What Is Claude Code: Features, Agent Swarms and How It Works

Claude Code is Anthropic's AI coding tool that runs directly in your terminal and IDE, handling complex software tasks through nested agent swarms. Unlike chat-based AI assistants, Claude Code executes shell commands, reads files, and manages multi-step workflows autonomously. Anthropic ships updates weekly, with recent releases adding sub-agent spawning, a safe mode for troubleshooting, and multi-fallback model support. This piece breaks down what Claude Code is, what it can do, and what the latest features mean for developers in 2026.

Recent additions aim to streamline interactions and boost productivity. For instance, the ability to move the current session to a new working directory mid-conversation without rebuilding the prompt cache, introduced in Week 24, directly addresses a common developer pain point.

Deeper Agent Integration and Control

Sub-agents can now spawn their own sub-agents, with background chains capped at five levels deep, enabling more complex, nested autonomous tasks. This enhanced hierarchical capability allows for more sophisticated automation.

Furthermore, a new safe mode, activated via --safe-mode, disables all customizations for easier troubleshooting. The fallbackModel configuration allows for up to three sequential model fallbacks, increasing resilience.

Expanding Platform and Safety Features

Auto mode, a key feature for reducing permission prompts, is now available on third-party providers like Bedrock, Vertex, and Foundry for Opus 4.7 and 4.8 models. This expands its utility beyond Anthropic's own platform.

Safety is also being bolstered with features like safer automatic edits, which prompt before writing files that can execute code. The /plugin list command now displays installed plugins inline, and managed deployments can enforce specific Claude Code version ranges.

Claude Opus 4.8 has become the default model for several premium tiers, including Max, Team Premium, and Enterprise pay-as-you-go accounts. This new default model offers a high effort setting by default, with an option for even higher effort tasks via /effort xhigh. Developers can explore the capabilities of this new model in the Claude Code Embraces Opus 4.8 update.

Dynamic workflows, capable of orchestrating dozens to hundreds of subagents from a script written by Claude, are also being introduced. The security-guidance plugin offers real-time vulnerability reviews of Claude’s code changes.

Developer Experience Enhancements

The introduction of the Agent view in Week 20 provides a unified screen for each Claude Code session, clearly showing active tasks, pending approvals, and completed actions.

Plugins can now be loaded from .zip archives and URLs, offering more flexibility in managing and integrating external tools. Windows users will appreciate the removal of the Git Bash dependency, with Claude Code now utilizing PowerShell as its default shell.

A public research preview of /ultrareview brings cloud-based bug-hunting agents directly to the CLI or Desktop, with findings automatically integrated.

The platform continues to evolve with features like the Monitor tool for live log tailing and reaction, and /autofix-pr for automated pull request fixes directly from the terminal.

Computer use, a research preview feature, now extends to the CLI, enabling Claude to interact with native applications and user interfaces directly from the terminal.

Auto mode, now in research preview, intelligently handles permission prompts, allowing safe actions to proceed uninterrupted while blocking risky ones.