diff --git a/.changeset/empty-a2ui-cli-prompt.md b/.changeset/empty-a2ui-cli-prompt.md
new file mode 100644
index 0000000000..e4907d82cd
--- /dev/null
+++ b/.changeset/empty-a2ui-cli-prompt.md
@@ -0,0 +1,5 @@
+---
+
+---
+
+No package release is required because this change wires A2UI prompt/catalog generation tooling for the GenUI workspace without changing published runtime behavior.
diff --git a/biome.jsonc b/biome.jsonc
index 76db89d25f..2e95caf670 100644
--- a/biome.jsonc
+++ b/biome.jsonc
@@ -62,6 +62,8 @@
 
       // REPL examples use Lynx platform globals and are not subject to lint rules
       "packages/repl/src/examples/**",
+      // REPL generated artifacts can exceed Biome's file-size limit
+      "packages/repl/src/generated/**",
     ],
     "rules": {
       // We are migrating from ESLint to Biome
diff --git a/packages/genui/a2ui-catalog-extractor/README.md b/packages/genui/a2ui-catalog-extractor/README.md
index 50bf7f04e0..bea6083197 100644
--- a/packages/genui/a2ui-catalog-extractor/README.md
+++ b/packages/genui/a2ui-catalog-extractor/README.md
@@ -38,6 +38,7 @@ It can also wrap those generated components with a `catalogId`,
 - It does not ask you to write JSON Schema in comments.
 - It does not expand arbitrary imported type aliases or external
   interfaces.
+- It does not call an LLM or choose a model.
 
 The package consumes TypeDoc reflection data. This keeps the implementation
 small, but it also means catalog-facing shapes should be written inline in
@@ -53,7 +54,7 @@ the marked interface.
 
 ### Package manager
 
-Install it as a development dependency:
+Install the extractor as a development dependency:
 
 ```bash
 pnpm add -D @lynx-js/a2ui-catalog-extractor
@@ -385,8 +386,16 @@ export interface CardProps {
 
 ## CLI Reference
 
+The package exposes the standalone `a2ui-catalog-extractor` binary. The
+separate `@lynx-js/a2ui-cli` package also exposes this flow as
+`a2ui-cli generate catalog`.
+
+### Generate catalog artifacts
+
 ```bash
 a2ui-catalog-extractor [options]
+# or
+a2ui-cli generate catalog [options]
 ```
 
 | Option                  | Description                                                                  | Default        |
diff --git a/packages/genui/a2ui-catalog-extractor/package.json b/packages/genui/a2ui-catalog-extractor/package.json
index 57c077df57..b4a7ecb07d 100644
--- a/packages/genui/a2ui-catalog-extractor/package.json
+++ b/packages/genui/a2ui-catalog-extractor/package.json
@@ -1,8 +1,12 @@
 {
   "name": "@lynx-js/a2ui-catalog-extractor",
   "version": "0.0.0",
-  "private": true,
   "description": "TypeDoc-driven A2UI catalog extractor for TypeScript interfaces.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/lynx-family/lynx-stack.git",
+    "directory": "packages/genui/a2ui-catalog-extractor"
+  },
   "license": "Apache-2.0",
   "type": "module",
   "exports": {
@@ -10,6 +14,10 @@
       "types": "./dist/index.d.ts",
       "default": "./dist/index.js"
     },
+    "./cli": {
+      "types": "./dist/cli.d.ts",
+      "default": "./dist/cli.js"
+    },
     "./skill": "./skills/a2ui-catalog-extractor/SKILL.md",
     "./package.json": "./package.json"
   },
diff --git a/packages/genui/a2ui-catalog-extractor/readme.zh_cn.md b/packages/genui/a2ui-catalog-extractor/readme.zh_cn.md
index 314874d32e..a2ade3aac2 100644
--- a/packages/genui/a2ui-catalog-extractor/readme.zh_cn.md
+++ b/packages/genui/a2ui-catalog-extractor/readme.zh_cn.md
@@ -36,6 +36,7 @@ agent 哪些 props 合法、哪些 props 必填、哪些 enum 值可用，以及
 - 它不直接使用 TypeScript compiler API。
 - 它不要求你在注释里写 JSON Schema。
 - 它不会展开任意导入的 type alias 或外部 interface。
+- 它不会调用 LLM，也不会替你选择模型。
 
 这个包消费 TypeDoc reflection 数据。这样实现更小，但也意味着面向 catalog
 的类型形状应该直接内联写在被标记的 interface 中。
@@ -50,7 +51,7 @@ agent 哪些 props 合法、哪些 props 必填、哪些 enum 值可用，以及
 
 ### 包管理器
 
-把它安装为开发依赖：
+把 extractor 安装为开发依赖：
 
 ```bash
 pnpm add -D @lynx-js/a2ui-catalog-extractor
@@ -377,8 +378,16 @@ export interface CardProps {
 
 ## CLI 参考
 
+这个包暴露独立的 `a2ui-catalog-extractor` binary。单独的
+`@lynx-js/a2ui-cli` 包也把这个流程暴露为
+`a2ui-cli generate catalog`。
+
+### 生成 catalog artifacts
+
 ```bash
 a2ui-catalog-extractor [options]
+# 或
+a2ui-cli generate catalog [options]
 ```
 
 | 选项                    | 说明                                                           | 默认值         |
diff --git a/packages/genui/a2ui-catalog-extractor/src/cli.ts b/packages/genui/a2ui-catalog-extractor/src/cli.ts
index 32834b58fe..1d12f59a25 100644
--- a/packages/genui/a2ui-catalog-extractor/src/cli.ts
+++ b/packages/genui/a2ui-catalog-extractor/src/cli.ts
@@ -34,9 +34,9 @@ Options:
   --typedoc-json <file>
                        Read an existing TypeDoc JSON project instead of
                        running TypeDoc conversion.
