Everything Claude Code: The Complete Resource Guide (2026)
Every Claude Code feature, skill, and resource in one place. Plan Mode, Channels, hooks, subagents, background agents, and the best skills to install first.
Every Claude Code feature, skill, and resource in one place. Plan Mode, Channels, hooks, subagents, background agents, and the best skills to install first.
Quick Answer: Claude Code is Anthropic's terminal-based AI coding agent. It reads your codebase, writes code, runs commands, and manages git. Key features: Plan Mode (read-only planning), Channels (Telegram/Discord messaging), hooks (event-driven automation), subagents (parallel execution), and SKILL.md support (install skills from Agensi for code review, testing, git automation, and more).
Getting started
Claude Code runs in your terminal. It needs a claude.ai Pro or Max subscription. Install with npm install -g @anthropic-ai/claude-code and run claude to start a session.
For a step-by-step setup guide, read How to Install Skills in Claude Code.
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Plan Mode
Plan Mode is a read-only state where Claude analyzes your codebase and proposes a plan before writing code. All write tools are blocked until you approve.
Activate with Shift+Tab (press twice), type /plan, or start with claude --permission-mode plan.
Use it for multi-file refactors, schema changes, and unfamiliar codebases. Skip it for single-file edits and trivial fixes.
Full guide: Claude Code Plan Mode.
Channels
Channels connect your running Claude Code session to Telegram, Discord, and iMessage. Send tasks from your phone, get results in the same chat. Launched March 2026.
Full guide: Claude Code Channels.
Hooks
Hooks are event-driven scripts that run automatically at specific points in the Claude Code lifecycle. afterWrite triggers after Claude writes a file. afterTask triggers after a task completes. Use them for auto-formatting, auto-testing, notifications, and custom workflows.
Full guide: Claude Code Hooks.
Subagents and agent teams
Subagents let Claude delegate tasks to parallel agents. Each subagent runs in its own context with its own permissions. Use them for large refactors where different parts of the codebase can be worked on simultaneously.
Agent teams coordinate multiple subagents working on related tasks. The main session plans, delegates, and merges.
Full guide: Claude Code Agent Teams.
Background agents
Background agents run Claude Code sessions that persist after you close the terminal. They execute tasks autonomously and report back when done. Useful for long-running tasks like test suites, migrations, and code generation.
Full guide: Claude Code Background Agents.
CLAUDE.md
CLAUDE.md is a project-level configuration file that tells Claude Code about your codebase. Conventions, architecture decisions, preferred patterns, team standards. Claude reads it at session startup.
Full guide: Andrej Karpathy's CLAUDE.md.
Best skills to install first
Skills improve Claude Code by giving it specific conventions and patterns for common tasks. The most installed skills on Agensi:
code-reviewer (764 installs) reviews code for bugs, security, and style. Free.
git-commit-writer (232 installs) writes conventional commit messages. Free.
readme-generator (117 installs) generates complete README files. Free.
env-doctor (86 installs) diagnoses startup issues. Free.
pr-description-writer (85 installs) generates PR descriptions. Free.
Browse all Claude Code skills on Agensi.
Best skill combinations
Skills work best in combinations. A typical Claude Code setup:
code-reviewer + git-commit-writer + pr-description-writer covers the full commit-to-PR workflow.
code-reviewer + env-doctor + truth-first covers quality, debugging, and verification.
Full guide: Best Claude Code Skill Combinations.
How to install skills
Drop skills into ~/.claude/skills/:
~/.claude/skills/
├── code-reviewer/
│ └── SKILL.md
├── git-commit-writer/
│ └── SKILL.md
Claude loads skills at session startup. No restart needed if the session is already running.
Full guide: How to Install Skills in Claude Code.
Claude Code comparisons
Claude Code vs Cursor: Full comparison.
Claude Code vs OpenClaw: Full comparison.
Claude Cowork vs Claude Code: Full comparison.
Frequently Asked Questions
What is Claude Code?
Claude Code is Anthropic's terminal-based AI coding agent. It reads your codebase, writes code, runs commands, and manages git. It supports SKILL.md skills for customization.
Is Claude Code free?
Claude Code requires a claude.ai Pro ($20/month) or Max ($100/month) subscription.
What are the most important Claude Code features in 2026?
Plan Mode for safe refactoring, Channels for mobile access, hooks for automation, subagents for parallel execution, and SKILL.md skills for customization.
How many skills are available for Claude Code?
Over 2,000 skills are available on Agensi as of July 2026, covering code review, testing, git, documentation, frontend, DevOps, and more.
Can I use Claude Code skills in other agents?
Yes. SKILL.md is an open standard. Skills work in Claude Code, Cursor, OpenClaw, Codex CLI, Gemini CLI, Roo Code, and 20+ other agents.
What is the best skill for Claude Code beginners?
code-reviewer is the most impactful first install. It provides structured code review that catches bugs and security issues you would otherwise miss.