Summary
Claude Code is Anthropic's coding agent, built on the Claude family of large language models. It operates directly in a developer's terminal and codebase—reading files, editing code, running commands, and using external tools—to carry out multi-step engineering tasks rather than just suggesting snippets.
What is Claude Code?
Claude Code is an agentic command-line tool: given a goal, it plans the work, makes changes across files, runs tests and build commands, and iterates based on the results. It connects to external systems through the Model Context Protocol (MCP), and its behaviour can be shaped through hooks, permission modes, and project-level instruction files.
A graduated permission system governs what the agent may do autonomously versus what requires confirmation, ranging from prompting on every edit to broader auto-accept modes. More advanced workflows allow a lead session to break a task into subtasks and coordinate several parallel agent sessions. As with any AI coding tool, output quality depends heavily on how the surrounding harness—instructions, context, and verification steps—is designed.
Claude Code is one example of a broader shift toward "harness engineering": the discipline of structuring context, tools, and guardrails so that AI agents produce reliable results.
Why is Claude Code relevant?
- Agentic workflow: Executes multi-step tasks end to end—editing, running, and verifying—rather than only completing code
- Tool integration: Uses MCP to reach external data sources, services, and internal systems
- Configurable guardrails: Permission modes and hooks keep autonomous changes under human control
- Representative of the category: Illustrates how modern coding agents work and where the engineering effort really lies