ISSUE #2486] [BUG]: AWS Bedrock - This model doesn't support system messages 2026-06-05 14:41:44 -04:00
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Reference: Mintplex-Labs/anything-llm#1612
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