API registry / Harness
Harness
The API reference at apidocs.harness.io offers a 'Download OpenAPI description' link (OpenAPI 3.0, /_bundle/index.yaml), but the file returned HTTP 500 on repeated attempts, so no verified URL is listed. Default server https://app.harness.io.
Apideck doesn't connect Harness yet, so its tools aren't available to your agent here. It's listed for its spec.
Harness publishes no machine-readable API spec.