> ## Documentation Index > Fetch the complete documentation index at: https://docs.fluents.ai/llms.txt > Use this file to discover all available pages before exploring further. # How-To: Prompt > Guide to creating the prompt for an Agent. # Prompt: Creating the Personality and Behavior of Your Agent The **Prompt** defines how your Agent communicates — its tone, responses, and behavior during interactions.\ Prompts can also include metadata from your context using variables such as `{variable_name}`. *** ## Creating a Prompt You can write a Prompt from scratch or enhance it with reusable **Blocks**. Prompt Example *** ## Using Blocks in Prompts Fluents.ai supports a modular **Block system**, allowing you to build Prompts with reusable components. A **Block** is a predefined set of instructions, context, or logic that can be inserted into a Prompt.\ Multiple Blocks can be combined in a single Prompt to simplify complex workflows. ### Examples of Blocks * **Knowledge Base Block** — Load company-specific facts or FAQs. * **Voicemail Detection Block** — Add logic for handling voicemail scenarios. * **Fallback Block** — Define responses for uncertainty or no reply. * **Compliance Block** — Insert disclaimers or consent language as required. By combining Blocks, you can create flexible and consistent Agent behavior across multiple Prompts. Block Example ### Adding a Block 1. In the interface, select the Block you want to add. 2. Choose whether you’re creating a full Prompt or a standalone Block. 3. If creating a Block, assign it a **tag** to categorize and reuse it effectively. *** ## Next Steps * Explore the API: [Create Prompt](../../api-reference/prompts/create-prompt) * Continue setup: [Agent Guide](./agent)