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1. Prompt Templates2. Dynamic Arguments3. Context Assembly

Prompt Templates

📚 Prompts⏱ 7 min⭐ 90 XP

What are Prompts inside MCP?

Prompts are predefined, reusable message templates that a user can trigger in the UI. Think of them as complex "slash commands" that inject dense system instructions into the LLM.

server.prompt(
  "senior_code_reviewer",
  { language: z.string().optional() },
  ({ language }) => ({
    messages: [{
      role: "user",
      content: {
        type: "text",
        text: `Act as a Principal ${language || 'Software'} Engineer. Review the following code for memory leaks.`
      }
    }]
  })
);
💡 Key Insight: MCP Prompts are meant for the Host UI to expose to the user (e.g., clicking a button to load a complex workflow), not for the LLM to call autonomously.
🧪 Knowledge Check
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What is the main use-case for an MCP Prompt?
To force the LLM to generate faster tokens.
To provide a reusable template that users can quickly invoke via the UI.
To act as an automated testing script.
To cache data on the server.