# How Agent-Reach Auto-Detects Local vs Server Environments for OpenCLI

> Agent-Reach auto-detects local vs server environments for OpenCLI. Learn how it probes the OpenCLI binary and checks for the Chrome extension to power your workflow.

- Repository: [Pnant/Agent-Reach](https://github.com/Panniantong/Agent-Reach)
- Tags: internals
- Published: 2026-07-13

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**Agent-Reach automatically detects whether the OpenCLI backend is usable by probing the OpenCLI binary, its daemon status, and the presence of the Chrome extension folder on disk—falling back to server-side alternatives when the extension is absent.**

Agent-Reach is an open-source automation framework that routes commands to different backends depending on the runtime environment. To determine whether OpenCLI (a browser-automation backend requiring Chrome) can run on the current machine, Agent-Reach implements a multi-layered detection system in [`agent_reach/backends/opencli.py`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/backends/opencli.py).

## Why Environment Detection Matters for OpenCLI

OpenCLI relies on a Chrome browser session for authentication and operation. While this works perfectly on local desktops with graphical environments, it fails on headless servers lacking Chrome. Agent-Reach solves this by probing the system before attempting to use OpenCLI, ensuring seamless fallback to API-based or CLI-only backends on server environments.

## The Four-Layer Detection Mechanism in [`opencli.py`](https://github.com/Panniantong/Agent-Reach/blob/main/opencli.py)

The detection logic runs through four distinct checks before marking OpenCLI as ready.

### 1. Binary Presence Check

The detection starts by verifying the OpenCLI command exists. In [`agent_reach/backends/opencli.py`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/backends/opencli.py) lines 80-87, the `opencli_status` function runs `opencli --version`. If the command returns a non-zero exit code or is missing, `installed` is set to `False` and the backend is immediately marked unavailable.

### 2. Daemon and Extension Connection Status

Next, the probe executes `opencli daemon status` and parses the output to set two boolean flags: `daemon_running` and `extension_connected` (lines 99-112). This reveals whether the OpenCLI daemon is active and whether the Chrome extension is currently communicating with it.

### 3. Extension Folder Detection on Disk

Because a disconnected extension may still be present (it wakes on the first real call), the code checks for the extension folder in typical Chrome profile locations. On macOS/Linux, it searches `_CHROME_PROFILE_ROOTS`; on Windows, it checks `%LOCALAPPDATA%` (lines 40-55). If the folder exists, `extension_installed` becomes `True`.

### 4. The `ready` Property Decision Logic

The final determination happens in the `OpenCLIStatus.ready` property (lines 68-77). This returns `True` only when OpenCLI is installed, not broken, **and** either the extension is already connected **or** the extension files are present on disk. On servers without Chrome, the extension folder is absent, so `ready` returns `False`.

## How Channel Routing Uses the Detection Results

Each channel defines an ordered list of preferred backends. For example, [`xiaohongshu.py`](https://github.com/Panniantong/Agent-Reach/blob/main/xiaohongshu.py) specifies `["OpenCLI", "xiaohongshu-mcp", "xhs-cli"]` (lines 152-155). The core routing logic in [`agent_reach/core.py`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/core.py) iterates through this list, calling `opencli_status()` for each backend. It selects the first backend where `ready` is `True`. Consequently, desktop machines with Chrome use OpenCLI, while servers automatically fall back to MCP or CLI alternatives.

## Practical Implementation Examples

Here is how to probe the current environment programmatically:

```python
from agent_reach.backends.opencli import opencli_status

# Probe the current machine

status = opencli_status()

if status.ready:
    print("OpenCLI is usable – we are on a desktop with Chrome.")
else:
    print("OpenCLI not ready – falling back to server-side backends.")

```

The `opencli_summary` function (lines 24-36) generates user-visible status strings like "未安装" (not installed), "已安装但扩展未安装" (installed but extension not installed), or "可用（浏览器登录态）" (available with browser login), which the CLI displays when showing the active backend.

## Summary

Agent-Reach's environment detection ensures OpenCLI only runs where it can succeed:

- **Binary check**: Verifies `opencli` is installed via `opencli --version`
- **Daemon check**: Confirms `opencli daemon status` reports a running daemon
- **Extension probe**: Looks for Chrome extension files in standard profile directories
- **Ready flag**: Combines these checks to determine desktop vs server eligibility
- **Automatic fallback**: Core routing selects the first ready backend from the channel's priority list

## Frequently Asked Questions

### How does Agent-Reach detect if OpenCLI is installed?

Agent-Reach runs `opencli --version` in a subprocess. If the command exits with an error or is not found in the system PATH, the `installed` flag is set to `False` in [`agent_reach/backends/opencli.py`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/backends/opencli.py) (lines 80-87).

### What happens if Chrome is installed but the extension is not running?

The probe checks for the extension folder on disk in standard Chrome profile locations. If the files exist, `extension_installed` is `True`, and the `ready` property returns `True` because the extension will wake on the first actual call.

### How does the routing system choose between OpenCLI and server backends?

Each channel defines a prioritized list of backends (e.g., `["OpenCLI", "xiaohongshu-mcp"]`). The core routing logic in [`agent_reach/core.py`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/core.py) iterates through this list and selects the first backend where `opencli_status().ready` is `True`.

### Can I force OpenCLI to run on a server without Chrome?

No. If the Chrome extension folder is absent from standard profile locations and the extension is not connected, `ready` will be `False`, causing the router to skip OpenCLI and use the next available backend.