Installing and Configuring an AI Coding Assistant CLI: A Practical Guide

1. Prerequisites

Before installing the tool, verify three things: your operating system, whether your network environment meets the service provider’s requirements, and whether your account can subscribe using an officially supported payment method. Command-line tools of this type typically depend on cloud-based large language model services. The installation itself is usually straightforward; network access and account setup are more common sources of problems.

Network availability is the first requirement. Check the supported regions listed in the official documentation. If your location is not supported, follow the provider’s policies and do not attempt to bypass regional restrictions. If you are using a corporate or school network, ask your network administrator which domains are allowed and configure a proxy according to your organization’s rules.

If downloads are slow, you may use a mirror source recognized by the official documentation. Before installing from a mirror, verify the package name and publisher to ensure that you are installing the same software package.

2. Installing on macOS

Before installation, review the official documentation to confirm the currently recommended installation method and required runtime versions. One common approach requires Node.js. Use the version specified in the official documentation:

npm install -g @anthropic-ai/claude-code

After installation, run the version command to confirm that the tool is available:

claude --version

If the command cannot be found, the global npm installation directory may not be included in PATH. Check the npm global directory with:

npm config get prefix

Add the bin directory under the displayed path to a shell configuration file such as ~/.zshrc. Save the file and reopen the terminal.

Before upgrading, review the release notes and back up any custom configuration files. Use the following command to upgrade:

npm update -g @anthropic-ai/claude-code

A new version may change interfaces or configuration formats. If problems occur after an upgrade, check the release notes first before deciding whether to roll back.

3. Installing on Windows

On Windows, install a supported Long-Term Support version of Node.js from the Node.js website. Then open PowerShell or Command Prompt and run:

npm install -g @anthropic-ai/claude-code
claude --version

The two terminal environments may behave differently. Command Prompt can usually run claude directly. Under its default execution policy, PowerShell may block the .ps1 script generated by npm. The error may state that the file cannot be loaded because script execution is disabled on the system.

In this case, you can run claude.cmd instead. Alternatively, after understanding the security implications, you can adjust the execution policy for the current user:

Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy RemoteSigned

Changing the execution policy affects system security settings. Confirm that the change complies with your organization’s policies before applying it.

If your network requires a proxy to access external services, use only an organization-approved proxy address and set environment variables such as HTTP_PROXY and HTTPS_PROXY in the current terminal. System proxy settings and terminal environment variables are separate configurations. A system proxy may be enabled without being available to terminal processes.

After installation, close the terminal and open a new window before running the version command again. This helps confirm that updated PATH settings have taken effect.

4. Account and Subscription Setup

The tool generally requires an account. Free accounts may have limits on usage, response speed, and context length. If you plan to use the tool regularly in real projects, consider a paid plan that matches your needs.

4.1 Creating an Account

Use an email address that you can access reliably over the long term. If phone verification is required, use your own phone number. Avoid temporary-number platforms and phone verification services. These practices may violate the provider’s terms, lead to account suspension, and expose personal information.

The registration process generally involves opening the official website, choosing email registration or a third-party sign-in option, and completing the requested verification steps. If phone verification is not required, continue with the available registration flow.

4.2 Subscribing to a Paid Plan

Use only the payment methods listed on the provider’s official pricing or billing page. If payment fails, troubleshoot in the following order:

1. Confirm that your card supports international or online payments, and that the currency and billing address match the card information.
2. Complete any SMS or in-app security verification requested by the card issuer.
3. Review the account’s billing history to check for failed, incorrect, or duplicate charges.
4. If the problem persists, contact official support and provide the payment time, error message, and account email address.

Do not purchase cards or codes from unknown sources, and do not use virtual card services to bypass payment restrictions. These actions may violate the terms of service and create account or financial security risks. If personal payment methods are not suitable, ask about official team or enterprise plans that allow an organization to handle payment.

After upgrading, open the account settings page and verify the plan status. Changes may take several minutes to appear. If the status does not update after an extended period, sign out and sign in again.

When you run the tool for the first time, a browser window will open for authorization. After authorization is complete, the terminal should return to the interactive interface. If you use a usage-based API key, store it in an environment variable or a system credential manager. Do not hard-code it in project files or commit it to a repository.

5. Launching the Tool for the First Time

Change to your project directory and run the startup command:

cd your-project
claude

During the first session, perform two checks. First, send a simple question to confirm that the model responds normally without network errors. Second, understand the tool’s permission prompts. The tool will typically ask for confirmation before reading or writing files or executing commands. Review each request carefully before allowing it.

To reduce the risk of unintended changes, test the tool in a version-controlled repository first. This allows you to inspect and revert changes through version history. Do not grant write access directly in an unbacked-up production directory.

6. Common Troubleshooting Issues

The table below summarizes four common issues, their possible causes, verification methods, and recommended actions.

Symptom	Possible cause	Verification method	Recommended action
Command not found	The global installation directory is not in PATH, or the terminal has not reloaded its configuration	Run npm config get prefix and check whether its bin directory is included in PATH	Update the shell configuration file or system environment variables, then reopen the terminal
Installation fails or script execution is blocked	The Node.js version is unsupported, or PowerShell execution policy is restricting scripts	Run node --version and Get-ExecutionPolicy -List	Upgrade Node.js, use claude.cmd, or adjust the policy according to organizational requirements
Frequent timeouts or connection failures	Unstable network, proxy unavailable to the terminal, or corporate network restrictions	Open the official site in a browser and check proxy environment variables in the terminal	Use an organization-approved proxy or ask the network administrator to allow the required domains
Login failure or incorrect subscription status	Expired authorization, an account issue, or a plan that has not taken effect	Check the plan status and billing history in account settings	Sign out and sign in again; if the issue remains, contact official support

If the tool reports that you have reached a usage limit, the current billing period has reached its allowance. Adjust task size as needed or wait for the usage period to reset.

7. Summary

The overall process is straightforward: confirm network and payment requirements, install the tool through the officially recommended method, create and configure an account, and complete the initial verification after launching it. Because each stage can fail for different reasons, checking the steps in order usually makes troubleshooting faster.

AI coding assistants can save time in frequent tasks such as code comprehension, refactoring, and debugging. The actual benefit depends on project size and usage patterns, so start with smaller tasks before deciding whether a long-term subscription is appropriate.