Claude Code tools: From Anthropic

Anthropic's official repository for Agent Skills — the SKILL.md format, a skill template, and example skills, the same format Claude Code loads natively.

Anthropic's foundational taxonomy of agent patterns — prompt chaining, routing, orchestrator-workers, and evaluator-optimizer — and when to use each.

Anthropic's canonical guide to working effectively with Claude Code: the agentic-loop mental model, CLAUDE.md guidance, and workflow patterns.

Anthropic's official Claude Code cheatsheet — a quick reference for the core vocabulary (session, context window, CLAUDE.md), built-in slash commands, and keyboard shortcuts.

The official GitHub Action for running Claude Code in CI: mention @claude in issues and pull requests to delegate code changes, reviews, and fixes.

An official AI-powered security-review GitHub Action that uses Claude to analyze pull-request diffs for vulnerabilities.

Anthropic's guide to curating the context window — compaction, just-in-time retrieval, and note-taking — the discipline underlying effective long-horizon agent use.

A practical account of orchestrator and subagent coordination, prompt design, and evaluation that maps directly to Claude Code's subagents and agent teams.

Anthropic's official, curated directory of high-quality Claude Code plugins, installable from within Claude Code.

A framework for choosing which extension mechanism to reach for, organized around deterministic-versus-probabilistic control and context isolation.