How to Debug Unavailable Channels in Agent Reach Doctor Output

The Agent Reach Doctor reports a channel as unavailable when its check() method returns a non-ok status or raises an exception, which you can diagnose by running with --verbose and inspecting the probe logic in agent_reach/channels/<platform>.py.

The doctor command in the Panniantong/Agent-Reach repository validates every configured channel by executing health checks and rendering a Rich-styled status table. When a channel displays a red X or shows as unavailable, the output indicates either a missing dependency, misconfigured credentials, or a failed backend probe that prevents the channel from initializing.

How the Doctor Command Works

The Doctor command (python -m agent_reach.cli doctor) orchestrates channel validation through three phases defined in agent_reach/doctor.py.

First, get_all_channels() (lines 12‑20) collects every concrete subclass of BaseChannel from the channels directory. Then, the Doctor iterates through these channels and invokes each check() method inside a try/except block (lines 21‑27). If a channel raises an exception, the Doctor captures the error and records status="error".

The results dictionary (lines 28‑34) stores status, message, tier, backends, and the runtime-selected active_backend for each channel. Finally, format_report() (lines 47‑99) groups channels by tier and applies color-coding: green ✅ for status="ok", yellow ! for "warn", and red X for statuses "off" or "error".

Root Causes of Unavailable Channels

Channels appear unavailable when the check() implementation cannot validate its required environment. According to the source code, failures originate in four primary areas.

Missing External Tools

When a required binary (such as yt-dlp for YouTube or a platform-specific CLI) is not found in PATH, the channel’s check() method returns status="off". The agent_reach/doctor.py stores this state along with a message indicating the tool is not installed. Channels verify availability using shutil.which() followed by a lightweight probe_command defined in agent_reach/probe.py.

Misconfigured Credentials

If a channel requires API keys or cookie files but finds none, the check() method returns status="warn". This typically triggers a yellow warning icon rather than a red X. The validation logic calls Config.get_secret() from agent_reach/config.py to verify that required secrets exist in ~/.agent-reach/config.yaml or environment variables.

Backend Probe Failures

Channels that rely on external executables validate them through agent_reach/probe.py. When probe_command() encounters a non-zero exit code or missing binary, it returns an error tuple that forces status="error". The Doctor clears any stale active_backend value on error (lines 24‑26) to prevent leaking invalid cached states.

File Permission Issues

While not directly affecting channel status, the Doctor checks config.yaml permissions (lines 15‑24) and appends a security warning if the file is world-readable. Running chmod 600 ~/.agent-reach/config.yaml resolves this alert.

Step-by-Step Debugging Workflow

Follow this systematic approach to resolve unavailable channels identified by the Doctor.

1. Run the Doctor with verbose output

   Use the --verbose flag implemented in agent_reach/cli.py to view raw result dictionaries before formatting:

   python -m agent_reach.cli doctor --verbose

   This reveals the exact status string and exception message for each failing channel.

2. Inspect the channel’s check() implementation

   Navigate to the specific channel file (e.g., agent_reach/channels/youtube.py or agent_reach/channels/twitter.py). Locate the check() method to identify which binary it probes and which configuration keys it requires.

3. Confirm the backend binary exists

   Verify the tool is installed and executable:

   which yt-dlp
   yt-dlp --version

   The Doctor uses both shutil.which() and an execution probe, so the binary must run successfully, not merely exist in path.

4. Run the probe manually

   Replicate the Doctor’s validation using the probe module:

   python -m agent_reach.probe yt-dlp --version

   If this command fails, the error output matches what the Doctor captures.

5. Check configuration overrides

   Each channel respects a <CHANNEL>_backend environment override defined in Channel.ordered_backends (agent_reach/channels/base.py). Ensure you haven’t forced an invalid backend:

   echo $YOUTUBE_BACKEND  # Should be empty or a valid backend name
   

6. Validate credentials

   Ensure required secrets are present. The check() method calls Config.get_secret() to verify cookies or API tokens. Add missing values to ~/.agent-reach/config.yaml.

7. Re-run the Doctor

   After installing missing tools or correcting configuration, execute the Doctor again to confirm the channel displays a green ✅.

Common Pitfalls and Solutions

Pitfall	Solution
Stale virtual-environment shim	Delete broken shims or reinstall the tool; verify with probe_command rather than just which.
Incorrect backend override	Remove the environment variable (e.g., unset YOUTUBE_BACKEND) or delete the key from config.yaml.
World-readable config file	Run chmod 600 ~/.agent-reach/config.yaml to satisfy the security check in doctor.py.
Platform-specific dependencies	Some channels only support Unix systems; check for sys.platform guards in the channel’s check() method before running on Windows.

Code Examples

The following snippets demonstrate how to reproduce and override channel checks programmatically.

Reproduce a failing probe for the YouTube channel:

from agent_reach.probe import probe_command

# The YouTube channel declares `yt-dlp` as its primary backend

result = probe_command(["yt-dlp", "--version"])
print(result)   # => ('error', 'yt-dlp: command not found')  # typical failure case

Override the backend for the Reddit channel:

import os
os.environ["REDDIT_BACKEND"] = "praw"   # forces the 'praw' backend to the front

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

report = check_all(Config())
print(report["reddit"])

# => {'status': 'ok', 'active_backend': 'praw', ...}

Quick CLI check for all missing backends:

python - <<'PY'
from agent_reach.doctor import check_all, format_report
from agent_reach.config import Config
print(format_report(check_all(Config())))
PY

Summary

• The Doctor command aggregates health data by calling check() on every BaseChannel subclass and wrapping calls in exception handlers.
• A red X indicates status="off" (missing dependency) or status="error" (probe/execution failure).
• Use --verbose to expose raw error messages before they are formatted into the Rich table.
• Validate binaries with agent_reach/probe.py and verify credentials through Config.get_secret().
• Clear stale backend overrides by unsetting <CHANNEL>_backend environment variables.

Frequently Asked Questions

What does a red X mean in the Agent Reach Doctor output?

A red X appears when a channel’s check() method returns status="off" or status="error" according to agent_reach/doctor.py. This signals either a missing external tool or an exception during the health probe.

How do I see the exact error message for an unavailable channel?

Run python -m agent_reach.cli doctor --verbose. The verbose flag prints raw Python dictionaries containing the message field captured from exceptions or probe failures before the Rich formatter processes them.

Why does a channel show as "error" even when the binary exists?

The Doctor validates binaries using probe_command in agent_reach/probe.py, not just shutil.which(). If the binary exists but crashes on execution (e.g., a stale virtual-environment shim), the probe returns an error status. Run the binary manually or use python -m agent_reach.probe <command> to verify it exits cleanly.

Can I disable channels I do not plan to use?

The Doctor automatically discovers all concrete channel subclasses, but it does not require unavailable channels to function. You can ignore red X marks for channels you do not need, or set <CHANNEL>_backend=none if the channel supports a null backend override, though availability depends on the specific implementation in agent_reach/channels/base.py.

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