The RATIONALE: BE is an invitation for participation not a demand for attention. AGENT is defined in the dictionary as a person or thing that takes an active role or produces a specified effect - the doer of an action.
Agent FOR - and not of change. An important distinction - for means the agent can support change, and throughout their actions encourage change but they are not themselves the change.
Positive CHANGE in lives is the goal here. This then allows an agent to define the change they want to see or deliver and the change they can commit to.
BE an AGENT FOR CHANGE. What change do you want to see or deliver?