-  --out-dir <dir>     Output directory for component catalog.json files.
-  --version           Print the package version.
-  --help              Print this help message.
+  --out-dir <dir>      Output directory for component catalog.json files.
+  --version            Print the package version.
+  --help               Print this help message.
 
 Defaults:
   --catalog-dir src/catalog
@@ -55,6 +55,8 @@ export function parseCliArgs(args: string[]): CliOptions {
   for (let index = 0; index < args.length; index += 1) {
     const arg = args[index]!;
     switch (arg) {
+      case 'catalog-extractor':
+        break;
       case '--catalog-dir':
         options.catalogDirs.push(readValue(args, ++index, arg));
         break;
diff --git a/packages/genui/a2ui-cli/AGENTS.md b/packages/genui/a2ui-cli/AGENTS.md
new file mode 100644
index 0000000000..ab6dc09ada
--- /dev/null
+++ b/packages/genui/a2ui-cli/AGENTS.md
@@ -0,0 +1,23 @@
+# a2ui-cli
+
+Keep this package as the single public CLI entry point for A2UI setup. It should
+orchestrate other packages instead of implementing catalog extraction or prompt
+construction itself.
+
+`generate catalog` should delegate to `@lynx-js/a2ui-catalog-extractor`.
+`generate prompt` should delegate to `@lynx-js/a2ui-prompt`.
+
+Do not require users to pass `--catalog-dir` for the common prompt path. A prompt
+without `--catalog-dir` should use the built-in A2UI basic catalog from
+`@lynx-js/a2ui-prompt`; use `--catalog-dir` only for custom generated catalog
+artifacts.
+
+When `--catalog-dir` is provided, empty catalog directories should fail clearly
+instead of producing a prompt with an empty component catalog.
+
+The executable file is `bin/cli.js`; keep `package.json` `bin.a2ui-cli` pointed
+at that path.
+
+When testing local CLI changes, run the bin directly with Node. If testing
+changes in `@lynx-js/a2ui-prompt`, rebuild that package first because this CLI
+imports it through package exports.
diff --git a/packages/genui/a2ui-cli/README.md b/packages/genui/a2ui-cli/README.md
new file mode 100644
index 0000000000..de2326f905
--- /dev/null
+++ b/packages/genui/a2ui-cli/README.md
@@ -0,0 +1,65 @@
+# A2UI CLI
+
+`@lynx-js/a2ui-cli` provides one command line entry point for A2UI agent setup.
+It can generate catalog artifacts from TypeScript catalog definitions and build
+a system prompt for an A2UI generation agent.
+
+## Usage
+
+Generate a system prompt with the built-in A2UI basic catalog:
+
+```bash
+npx @lynx-js/a2ui-cli@latest generate prompt --out dist/a2ui-system-prompt.txt
+```
+
+Generate catalog artifacts for a custom catalog:
+
+```bash
+npx @lynx-js/a2ui-cli@latest generate catalog \
+  --catalog-dir src/catalog \
+  --source src/functions \
+  --out-dir dist/catalog
+```
+
+Generate a system prompt for a custom catalog:
+
+```bash
+npx @lynx-js/a2ui-cli@latest generate prompt \
+  --catalog-dir dist/catalog \
+  --catalog-id https://example.com/catalogs/custom/v1/catalog.json \
+  --out dist/a2ui-system-prompt.txt
+```
+
+`generate prompt` uses the built-in A2UI basic catalog by default. Pass
+`--catalog-dir` only when generating a prompt for custom generated catalog
+artifacts. When `--catalog-dir` is provided, the directory must contain files
+like `<Component>/catalog.json`.
+
+## Commands
+
+### `generate catalog`
+
+Delegates catalog extraction to `@lynx-js/a2ui-catalog-extractor`.
+
+Useful options:
+
+- `--catalog-dir <dir>`: directory to scan for TypeScript component catalog
+  interfaces. Defaults to `src/catalog`.
