hitl-cli 1.2.0

Command-line interface and SDK for Human-in-the-Loop services.

HITL-CLI: Human-in-the-Loop Command-Line Interface and SDK

hitl-cli is the official reference client for the Human-in-the-Loop (HITL) mobile application. It provides a powerful command-line interface (CLI) and Python SDK to programmatically request input from, and send notifications to, a human user via their mobile device.

It features zero-config, secure authentication using OAuth 2.1 and supports end-to-end encryption (E2EE) for confidential interactions.

Features

• Command-Line Interface: Easily send HITL requests from your terminal or shell scripts.
• Python SDK: Integrate human-in-the-loop workflows directly into your Python applications.
• Secure by Default: Uses modern OAuth 2.1 with PKCE for user authentication. No manual client setup needed.
• End-to-End Encryption: A local proxy mode enables E2EE for use with tools like Claude Desktop, ensuring the server only handles encrypted data.
• Service Authentication: Supports API key authentication for non-interactive environments (e.g., CI/CD, backend services).

1. Installation

Install hitl-cli from PyPI using pip (or your preferred Python package manager):

pip install hitl-cli

2. Authentication

You can authenticate in two ways: OAuth 2.1 (for users) or API Keys (for services).

Option A: OAuth 2.1 (Recommended for Users)

This is the standard method for interactive use. The login command will open your browser to authenticate and securely store your credentials.

1. Run the login command:

   hitl-cli login --name "My Workstation"
   

   This will open a browser window for you to log in or sign up.

2. Authenticate in the browser.

3. Upon success, your credentials will be securely stored, and your CLI will be ready to use.

Option B: API Key (for Services and Automation)

For non-interactive environments, you can authenticate by setting an environment variable.

export HITL_API_KEY="your_api_key_here"

# Now you can use the CLI without the login step
hitl-cli notify --message "The nightly build has completed."

3. Usage Patterns

A. As a Command-Line Tool

Quickly request human input or send notifications directly from your terminal.

Example: Requesting Input

# Request a simple confirmation
hitl-cli request --prompt "Do you approve the deployment to production?"

# Provide multiple choices
hitl-cli request --prompt "Which environment to deploy?" --choice "Staging" --choice "Production"

Example: Sending a Notification

hitl-cli notify --message "The data processing job has started."

B. As a Python SDK

Integrate HITL workflows into your Python applications using the HITL class.

import asyncio
from hitl_cli import HITL

async def main():
    # The SDK automatically uses your configured credentials (OAuth or API Key)
    hitl = HITL()

    try:
        # Request input and wait for the response
        user_response = await hitl.request_input(
            "Do you want to proceed with the database migration?",
            choices=["Yes", "No", "Postpone"]
        )

        print(f"Human response: {user_response}")

        if user_response == "Yes":
            await hitl.notify("Database migration started.")
            # ... run migration ...
            await hitl.notify_completion("The database migration is complete!")

    except Exception as e:
        print(f"An error occurred: {e}")

if __name__ == "__main__":
    asyncio.run(main())

C. End-to-End Encryption with a Local Proxy

For maximum security, hitl-cli can act as a local Model Context Protocol (MCP) proxy. This allows tools like Claude Desktop to interact with a human while ensuring that the prompt and response are end-to-end encrypted. The HITL server only relays the encrypted data and never sees the plaintext content.

1. Log in first:

   hitl-cli login --name "My E2EE Agent"
   

2. Configure your MCP client (e.g., Claude Desktop's mcp_servers.json):

   {
     "mcpServers": {
       "human": {
         "command": "hitl-cli",
         "args": ["proxy", "https://hitlrelay.app/mcp-server/mcp/"]
       }
     }
   }
   

The proxy will automatically encrypt the request and decrypt the response. The llm will still use the unecrypted enpoints and the hit-cli proxy will use the endpoints ending in e2ee

```python
human.request_human_input(prompt="Please provide the API key for the staging environment.")
```

D. Continuous Interaction Hook for Claude Code

The hitl-hook-review-and-continue hook provides a powerful way to create a continuous interaction loop with Claude Code. When Claude finishes a task, this hook intercepts the stop event, asks for your confirmation via the HITL app, and feeds your response back to Claude as new instructions.

Setup:

Add the following to your Claude Code settings file:

• ~/.claude/settings.json (user-level, affects all projects)
• .claude/settings.local.json (project-level, gitignored)

{
  "hooks": {
    "Stop": [
      {
        "matcher": ".*",
        "hooks": [
          {
            "type": "command",
            "command": "hitl-hook-review-and-continue"
          }
        ]
      }
    ]
  }
}

How it works:

• When Claude Code finishes responding, the hook executes
• A prompt appears on your HITL mobile app
• You can review what Claude did and provide feedback
• Your response is fed back to Claude as new instructions
• This creates an interactive review-and-continue workflow

For more details on hooks, see the Claude Code hooks documentation.

This turns hitl-cli into a remote control for your AI assistant.