Claude Code Guide 2026: 25 Features with Examples + Demo

Claude Code started as a terminal coding assistant. It now runs as a layered agentic system. Underneath, Claude Code separates memory, hooks, skills, subagents, plugins, and MCP into distinct layers. Each layer changes what the model can see or do.

This article covers 25 features and strategies for scaling Claude Code. It is written for AI engineers, software engineers, and data scientists. Every code example follows a documented format and runs as written. Each item is labeled by status, so you know what ships with Claude Code and what does not.

What is Claude Code

Claude Code is Anthropic’s agentic coding tool. It works in the terminal, the desktop app, and your IDE. It can read files, run commands, edit code, and call external tools. Under the hood, it runs an agentic loop. That loop chooses tools, accumulates context, and manages long sessions through compaction.

Safety boundaries come from permission modes, checkpoints, sandboxing, and managed settings. The same loop is exposed programmatically through the Agent SDK. Developers extend the tool with a small set of primitives. Those primitives are CLAUDE.md, skills, subagents, slash commands, hooks, and MCP servers. Plugins bundle these primitives into one installable unit.

The 25 Features and Strategies

Each feature/strategy is labeled. ‘Official’ means documented Anthropic functionality. ‘Community technique’ means a workflow pattern, not a shipped feature. ‘Third-party tool’ means software built outside Anthropic.

1. CLAUDE.md memory file (Official). This file is the agent’s constitution for your repository. Claude reads it every session to anchor conventions and commands.
2. Skills (Official). A skill is a SKILL.md file with frontmatter under .claude/skills/<name>/. It supports /name invocation and autonomous invocation by Claude.
3. Subagents (Official). Subagents are specialized instances with their own context windows. Verbose work stays isolated, so your main conversation stays focused.
4. Slash commands (Official). These are typed shortcuts starting with /. Built-ins include /init, /compact, /context, /review, and /security-review.
5. Hooks (Official). Hooks are deterministic scripts that fire at defined lifecycle points. PreToolUse is the primary security checkpoint before any tool runs.
6. MCP servers (Official). Model Context Protocol connects Claude Code to GitHub, databases, and browsers. The server handles integration; Claude reasons about what to do.
7. Plugins (Official). A plugin is a versioned bundle of skills, subagents, commands, hooks, and MCP definitions. One /plugin command installs the whole set.
8. Checkpoints (Official). Claude Code snapshots state automatically before changes. Press Escape twice to rewind when something breaks.
9. Plan mode (Official). Plan mode explores and proposes without executing. It is ideal for scoping work before committing edits.
10. Permission modes (Official). Default mode asks before each file write and shell command. Other modes trade oversight for speed.
11. Auto Mode (Official, research preview). A separate Sonnet 4.6 classifier reviews each action first. Safe actions proceed; risky ones get blocked or escalated.
12. Context compaction (Official). /compact condenses long sessions to preserve usable context. /context reports current context usage.
13. Background tasks (Official). Long shell commands run with the run_in_background flag on the Bash tool. Claude polls output without blocking the conversation.
14. Agent SDK (Official). The SDK exposes the same loop programmatically through query(). You can send slash commands like /code-review and process results.
15. Headless CLI (Official). claude -p "query" runs a one-shot process and exits. Piped input like cat logs.txt | claude -p also works.
16. GitHub Action and scheduled jobs (Official). Claude Code runs as a one-shot process without a TTY. This enables CI integration, scheduled jobs, and pre-commit hooks.
17. Output styles and statusLine (Official). Output styles change response formatting. A custom statusLine renderer surfaces session state in the terminal.
18. Remote Control and mobile push (Official). You can drive Claude Code from mobile or web surfaces. Claude can send push notifications when tasks finish.
19. Away summary (Official). This session-level feature surfaces context when you return to a paused session. It is enabled by default and can be opted out.
20. Sandboxing (Official). The sandboxed Bash tool enforces OS-level filesystem and network isolation. Commands run without prompts inside boundaries you define.
21. Structured context folders (Community technique). Organize task-specific folders for brand guidelines, client data, or legal terminology. The right context loads for each task, improving output relevance.
22. Dynamic workflows (Community technique). Break complex tasks into smaller steps using sub-agents. Common patterns include ‘classify and act’ and ‘fan out and synthesize.’
23. Modular skill pipelines (Community technique). Chain reusable skills into end-to-end workflows. A support pipeline can combine categorization, response generation, and escalation skills.
24. External memory layers (Third-party tool). Tools such as Mem Search or Hermes extend recall across long projects. They sit outside Claude Code’s built-in memory.
25. Resilience techniques (Community technique). Practitioners reset and retry tasks when output quality degrades. This avoids context pollution and keeps results consistent.

Try the Interactive Demo