Custom System Prompts Library: Save, Share & Version Your Prompts

The Hidden Cost of Prompt Chaos

Teams waste hours recreating prompts that already exist somewhere in a Slack thread or a colleague's notes. A centralized prompts library with version history, tagging, and sharing eliminates this waste entirely.

Building Your Library

Save any system prompt with metadata — name, description, tags, and the models it works best with. Every edit creates a new version so you can always roll back.

import Vincony from "vincony";

const client = new Vincony({ apiKey: "YOUR_API_KEY" });

// Save a system prompt
const prompt = await client.prompts.create({
  name: "Senior Code Reviewer",
  description: "Reviews code for security, performance, and maintainability",
  content: "You are a senior software engineer with 15 years of experience...",
  tags: ["code-review", "security"],
  recommended_models: ["gpt-4o", "claude-sonnet-4"]
});

// Use a saved prompt
const response = await client.chat.completions.create({
  model: "gpt-4o",
  system_prompt_id: prompt.id,
  messages: [{ role: "user", content: "Review this function:\n..." }]
});

Team Sharing & Permissions

Share prompts with your team or publish them to the community. Set permissions — read-only for some team members, edit access for prompt engineers.

Version History & Diffing

Every prompt edit is tracked. Compare versions side-by-side to understand what changed and why. Link prompt versions to A/B test results for data-driven iteration.

// Compare prompt versions
const diff = await client.prompts.diff(prompt.id, {
  version_a: 3,
  version_b: 5
});

console.log(diff.changes);  // Line-by-line diff
console.log(diff.performance_delta);  // Quality metrics comparison

Pricing

Up to 50 saved prompts on the Free plan. Unlimited prompts, team sharing, and version history on Pro and Enterprise.