+- `--source <path>`: source file or directory to scan for catalog functions.
+  Repeatable.
+- `--typedoc-json <file>`: read an existing TypeDoc JSON project.
+- `--out-dir <dir>`: output directory for generated catalog artifacts. Defaults
+  to `dist/catalog`.
+
+### `generate prompt`
+
+Delegates prompt construction to `@lynx-js/a2ui-prompt`.
+
+Useful options:
+
+- `--catalog-dir <dir>`: generated catalog artifact directory. Omit this option
+  to use the built-in A2UI basic catalog.
+- `--catalog-id <id>`: catalog id to require in `createSurface` messages.
+  Defaults to the built-in A2UI basic catalog id.
+- `--out <file>`: write the prompt to a file instead of stdout.
+- `--appendix <text>`: append extra instructions to the generated prompt.
diff --git a/packages/genui/a2ui-cli/bin/cli.js b/packages/genui/a2ui-cli/bin/cli.js
new file mode 100755
index 0000000000..4b233ecae0
--- /dev/null
+++ b/packages/genui/a2ui-cli/bin/cli.js
@@ -0,0 +1,197 @@
+#!/usr/bin/env node
+// Copyright 2026 The Lynx Authors. All rights reserved.
+// Licensed under the Apache License Version 2.0 that can be found in the
+// LICENSE file in the root directory of this source tree.
+import * as fs from 'node:fs';
+import { createRequire } from 'node:module';
+import * as path from 'node:path';
+
+const usage = `Usage: a2ui-cli generate <target> [options]
+
+Targets:
+  catalog  Generate A2UI component and function catalog files.
+  prompt   Generate an A2UI system prompt from catalog files.
+`;
+
+const generateCatalogUsage = `Usage: a2ui-cli generate catalog [options]
+
+Options:
+  --catalog-dir <dir>  Directory to scan for TypeScript catalog interfaces.
+  --source <path>      Source file or directory to scan. Repeatable.
+  --typedoc-json <file>
+                       Read an existing TypeDoc JSON project instead of
+                       running TypeDoc conversion.
+  --out-dir <dir>      Output directory for component catalog.json files.
+  --version            Print the package version.
+  --help               Print this help message.
+
+Defaults:
+  --catalog-dir src/catalog
+  --out-dir dist/catalog
+`;
+
+const generatePromptUsage = `Usage: a2ui-cli generate prompt [options]
+
+Options:
+  --catalog-dir <dir>  Directory containing generated catalog files. When
+                       omitted, use the built-in A2UI basic catalog.
+  --catalog-id <id>    Catalog id to require in createSurface messages.
+  --out <file>         Write the prompt to a file instead of stdout.
+  --appendix <text>    Append extra instructions to the generated prompt.
+  --version            Print the package version.
+  --help               Print this help message.
+
+Defaults:
+  --catalog-id built-in A2UI basic catalog id
+`;
+
+try {
+  process.exitCode = await runCli(process.argv.slice(2));
+} catch (error) {
+  console.error(error instanceof Error ? error.message : String(error));
+  process.exitCode = 1;
+}
+
+async function runCli(args, cwd = process.cwd()) {
+  const command = args[0];
+  if (command === undefined || command === '--help' || command === '-h') {
+    console.info(usage);
+    return 0;
+  }
+  if (command === '--version' || command === '-v') {
+    printPackageVersion();
+    return 0;
+  }
+  if (command !== 'generate') {
+    throw new Error(`Unknown command: ${command}`);
+  }
+
+  const target = args[1];
+  const targetArgs = args.slice(2);
+  if (target === undefined || target === '--help' || target === '-h') {
+    console.info(usage);
+    return 0;
+  }
+  if (target === '--version' || target === '-v') {
+    printPackageVersion();
+    return 0;
+  }
+  if (target === 'catalog') {
+    if (targetArgs.includes('--help') || targetArgs.includes('-h')) {
+      console.info(generateCatalogUsage);
+      return 0;
+    }
+    const { runCli: runCatalogExtractorCli } = await import(
+      '@lynx-js/a2ui-catalog-extractor/cli'
+    );
+    return await runCatalogExtractorCli(targetArgs, cwd);
+  }
+  if (target === 'prompt') {
+    return runGeneratePromptCli(targetArgs, cwd);
+  }
+  throw new Error(`Unknown generate target: ${target}`);
+}
+
+async function runGeneratePromptCli(args, cwd = process.cwd()) {
+  const options = parseGeneratePromptArgs(args);
+  if (options.help) {
+    console.info(generatePromptUsage);
+    return 0;
+  }
+  if (options.version) {
+    printPackageVersion();
+    return 0;
+  }
+
+  const {
+    BASIC_CATALOG,
