How to Troubleshoot a Channel Showing as Unavailable in Agent Reach

Run the doctor command python -m agent_reach.cli doctor to diagnose channel health, inspect the status message for the specific failure type (missing, broken, or unauthenticated), and apply the recommended fix such as reinstalling the CLI or setting environment variables.

Agent Reach monitors platform connectivity through a built-in diagnostic subsystem. When a channel reports as unavailable, the framework's doctor module provides actionable diagnostics to identify whether the issue stems from missing binaries, authentication failures, or configuration errors. This guide explains how to interpret diagnostic results and restore channel functionality using the codebase from the Panniantong/Agent-Reach repository.

Understanding the Doctor Subsystem

The diagnostic logic resides in agent_reach/doctor.py. When you invoke the doctor, it iterates over every registered channel and calls the check() method defined in agent_reach/channels/base.py:

# agent_reach/doctor.py

for ch in get_all_channels():
    status, message = ch.check(config)
    results[ch.name] = {
        "status": status,
        "name": ch.description,
        "message": message,
        "tier": ch.tier,
        "backends": ch.backends,
        "active_backend": active,
    }

Each channel inherits from the base Channel class and implements a custom check() method that probes its supported backends. The probing mechanism executes lightweight commands to verify that external CLI tools are installed, executable, and properly authenticated.

Probe Statuses and Meanings

The probing logic in agent_reach/probe.py classifies command execution into five distinct statuses:

• ok – The command exists on PATH and runs successfully.
• missing – The command is not found on PATH (detected via shutil.which).
• broken – The binary is present but cannot execute, typically due to a stale virtual environment or broken shebang.
• timeout – The command hung longer than the configured timeout threshold.
• error – The command executed but returned a non-zero exit code.

When check() returns warn or error, the doctor displays an accompanying message generated by the channel-specific _check_* helpers. These messages contain specific remediation steps.

Step-by-Step Troubleshooting Workflow

Follow this systematic approach to resolve unavailable channels:

1. Run the doctor – Execute python -m agent_reach.cli doctor to generate a health report.
2. Identify the affected channel – Look for status indicators in the output:
   • ✅ ok – The channel is fully operational.
   • ⭐ warn – The tool is installed but requires configuration (e.g., missing authentication).
   • ❌ error – The tool is broken or missing.
3. Read the detailed error message – The message identifies the specific cause (missing binary, broken installation, or credential issues).
4. Apply the recommended fix – Install missing packages, reinstall broken tools, set environment variables, or configure credentials.
5. Verify the resolution – Rerun the doctor to confirm the status changes to ok.

Common Issues and Fixes

Problem	Source Location	Typical Message	Solution
CLI not installed	Channel.check() in base.py or channel-specific branches	"Twitter CLI 未安装"	Install the package: pipx install twitter-cli or uv tool install twitter-cli
CLI not authenticated	Channel-specific _check_* methods (e.g., TwitterChannel._check_twitter_cli)	"twitter-cli 已安装但未认证"	Export required tokens: TWITTER_AUTH_TOKEN, TWITTER_CT0
Stale venv / broken command	probe_command() → ProbeResult("broken") in probe.py	"命令存在但无法执行"	Reinstall with force: uv tool install --force <package> or pipx reinstall <package>
Command timeout	probe_command() → ProbeResult("timeout")	"响应超时（>15s）"	Check network connectivity or increase timeout values
Config file permissions	doctor.format_report()	"config.yaml 权限过宽"	Restrict permissions: chmod 600 ~/.agent-reach/config.yaml

Programmatic Troubleshooting

For automated monitoring or custom scripts, invoke the internal API directly:

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

# Load configuration from ~/.agent-reach/config.yaml

config = Config()

# Execute health checks for all channels

results = check_all(config)

# Display formatted report (identical to CLI output)

print(format_report(results))

# Check specific channel status

twitter_status = results["twitter"]
print(f"Status: {twitter_status['status']}")
print(f"Message: {twitter_status['message']}")

# Identify all unavailable channels

unavailable = [name for name, r in results.items() if r["status"] != "ok"]
print(f"Problematic channels: {unavailable}")

The results dictionary provides the same data structure used by the CLI, enabling automated responses to warn or error states.

Summary

• Run diagnostics using python -m agent_reach.cli doctor to execute the check() method for every channel defined in agent_reach/channels/base.py.
• Interpret probe statuses (ok, missing, broken, timeout, error) returned by agent_reach/probe.py to pinpoint the failure type.
• Fix missing binaries by installing the required CLI tool via pipx or uv based on the channel's installation hint.
• Resolve broken installations by force-reinstalling packages when the interpreter or shebang is corrupted.
• Configure authentication by setting environment variables specified in the channel's error message.
• Automate checks using the check_all() function from agent_reach/doctor.py for CI/CD integration.

Frequently Asked Questions

Why does the doctor report a channel as "broken" when the command exists in my terminal?

The broken status indicates that agent_reach/probe.py found the binary on PATH but could not execute it, typically due to a stale virtual environment after a Python upgrade or a corrupted shebang line. According to the reinstall_hint() logic in the source code, resolving this requires force-reinstalling the package using uv tool install --force <package> or pipx reinstall <package> to recreate the virtual environment.

How do I check channel health programmatically without using the CLI?

Import the check_all function from agent_reach/doctor.py and pass a Config instance from agent_reach/config.py. This returns a dictionary mapping channel names to status dictionaries containing the status, message, and active_backend keys. You can then filter for channels where status equals error or warn to automate troubleshooting workflows.

What should I do if the doctor shows a timeout for a specific channel?

A timeout status means the probe command exceeded the configured threshold while attempting to verify the backend. First verify network connectivity to the upstream service using standard tools like curl or ping. If the service is reachable but slow, you may need to adjust timeout settings in the configuration or check for firewall rules blocking the specific command execution.

Where does Agent Reach store configuration that might affect channel availability?

Agent Reach reads user configuration from ~/.agent-reach/config.yaml, loaded by the Config class in agent_reach/config.py. The doctor also checks file permissions during report generation and will warn if the config file is world-readable. Secure the file with chmod 600 ~/.agent-reach/config.yaml to prevent credential leakage.

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