Developed a new API-key-only enrollment method for the Private Action Runner in the DataDog/datadog-agent repository, enabling agents to self-enroll without requiring an application key. This feature introduced a dedicated endpoint that bypasses app_key validation when only an API key is provided, while maintaining backward compatibility for existing workflows. The implementation involved backend development in Go, with enhanced logging to clarify enrollment paths and targeted tests to validate both new and legacy behaviors. Coordinated closely with server-side teams to align endpoint dependencies and prepared the feature for staging integration, improving onboarding flexibility for users lacking an application key.