+    BASIC_CATALOG_ID,
+    buildA2UISystemPrompt,
+    readA2UICatalogFromDirectory,
+  } = await import('@lynx-js/a2ui-prompt');
+  const catalog = options.catalogDir
+    ? readA2UICatalogFromDirectory({
+      catalogDir: options.catalogDir,
+      catalogId: options.catalogId ?? BASIC_CATALOG_ID,
+      cwd,
+    })
+    : (options.catalogId
+      ? { ...BASIC_CATALOG, id: options.catalogId }
+      : undefined);
+  if (options.catalogDir && catalog && isEmptyCatalog(catalog)) {
+    throw new Error(
+      `[a2ui-cli] No components or functions found in generated catalog directory: ${options.catalogDir}`,
+    );
+  }
+  const systemPrompt = buildA2UISystemPrompt({
+    ...(catalog ? { catalog } : {}),
+    ...(options.appendix ? { appendix: options.appendix } : {}),
+  });
+
+  if (options.out) {
+    const outPath = path.resolve(cwd, options.out);
+    fs.mkdirSync(path.dirname(outPath), { recursive: true });
+    fs.writeFileSync(outPath, systemPrompt);
+    console.info(`Generated A2UI system prompt at ${options.out}.`);
+  } else {
+    process.stdout.write(systemPrompt);
+  }
+
+  return 0;
+}
+
+function parseGeneratePromptArgs(args) {
+  const options = {
+    help: false,
+    version: false,
+  };
+
+  for (let index = 0; index < args.length; index += 1) {
+    const arg = args[index];
+    switch (arg) {
+      case '--catalog-dir':
+        options.catalogDir = readValue(args, ++index, arg);
+        break;
+      case '--catalog-id':
+        options.catalogId = readValue(args, ++index, arg);
+        break;
+      case '--out':
+        options.out = readValue(args, ++index, arg);
+        break;
+      case '--appendix':
+        options.appendix = readValue(args, ++index, arg);
+        break;
+      case '--help':
+      case '-h':
+        options.help = true;
+        break;
+      case '--version':
+      case '-v':
+        options.version = true;
+        break;
+      default:
+        throw new Error(`Unknown option: ${arg}`);
+    }
+  }
+
+  return options;
+}
+
+function isEmptyCatalog(catalog) {
+  return (!Array.isArray(catalog.components) || catalog.components.length === 0)
+    && (!Array.isArray(catalog.functions) || catalog.functions.length === 0);
+}
+
+function readValue(args, index, option) {
+  const value = args[index];
+  if (!value || value.startsWith('-')) {
+    throw new Error(`Missing value for ${option}.`);
+  }
+  return value;
+}
+
+function printPackageVersion() {
+  const require = createRequire(import.meta.url);
+  const packageJson = require('../package.json');
+  console.info(packageJson.version);
+}
diff --git a/packages/genui/a2ui-cli/package.json b/packages/genui/a2ui-cli/package.json
new file mode 100644
index 0000000000..671a72ae50
--- /dev/null
+++ b/packages/genui/a2ui-cli/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "@lynx-js/a2ui-cli",
+  "version": "0.0.0",
+  "description": "CLI for generating A2UI catalog artifacts and system prompts.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/lynx-family/lynx-stack.git",
+    "directory": "packages/genui/a2ui-cli"
+  },
+  "license": "Apache-2.0",
+  "type": "module",
+  "bin": {
+    "a2ui-cli": "./bin/cli.js"
+  },
+  "files": [
+    "bin",
+    "README.md"
+  ],
+  "dependencies": {
+    "@lynx-js/a2ui-catalog-extractor": "workspace:*",
+    "@lynx-js/a2ui-prompt": "workspace:*"
+  },
+  "engines": {
+    "node": ">=22"
+  }
+}
diff --git a/packages/genui/a2ui-prompt/AGENTS.md b/packages/genui/a2ui-prompt/AGENTS.md
new file mode 100644
index 0000000000..8a1c32d111
--- /dev/null
+++ b/packages/genui/a2ui-prompt/AGENTS.md
@@ -0,0 +1,21 @@
+# a2ui-prompt
+
+Keep `packages/genui/server/agent` as the source of truth for built-in A2UI
+prompt and catalog logic. Do not copy the built-in catalog JSON, prompt text, or
+example definitions into this package.
+
+This package may contain thin package-specific adapters such as
+`readA2UICatalogFromDirectory`, but shared prompt rendering and built-in catalog
+behavior should live in the server agent source and be re-exported from here.
+
+The server package must remain self-contained for package-root Vercel
+deployments. Do not make `packages/genui/server` depend on `@lynx-js/a2ui-prompt`
+at runtime.
+
+When editing exported functions or constants reachable through this package,
+remember that `isolatedDeclarations` requires explicit types for exported APIs.
