antigravity-skills-reference/docs/integrations/jetski-gemini-loader/README.md

Jetski + Gemini Lazy Skill Loader (Example)

This example shows one way to integrate antigravity-awesome-skills with a Jetski/Cortex‑style agent using lazy loading based on @skill-id mentions, instead of concatenating every SKILL.md into the prompt.

This is not a production‑ready library – it is a minimal reference you can adapt to your own host/agent implementation.

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What this example demonstrates

• How to:
  • load the global manifest data/skills_index.json once at startup;
  • scan conversation messages for @skill-id patterns;
  • resolve those ids to entries in the manifest;
  • read only the corresponding SKILL.md files from disk (lazy loading);
  • build a prompt array with:
    • your base system messages;
    • one system message per selected skill;
    • the rest of the trajectory.
• How to enforce a maximum number of skills per turn via maxSkillsPerTurn.
• How to choose whether to truncate or error when too many skills are requested via overflowBehavior.

This pattern avoids context overflow when you have 1,340+ skills installed.

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Files

• loader.mjs
  • Implements:
    • loadSkillIndex(indexPath);
    • resolveSkillsFromMessages(messages, index, maxSkills);
    • loadSkillBodies(skillsRoot, metas);
    • buildModelMessages({...}).
• See also the integration guide:
  • docs/integrations/jetski-cortex.md

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Basic usage (pseudo‑code)

import path from "path";
import {
  loadSkillIndex,
  buildModelMessages,
  Message,
} from "./loader.mjs";

const REPO_ROOT = "/path/to/antigravity-awesome-skills";
const SKILLS_ROOT = REPO_ROOT;
const INDEX_PATH = path.join(REPO_ROOT, "data", "skills_index.json");

// 1. Bootstrap once at agent startup
const skillIndex = loadSkillIndex(INDEX_PATH);

// 2. Before calling the model, build messages with lazy‑loaded skills
async function runTurn(trajectory: Message[]) {
  const baseSystemMessages: Message[] = [
    {
      role: "system",
      content: "You are a helpful coding agent.",
    },
  ];

  const modelMessages = await buildModelMessages({
    baseSystemMessages,
    trajectory,
    skillIndex,
    skillsRoot: SKILLS_ROOT,
    maxSkillsPerTurn: 8,
    overflowBehavior: "error",
  });

  // 3. Pass `modelMessages` to your Jetski/Cortex + Gemini client
  // e.g. trajectoryChatConverter.convert(modelMessages)
}

Adapt the paths and model call to your environment.

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Important notes

• Do not iterate through skills/*/SKILL.md and load everything at once.
• This example:
  • assumes skills live under the same repo root as data/skills_index.json;
  • uses a plain Node.js ESM module so it can be imported directly without a TypeScript runtime.
• In a real host:
  • wire buildModelMessages into the point where you currently assemble the prompt before TrajectoryChatConverter;
  • consider overflowBehavior: "error" if you want a clear user-facing failure instead of silently dropping extra skills;
  • keep path validation so manifest entries cannot escape your configured skills root;
  • add token‑counting / truncation logic if you want a stricter safety budget.