--- title: "Claude Code Cheat Sheet — June 2026: Fable 5, Opus 4.8, Agent View, and Dynamic Workflows" description: "June 2026 Claude Code cheat sheet (v2.1.170): 65+ slash commands, 70+ flags, 27 hook events, Opus 4.8, Fable 5, Agent View and dynamic workflows." url: "https://angelo-lima.fr/en/claude-code-cheatsheet-june-2026-update/" lang: "en" author: "Angelo Lima" datePublished: "2026-06-15T12:00:00.000Z" dateModified: "2026-10-29T12:00:00.000Z" tags: ["IA","Development","Claude Code"] translation: "https://angelo-lima.fr/fr/claude-code-cheatsheet-juin-2026-mise-a-jour/" --- # Claude Code Cheat Sheet — June 2026: Fable 5, Opus 4.8, Agent View, and Dynamic Workflows *Exhaustive up-to-date reference for Claude Code v2.1.170 — June 2026* **⚠ Update (June 12, 2026):** Fable 5 and Mythos 5 were suspended globally by US government order four days after their launch. All other models remain available. Fable 5 entries in the cheat sheet are preserved for reference, marked as suspended. --- I republished [a Claude Code cheatsheet at the end of April](https://angelo-lima.fr/en/claude-code-cheatsheet-april-2026-update/). Seven weeks later it has aged a lot: between v2.1.101 and v2.1.170, Anthropic shipped roughly sixty releases. **Two new models** landed (Opus 4.8 on May 28, then Fable 5 on June 9), the **Agent View** arrived, **dynamic workflows** now orchestrate hundreds of subagents, and a handful of new commands (`/goal`, `/cd`, `/workflows`, `/ultrareview`, `/reload-skills`…) showed up. So I republished a June 2026 edition — **same visual architecture** as the March and April versions, rewritten to match every addition, using **the blog palette** (dark background, gold accent). > **In brief** > > - **What:** an interactive HTML cheat sheet for Claude Code v2.1.170, in English and French, updated in June 2026. > - **Coverage:** 16 sections, 65+ slash commands, 70+ flags and environment variables, 27 hook events. > - **New since April:** Opus 4.8 (May 28), Fable 5 (June 9, since suspended), Agent View, dynamic workflows and the security-guidance plugin. > - **Latest edition:** [the October 2026 cheat sheet](https://angelo-lima.fr/en/claude-code-cheatsheet-october-2026-state-of-play-en/). ## The cheat sheet - **[English — Interactive HTML](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-june-2026-en.html)** - **[French — Interactive HTML](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-juin-2026.html)** The previous editions stay available: April [EN](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-april-2026-en.html) · [FR](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-avril-2026.html), March [EN](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-2026-en.html) · [FR](https://angelo-lima.fr/assets/data/claude-code-cheatsheet-2026.html). Items with a gold **NEW** badge shipped since the April 2026 edition. ## What's covered 16 sections (two new cards: Agent View, and Dynamic Workflows & Security): | Section | Coverage | |---------|----------| | Keyboard Shortcuts | ~30 shortcuts, transcript navigation, Vim mode | | Slash Commands | **65+ commands** in 6 categories | | CLI Flags & Subcommands | 70+ flags in 9 categories, `claude agents` | | The Big 5 (Extension System) | CLAUDE.md, Rules, Commands, Skills, Subagents, MCP, Plugins | | Permission Modes | 6 modes + June hardening (startup files, build configs) | | Hooks | **27 events**, 5 handlers, `MessageDisplay`, `args[]` | | Input Superpowers | @mentions, !shell, pipes, worktrees, `--bg --exec` | | Configuration | 5-level hierarchy, env vars, settings.json | | File Structure Map | Project + global tree | | Rewind & Checkpoints | Rewind options + "Summarize up to here" | | Auto Mode | Classifier, GA on Pro, hard deny, Bedrock/Vertex/Foundry | | **Models & Effort Levels** | Fable 5, Opus 4.8/4.7, Sonnet 4.6, Haiku 4.5 + `ultracode` | | Platforms | CLI (Windows without Git Bash), Desktop, Web (Routines), IDE | | **Agent View** | `claude agents`, pinned sessions, background exec | | **Dynamic Workflows & Security** | `/workflows`, security-guidance plugin, `/ultrareview` | | Pro Workflow | Plan → Execute, `/goal`, fallback chains, safe mode | | Customize Claude Code | Full frontmatter + plugin scaffolding | | Quick Reference | Combos refreshed with June additions | ## Additions and changes since April 2026 ### Claude Opus 4.8 (May 28) The new default model on Max, Team Premium, Enterprise pay-as-you-go, and the Anthropic API (requires v2.1.154+). Default `high` effort, `xhigh` for the hardest tasks, native 1M context. **Fast mode** now runs on Opus 4.8 at $10/$50 per MTok (2x the standard rate for ~2.5x the speed); Opus 4.6 fast mode is deprecated. ### Claude Fable 5 (June 9) The **Mythos-class** model, the most capable available in Claude Code: 1M context, up to 128K output tokens, $10/$50 per MTok. Built for tasks larger than a single sitting — it sustains long autonomous sessions, investigates before acting, and verifies its own work. It is **not** the default model: `/model fable` (or the `best` alias). Thinking is always on there and can't be disabled. One important quirk: Fable 5 runs with **safety classifiers** (cybersecurity, biology). A flagged request automatically reroutes to Opus (4.8 on the API, 4.7 on AWS) with a notice in the transcript. To check whether a customization (CLAUDE.md, a security repo…) trips the fallback on the very first request, launch `claude --safe-mode`. ### Agent View (`claude agents`, May 11) The