How to Debug "Offline" Channel Connection Issues in Agent Reach Doctor Output

Agent Reach marks channels as "offline" when the Doctor cannot verify a working backend, typically caused by missing executables, failed environment probes, invalid configuration overrides, or missing API credentials.

Agent Reach utilizes a modular channel architecture where each platform (YouTube, Twitter, Reddit) inherits from agent_reach.channels.base.Channel. The Doctor utility—accessible via python -m agent_reach.cli doctor—orchestrates health checks across all channels and formats a human-readable report showing which platforms are ready for data collection.

How the Doctor Validates Channel Health

The Doctor executes a three-stage pipeline defined in agent_reach/doctor.py to generate its diagnostic report.

1. Channel Collection

get_all_channels() (defined in agent_reach/channels/__init__.py) instantiates every available channel singleton registered in the system.

2. Health Check Execution

check_all() iterates over the channel list and invokes ch.check(config) for each instance. Any exception raised during a check is caught to prevent a single faulty channel from crashing the entire report. The method records the active_backend (the first backend that successfully responds) and returns a status of "ok", "warn", or "off".

3. Report Formatting

format_report() converts the raw results into a Rich-markup string. Channels are grouped by tier:

• Tier 0: Zero-config channels requiring no API keys
• Tier 1: Free-key channels requiring simple authentication
• Tier 2: Complex setup channels requiring manual configuration

Each line displays a ✅/⚠️/❌ icon, the channel name, a status message, and the active backend in dim text.

Root Causes of "Offline" Channel Status

When the Doctor shows a red ❌ icon, the channel's check() method failed to verify a usable backend. The specific cause is encoded in the status message and can be traced to one of five implementation points:

• Missing Backend Binary: BaseChannel.check() in agent_reach/channels/base.py uses shutil.which() to locate executables. If the probe fails to find the binary on $PATH, the method returns "off" and the message displays "未安装" (not installed).

• Stale Shim or Broken Environment: The probe_command() function in agent_reach/probe.py executes the candidate binary with a lightweight --version flag. A non-zero exit code causes the backend to be rejected, even if the file exists.

• Invalid User Override: The configuration key <channel>_backend (or environment variable <CHANNEL>_BACKEND) dictates backend priority via Channel.ordered_backends(). If this override points to a non-existent binary, the probe fails silently and the channel remains offline.

• Missing Authentication: Tier 1 and Tier 2 channels return "warn" with messages like "未登录" (not logged in) or "请配置 API-Key" when check() cannot locate required cookies, tokens, or API keys in config.yaml.

• File Permission Errors: Lines 109–124 of agent_reach/doctor.py perform a security check. If config.yaml is world-readable, the report emits a red warning independent of channel status.

Step-by-Step Debugging Workflow

Follow this sequence to resolve "offline" statuses in the Doctor output.

1. Execute the Doctor

Run the diagnostic command to generate the current health report:

python -m agent_reach.cli doctor

2. Identify the Error Message

Locate the red ❌ icon and read the accompanying message:

• "未安装" indicates the backend binary is missing from $PATH.
• "未登录" signals missing authentication credentials for that platform.
• "体检异常：" reveals an unexpected Python error requiring manual traceback review.

3. Validate Backend Binaries

Test the executable directly in your shell. For example, to verify the YouTube backend:

which yt-dlp
yt-dlp --version

If these commands fail, reinstall the binary or activate the correct virtual environment.

4. Inspect Configuration Overrides

Run agent_reach config show or examine ~/.agent-reach/config.yaml. Ensure that <channel>_backend keys point to valid executables.

5. Provide Required Credentials

For Tier 1/2 channels, add the necessary API keys, cookies, or tokens to config.yaml. Refer to the guides in agent_reach/guides/ for the specific format required by each platform.

6. Rerun the Doctor

After correcting the environment or configuration, execute the Doctor again. The channel should now display a green ✅ icon.

Programmatically Interacting with the Doctor

You can invoke the diagnostic logic directly from Python to build custom monitoring or automate remediation.

Running Checks and Parsing Output

from agent_reach.doctor import check_all, format_report
from agent_reach.config import Config

cfg = Config()
results = check_all(cfg)          # Runs every channel's check()

report = format_report(results)   # Generates Rich-markup string

print(report)

Source: agent_reach/doctor.py

Manually Probing a Backend

from agent_reach.probe import probe_command

# YouTube channel defines backends = ["yt-dlp", "youtube-dl"]

ok, output = probe_command("yt-dlp", ["--version"])
print("Backend works?", ok)       # True if exit code is 0

Source: agent_reach/probe.py

Overriding Backend via Configuration

# ~/.agent-reach/config.yaml

youtube_backend: yt-dlp   # Forces YouTube channel to prefer yt-dlp

The Channel.ordered_backends() method in agent_reach/channels/base.py moves the specified backend to the front of the candidate list.

Core Source Files

File	Role
agent_reach/doctor.py	Orchestrates health checks via check_all() and format_report()
agent_reach/channels/base.py	Defines Channel base class, ordered_backends(), and default check() logic
agent_reach/probe.py	Executes probe_command() to verify backend executability
agent_reach/channels/__init__.py	Provides get_all_channels() registry
agent_reach/config.py	Loads and validates config.yaml settings

Summary

• Agent Reach channels appear "offline" when check() cannot verify a working backend executable or valid credentials.
• The Doctor groups channels by setup complexity (Tier 0–2) and catches all exceptions to prevent report crashes.
• Debug by validating $PATH binaries, testing --version probes, and inspecting <channel>_backend overrides in config.yaml.
• Tier 1/2 channels require manual API key or cookie configuration; missing auth triggers "未登录" warnings.
• Use probe_command() from agent_reach/probe.py to test backend viability programmatically.

Frequently Asked Questions

What does the "offline" status mean in Agent Reach Doctor?

The "offline" (❌) status indicates that check() in agent_reach/channels/base.py failed to locate a working backend binary or verify required authentication. This occurs when shutil.which() finds no executable or when probe_command() in agent_reach/probe.py returns a non-zero exit code during the version check.

How do I override which backend Agent Reach uses for a specific channel?

Set the <channel>_backend key in ~/.agent-reach/config.yaml or export the <CHANNEL>_BACKEND environment variable. The ordered_backends() method in agent_reach/channels/base.py respects this override and moves the specified binary to the front of the candidate list for that channel.

Why does a channel show "未登录" (not logged in) despite having the backend installed?

This message appears for Tier 1 or Tier 2 channels when the check() method cannot locate required credentials such as API keys, cookies, or tokens. Installation of the binary is necessary but insufficient; you must also populate the appropriate fields in config.yaml as documented in agent_reach/guides/.

Where does Agent Reach store its configuration and security settings?

Agent Reach stores user configuration in ~/.agent-reach/config.yaml. The Doctor (lines 109–124 in agent_reach/doctor.py) validates file permissions and warns if the configuration file is world-readable, as this could expose sensitive API keys to other users on the system.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}