Why This Matters

CloudWatch helpers are reused by AWS tools, but the service functions themselves are untested directly.

Read First

• app/services/cloudwatch_client.py
• tests/tools/test_cloudwatch_logs_tool.py

Scope

1. Add a direct test module for metric and log helper functions.
2. Mock make_boto3_client() and require_aws_credentials().
3. Keep tool-registration assertions out of this test module.

Tests / Coverage

• tests/services/test_cloudwatch_client.py
• cover get_metric_statistics()
• cover filter_log_events()
• cover get_log_events()
• cover missing boto3 and missing credentials flows

Acceptance Criteria

• CloudWatch service functions have direct tests
• no tool tests are needed to prove service behavior
• the test names make each helper's contract obvious