AWS Bedrock invoke_agent function raise error when inputText is unicode, particularly Vietnamese

[TrietNguyenRenova]

Describe the bug

I tried to invoke the AWS Bedrock Agent by using boto3 package. The code snippet was really simple, but it prompted me this error botocore.exceptions.EventStreamError: An error occurred (accessDeniedException) when calling the InvokeAgent operation: Bedrock was unable to assume the specified role. Provide necessary permissions to Bedrock and retry the request.

After I changed the value of inputText parameter from Unicode to Ascii format, the issue was solved. But this was not consistent. Please refer to the snapshots samples

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

I expect it to return the response from Bedrock Agent similar to the one I tested in AWS Console

Current Behavior

Please trace back to the Describe the bug section. I included every detail log snapshot

Reproduction Steps

• Use Python version 3.10.12 in WSL2
• Packages used detail

• Codebase was captured in the above screenshot

Possible Solution

Currently I am still finding a solution because my input is plain Vietnamese. But through some sample use cases as described above, I do not think decoding the unicode value is the right solution

Additional Information/Context

No response

SDK version used

1.40.62

Environment details (OS name and version, etc.)

WSL2 in Window

[TrietNguyenRenova]

Update: I did the similar test wit AWS Bedrock console today. I simulated the exact same Bedrock Agent with the same role but the respond was not consistent throughout.

The FM model I used was Claude 3.7 Sonnet

[binhrenova]

Interesting, from boto3 API doc of invoke_agent, i found no clue related to the usage of Unicode/ASCII.

Looking forward to this!

[ihatesea69]

I got the same issue, my system is down because this problem :(

[adev-code]

Hello @TrietNguyenRenova, thank you for reaching out. I have tried to replicate and I did not get the same error. I have tried using your repro and as minimal as possible:

import boto3
import os
import uuid
import time

boto3.set_stream_logger('')

def invoke_agent(bedrock_agent_runtime, text_variant, label):
    session_id = str(uuid.uuid4())
    try:
        response = bedrock_agent_runtime.invoke_agent(
            agentId=os.environ.get("AGENT_ID"),
            agentAliasId=os.environ.get("AGENT_ALIAS_ID"),
            sessionId=session_id,
            inputText=text_variant
        )

        completion = ""
        for event in response.get("completion", []):
            if "chunk" in event:
                completion += event["chunk"]["bytes"].decode()

        print(f"✓ {label} - Success: {text_variant[:50]}... -> {completion[:100]}...")
        return completion

    except Exception as e:
        print(f"✗ {label} - Error: {text_variant[:50]}... -> {str(e)}")
        return None


def test_vietnamese_input_cases():
    session = boto3.Session()
    bedrock_agent_runtime = session.client("bedrock-agent-runtime", region_name="ap-southeast-2")

    test_cases = [
        "bạn tên là gì thế?",
        "Trại PS Xuân Tây ở đâu?",
        "Tôi muốn biết khoảng cách từ Trại PS Xuân Tây đến Trại CP Hàm Tân",
        "Khoảng cách từ trại A đến trại B là bao nhiêu?",
        "Cảm ơn bạn rất nhiều!",
        "Bạn có thể giúp tôi không?",
        "Số điện thoại của anh là gì?",
        "Thành phố Hồ Chí Minh ở đâu?"
    ]

    for text in test_cases:
        ascii_ignore = text.encode("ascii", "ignore").decode("ascii")
        ascii_simple = ''.join(c for c in text if ord(c) < 128)

        print(f"\nTesting: {text}")

        invoke_agent(bedrock_agent_runtime, text, "Raw Unicode")
        invoke_agent(bedrock_agent_runtime, ascii_ignore, "ASCII Ignore")
        invoke_agent(bedrock_agent_runtime, ascii_simple, "ASCII Simple")

        time.sleep(2)


if __name__ == "__main__":
    os.environ["AGENT_ID"] = "XXXX"
    os.environ["AGENT_ALIAS_ID"] = "XXXXX"
    test_vietnamese_input_cases()

That being said and for investigation, could you please provide full logs by adding: boto3.set_stream_logger('') after imports. But please do remove any sensitive and security information.

[github-actions]

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