Injecting Resources into Prompts

The ultimate power of an MCP Prompt is assembling vast amounts of context before the conversation even starts. Inside your prompt function, you can load external Resource data.

server.prompt(
  "onboard_developer",
  {},
  async () => {
    // Dynamically assemble context
    const architecture = await fs.readFile('architecture.md');
    return {
      messages: [{
        role: "user",
        content: {
          type: "text",
          text: `Here is the team architecture: ${architecture}\n\nPlease explain the build process.`
        }
      }]
    };
  }
);

This pattern ensures the LLM is perfectly grounded with absolute truth before the user asks their first question.