> ## Documentation Index > Fetch the complete documentation index at: https://docs.major.build/llms.txt > Use this file to discover all available pages before exploring further. # Agents > Reusable AI configurations that act on your data and apps. An **Agent** is a reusable AI configuration you build once and run on demand. An agent pairs a system prompt with the connectors, apps, skills, and permissions it's allowed to use — so it can autonomously query your data, interact with your apps, and take action within the boundaries you define. ## How agents run Start a chat and pick an agent, or run it without a person in the loop — on a schedule, from an app trigger, or as a Slack bot. Agent sessions can run on multiple providers (Anthropic, OpenAI, Gemini, Kimi); see [Models](/agents/models). System prompts, skills, schedules, and access control for agents.