Create persistent AI agents that turn your company's scattered knowledge into action — powered by the Agents Server
- Gemini 3 Support
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 GPT-5.2 and Claude-4.5 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.
|
Paul Smith |
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.
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 |
Goals define what the agent should actively work toward. Unlike a chatbot that only responds when asked, an agent with goals takes initiative and works on tasks persistently on the Agents Server.
|
Paul Smith & Associés |
Knowledge Commitment allows you to provide specific information, facts, or context that the AI should be aware of when responding.
This can include domain-specific knowledge, company policies, or any other relevant information.
Promptbook Engine will automatically enforce this knowledge during interactions. When the knowledge is short enough, it will be included in the prompt. When it is too long, it will be stored in vector databases and RAG retrieved when needed. But you don't need to care about it.
|
Paul Smith & Associés |
Rules will enforce specific behaviors or constraints on the AI's responses. This can include ethical guidelines, communication styles, or any other rules you want the AI to follow.
Depending on rule strictness, Promptbook will either propagate it to the prompt or use other techniques, like adversary agent, to enforce it.
|
Paul Smith & Associés |
Use commitments grant the agent real capabilities — tools it can use to interact with the outside world. USE EMAIL lets the agent send emails, USE BROWSER lets it access and read web content, USE SEARCH ENGINE lets it search the web, and many more.
These are what turn a chatbot into a persistent agent that actually does work.
|
Paul Smith & Associés |
Team commitment allows you to define the team structure and advisory fellow members the AI can consult with. This allows the AI to simulate collaboration and consultation with other experts, enhancing the quality of its responses.
|
Paul Smith & Associés |
Promptbook is an ecosystem of tools centered around the Agents Server — a production-ready platform for running persistent AI agents.
The Agents Server is the primary way to use Promptbook. It is a web application where your AI agents live and work. You can create agents, give them knowledge and rules using the Book language, organize them into teams, and let them work on goals persistently. The Agents Server provides a UI for managing agents, an API for integrating them into your applications, and can be self-hosted via Docker or deployed on Vercel.
The Promptbook Engine is the open-source core that powers everything. It parses the Book language, applies commitments, manages LLM provider integrations, and executes agents. The Agents Server is built on top of the Engine. If you need to embed agent capabilities directly into your own application, you can use the Engine as a standalone TypeScript/JavaScript library via NPM packages.
Promptbook project is an ecosystem centered around the Agents Server — a platform for creating, deploying, and running persistent AI agents. Following is a list of the most important pieces of the project:
| Project | About |
|---|---|
| ⭐ Agents Server | The primary way to use Promptbook. A production-ready platform where your AI agents live — create, manage, deploy, and interact with persistent agents that work on goals. Available as a hosted service or self-hosted via Docker. |
| Book language |
Human-friendly, high-level language that abstracts away low-level details of AI. It allows to focus on personality, behavior, knowledge, and rules of AI agents rather than on models, parameters, and prompt engineering.
There is also a plugin for VSCode to support .book file extension
|
| Promptbook Engine | The open-source core that powers the Agents Server. Can also be used as a standalone TypeScript/JavaScript library to embed agent capabilities into your own applications. Released as multiple NPM packages. |
Join our growing community of developers and users:
| Platform | Description |
|---|---|
| 💬 Discord | Join our active developer community for discussions and support |
| 🗣️ GitHub Discussions | Technical discussions, feature requests, and community Q&A |
| Professional updates and industry insights | |
| General announcements and community engagement | |
| 🔗 ptbk.io | Official landing page with project information |
| 📸 Instagram @promptbook.studio | Visual updates, UI showcases, and design inspiration |
See detailed guides and API reference in the docs or online.
For information on reporting security vulnerabilities, see our Security Policy.
The fastest way to get started is with the Agents Server:
- 🐋 Docker image — Self-host the Agents Server with full control over your data
- ☁️ Hosted Agents Server — Start creating agents immediately, no setup required
If you want to embed the Promptbook Engine directly into your application, the library is divided into several packages published from a single monorepo. You can install all of them at once:
npm i ptbkOr you can install them separately:
⭐ Marked packages are worth to try first
- ⭐ ptbk - Bundle of all packages, when you want to install everything and you don't care about the size
- promptbook - Same as
ptbk - ⭐🧙♂️ @promptbook/wizard - Wizard to just run the books in node without any struggle
- @promptbook/core - Core of the library, it contains the main logic for promptbooks
- @promptbook/node - Core of the library for Node.js environment
- @promptbook/browser - Core of the library for browser environment
- ⭐ @promptbook/utils - Utility functions used in the library but also useful for individual use in preprocessing and postprocessing LLM inputs and outputs
- @promptbook/markdown-utils - Utility functions used for processing markdown
- @promptbook/javascript - Execution tools for javascript inside promptbooks
- @promptbook/openai - Execution tools for OpenAI API, wrapper around OpenAI SDK
- @promptbook/anthropic-claude - Execution tools for Anthropic Claude API, wrapper around Anthropic Claude SDK
- @promptbook/vercel - Adapter for Vercel functionalities
- @promptbook/google - Integration with Google's Gemini API
- @promptbook/deepseek - Integration with DeepSeek API
- @promptbook/ollama - Integration with Ollama API
- @promptbook/azure-openai - Execution tools for Azure OpenAI API
- @promptbook/fake-llm - Mocked execution tools for testing the library and saving the tokens
- @promptbook/remote-client - Remote client for remote execution of promptbooks
- @promptbook/remote-server - Remote server for remote execution of promptbooks
- @promptbook/pdf - Read knowledge from
.pdfdocuments - @promptbook/documents - Integration of Markitdown by Microsoft
- @promptbook/documents - Read knowledge from documents like
.docx,.odt,… - @promptbook/legacy-documents - Read knowledge from legacy documents like
.doc,.rtf,… - @promptbook/website-crawler - Crawl knowledge from the web
- @promptbook/editable - Editable book as native javascript object with imperative object API
- @promptbook/templates - Useful templates and examples of books which can be used as a starting point
- @promptbook/types - Just typescript types used in the library
- @promptbook/color - Color manipulation library
- @promptbook/cli - Command line interface utilities for promptbooks
The following glossary is used to clarify certain concepts:
- Prompt drift is a phenomenon where the AI model starts to generate outputs that are not aligned with the original prompt. This can happen due to the model's training data, the prompt's wording, or the model's architecture.
