Claude for developers: coding, the API, MCP and code review

Claude Code: coding in the terminal

Claude Code is Anthropic's command-line tool. It works inside your repository: it reads files, understands the architecture, proposes and applies changes, runs tests and commands. Instead of copy-pasting code into a chat window, you keep the work in your real project, with the context of neighbouring files. It is especially effective for multi-file tasks: adding a feature, refactoring, fixing a bug by following the call stack. As with any assistant, review the diffs before committing: Claude Code proposes, you decide what goes into the commit.

The Anthropic API: building Claude into your apps

The API lets you call Claude from your own applications and services, billed per usage (per token, input and output). You pick the model based on the quality/cost/latency trade-off: fast tiers suit high volume and simple tasks, top-end models suit complex reasoning. The API supports response streaming, tool use so Claude can trigger your functions, and prompt caching to cut costs on repeated context. Check the official docs on anthropic.com for up-to-date model IDs and parameters, which change regularly.

MCP: connecting Claude to your tools

The Model Context Protocol (MCP) is an open standard that lets Claude talk to external data sources and tools: a database, a file system, an internal API, a third-party service. Instead of coding a bespoke integration for each case, you expose an MCP server that Claude can use in a uniform way. This is what turns the assistant into an agent able to act on your real environment. Many MCP servers already exist, and you can write your own for your systems.

Code review and good practices

Claude is useful for reviewing code: spotting potential bugs, security issues, unhandled edge cases, or simply clarifying obscure logic. Give it the diff or the relevant files and say what you are after (security, performance, readability). Stay in charge of decisions: an assistant can be wrong, flag false positives or miss business context. Treat its feedback like that of a capable but fallible colleague. To follow new models, Claude Code capabilities and API announcements, the Claude News feed keeps developer-side updates current.

What is the difference between Claude Code and the API?

Claude Code is a ready-to-use command-line tool that works directly in your repository (read, edit, test). The API is a programmatic interface to embed Claude in your own applications, billed per token. Claude Code is for the developer at their machine; the API is for your products and automations.

Can Claude Code edit my files on its own?

Claude Code proposes changes and can apply them, but you stay in control: review the diffs before committing. It is an assistant acting inside your project, not an autopilot. Keep your code under version control (git) so you can roll back at any time.

What is MCP and what is it for?

MCP (Model Context Protocol) is an open standard for connecting Claude to external tools and data (databases, files, APIs). It avoids recoding an integration per case: you expose an MCP server that Claude uses uniformly, turning it into an agent able to act on your systems.

Which Claude model should I use for coding?

It depends on the task and your budget: top-end models excel at complex reasoning and large refactors, faster tiers suit volume and latency. Compare on your own codebase; up-to-date IDs and characteristics are on anthropic.com.