Intelligence Artificielle 10/02/2026 9 min read

Claude Code: the AI that codes inside your terminal

Anthropic's Claude Code reshapes software development with an agentic AI assistant living right inside your terminal. An overview of its features and use cases.

What if your next fellow developer lived inside your terminal? That is exactly the promise of Claude Opus 4.6 et les Agent Teams Code, the agentic coding assistant built by Anthropic. Far from being mere code autocompletion, Claude Code understands your entire codebase, runs commands, handles your Git workflows and debugs your applications, all in natural language. In February 2026, MIT Technology Review even ranked generative coding among the breakthrough technologies of the year. Let's dive into this tool that is redefining the daily lives of developers and system administrators.

What is Claude Code?

Claude Code is a command-line tool (CLI) developed by Anthropic, the company founded by former OpenAI researchers. Unlike coding assistants embedded in an IDE, Claude Code runs straight from your terminal. It is an autonomous agent able to navigate your project, read and write files, run shell commands and interact with your Git repositories.

The tool is powered by Anthropic's most advanced models:

Claude Opus 4.6: the most powerful model, ideal for complex reasoning tasks and software architecture
Claude Sonnet 4.5: an excellent trade-off between performance and speed, perfect for day-to-day development
Claude Haiku 4.5: the fastest model, suited to simple tasks and quick iterations

Claude Code is available with a Claude Pro, Team or Enterprise subscription. It is also accessible through the Anthropic API for integration into your own tools.

Installation and first steps

Installing Claude Code is remarkably simple. All you need is Node.js 18+ on your machine:

# Global install via npm
npm install -g @anthropic-ai/claude-code

# Launch inside your project
cd /path/to/your/project
claude

# Authentication (first run)
# Claude Code will open your browser so you can sign in

Once launched, Claude Code automatically analyses your project structure. It reads configuration files, understands dependencies and adapts to the context of your codebase. You can then talk to it in natural language:

# Examples of natural-language commands
claude "Explain the architecture of this project"
claude "Find and fix the bug in the authentication module"
claude "Write the unit tests for the UserService service"
claude "Refactor this function to follow the SOLID principle"

Key features

Whole-codebase understanding

Claude Code does not just read the open file. It navigates your entire project, understands the relationships between modules, identifies dependencies and grasps the business context. When you ask it to modify a function, it automatically checks the impact on the rest of the code.

This contextual understanding is especially useful for legacy projects or large codebases where documentation is often spotty. Claude Code then becomes a kind of living memory of the project.

Built-in Git workflows

Git integration is one of Claude Code's strong points. It can create commits with relevant messages, manage branches, resolve merge conflicts and even open pull requests on GitHub. For anyone who uses Git every day, that is a considerable time saver:

# Claude Code handles your Git workflows
claude "Create a commit with the current changes"
claude "Create a feature/auth-refactor branch and push it"
claude "Resolve the merge conflicts on the develop branch"
claude "Open a pull request with a summary of the changes"

Writing and debugging code

Claude Code excels at generating quality code. It respects the project's conventions, follows existing patterns and produces idiomatic code. Debugging is just as impressive: describe the symptom and Claude Code will analyse the logs, trace execution and propose a fix.

Running commands

Unlike a classic chatbot, Claude Code can run commands directly in your terminal. It launches your tests, runs your build scripts, starts Docker containers and checks the results. This ability to take action is what makes it a true agent rather than a mere conversational assistant.

What's new in February 2026

Anthropic rolled out several major updates in early 2026 that significantly strengthen Claude Code's capabilities:

The /debug command

The new /debug command lets you launch an interactive debugging session. Claude Code analyses error messages, forms hypotheses, tests fixes and iterates until the problem is solved. It is particularly effective for configuration errors or environment issues.

PDF page-range support

Claude Code can now read PDF files, and you can specify precise page ranges. Ideal for extracting information from technical documentation or large functional specifications without overloading the context.

OAuth for MCP servers

The Model Context Protocol (MCP) lets you extend Claude Code with external data sources. Adding OAuth authentication simplifies connecting to your internal tools: databases, ticketing systems, monitoring platforms. It is an important step forward for enterprise environments.

Fast Mode: 2.5x faster

Fast Mode uses the same Claude Opus 4.6 model but with optimised output, delivering responses up to 2.5 times faster. For iterative tasks such as refactoring or test generation, this speed boost radically changes the user experience. Enable it with a simple /fast.

IDE integrations

Although Claude Code is terminal-native, it integrates seamlessly into modern editors:

VS Code: official extension with a dedicated side panel
Cursor: native integration of the Claude models
Windsurf: full support via the API
JetBrains (IntelliJ, PyCharm, WebStorm): plugin available

These integrations let you combine the power of the terminal with the comfort of a graphical IDE. You keep your shortcuts, your configuration and your habits while benefiting from Claude Code's intelligence.