- Pipeline, workflow scenario or chain is a sequence of tasks that are executed in a specific order. In the context of AI, a pipeline can refer to a sequence of AI models that are used to process data.
- Fine-tuning is a process where a pre-trained AI model is further trained on a specific dataset to improve its performance on a specific task.
- Zero-shot learning is a machine learning paradigm where a model is trained to perform a task without any labeled examples. Instead, the model is provided with a description of the task and is expected to generate the correct output.
- Few-shot learning is a machine learning paradigm where a model is trained to perform a task with only a few labeled examples. This is in contrast to traditional machine learning, where models are trained on large datasets.
- Meta-learning is a machine learning paradigm where a model is trained on a variety of tasks and is able to learn new tasks with minimal additional training. This is achieved by learning a set of meta-parameters that can be quickly adapted to new tasks.
- Retrieval-augmented generation is a machine learning paradigm where a model generates text by retrieving relevant information from a large database of text. This approach combines the benefits of generative models and retrieval models.
- Longtail refers to non-common or rare events, items, or entities that are not well-represented in the training data of machine learning models. Longtail items are often challenging for models to predict accurately.
Note: This section is not a complete dictionary, more list of general AI / LLM terms that has connection with Promptbook
- 📚 Collection of pipelines
- 📯 Pipeline
- 🙇♂️ Tasks and pipeline sections
- 🤼 Personas
- ⭕ Parameters
- 🚀 Pipeline execution
- 🧪 Expectations - Define what outputs should look like and how they're validated
- ✂️ Postprocessing - How outputs are refined after generation
- 🔣 Words not tokens - The human-friendly way to think about text generation
- ☯ Separation of concerns - How Book language organizes different aspects of AI workflows
| Data & Knowledge Management | Pipeline Control |
|---|---|
|
|
| Language & Output Control | Advanced Generation |
|
|
The Agents Server is the primary way to use Promptbook. It is a production-ready platform where you create, deploy, and manage persistent AI agents that work toward goals. Agents remember context across conversations, collaborate in teams, and follow the rules and knowledge you define in the Book language.
- Hosted at gallery.ptbk.io — start creating agents immediately
- Self-hosted via Docker — full control over your data and infrastructure
- API for integrating agents into your own applications
The Engine is the open-source core that powers the Agents Server. If you need to embed agent capabilities directly into your TypeScript/JavaScript application, you can use it as a standalone library.
- When you want to deploy persistent AI agents that work on goals for your company
- When you need agents with specific personalities, knowledge, and rules tailored to your business
- When you want agents that collaborate in teams and consult each other
- When you need to integrate AI agents into your existing applications via API
- When you want to self-host your AI agents with full control over data and infrastructure
- When you are writing an app that generates complex things via LLM — like websites, articles, presentations, code, stories, songs,...
- When you want to version your agent definitions and test multiple versions
- When you want to log agent execution and backtrace issues
- When a single simple prompt already works fine for your job
- When OpenAI Assistant (GPTs) is enough for you
- When you need streaming (this may be implemented in the future, see discussion)
- When you need to use something other than JavaScript or TypeScript (other languages are on the way, see the discussion)
- When your main focus is on something other than text — like images, audio, video, spreadsheets (other media types may be added in the future, see discussion)
- When you need to use recursion (see the discussion)
If you have a question start a discussion, open an issue or write me an email.
- ❔ Why not just use the OpenAI SDK / Anthropic Claude SDK / ...?
- ❔ How is it different from the OpenAI`s GPTs?
- ❔ How is it different from the Langchain?
- ❔ How is it different from the DSPy?
- ❔ How is it different from anything?
- ❔ Is Promptbook using RAG (Retrieval-Augmented Generation)?
- ❔ Is Promptbook using function calling?
See CHANGELOG.md
This project is licensed under BUSL 1.1.
We welcome contributions! See CONTRIBUTING.md for guidelines.
You can also ⭐ star the project, follow us on GitHub or various other social networks.We are open to pull requests, feedback, and suggestions.
Need help with Book language? We're here for you!
- 💬 Join our Discord community for real-time support
- 📝 Browse our GitHub discussions for FAQs and community knowledge
- 🐛 Report issues for bugs or feature requests
- 📚 Visit ptbk.io for more resources and documentation
- 📧 Contact us directly through the channels listed in our signpost
We welcome contributions and feedback to make Book language better for everyone!