+
+Run `pnpm -C packages/genui/a2ui-prompt build` after changing server agent
+prompt/catalog sources or this package's adapter code. The CLI imports this
+package through its published exports, so local CLI tests may need this build
+step before changes are visible.
diff --git a/packages/genui/a2ui-prompt/README.md b/packages/genui/a2ui-prompt/README.md
new file mode 100644
index 0000000000..467676692a
--- /dev/null
+++ b/packages/genui/a2ui-prompt/README.md
@@ -0,0 +1,65 @@
+# A2UI Prompt
+
+`@lynx-js/a2ui-prompt` provides A2UI system prompt construction utilities for
+CLI and backend usage.
+
+The source of truth for the built-in prompt and catalog is
+`packages/genui/server/agent`. This package re-exports and bundles those server
+agent sources for publishing, so the server package stays self-contained for
+package-root deployments while CLI users can still install a standalone prompt
+package.
+
+## Usage
+
+Build a prompt with the built-in A2UI basic catalog:
+
+```ts
+import { buildA2UISystemPrompt } from '@lynx-js/a2ui-prompt';
+
+const prompt = buildA2UISystemPrompt();
+```
+
+Read generated catalog artifacts and build a prompt for a custom catalog:
+
+```ts
+import {
+  buildA2UISystemPrompt,
+  readA2UICatalogFromDirectory,
+} from '@lynx-js/a2ui-prompt';
+
+const catalog = readA2UICatalogFromDirectory({
+  catalogDir: 'dist/catalog',
+  catalogId: 'https://example.com/catalogs/custom/v1/catalog.json',
+});
+
+const prompt = buildA2UISystemPrompt({ catalog });
+```
+
+`readA2UICatalogFromDirectory` expects generated files such as
+`<Component>/catalog.json` and optional function definitions under `functions/`.
+Use `@lynx-js/a2ui-cli generate catalog` or
+`@lynx-js/a2ui-catalog-extractor` to create those artifacts.
+
+## Exports
+
+- `buildA2UISystemPrompt`
+- `A2UI_SYSTEM_PROMPT`
+- `BASIC_CATALOG`
+- `BASIC_CATALOG_ID`
+- `renderCatalogReference`
+- `createA2UICatalogFromManifests`
+- `readA2UICatalogFromDirectory`
+
+## Local Development
+
+Build the publishable bundle:
+
+```bash
+pnpm -C packages/genui/a2ui-prompt build
+```
+
+Run the package type check:
+
+```bash
+pnpm -C packages/genui/a2ui-prompt exec tsc -p tsconfig.json --noEmit
+```
diff --git a/packages/genui/a2ui-prompt/package.json b/packages/genui/a2ui-prompt/package.json
new file mode 100644
index 0000000000..8a0994f2b6
--- /dev/null
+++ b/packages/genui/a2ui-prompt/package.json
@@ -0,0 +1,32 @@
+{
+  "name": "@lynx-js/a2ui-prompt",
+  "version": "0.0.0",
+  "description": "A2UI prompt and catalog rendering utilities for CLI prompt generation.",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/lynx-family/lynx-stack.git",
+    "directory": "packages/genui/a2ui-prompt"
+  },
+  "license": "Apache-2.0",
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "default": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "build": "rslib build"
+  },
+  "devDependencies": {
+    "@types/node": "^24.10.13"
+  },
+  "engines": {
+    "node": ">=22"
+  }
+}
diff --git a/packages/genui/a2ui-prompt/rslib.config.ts b/packages/genui/a2ui-prompt/rslib.config.ts
new file mode 100644
index 0000000000..45f478c40b
--- /dev/null
+++ b/packages/genui/a2ui-prompt/rslib.config.ts
@@ -0,0 +1,19 @@
+// Copyright 2026 The Lynx Authors. All rights reserved.
+// Licensed under the Apache License Version 2.0 that can be found in the
+// LICENSE file in the root directory of this source tree.
+import type { RslibConfig } from '@rslib/core';
+import { defineConfig } from '@rslib/core';
+
+const config: RslibConfig = defineConfig({
+  lib: [
+    { format: 'esm', syntax: 'es2022', dts: { bundle: true, tsgo: true } },
+  ],
+  source: {
+    entry: {
+      index: './src/index.ts',
+    },
+    tsconfigPath: './tsconfig.build.json',
+  },
+});
+
+export default config;
diff --git a/packages/genui/a2ui-prompt/src/index.ts b/packages/genui/a2ui-prompt/src/index.ts
new file mode 100644
index 0000000000..77b5d3005c
--- /dev/null
+++ b/packages/genui/a2ui-prompt/src/index.ts
@@ -0,0 +1,146 @@
+// Copyright 2026 The Lynx Authors. All rights reserved.
+// Licensed under the Apache License Version 2.0 that can be found in the
+// LICENSE file in the root directory of this source tree.
