Chaibuilder

What it does

When your agent uses it

• Extending the builder UI (custom sidebar panels
• Lifecycle hooks
• Creating custom blocks
• Configuring the server

Example prompts

• “/chaibuilder”

What it can do on your machine

Read from SKILL.md and the folder at commit 56a002f. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Chaibuilder loads about 2.2k tokens when it runs. Until then it costs about 74 tokens; SKILL.md has 362 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~74

When it runs · the whole SKILL.md, loaded when a task matches

~2.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from chaibuilder/core at commit 56a002f, republished under its BSD-3-Clause licence (© chaibuilder). 362 words, ~2,202 tokens.

name

chaibuilder

description

ChaiBuilder Core extension patterns for Next.js. Use when extending the builder UI (custom sidebar panels, slots, lifecycle hooks, feature flags, block tabs, libraries), creating custom blocks, configuring the server, or implementing page rendering. Covers all top-level chaicore APIs.

// app/(public)/[[...slug]]/page.tsx
import { getChaiBuilder } from "@/chaibuilder.server";
import { RenderChaiBlocks, ChaiPageCSS, PreviewBanner } from "chaicore/render";

export default async function Page(props) {
  const slug = "/" + ((await props.params).slug?.join("/") ?? "");
  const cb = await getChaiBuilder(props);
  const { page, pageData, settings } = await cb.getPagePayload(slug);
  return (
    <>
      <ChaiPageCSS page={page} />
      <RenderChaiBlocks page={page} pageData={pageData} settings={settings} pageProps={{ slug }} />
      <PreviewBanner show={page.draft ?? false} />
    </>
  );
}

// next.config.ts
import { withChaiBuilder } from "chaicore/next";
export default withChaiBuilder({});

// chaibuilder.config.ts — plain data, no framework imports
import { buildChaiBuilderConfig } from "chaicore/server";
export const chaiConfig = buildChaiBuilderConfig({ db });

// chaibuilder.server.ts — owns auth/tenancy/draft; exports the handle entry points import
import { chaiConfig } from "@/chaibuilder.config";
import { createChaiBuilder } from "chaicore/server";
export const { getChaiBuilder } = createChaiBuilder(chaiConfig, {
  context: async ({ request }) => ({
    userId: await getUserIdFromCookies(request),
    role: "admin",
    permissions: ["*"], // omit to resolve membership from app_users instead
    draft: false,
  }),
});

// app/(builder)/api/chai/route.ts
import { getChaiBuilder } from "@/chaibuilder.server";
import { handleChaiActionRequest } from "chaicore/nextjs/server";
export async function POST(req, props) {
  const cb = await getChaiBuilder(props, req);
  return handleChaiActionRequest(req, cb.handleHttpAction);
}

import { registerChaiBlock, registerChaiBlockProps, stylesProp } from "chaicore/registry";
import type { ChaiBlockComponentProps, ChaiStyles } from "chaicore/types";

const MyBlock = ({ blockProps, styles, label }: ChaiBlockComponentProps<{ label: string; styles: ChaiStyles }>) => (
  <div {...blockProps} {...styles}>
    {label}
  </div>
);

registerChaiBlock(MyBlock, {
  type: "MyBlock",
  label: "My Block",
  group: "basic",
  props: registerChaiBlockProps({
    properties: {
      styles: stylesProp("p-4"),
      label: { type: "string", title: "Label", default: "Hello" },
    },
  }),
  i18nProps: ["label"],
  aiProps: ["label"],
});

// chai-setup.ts  ← module-level, imported once before builder mounts
import { registerChaiSlot, CHAI_SLOT_IDS, registerChaiHook, CHAI_HOOKS } from "chaicore";

registerChaiSlot(CHAI_SLOT_IDS.TOPBAR_RIGHT, MyButton);
registerChaiHook(CHAI_HOOKS.BEFORE_SAVE_PAGE, myHook);

// editor/page.tsx
"use client";
import "../chai-setup";
import { ChaiWebsiteBuilder } from "chaicore";
export default function EditorPage() {
  return <ChaiWebsiteBuilder {...props} />;
}

© chaibuilder, BSD-3-Clause. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 32 other files in .agents/skills/chaibuilder of chaibuilder/core.

• SKILL.md
• AGENTS.md
• README.md
• SKILLS.md
• metadata.json
• rules/_sections.md
• rules/_template.md
• rules/blocks-component-props.md
• rules/blocks-data-provider.md
• rules/blocks-i18n-ai.md
• rules/blocks-nesting-wrapper.md
• rules/blocks-props-schema.md
• rules/blocks-register.md
• rules/extend-ui-add-block-tab.md
• rules/extend-ui-block-settings.md
• rules/extend-ui-feature-flags.md
• rules/extend-ui-hooks.md
• rules/extend-ui-library.md
• rules/extend-ui-pre-import-html.md
• rules/extend-ui-save-to-library.md
• … and 13 more

Open the folder on GitHubat commit 56a002f