# How to Troubleshoot a Channel Showing as Unavailable in Agent Reach

> Troubleshoot an unavailable channel in Agent Reach by running the doctor command. Inspect status messages and apply fixes like reinstalling the CLI or setting environment variables for channel health.

- Repository: [Pnant/Agent-Reach](https://github.com/Panniantong/Agent-Reach)
- Tags: how-to-guide
- Published: 2026-07-08

---

**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`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/channels/base.py):

```python

# 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`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/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:

```python
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`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/channels/base.py).
- **Interpret probe statuses** (`ok`, `missing`, `broken`, `timeout`, `error`) returned by [`agent_reach/probe.py`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/agent_reach/doctor.py) and pass a `Config` instance from [`agent_reach/config.py`](https://github.com/Panniantong/Agent-Reach/blob/main/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`](https://github.com/Panniantong/Agent-Reach/blob/main/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.