Claude Code Now Ships a Real Code Review Command — Down to PR Comments

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EDIBLOG · AI · CLAUDE CODE

Claude Code now has a real code review command

The old /simplify is now /code-review. It’s not just a rename. The command now goes far enough to post its findings as comments directly on a GitHub PR.

Claude Code 2.1.147 /code-review –comment May 21–22

01 · BEFORE → AFTERNot a rename — a change of job

The first line of the Claude Code 2.1.147 changelog, shipped on May 21, says the /simplify command became /code-review. It looks like a simple rename, but what it actually does has changed.

Before · gone
/simplify
Code-simplification helper
Target current code
Output in the terminal
Focus refactor suggestions
→ 2.1.147
↓
Now · first-class command
/code-review
Correctness bug review
Target current diff
Output down to PR comments
Focus correctness bugs

The key is that the focus moved. Instead of “make it cleaner,” it now looks at “does this change have a bug?” Anthropic has said it runs code review on nearly every PR internally.

02 · WHAT SHIPPEDWhat landed in this week’s batch

Review effort
tunable
low→max selectable
PR posting
–comment
GitHub inline comments
/usage
by category
skill·subagent·MCP
/diff
keyboard
j·k·PgUp scroll

You can pick the review effort, from low to max. Low and medium surface only a few high-confidence flags, while high and max cast a wider net and catch the uncertain stuff too. In the same week, 2.1.149 made /usage break usage down by skills, subagents, plugins, and MCP servers, and let you scroll /diff from the keyboard.

03 · HOW IT FITSWhere it slots into your workflow

▮ /code-review use cases
  • Run it locally once before opening a PRIt only looks at the current diff, so it stays focused on what changed
  • Use low effort for busy PRs to get just the essentialsLess noise, high-confidence flags only
  • Use –comment to put the review on the PR for important changesReviewers see it right inside GitHub
  • Not a replacement for human review yetSafer to treat it as a first-pass filter

04 · POSITIONThe point is that it isn’t a separate tool

▮ POSITION · OBJECTIVE 2026 / 05 / 26

The most striking part of this change is that code review didn’t arrive as a separate tool — it came in as a single CLI command.

Why it matters

It stays inside your terminal workflow — no separate review bot to wire up.

What to watch

How much accuracy actually differs across effort levels is something you’ll only learn by using it.

05 · CODAEddie’s take

“The thing is, the review command doesn’t just end on your screen — it goes out to the PR. If it were me, I’d wire it into the team pipeline as a first-pass filter first.”

— Eddie

If you’re already on Claude Code, update and run /code-review first. And if you’ve got the /simplify shortcut in muscle memory, just remember the name changed.

References
Claude Code official

Claude Code Changelog (2.1.147 / 2.1.149) anthropics/claude-code Releases

Context

Anthropic News (Code with Claude)

Disclaimer: Based on the official changelog. Features may change by version. No ads or affiliate links.

This post is part of an English mirror of a Korean dev experiments blog. Cross-posted for the global developer audience.

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