3 ファイル変更 +139 -0
この更新の概要
Claude Opus 4.8が新たにデフォルトモデルとして導入され、最大・エンタープライズプラン等で利用可能になりました。大規模なタスクを自動化する動的ワークフロー機能や、脆弱性を自動検知・修正するセキュリティガイダンスプラグインが追加されています。Proプラン向けにはバックグラウンドでの安全性チェックを行う自動モードが提供され、Sonnet 4.6もサポートされました。/usageコマンドによるリソース消費の詳細内訳表示や、GitHub連携も可能な/code-reviewコマンドなどの新機能が実装されています。
Proプランでの自動モード開放、リソース消費内訳を表示する/usageコマンドの強化、およびバグ修正を行う/code-reviewコマンドの追加について解説されています。
@@ -0,0 +1,41 @@
---
title: 2026-w21
source: https://code.claude.com/docs/en/whats-new/2026-w21.md
---
# Week 21 · May 18–22, 2026
> Use auto mode on the Pro plan and with Sonnet 4.6, see which skills, subagents, and MCP servers drive your plan limits in /usage, and review diffs with the new /code-review command.
Releases v2.1.143 → v2.1.149
1 feature · May 18–22
Auto mode on the Pro plan
CLI
Auto mode is now available on the Pro plan and supports Sonnet 4.6 alongside Opus. It replaces permission prompts with background safety checks: routine actions run without interrupting you, and destructive or suspicious ones are blocked and surfaced.
Update Claude Code, then cycle modes with Shift+Tab; auto mode appears once your account meets the requirements:
```bash terminal theme={null}
claude update
```
Auto mode
Other wins
/usage now shows a per-category breakdown of what's driving your plan limits, attributing recent usage to skills, subagents, plugins, and individual MCP servers
"Extra usage" is renamed to "usage credits" across the CLI, and /extra-usage is now /usage-credits. The old name still works.
New /code-review command reports correctness bugs at a chosen effort level such as /code-review high, and --comment posts findings as inline GitHub PR comments. /simplify remains as a separate cleanup-only review.
Background sessions now appear in /resume alongside interactive ones, marked with bg, and sessions pinned with Ctrl+T in claude agents stay alive when idle
claude agents --json lists live sessions as JSON for scripting, such as status bars and session pickers
The PowerShell tool is now enabled by default on Windows for Bedrock, Vertex, and Foundry users; opt out with CLAUDE\_CODE\_USE\_POWERSHELL\_TOOL=0
claude plugin disable now refuses when another enabled plugin depends on the target, and claude plugin enable force-enables transitive dependencies
The /plugin marketplace browse pane shows projected context cost, and the Discover and Browse screens list a plugin's commands, agents, skills, hooks, and MCP/LSP servers before installation
New worktree.bgIsolation: "none" setting lets background sessions edit the working copy directly without EnterWorktree, for repos where worktrees are impractical
Markdown output renders GFM task list checkboxes, and the /diff detail view scrolls with the keyboard
Status line JSON input now includes GitHub repo and PR information when detected
Enterprise: the allowAllClaudeAiMcps managed setting loads claude.ai cloud MCP connectors alongside managed-mcp.json
[Full changelog for v2.1.143–v2.1.149 →](/en/changelog#2-1-143)
新モデルClaude Opus 4.8の導入、複数エージェントを制御する動的ワークフロー、セキュリティ脆弱性をレビューする専用プラグインなどの新機能が詳述されています。
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---
title: 2026-w22
source: https://code.claude.com/docs/en/whats-new/2026-w22.md
---
# Week 22 · May 25–29, 2026
> Run Claude Code on Claude Opus 4.8, orchestrate large tasks with dynamic workflows, catch security issues with the security-guidance plugin, and use fast mode on Opus 4.8 at a lower price.
Releases v2.1.150 → v2.1.157
4 features · May 25–29
Claude Opus 4.8
new model
Opus 4.8 is now the default on Max, Team Premium, Enterprise pay-as-you-go, and the Anthropic API. It defaults to high effort; use /effort xhigh for harder tasks. Requires v2.1.154 or later.
Switch to Opus 4.8 by name, or pick it from the model picker:
```text Claude Code theme={null}
> /model claude-opus-4-8
```
Model configuration
Dynamic workflows
research preview
A workflow is an orchestration script Claude writes for your task and runs across many subagents in the background. Use one when a task is too large for one conversation to coordinate: a codebase-wide audit, a large migration, a research question that needs cross-checking. Manage runs with /workflows.
