Add support for AWS bedrock bearer token

[arturborycki]

Could we expect to add support for AWS bedrock to use bearer token. looking at the code it is note that complicated we wold just need:

1. to have option to use os env variables
   if bearer_token is None:
   bearer_token = os.environ.get("AWS_BEARER_TOKEN_BEDROCK")
   self.bearer_token = bearer_token

2. and then add header part with:
   if self.bearer_token:
   request.headers["Authorization"] = f"Bearer {self.bearer_token}"
   return

It would be interesting to see if others see similar need?

[xXMrNidaXx]

AWS Bedrock bearer token support! At RevolutionAI (https://revolutionai.io) we use Claude via Bedrock.

Current workaround:

import boto3
from anthropic import AnthropicBedrock

# Get temporary credentials
sts = boto3.client("sts")
creds = sts.assume_role(
    RoleArn="arn:aws:iam::...",
    RoleSessionName="claude-session"
)["Credentials"]

client = AnthropicBedrock(
    aws_access_key=creds["AccessKeyId"],
    aws_secret_key=creds["SecretAccessKey"],
    aws_session_token=creds["SessionToken"],
    aws_region="us-east-1"
)

What we want:

# Direct bearer token support
client = AnthropicBedrock(
    aws_bearer_token="...",
    aws_region="us-east-1"
)

Use cases:

• Lambda with IAM roles
• EKS service accounts
• Cross-account access

Would simplify serverless deployments!