# Agent API The Agent provides some HTTP endpoints to interact with the agent itself. It's only needed for advanced use cases, like debugging, troubleshooting or for example manual extension registrations. The agent listens on port `42899` by default. ## Swagger UI & Spec The Spec is available at `http(s)://:42899/spec`. Swagger UI is available at `http(s)://:42899/swagger-ui/index.html`. ## Authentication Modifying endpoints require basic authentication. The default username is `_` with the agent-key as password. Credentials might be changed using the properties `steadybit.agent.api.auth.username` and `steadybit.agent.api.auth.password` in the agent configuration. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.steadybit.com/install-and-configure/install-agent/agent-api.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.