+
+import * as fs from 'node:fs';
+import * as path from 'node:path';
+
+import {
+  createA2UICatalogFromManifests,
+} from '../../server/agent/a2ui-catalog.js';
+import type {
+  A2UICatalog,
+  A2UIFunctionSpec,
+  JsonSchema,
+} from '../../server/agent/a2ui-catalog.js';
+
+export * from '../../server/agent/a2ui-catalog.js';
+export * from '../../server/agent/a2ui-examples.js';
+export * from '../../server/agent/a2ui-prompt.js';
+
+export interface ReadA2UICatalogDirectoryOptions {
+  catalogDir: string;
+  catalogId: string;
+  cwd?: string;
+  label?: string;
+  version?: string;
+}
+
+export function readA2UICatalogFromDirectory(
+  options: ReadA2UICatalogDirectoryOptions,
+): A2UICatalog {
+  const cwd = options.cwd ? path.resolve(options.cwd) : process.cwd();
+  const catalogDir = path.resolve(cwd, options.catalogDir);
+  if (!fs.existsSync(catalogDir)) {
+    throw new Error(
+      `[a2ui-prompt] Catalog directory does not exist: ${options.catalogDir}`,
+    );
+  }
+  if (!fs.statSync(catalogDir).isDirectory()) {
+    throw new Error(
+      `[a2ui-prompt] Catalog path is not a directory: ${options.catalogDir}`,
+    );
+  }
+
+  const componentManifests: Record<string, JsonSchema>[] = [];
+  for (const entry of fs.readdirSync(catalogDir, { withFileTypes: true })) {
+    if (!entry.isDirectory() || entry.name === 'functions') {
+      continue;
+    }
+    const catalogJsonPath = path.join(catalogDir, entry.name, 'catalog.json');
+    if (fs.existsSync(catalogJsonPath)) {
+      componentManifests.push(readCatalogManifest(catalogJsonPath));
+    }
+  }
+  if (componentManifests.length === 0) {
+    throw new Error(
+      `[a2ui-prompt] No component catalog files found in ${options.catalogDir}. Expected files like <Component>/catalog.json. Run "a2ui-cli generate catalog" first or pass --catalog-dir to the generated catalog directory.`,
+    );
+  }
+
+  return createA2UICatalogFromManifests({
+    catalogId: options.catalogId,
+    componentManifests,
+    functions: readFunctionDefinitions(catalogDir),
+    ...(options.label ? { label: options.label } : {}),
+    ...(options.version ? { version: options.version } : {}),
+  });
+}
+
+function readFunctionDefinitions(catalogDir: string): A2UIFunctionSpec[] {
+  const functionsDir = path.join(catalogDir, 'functions');
+  if (!fs.existsSync(functionsDir)) {
+    return [];
+  }
+  if (!fs.statSync(functionsDir).isDirectory()) {
+    throw new Error(
+      `[a2ui-prompt] Expected functions directory at ${functionsDir}.`,
+    );
+  }
+
+  const functions: A2UIFunctionSpec[] = [];
+  for (const entry of fs.readdirSync(functionsDir, { withFileTypes: true })) {
+    if (!entry.isFile() || !entry.name.endsWith('.json')) {
+      continue;
+    }
+    const functionRecord = readJsonObject(path.join(functionsDir, entry.name));
+    for (const [name, value] of Object.entries(functionRecord)) {
+      if (!isRecord(value)) {
+        continue;
+      }
+      const description = value['description'];
+      const parameters = value['parameters'];
+      const returnType = value['returnType'];
+      functions.push({
+        name,
+        ...(typeof description === 'string' ? { description } : {}),
+        parameters: isRecord(parameters)
+          ? parameters as JsonSchema
+          : { type: 'object', properties: {}, additionalProperties: false },
+        returnType: isReturnType(returnType) ? returnType : 'any',
+      });
+    }
+  }
+
+  return functions.sort((left, right) => left.name.localeCompare(right.name));
+}
+
+function readJsonObject(filePath: string): Record<string, unknown> {
+  const value = JSON.parse(fs.readFileSync(filePath, 'utf8')) as unknown;
+  if (!isRecord(value)) {
+    throw new Error(`[a2ui-prompt] Expected JSON object in ${filePath}.`);
+  }
+  return value;
+}
+
+function readCatalogManifest(filePath: string): Record<string, JsonSchema> {
+  const manifest = readJsonObject(filePath);
+  const keys = Object.keys(manifest);
+  if (keys.length !== 1) {
+    throw new Error(
+      `[a2ui-prompt] Expected exactly one component manifest in ${filePath}, found ${keys.length}.`,
+    );
+  }
+  const componentName = keys[0]!;
+  const schema = manifest[componentName];
+  if (!isRecord(schema)) {
+    throw new Error(