Use cases for sysadmins and DevOps

Claude Code is not reserved for application developers. System administrators and DevOps engineers will find a valuable ally in it every day.

Infrastructure automation

Writing Ansible playbooks, Terraform files or Kubernetes configurations becomes child's play. Claude Code understands infrastructure-as-code best practices and generates robust configurations:

# Example workflow: Claude Code generates a docker-compose
# after the command "Create a LAMP stack with an Nginx reverse proxy"
services:
  nginx:
    image: nginx:alpine
    ports:
      - "80:80"
      - "443:443"
    volumes:
      - ./nginx/conf.d:/etc/nginx/conf.d
    depends_on:
      - php

  php:
    build: ./php
    volumes:
      - ./app:/var/www/html
    depends_on:
      - mysql

  mysql:
    image: mariadb:11
    environment:
      MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db_root_password
    volumes:
      - db_data:/var/lib/mysql

If you are new to containerisation, check out our Docker tutorial to master the fundamentals before fully leveraging Claude Code in this area.

System and network debugging

When a service goes down in production at 3 a.m., Claude Code can analyse the logs, identify the root cause and propose a fix. It understands systemd logs, network traces and performance metrics:

# Log analysis with Claude Code
claude "Analyse the Nginx logs from the last 24h and identify the 5xx errors"
claude "Why is the PostgreSQL service refusing connections?"
claude "Optimise the sysctl configuration for a high-traffic web server"

CI/CD pipelines

Creating and maintaining continuous integration pipelines is a time-consuming task. Claude Code can generate GitLab CI or GitHub Actions pipelines tailored to your project:

# Example generated by Claude Code for a Python/FastAPI project
stages:
  - test
  - build
  - deploy

test:
  stage: test
  image: python:3.12-slim
  script:
    - pip install -r requirements.txt
    - pytest tests/ --cov=app --cov-report=xml
  artifacts:
    reports:
      coverage_report:
        coverage_format: cobertura
        path: coverage.xml

build:
  stage: build
  image: docker:latest
  services:
    - docker:dind
  script:
    - docker build -t $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA .
    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHA

Administration scripts

Whether it is automating backups, monitoring services or managing SSL certificates, Claude Code produces robust Bash or Python scripts with error handling, logging and notifications. It is particularly effective when combined with a Proxmox environment or Linux servers managed over SSH.

Cross-platform availability

In 2026, Claude is no longer confined to the web browser. Anthropic has rolled out its assistant across several platforms:

Terminal: Claude Code via npm, the native experience for developers
Web: the claude.ai interface for conversations and document analysis
iOS app: Claude in your pocket, handy for code reviews on the go
API: programmatic integration into your own applications

Best practices to get the most out of Claude Code

After several months of intensive use, here are the practices that make the difference:

Be precise in your instructions

The more specific your request, the better the result. Instead of simply asking it to fix a bug, describe the expected behaviour, the observed behaviour and the context in which the error occurs.

Use CLAUDE.md files

Claude Code automatically reads the CLAUDE.md files at the root of your project. This is the ideal place to document your coding conventions, your architecture and your preferences. Claude Code will follow them in all its interactions.

Make use of planning mode

For complex tasks, ask for a plan first before moving on to implementation. Claude Code can lay out the steps, identify the risks and propose several approaches before writing a single line of code.

Warning: Claude Code runs commands in your terminal with your user permissions. Always review critical commands before approving them, especially those involving file deletions or production infrastructure changes.

Manage your context

Claude Code's context has a limited size. For long sessions, use the /clear command regularly to avoid degrading the quality of responses. Favour short, focused sessions over one long, monolithic session.

The future of AI-assisted development

MIT Technology Review ranking generative coding among the 2026 breakthrough technologies is no accident. Claude Code illustrates a deep trend: AI does not replace the developer, it amplifies their capabilities. The developer becomes an architect who designs, supervises and validates while the AI handles the implementation and the repetitive tasks.

For DevOps teams and sysadmins, this shift means less time spent hunting for the right syntax in the documentation and more time devoted to architectural thinking and solving complex problems. Tools like Claude Code, combined with a solid command of Linux, Docker and networking fundamentals, form a formidable productivity kit.

Software development is entering a new era. Claude Code is only the beginning, but it is a particularly impressive one. If you have not tried it yet, install it in your terminal and let yourself be surprised by what an npm install -g @anthropic-ai/claude-code can change in your daily life as a developer.

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Morgann Riu

Cybersecurity and Linux administration expert. I help companies secure and optimize their critical infrastructures.

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