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fix(bedrock): use boto3 Session region from aws_profile instead of hardcoded us-east-1 #1236

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fix(bedrock): use boto3 Session region from aws_profile instead of hardcoded us-east-1 #1236

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7f82401
fix(bedrock): pass aws_profile to boto3.Session for region inference
giulio-leone Mar 9, 2026
2175b16
test: harden bedrock profile inference coverage
giulio-leone Mar 23, 2026
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8 changes: 4 additions & 4 deletions src/anthropic/lib/bedrock/_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ def _prepare_options(input_options: FinalRequestOptions) -> FinalRequestOptions:
return options


def _infer_region() -> str:
def _infer_region(aws_profile: str | None = None) -> str:
"""
Infer the AWS region from the environment variables or
from the boto3 session if available.
Expand All @@ -77,7 +77,7 @@ def _infer_region() -> str:
try:
import boto3

session = boto3.Session()
session = boto3.Session(profile_name=aws_profile)
if session.region_name:
aws_region = session.region_name
except ImportError:
Expand Down Expand Up @@ -161,7 +161,7 @@ def __init__(

self.aws_access_key = aws_access_key

self.aws_region = _infer_region() if aws_region is None else aws_region
self.aws_region = _infer_region(aws_profile) if aws_region is None else aws_region
self.aws_profile = aws_profile

self.aws_session_token = aws_session_token
Expand Down Expand Up @@ -303,7 +303,7 @@ def __init__(

self.aws_access_key = aws_access_key

self.aws_region = _infer_region() if aws_region is None else aws_region
self.aws_region = _infer_region(aws_profile) if aws_region is None else aws_region
self.aws_profile = aws_profile

self.aws_session_token = aws_session_token
Expand Down
55 changes: 55 additions & 0 deletions tests/lib/test_bedrock.py
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Original file line number Diff line number Diff line change
Expand Up @@ -195,3 +195,58 @@ def test_region_infer_from_specified_profile(
client = AnthropicBedrock()

assert client.aws_region == next(profile for profile in profiles if profile["name"] == aws_profile)["region"]


@pytest.mark.parametrize(
"profiles, aws_profile",
[
pytest.param(
[{"name": "default", "region": "us-east-2"}, {"name": "custom", "region": "eu-west-1"}],
"custom",
id="custom profile via constructor",
),
],
)
def test_region_infer_from_constructor_aws_profile(
mock_aws_config: None, # noqa: ARG001
profiles: t.List[AwsConfigProfile],
aws_profile: str,
monkeypatch: t.Any,
) -> None:
"""aws_profile passed to constructor should be used for region inference,
even when AWS_PROFILE env var is not set."""
monkeypatch.delenv("AWS_REGION", raising=False)
monkeypatch.delenv("AWS_DEFAULT_REGION", raising=False)
monkeypatch.delenv("AWS_PROFILE", raising=False)

client = AnthropicBedrock(aws_profile=aws_profile)

expected_region = next(p for p in profiles if p["name"] == aws_profile)["region"]
assert client.aws_region == expected_region


@pytest.mark.parametrize(
"profiles, aws_profile",
[
pytest.param(
[{"name": "default", "region": "us-east-2"}, {"name": "custom", "region": "eu-west-1"}],
"custom",
id="async custom profile via constructor",
),
],
)
def test_region_infer_from_constructor_aws_profile_async(
mock_aws_config: None, # noqa: ARG001
profiles: t.List[AwsConfigProfile],
aws_profile: str,
monkeypatch: t.Any,
) -> None:
"""AsyncAnthropicBedrock should also use constructor aws_profile for region inference."""
monkeypatch.delenv("AWS_REGION", raising=False)
monkeypatch.delenv("AWS_DEFAULT_REGION", raising=False)
monkeypatch.delenv("AWS_PROFILE", raising=False)

client = AsyncAnthropicBedrock(aws_profile=aws_profile)

expected_region = next(p for p in profiles if p["name"] == aws_profile)["region"]
assert client.aws_region == expected_region