| title | Week 17 · April 20–24, 2026 |
|---|---|
| source | https://code.claude.com/docs/en/whats-new/2026-w17 |
| category | code |
| generated | true |
Fetch the complete documentation index at: https://code.claude.com/docs/llms.txt Use this file to discover all available pages before exploring further.
/ultrareview opens as a research preview, automatic session recaps when you return to a terminal, custom color themes you can build and ship in plugins, and a redesigned Claude Code on the web.
Now in public research preview. Ultrareview runs a fleet of bug-hunting agents in the cloud against your branch or a PR, and findings land back in the CLI or Desktop automatically. Run it before merging critical changes such as auth or data migrations.
Switch focus away from a session and come back to a one-line recap of what happened while you were gone. Helpful for staying in flow while running several Claude sessions at once.
Build and switch between named color themes from /theme, or hand-edit JSON files in \~/.claude/themes/. Each theme picks a base preset and overrides only the tokens you care about. Plugins can ship themes too.
Open the theme picker and create a new one:
> /theme
A new look for claude.ai/code that matches the redesigned desktop app: sessions sidebar, drag-and-drop layout, and a refreshed routines view. Key parts were rebuilt for quicker responses and a more reliable experience.
Other wins
v for character selection or V for line selection in the prompt input, with operators and visual feedbacktype: "mcp\_tool", so a hook can hit an already-connected server without spawning a process/cost and /stats are merged into /usage; the old names still work as typing shortcuts that open the relevant tab/config changes (theme, editor mode, verbose, and similar) now persist to \~/.claude/settings.json and follow the same project/local/policy precedence as other settingsCLAUDE\_CODE\_FORK\_SUBAGENT=1: a fork inherits your full conversation context instead of starting freshhigh (was medium)Glob and Grep tools with embedded bfs and ugrep available through Bash, for faster searches without a separate tool round-trip--from-pr now accepts GitLab merge request, Bitbucket pull request, and GitHub Enterprise PR URLs in addition to github.com"\$defaults" in autoMode.allow, soft\_deny, or environment to add custom rules alongside the built-in list instead of replacing itclaude plugin tag command creates release git tags for plugins with version validation/context percentages and premature autocompaction/resume on large sessions is up to 67% faster and now offers to summarize stale, large sessions before re-reading them