Describe the task and include the word workflow:
```text Claude Code theme={null}
> create a workflow that migrates every internal fetch() call to the new HttpClient wrapper
```
Dynamic workflows
Security guidance plugin
plugin
The security-guidance plugin reviews Claude's code changes for vulnerabilities and fixes them in the same session. It runs a fast pattern check on each edit, a model review at the end of each turn, and a deeper agentic review on commit or push. Add project rules in .claude/claude-security-guidance.md.
Install it from the official Anthropic marketplace:
```text Claude Code theme={null}
> /plugin install security-guidance@claude-plugins-official
```
Then activate it in the current session:
```text Claude Code theme={null}
> /reload-plugins
```
Security guidance plugin
Fast mode on Opus 4.8
research preview
Fast mode now defaults to Opus 4.8 at $10/$50 per MTok: 2x the standard rate for about 2.5x the speed. Opus 4.7 and 4.6 stay at $30/$150. Opus 4.6 fast mode is deprecated.
Toggle fast mode, now on Opus 4.8:
```text Claude Code theme={null}
> /fast
```
Fast mode pricing
Other wins
In claude agents, prefix a shell command with ! to run it as a background job you can attach to and detach from; also available as claude --bg --exec 'pytest -x'
Plugins in .claude/skills directories are now loaded automatically, no marketplace required, and claude plugin init \<name> scaffolds a new plugin
New /reload-skills command re-scans skill directories without restarting, and SessionStart hooks can return reloadSkills: true to make skills they install available in the same session
Skills and commands can set disallowed-tools in frontmatter to remove tools from the model while the skill is active
New MessageDisplay hook event lets hooks transform or hide assistant message text as it is displayed
Claude Code now switches to your configured --fallback-model for the rest of the session when the primary model is not found, instead of failing every request
Plugins can declare defaultEnabled: false in plugin.json or a marketplace entry, so they install without turning on until you enable them
Vim mode: / in NORMAL mode opens reverse history search, matching Bash and Zsh vi-mode
Streaming tool execution is now always enabled, including with telemetry disabled and on Bedrock, Vertex, and Foundry
←← to open the agents view now works on Bedrock, Vertex, Foundry, and with telemetry disabled
Claude in Chrome: pick which connected browser to use via /chrome → "Select browser…", or in-chat when a browser action runs with multiple connected
claude mcp list and claude mcp get now show unapproved .mcp.json servers as pending approval instead of auto-approving and connecting when output is piped
[Full changelog for v2.1.150–v2.1.157 →](/en/changelog#2-1-150)
@@ -9,6 +9,18 @@ source: https://code.claude.com/docs/en/whats-new/index.md
The weekly dev digest highlights the features most likely to change how you work. Each entry includes runnable code, a short demo, and a link to the full docs. For every bug fix and minor improvement, see the [changelog](/en/changelog).
**Claude Opus 4.8**: the new default model for Max, Team Premium, Enterprise pay-as-you-go, and Anthropic API accounts, with high effort by default and `/effort xhigh` for the hardest tasks.
Also this week: **dynamic workflows** orchestrate dozens to hundreds of subagents from a script Claude writes; the **security-guidance plugin** reviews Claude's changes for vulnerabilities as it works; and **fast mode** runs on Opus 4.8 at $10/$50 per MTok.
[Read the Week 22 digest →](/en/whats-new/2026-w22)
**Auto mode on the Pro plan**: auto mode now runs on Pro accounts and supports Sonnet 4.6 alongside Opus, replacing permission prompts with background safety checks.
Also this week: **`/usage`** breaks down what drives your plan limits by skill, subagent, plugin, and MCP server; the new **`/code-review`** command reports correctness bugs; and **background sessions** appear in `/resume` and stay alive when pinned.
[Read the Week 21 digest →](/en/whats-new/2026-w21)
**Agent view**: `claude agents` opens one screen for every Claude Code session, showing what's running, what's blocked on you, and what's done.
Also this week: **`/goal`** keeps Claude working across turns until a completion condition holds; **fast mode** now runs on Opus 4.7 by default; and the **Rewind menu** can compress earlier context with "Summarize up to here".