libprompt Skill

When to Use

• Managing LLM system prompts as templates
• Loading prompt files from directories
• Rendering prompts with dynamic variables
• Organizing prompts for different agents

Key Concepts

PromptLoader: Loads .prompt.md files from a directory and renders them using Mustache templating syntax.

Mustache templating: Use {{variable}} syntax for dynamic content insertion.

Usage Patterns

Pattern 1: Load and render prompt

import { PromptLoader } from "@copilot-ld/libprompt";

const loader = new PromptLoader("./prompts");
const systemPrompt = await loader.render("system", {
  agentName: "Assistant",
  capabilities: ["search", "calculate"],
});

Pattern 2: Prompt file structure

<!-- prompts/system.prompt.md -->

You are {{agentName}}.

Your capabilities: {{#capabilities}}

- {{.}} {{/capabilities}}

Integration

Used by Memory service to load agent system prompts. Prompts stored in config/agents/*/prompts/.