big UX feature: a **single screen for all your sessions** — what's running, what's blocked on you, what's done. `claude agents` or `←←` from a session. "Pinned" background sessions stay alive when idle, `/resume` lists them with their elapsed duration, and `claude --bg --exec "pytest -x"` launches an attachable shell job. ### Dynamic workflows & ultracode (May 28) A **workflow** is an orchestration script Claude writes for your task and runs across dozens to hundreds of subagents in the background — ideal for a codebase-wide audit or a large migration. Manage them with `/workflows`, and trigger them via the `ultracode` effort level (xhigh + auto orchestration) or the `ultracode` keyword (the former `workflow`, renamed early June). ### The security-guidance plugin (May 28) An official plugin that reviews Claude's changes for vulnerabilities and fixes them in the same session: a fast pattern check on each edit, a model review at the end of each turn, a deeper agentic review on commit/push. `/plugin install security-guidance@claude-plugins-official` then `/reload-plugins`. Project rules in `.claude/claude-security-guidance.md`. ### New slash commands `/goal` (set a completion condition, Claude iterates until it holds), `/cd` (change cwd without breaking the prompt cache), `/scroll-speed`, `/workflows`, `/reload-skills`, `/ultrareview` (fleet of cloud bug-hunting agents), `/web-setup`. The `/code-review` (correctness bugs, `--comment`/`--fix`) and `/simplify` (cleanup-only review that applies fixes) pair was re-split. ### Auto Mode GA on Pro The permission classifier now runs on **Pro** (with Sonnet 4.6 or Opus) and no longer requires opt-in consent. New: `autoMode.hard_deny` for rules that block unconditionally, and availability on Bedrock/Vertex/Foundry via `CLAUDE_CODE_ENABLE_AUTO_MODE=1`. ### 27th hook event + refinements New `MessageDisplay` event (transform/hide displayed text). Plus: `Stop`/`SubagentStop` can return `additionalContext`, `command` hooks accept an exec form `args: string[]` (no more quote escaping), `PostToolUse` gains `continueOnBlock`, `SessionStart` can return `reloadSkills: true`, and `$CLAUDE_EFFORT` / `effort.level` are visible to hooks. ### Fallback chains, safe mode & version gating `--fallback-model` now accepts a **chain** (up to 3 models, comma-separated) and applies in interactive sessions too; persist it via `fallbackModel` (array) in settings. `--safe-mode` (and `CLAUDE_CODE_SAFE_MODE`) disables all customizations for debugging. Admins can enforce `requiredMinimumVersion` / `requiredMaximumVersion`, `availableModels` + `enforceAvailableModels`, and `modelOverrides`. ### Platforms **Windows without Git Bash** (PowerShell becomes the default shell when Bash is absent). **Routines** on Claude Code on the web (templated cloud agents fired by schedule, GitHub event, or API), mobile push notifications, custom themes, session recap. On the IDE side, Windsurf was renamed **Devin Desktop**. ### Defaults that flipped - **Opus 4.8** default on Max / Team Premium / Enterprise pay-as-you-go / API - **Sonnet 4.6** on Pro / Team Standard / Enterprise subscription seats - **Opus 4.7** on Claude Platform on AWS (xhigh by default) - **Fable 5** never default (`/model fable`) - **Lean system prompt** by default for all models except Haiku / Sonnet / Opus 4.7 and earlier - **Auto mode** with no opt-in --- Official sources: [Claude Code Changelog](https://code.claude.com/docs/en/changelog), [What's New](https://code.claude.com/docs/en/whats-new), [Model configuration](https://code.claude.com/docs/en/model-config), [Dynamic workflows](https://code.claude.com/docs/en/workflows), [Security guidance](https://code.claude.com/docs/en/security-guidance), [Introducing Fable 5 & Mythos 5](https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5). If you spot an error or a missing feature, please reach out. I'll keep this cheatsheet updated as Claude Code evolves. ## Frequently asked questions ### What is the June 2026 Claude Code cheat sheet? It is a free interactive HTML reference, in English and French, covering Claude Code v2.1.170: 65+ slash commands, 70+ CLI flags and environment variables, 27 hook events, models, permissions and configuration. A newer edition was published in October 2026. ### What's new in Claude Code in June 2026? Between late April and June 2026, Claude Code went from v2.1.101 to v2.1.170. The main additions are Opus 4.8 (May 28), Fable 5 (June 9), Agent View (`claude agents`), dynamic workflows that orchestrate hundreds of subagents, the security-guidance plugin, and the `/goal`, `/cd` and `/ultrareview` commands. ### What is Claude Code's Agent View? Agent View, added to Claude Code on May 11, 2026, shows every session on a single screen: what is running, what is waiting for your answer and what is done. You open it with `claude agents`, or with `←←` from inside a session. ### What are Claude Code dynamic workflows? A dynamic workflow is an orchestration script that Claude writes for a task and runs across dozens to hundreds of background subagents, for example to audit a whole repository or carry out a large migration. You manage them with `/workflows` and trigger them with the `ultracode` effort level. ### Why is Fable 5 marked as suspended? Fable 5 and Mythos 5 were suspended worldwide by US government order a few days after their June 9, 2026 launch. All other models, including Opus 4.8, remain available, and the cheat sheet keeps its Fable 5 entries for reference.