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Prompt Lockbox is quite easy to install. Its available on pypi index, so all you need is a python package installer pip!
Supported Python version: > 3.10

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How to install ?

You can directly install the toolkit using pip or from our github repo.
It is advised to create a new virtual environment to avoid any unnecessary package conflict.
Install using command - 
pip install prompt-lockbox
This will setup Prompt Lockbox and all related dependencies. Alternatively -
Navigate to your local directory, open command palette and clone the repo using -
git clone https://github.com/ananya868/prompt-lockbox.git
Then install the toolkit using pip -
pip install -e prompt-lockbox/
This will install the package in your python environment.
Setup is done. We can now create a new Prompt Lockbox Project !

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Create a new project

The first step is to create a project, which is nothing but setting up the necessary directories and configuration files for you. To do this, we will use CLI for this guide. Well, you can also use the SDK for these tasks, checkout SDK. In your project directory, run - 
plb init .
This command will initialize a Prompt Lockbox project and build these files -
  • prompts/: The directory where all your versioned .yml prompt files will live.
  • .plb/: A hidden directory for internal data in toolkit like search indexes, logs etc.
  • plb.toml: The main configuration file for your project. You can use it to set project-wide settings, like the AI model for automated tasks.
  • .plb.lock: The lockfile that stores the secure hashes of your production-ready prompts, protecting them from unauthorized changes.
We have created a Project. Now we can start building prompts !

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Create a Prompt

Now that we have our project, let’s create our first prompt. We’ll use the interactive create command, which guides you through setting up all the required metadata. In your terminal, run - 
plb create
Answer the entries as required. For most, you can just press Enter to accept the default value. Let’s say prompt name is ‘Customer-support-agent’. The create command creates a new file named prompts/Customer-support-agent.v1.0.0.yml. Hurray! You have created your first prompt. But note that its just a template and the actual content and other metadata should be filled by the user.

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Template

Here are two templates for your reference — one is blank, and the other is a completed customer support agent prompt template with content and metadata - 
# PROMPT IDENTITY
# --------------------
id: prm_524a1cb9cccd4129b57db8b2f3d9a291
name: "Customer-support-agent"
version: "1.0.0"

# DOCUMENTATION
# --------------------
description: ""
namespace: []
tags: []

# OWNERSHIP & STATUS
# --------------------
status: "Draft"
author: "ananya868 <ananya8154@gmail.com>"
last_update: "2025-06-27T15:00:00.000000+00:00"

# CONFIGURATION
# --------------------
intended_model:
model_parameters:
  temperature: 0.7

# NOTES & LINKS
# --------------------
linked_prompts: []
notes: ""

# - - - 💖 THE PROMPT 💖 - - -
# ---------------------------------
# NOTE - Comments inside the prompt are automatically removed on prompt call.
default_inputs:
  user_input: "Sample Input"

template: |
  You are a helpful assistant.

  -- Now you can start writing your prompt template! --

  How to use this template:
  - To input a value: ${user_input}
  - To add a comment: {# This is a comment #}

  Create awesome prompts! :)

# PROMPT IDENTITY
# --------------------
id: prm_524a1cb9cccd4129b57db8b2f3d9a291
name: "Customer-support-agent"
version: "1.0.0"

# DOCUMENTATION
# --------------------
description: Create a short persuasive email for small tech business owners to
  promote a customer support agent product.
namespace: [Customer-Support, AI-tool]
tags:
- email
- persuasive
- small business
- customer support
- automation

# OWNERSHIP & STATUS
# --------------------
status: "Draft"
author: "ananya868 <ananya8154@gmail.com>"
last_update: "2025-06-27T15:00:00.000000+00:00"

# CONFIGURATION
# --------------------
intended_model: "gpt-4.1"
model_parameters:
  temperature: 0.7
  max_tokens: 1024

# NOTES & LINKS
# --------------------
linked_prompts: [Customer-monitor-agent]
notes: "Do not push to production."

# - - - 💖 THE PROMPT 💖 - - -
# ---------------------------------
default_inputs:
  product: "AI customer support agent"

template: |
  Write a short, persuasive email to small tech business owners promoting an '{{product}}'. Keep the tone friendly and professional. Follow this structure:
  1. Subject Line: Eye-catching and relevant (e.g., '24/7 Support Without Hiring More Staff').
  2. Opening: Greet the reader and mention a common support challenge.
  3. Body: Highlight how the product improves response time, reduces workload, and boosts customer satisfaction. Add a brief success story or stat.
  4. Call to Action: Invite them to book a demo or try it out.
  5. Closing: Sign off warmly with contact info.
The create command builds an empty template. Open the prompts/Customer-support-agent.v1.0.0.yml file in your code editor. Find the template: key and replace the placeholder content with the filled example above or write your own !

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Run the prompt

LLM configuration is required for this step. While the toolkit itself is not LLM-dependent, some features rely on it. Please configure LLM before proceeding.
Let’s execute our prompt using the run command. The command will see the required variables and ask you for them. It will run the prompt against a LLM of your choice (llm needs to be set as a configuration). Checkout LLMs to find a list of supported models. In your terminal, run - 
plb run Customer-support-agent --execute
It will render the filled prompt and the output generated using the specified LLM.

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Next Steps

Discover AI-Powered Features Available After LLM Setup.

Configure LLM

Setup your LLM.

AI Features

Get a quick look on AI features.