> ## Documentation Index > Fetch the complete documentation index at: https://docs.verloop.io/llms.txt > Use this file to discover all available pages before exploring further. # Recipe blocks # Understanding Recipe Blocks Blocks are the fundamental units of a Verloop Recipe. Each block represents a specific step, action, or decision in your conversation flow. By connecting these blocks, you can build sophisticated **Voice AI Agents** capable of handling everything from simple FAQs to complex, multi-turn consultations. ## Block Library Verloop offers a diverse set of blocks to balance rigid control with the fluid reasoning of AI Agents. *** ### 1. Message Block The simplest way to deliver information. This block plays a pre-defined script or static text to the caller. * **Key Features:** Instant text-to-speech rendering and low-latency execution. * **What it Enables:** Greetings, legal disclaimers, or providing specific information that doesn't require user input. * **Settings:** \* **Text Content:** The exact script the agent reads. ### 2. Smart AI Block (LLM Block) The core of your advanced automation. This block leverages a **LLM** to handle open-ended, multi-turn dialogues within a specific context. * **Key Features:** Context retention across multiple exchanges, intent recognition, and entity extraction. * **What it Enables:** Handling complex workflows where the user might ask follow-up questions or go off-script. * **Settings:** \* **System Prompt:** Instructions for the **Smart AI Block** behavior. * **Conversation History:** Should the conversation block have access to historic conversations. * **Number of Turns:** Number of times a AI Agent will try to assist before exiting the block. * **Barge In:** Enable or Disable ability of caller to interrupt while the AI Agent is speaking. * **Nudge:** Nudge enables AI Agent to repeat the question in case the caller has not anwsered it. * **AnswerFlow:** Enables AI Agent to access trained information from the Knowledge Base, Website and any other information source configured. * **Speech Normalization:** Converts numbers, units, weight and other data types into natural conversation format. * **Intent and Variable Mapping:** Intent and variable to be extracted from the conversation as it proceeds within the block. * **Exit Condition:** Flow exits from the block once a Intent is matched from the configured list. * **Pro Tip:** Essential for **Voice AI Agents for Arabic** to manage complex morphological variations and regional nuances in natural conversation. * **Latency Tip:** Variable extraction from intent recognition adds to the overall call latency. ### 3. Ask Block A specialized, simplified **LLM** block designed to capture a single piece of information from the user. * **Key Features:** Built-in retry logic and specific slot-filling capabilities. * **What it Enables:** Efficient data collection (e.g., "What is your account number?"). * **Settings:** \* **System Prompt:** Instructions for the **Smart AI Block** behavior. * **Conversation History:** Should the conversation block have access to historic conversations. * **Number of Turns:** Number of times a AI Agent will try to assist before exiting the block. * **Barge In:** Enable or Disable ability of caller to interrupt while the AI Agent is speaking. * **Nudge:** Nudge enables AI Agent to repeat the question in case the caller has not anwsered it. * **AnswerFlow:** Enables AI Agent to access trained information from the Knowledge Base, Website and any other information source configured. * **Speech Normalization:** Converts numbers, units, weight and other data types into natural conversation format. * **Intent and Variable Mapping:** Intent and variable to be extracted from the conversation as it proceeds within the block. * **Exit Condition:** Flow exits from the block once a Intent is matched from the configured list. * **Pro Tip:** Essential for **Voice AI Agents for Arabic** to manage complex morphological variations and regional nuances in natural conversation. * **Latency Tip:** Variable extraction from intent recognition adds to the overall call latency. ### 4. Condition Block The brain of your routing logic. It evaluates variables and conversation data to determine the next path. * **What it Enables:** Personalized journeys. For example, routing high-value customers to a human and others to an automated flow. * **Settings:** \* **Logic Rules:** Define `IF/ELSE` conditions based on user input, existing variables or API responses. * **Variables:** Compare captured data points (e.g., `order_value > 500`). ### 5. Code Block For technical flexibility, the Code Block allows you to execute custom JavaScript snippets directly within the flow. * **Key Features:** High-speed execution of custom logic. * **What it Enables:** Data transformation, complex math, or formatting **LLM** outputs before they are spoken. * **Settings:** \* **JS Editor:** Write and test your JavaScript. * **Input/Output Mapping:** Pass variables into and out of the code environment. ### 6. API Block Integrate your **Voice AI Agent** with your tech stack in real-time. * **What it Enables:** Fetching live data (like order status) or pushing updates to your CRM during a call. * **Settings:** \* **Method:** GET, POST, PUT, DELETE. * **Configuration:** Headers, Query Params, and JSON Body. * **Mapping:** Save API response fields into Recipe variables. ### 7. Webhook Block Make standard webhook calls to external services to trigger events outside the call. * **Key Features:** Event-driven notifications. * **Settings:** Webhook URL and custom payload configuration. ### 8. Transfer Block The bridge between **Voice Agents** and human empathy. This block hands off the call to a live representative. * **What it Enables:** Escalation for complex issues or high-priority sales closures. * **Settings:** \* **Transfer Destination:** SIP URI or PSTN number. * **Transfer Message:** A bridge message played to the caller during the handoff. * **Localized Transfer:** Crucial for **Voice AI Agents for Arabic** to route calls to native-speaking support teams based on detected dialects. ### 9. Close Block The logical conclusion of a call or a specific branch of the conversation. * **What it Enables:** Professional termination of the call. * **Settings:** \* **Closing Script:** Final words before disconnect. * **Disposition:** Tag the call for reporting (e.g., "Resolved", "Inquiry"). *** ## How to Connect Blocks Select a block from the side panel and drag it onto the Recipe canvas. Start with a **Message Block** for a welcome greeting. Every block has output ports (circles on the side). Click and drag a line from an output port to the next block. * **Standard Transitions:** Follow the flow of conversation. * **Logic Transitions:** In a **Condition Block**, connect the "True" port to one block and the "False" port to another. Ensure variables are passed between blocks. For example, take the `id_number` captured in an **Ask Block** and map it into the **API Block** to pull the user's profile. Use the "Simulator" to talk to your agent. Observe how the **Smart AI** moves through the blocks and adjust your prompts or logic paths based on the real-time feedback.