Northern Trail Outfitters uses a custom Java application to display code coverage and test results...

The Tooling API is specifically designed for developer-centric tools that need fine-grained access to Salesforce metadata and runtime information. It exposes specialized objects like ApexCodeCoverage, ApexCodeCoverageAggregate, and ApexTestResult. These objects allow external applications to query the results of test runs and specific line-by-line coverage metrics. While the Metadata API (Option A) is used for deployments, it does not provide the same granular query access to test execution results. The Tooling API is the industry standard for integrating Salesforce into enterprise CI/CD pipelines and quality dashboards.