Semantic application runtime · v0.5.0 beta

Give every task its own interface.

Gruntend lets models compose typed application capabilities into JavaScript plans, then interprets those plans through app-owned handlers to return data or task-specific UI.

Understand how it works →Open the demo ↗

Plans run through an explicitly selected JailJS or QuickJS/WASM executor—never host eval or host Function.

Runtime traceLive execution1 of 5

your.webapp.com

// JavaScript plan generated by the LLM from the user's intent.
const menus = await tools.menus.list({});
const itemGroups = await Promise.all(
  menus.menus.map((menu) =>
    tools.menu.items.list({ menuId: menu.menuId })
  )
);

const changes = itemGroups
  .flatMap((group, index) =>
    group.items.map((item) => ({
      ...item,
      menuName: menus.menus[index].name,
    }))
  )
  .filter(({ price }) => price < 10)
  .map((item) => ({
    ...item,
    nextPrice: item.price * 1.2,
  }));

let message = "";
const applyChanges = async () => {
  await Promise.all(changes.map((change) =>
    tools.menu.item.update({
      menuId: change.menuId,
      itemId: change.itemId,
      price: change.nextPrice,
    })
  ));
  message = `${changes.length} prices updated.`;
};

const render = () => html`<section class="price-review">
  <header>
    <div><small>Generated for this task</small><h2>Price review</h2></div>
    <b>${changes.length} items</b>
  </header>
  <div class="price-list">${changes.map((change) => html`
    <article>
      <span><strong>${change.name}</strong><small>${change.menuName}</small></span>
      <span><del>$${change.price.toFixed(2)}</del><b>$${change.nextPrice.toFixed(2)}</b></span>
    </article>
  `)}</div>
  <footer>
    <button onclick=${applyChanges}>Apply all changes</button>
    <span>${message || "No mutation until confirmation"}</span>
  </footer>
</section>`;

return render;

Generated planregistered capability boundaryApplication

tools.menus.list()→menus.list handler4 menus

tools.menu.items.list(…)→menu items handler19 items