+      `[a2ui-prompt] Expected JSON schema object for ${componentName} in ${filePath}.`,
+    );
+  }
+  return { [componentName]: schema as JsonSchema };
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return value !== null && typeof value === 'object' && !Array.isArray(value);
+}
+
+function isReturnType(value: unknown): value is A2UIFunctionSpec['returnType'] {
+  return value === 'string'
+    || value === 'number'
+    || value === 'boolean'
+    || value === 'array'
+    || value === 'object'
+    || value === 'any'
+    || value === 'void';
+}
diff --git a/packages/genui/a2ui-prompt/tsconfig.build.json b/packages/genui/a2ui-prompt/tsconfig.build.json
new file mode 100644
index 0000000000..fed4574d75
--- /dev/null
+++ b/packages/genui/a2ui-prompt/tsconfig.build.json
@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig.json",
+  "include": [
+    "src",
+    "../server/agent/a2ui-catalog.ts",
+    "../server/agent/a2ui-examples.ts",
+    "../server/agent/a2ui-prompt.ts",
+    "../server/agent/catalog/**/*.json",
+  ],
+}
diff --git a/packages/genui/a2ui-prompt/tsconfig.json b/packages/genui/a2ui-prompt/tsconfig.json
new file mode 100644
index 0000000000..9c53a55a0d
--- /dev/null
+++ b/packages/genui/a2ui-prompt/tsconfig.json
@@ -0,0 +1,22 @@
+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": {
+    "composite": true,
+    "rootDir": "..",
+    "noEmit": true,
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "Bundler",
+    "lib": ["ES2022"],
+    "types": ["node"],
+  },
+  "include": [
+    "src",
+    "rslib.config.ts",
+    "../server/agent/a2ui-catalog.ts",
+    "../server/agent/a2ui-examples.ts",
+    "../server/agent/a2ui-prompt.ts",
+    "../server/agent/catalog/**/*.json",
+  ],
+  "references": [],
+}
diff --git a/packages/genui/a2ui-prompt/turbo.json b/packages/genui/a2ui-prompt/turbo.json
new file mode 100644
index 0000000000..fa17b63f01
--- /dev/null
+++ b/packages/genui/a2ui-prompt/turbo.json
@@ -0,0 +1,27 @@
+{
+  "$schema": "https://turbo.build/schema.json",
+  "extends": [
+    "//"
+  ],
+  "tasks": {
+    "build": {
+      "dependsOn": [
+        "^build"
+      ],
+      "inputs": [
+        "src/**",
+        "../server/agent/a2ui-catalog.ts",
+        "../server/agent/a2ui-examples.ts",
+        "../server/agent/a2ui-prompt.ts",
+        "../server/agent/catalog/**/*.json",
+        "package.json",
+        "rslib.config.ts",
+        "tsconfig.build.json",
+        "tsconfig.json"
+      ],
+      "outputs": [
+        "dist/**"
+      ]
+    }
+  }
+}
diff --git a/packages/genui/a2ui/package.json b/packages/genui/a2ui/package.json
index c9a3e6a442..77b00ca983 100644
--- a/packages/genui/a2ui/package.json
+++ b/packages/genui/a2ui/package.json
@@ -123,7 +123,7 @@
   "types": "./dist/index.d.ts",
   "scripts": {
     "build": "tsc --project tsconfig.build.json && npm run build:catalog",
-    "build:catalog": "a2ui-catalog-extractor --catalog-dir src/catalog --out-dir dist/catalog",
+    "build:catalog": "a2ui-cli generate catalog --catalog-dir src/catalog --out-dir dist/catalog",
     "test": "rstest"
   },
   "dependencies": {
@@ -131,7 +131,7 @@
     "@preact/signals": "^2.5.1"
   },
   "devDependencies": {
-    "@lynx-js/a2ui-catalog-extractor": "workspace:*",
+    "@lynx-js/a2ui-cli": "workspace:*",
     "@lynx-js/lynx-ui": "^3.133.0",
     "@lynx-js/react": "workspace:*",
     "@lynx-js/types": "3.7.0",
diff --git a/packages/genui/a2ui/tsconfig.build.json b/packages/genui/a2ui/tsconfig.build.json
index 4e664712ac..f46b0dea72 100644
--- a/packages/genui/a2ui/tsconfig.build.json
+++ b/packages/genui/a2ui/tsconfig.build.json
@@ -3,6 +3,7 @@
   "compilerOptions": {
     "noEmit": false,
     "rootDir": "./src",
+    "tsBuildInfoFile": "./dist/tsconfig.build.tsbuildinfo",
   },
   "include": ["src"],
   "exclude": ["test"],
diff --git a/packages/genui/server/agent/a2ui-catalog.ts b/packages/genui/server/agent/a2ui-catalog.ts
index cbbb415876..8794b8bc4d 100644
--- a/packages/genui/server/agent/a2ui-catalog.ts
+++ b/packages/genui/server/agent/a2ui-catalog.ts
@@ -45,6 +45,21 @@ export interface A2UICatalog {
   components: A2UIComponentSpec[];
   extraRules?: string[];
   examples?: A2UIExample[];
+  functions?: A2UIFunctionSpec[];
+}
+
