detect_agent

This is a Python Port of Vercels NPM package

A lightweight utility for detecting if code is being executed by an AI agent or automated development environment.

Installation

uv add detect_agent

Usage

from detect_agent import determine_agent

result = determine_agent()

if result["is_agent"]:
  print(f"Running in {result["agent"]["name"]} environment");

Supported Agents

This package can detect the following AI agents and development environments:

• Custom agents via AI_AGENT environment variable
• Cursor (cursor editor and cursor-cli)
• Claude Code (Anthropic's Claude)
• Devin (Cognition Labs)
• Gemini CLI (Google)
• Codex (OpenAI)
• Antigravity (Google DeepMind)
• GitHub Copilot (via AI_AGENT=github-copilot|github-copilot-cli, COPILOT_MODEL, COPILOT_ALLOW_ALL, or COPILOT_GITHUB_TOKEN)
• Replit (online IDE)

The AI_AGENT Standard

We're promoting AI_AGENT as a universal environment variable standard for AI development tools. This allows any tool or library to easily detect when it's running in an AI-driven environment.

For AI Tool Developers

Set the AI_AGENT environment variable to identify your tool:

export AI_AGENT="your-tool-name"
# or
AI_AGENT="your-tool-name" your-command

Recommended Naming Convention

• Use lowercase with hyphens for multi-word names
• Include version information if needed, separated by an @ symbol
• Examples: claude-code, cursor-cli, devin@1, custom-agent@2.0

Development

uv sync --extra dev
uv run pytest
# Lint and format check (CI)
uv run ruff check . && uv run ruff format --check .
# Fix and format
uv run ruff check . --fix && uv run ruff format .

Use Cases

Adaptive Behavior

from detect_agent import determine_agent
import os

def setup_environment():
  result = determine_agent()

  if (result["is_agent"]) {
    # Running in AI environment - adjust behavior
    os.environ.setdefault("TOGETHER_LOG", "debug")
    print(f"🤖 Detected AI agent: {result["agent"]["name"]}");

Telemetry and Analytics

from detect_agent import determine_agent

def track_usage(event: string):
  result = determine_agent();

  analytics.track(event, {
    "agent": result["agent"]["name"] if result["is_agent"] else "human",
  })

Adding New Agent Support

To add support for a new AI agent:

1. Add detection logic to main.py
2. Add comprehensive test cases in test.py
3. Update this README with the new agent information
4. Follow the existing priority order pattern