System Prompts Explained | CodeSignal Learn

System Prompts Explained | CodeSignal Learn

Introduction: Understanding System Prompts

In the previous lesson, you learned how to make your prompts more effective by using clear instructions and positive reinforcement. Now, let's take a step further and talk about a special type of prompt called a system prompt . A system prompt is a message that sets the rules or context for how a language model should behave during a conversation. Unlike regular prompts, which are usually questions or requests from the user, system prompts act as instructions for the model itself. They help define the model's role, tone, or personality for the entire session. For example, if you want the model to act like a helpful assistant, you can set a system prompt that tells it to do so. This is especially useful in chat platforms like CosmoCPT, where you might want the model to stay in character or follow specific guidelines throughout the conversation.

Why Use System Prompts?

System prompts are necessary because they guide the model's behavior from the very beginning. They help you: Set the model's role (e.g., a teacher, a cat, an IT specialist) Control the tone and style of responses Limit or expand what the model can talk about By using system prompts, you can ensure the model consistently follows your desired guidelines throughout the entire conversation.

Example

Let's look at a real-world example. Imagine you are building a customer support chatbot. You want the chatbot to always be polite and only answer questions related to your product. By setting a system prompt like: text You are a polite customer support agent. Only answer questions about our product. The model will try to follow these instructions in every response. System prompts are also helpful for creative tasks. For example, if you want the model to write stories as if it were a pirate, you can set a system prompt to make it talk like one.

System Prompts in CosmoCPT

In the practices on our platform, you can set the system prompt in CosmoCPT (the chat UI is labeled ChatCPT) in the following way: Open Settings in the sidebar. Enter your system prompt in the "Response Preferences" input field. That's it! When you click the Apply & New Chat button, the system prompt will be applied to your next prompt.

Sign up

Join the 1M+ learners on CodeSignal

Be a part of our community of 1M+ users who develop and demonstrate their skills on CodeSignal

More Examples of System Prompts

Here are three different ways you can use system prompts to guide a language model's behavior: Limiting the Scope of Conversation Only answer questions related to healthy eating and nutrition. Politely decline to discuss any other topics. Enforcing a Specific Output Format When answering, always provide your response in a numbered list, with each point being one sentence long. Controlling the Level of Detail Give concise, one-sentence answers suitable for young children, avoiding technical jargon or complex explanations.