+export interface A2UIFunctionSpec {
+  description?: string;
+  name: string;
+  parameters: JsonSchema;
+  returnType:
+    | 'string'
+    | 'number'
+    | 'boolean'
+    | 'array'
+    | 'object'
+    | 'any'
+    | 'void';
 }
 
 export const BASIC_CATALOG_ID =
@@ -203,6 +218,30 @@ function componentFromManifest(
   };
 }
 
+export function createA2UICatalogFromManifests(options: {
+  catalogId: string;
+  componentManifests: Record<string, JsonSchema>[];
+  examples?: A2UIExample[];
+  extraRules?: string[];
+  functions?: A2UIFunctionSpec[];
+  label?: string;
+  version?: string;
+}): A2UICatalog {
+  return {
+    id: options.catalogId,
+    label: options.label ?? `A2UI catalog (${options.catalogId})`,
+    ...(options.version ? { version: options.version } : {}),
+    components: options.componentManifests
+      .map((manifest) => componentFromManifest(manifest as CatalogManifest))
+      .filter((component): component is A2UIComponentSpec =>
+        component !== null
+      ),
+    ...(options.extraRules ? { extraRules: options.extraRules } : {}),
+    ...(options.examples ? { examples: options.examples } : {}),
+    ...(options.functions ? { functions: options.functions } : {}),
+  };
+}
+
 export const BASIC_CATALOG: A2UICatalog = {
   id: BASIC_CATALOG_ID,
   label: 'Lynx A2UI basic catalog (v0.9)',
@@ -249,5 +288,16 @@ export function renderCatalogReference(catalog: A2UICatalog): string {
     for (const r of catalog.extraRules) lines.push(`- ${r}`);
     lines.push('');
   }
+  if (catalog.functions !== undefined && catalog.functions.length > 0) {
+    lines.push('### Available functions');
+    for (const fn of catalog.functions) {
+      lines.push(`- ${fn.name}: returns ${fn.returnType}`);
+      if (fn.description) {
+        lines.push(`  ${fn.description}`);
+      }
+      lines.push(`  parameters: ${JSON.stringify(fn.parameters)}`);
+    }
+    lines.push('');
+  }
   return lines.join('\n');
 }
diff --git a/packages/genui/server/agent/a2ui-prompt.ts b/packages/genui/server/agent/a2ui-prompt.ts
index ff01495413..eca343472a 100644
--- a/packages/genui/server/agent/a2ui-prompt.ts
+++ b/packages/genui/server/agent/a2ui-prompt.ts
@@ -173,4 +173,4 @@ export function buildA2UISystemPrompt(
   return parts.join('\n');
 }
 
-export const A2UI_SYSTEM_PROMPT = buildA2UISystemPrompt();
+export const A2UI_SYSTEM_PROMPT: string = buildA2UISystemPrompt();
diff --git a/packages/genui/tsconfig.json b/packages/genui/tsconfig.json
index 7f8d6b6ae9..ad7396c501 100644
--- a/packages/genui/tsconfig.json
+++ b/packages/genui/tsconfig.json
@@ -10,6 +10,7 @@
   "references": [
     /** packages-start */
     { "path": "./a2ui-catalog-extractor/tsconfig.json" },
+    { "path": "./a2ui-prompt/tsconfig.json" },
     { "path": "./a2ui/tsconfig.build.json" },
     { "path": "./openui/tsconfig.json" },
     { "path": "./ui-judge/tsconfig.json" },
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b0b11de74f..078a2fd0b9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -608,9 +608,9 @@ importers:
         specifier: ^2.5.1
         version: 2.5.1(preact@10.29.1)
     devDependencies:
-      '@lynx-js/a2ui-catalog-extractor':
+      '@lynx-js/a2ui-cli':
         specifier: workspace:*
-        version: link:../a2ui-catalog-extractor
+        version: link:../a2ui-cli
       '@lynx-js/lynx-ui':
         specifier: ^3.133.0
         version: 3.133.0(@lynx-js/react@packages+react)(@lynx-js/types@3.7.0)(@types/react@18.3.28)(react-dom@19.2.4(react@19.2.5))(react@19.2.5)
@@ -640,6 +640,15 @@ importers:
         specifier: ^24.10.13
         version: 24.10.13
 
+  packages/genui/a2ui-cli:
+    dependencies:
+      '@lynx-js/a2ui-catalog-extractor':
+        specifier: workspace:*
+        version: link:../a2ui-catalog-extractor
+      '@lynx-js/a2ui-prompt':
+        specifier: workspace:*
+        version: link:../a2ui-prompt
+
   packages/genui/a2ui-playground:
     dependencies:
       '@codemirror/lang-json':
@@ -716,6 +725,12 @@ importers:
         specifier: ^5.9.3
         version: 5.9.3
 
+  packages/genui/a2ui-prompt:
+    devDependencies:
+      '@types/node':
+        specifier: ^24.10.13
+        version: 24.10.13
+
   packages/genui/openui:
     dependencies:
       '@openuidev/lang-core':