> ## Documentation Index > Fetch the complete documentation index at: https://cometchat-22654f5b-feature-react-native-flag-and-channel.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Mastra Agents Playbook > This playbook contains guides for building six core Mastra agents: Knowledge Retrieval, Frontend Action, Backend Tool Action, Handoff, Relay, and Group Chat. # Knowledge Retrieval Agent Imagine a minimal agent that can answer questions from your docs. Build a **RAG-lite retrieval agent** with local markdown files or upgrade later to a vector DB. Build & integrate the knowledge retrieval agent. *** # Frontend Actions Agent An agent that outputs structured JSON actions (navigate, openModal, toggleTheme) which your frontend dispatcher can safely execute. Emit safe UI actions from the agent. *** # Backend Tools Agent An agent that calls backend tools or APIs. Example: fetch the weather from an external API, create tickets, update CRM. Wire backend tools & external APIs. *** # Human Handoff Agent An agent that knows its limits. If a human is required, it escalates gracefully by invoking a `handoff` tool with target + reason. Escalate to humans with context. *** # Multi-agent Orchestration (Coordinator) Agent An agent that queries multiple people, APIs, or sub-agents and returns a consolidated answer. Perfect for “Who is available tomorrow?” type queries. Fan-out across sources & merge results. *** # Group Chat Agent An agent that lives in group chats and only responds when explicitly mentioned, e.g. `@agent what’s our refund policy?`. Mention-aware agent for group rooms. *** ## Next Steps * Combine these agents in one Mastra project. * Deploy to your preferred host and connect them into **CometChat Dashboard → AI Agents**. * Extend with guardrails, vector retrieval, and advanced workflows. * Distribute this playbook internally so teams can copy-paste working agent setups. ***