DBG_AGDEBUG: Enables most debug logs, which include: debugging commands received from the engine, service thread execution code path, that is when a service thread picks up a resource for running an entry point or for modification of an attribute, printing of environment variables that the agent uses, timer-related processing like sending IAmAlive messages to engine, and so on.

DBG_AGINFO: Enables debugging messages related to specific entry-point execution, including entry point exit codes, transitioning of resources between various internal-states, printing of ArgListValues before entry point invocation, values of entry-point execution related attributes like RunInContainer and PassCInfo, and so on.

DBG_AGTRACE: Enables verbose debug logging, the bulk of it being Begin and End messages for almost every function that gets called within the agent-framework, like function-tracing.