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🐙 Promptbook: Invisible AI Agents

Create persistent AI agents that turn your company's scattered knowledge into action - powered by the Agents Server

Promptbook](https://www.npmjs.com/package/promptbook) Promptbook](https://packagequality.com/#?package=promptbook)

🚀 Quick deploy

Run the standalone VPS installer _(for example on DigitalOcean)_ only on a fresh server. Interactive mode asks for the installation values:

Non-interactive mode takes defaults from command-line options. Use --env live, --env preview, --env production, or --env lts to pick the installed environment; the default is preview. When --openai-api-key is provided with the default OpenAI Codex runner, the installer installs and configures Codex automatically; other runner authentication can be configured later from the UI or SSH:

⚠ Warning: This is a pre-release version of the library. It is not yet ready for production use. Please look at latest stable release.

📦 Package @promptbook/javascript

• Promptbooks are divided into several packages, all are published from single monorepo. • This package @promptbook/javascript is one part of the promptbook ecosystem.

To install this package, run:

JavaScript execution engine for Promptbook, providing secure JavaScript code execution within promptbook pipelines and script tasks.

🎯 Purpose and Motivation

This package provides a secure JavaScript execution environment for Promptbook pipelines. It enables the execution of JavaScript code in SCRIPT tasks, allowing for complex data transformations, calculations, and logic within promptbook workflows while maintaining security and isolation.

🔧 High-Level Functionality

The package provides JavaScript execution capabilities:

• Script Task Execution: Execute JavaScript code within promptbook SCRIPT tasks • Variable Extraction: Analyze JavaScript code to extract variable dependencies • Postprocessing Functions: Built-in JavaScript functions for common postprocessing tasks • Secure Execution: Safe execution environment with proper isolation • Multiple Execution Modes: Support for different JavaScript execution strategies

✨ Key Features

• 🔒 Secure Execution - Safe JavaScript execution with proper sandboxing • 📝 Script Tasks - Execute JavaScript code within promptbook pipelines • 🔧 Variable Analysis - Extract variable dependencies from JavaScript code • 📊 Postprocessing Functions - Built-in functions for common data transformations • ⚡ Multiple Execution Modes - Different execution strategies for various use cases • 🛡️ Error Handling - Comprehensive error handling for script execution • 🎯 Pipeline Integration - Seamless integration with promptbook execution flow

📦 Exported Entities

Version Information

• BOOK_LANGUAGE_VERSION - Current book language version • PROMPTBOOK_ENGINE_VERSION - Current engine version

Execution Tools

• JavascriptEvalExecutionTools - JavaScript execution tools using eval • JavascriptExecutionTools - Standard JavaScript execution tools

Postprocessing

• POSTPROCESSING_FUNCTIONS - Built-in postprocessing functions for JavaScript

Utilities

• extractVariablesFromJavascript - Extract variable dependencies from JavaScript code

💡 This package provides JavaScript execution for promptbook applications. For the core functionality, see @promptbook/core or install all packages with npm i ptbk

Rest of the documentation is common for entire promptbook ecosystem:

📖 The Book Whitepaper

Promptbook lets you create persistent AI agents that work on real goals for your company. The Agents Server is the heart of the project - a place where your AI agents live, remember context, collaborate in teams, and get things done.

Nowadays, the biggest challenge for most business applications isn't the raw capabilities of AI models. Large language models such as Claude Mythos, GPT-5.6 or Kimi K2.7 are incredibly capable.

The main challenge lies in managing the context, providing rules and knowledge, and narrowing the personality.

In Promptbook, you define your agents using simple Books - a human-readable language that is explicit, easy to understand and write, reliable, and highly portable. You then deploy them to the Agents Server, where they run persistently and work toward their goals.

Lawyer

GOAL You are a company lawyer. Your job is to provide legal advice and support to the company and its employees. Respond to incoming legal inquiries via email and keep the company website updated with the latest legal policies.

RULE You are knowledgeable, professional, and detail-oriented. KNOWLEDGE https://company.com/company-policies.pdf KNOWLEDGE https://company.com/internal-documents/employee-handbook.docx

TEAM You are part of the legal team of Paul Smith & Associés, you discuss with {Emily White}, the head of the compliance department. {George Brown} is expert in corporate law and {Sophia Black} is expert in labor law.

Aspects of great AI agent

We have created a language called Book, which allows you to write AI agents in their native language and create your own AI persona. Book provides a guide to define all the traits and commitments.

You can look at it as "prompting" _(or writing a system message)_, but decorated by commitments.

Commitments are special syntax elements that define contracts between you and the AI agent. They are transformed by Promptbook Engine into low-level parameters like which model to use, its temperature, system message, RAG index, MCP servers, and many other parameters. For some commitments _(for example RULE commitment)_ Promptbook Engine can even create adversary agents and extra checks to enforce the rules.

Persona commitment

Personas define the character of your AI persona, its role, and how it should interact with users. It sets the tone and style of communication.

Paul Smith & Associés

PERSONA You are a company lawyer. Your job is to provide legal advice and support to the company and its employees.

Goal commitment…

Description from the npm listing.