Version bumped to 2.1.221

Claude Code is now version 2.1.221, which shows up in /doctor and update checks.

Under the hood Internal Changes

JSON All of v2.1.221

Under the hoodTier: how much it should matter to you

2Useful: my rating, 1 to 5

0Signal: worth watching, 1 to 5

ElsewhereArea: what it touches

Internal ChangesKind: in v2.1.221, 03 Aug 26

Internal ChangesSection of the release

What

Build constants updated throughout, which is what most of the hunks in this area amount to.

Details

VERSION 2.1.220 to 2.1.221, BUILD_TIME 2026-07-24T22:17:45Z to 2026-08-03T03:19:26Z, and a new GIT_SHA
these feed the User-Agent, /doctor output, update messages and checks, telemetry, the npm view call, claude daemon version warnings, the SDK get_binary_version response and the Remote Control minimum-version error

Evidence

BUILD_TIME: "2026-08-03T03:19:26Z", GIT_SHA: "6efaf12e8b43dc7dbe50e0955c76dc4174a15876"

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Read from

Names in the bundle/doctor

The build it came inv2.1.221

3 Aug 2026 · 308 entries, this one is #291.

Either side of it

Open the release →

Names in this entry

slash/doctor
Skill. Run a setup checkup that diagnoses issues and can fix them. Checks installation health, including duplicate or leftover installs, PATH problems, and unparseable settings files. Finds unused skills, MCP servers, and plugins versus their context cost, flags slow hooks, and checks for a newer version on your release channel. Deduplicates local CLAUDE.md files against checked-in ones, trims checked-in CLAUDE.md files by cutting content Claude could derive from the codebase, and migrates the always-loaded guidance that remains into skills and nested CLAUDE.md files that load on demand. Also offers to make auto mode your default and to pre-approve frequently denied read-only commands. Reports findings first and asks for confirmation before changing anything. From the terminal, claude doctor prints read-only installation diagnostics without starting a session. Alias: /checkup. Run /doctor prompt-audit to have Claude audit your CLAUDE.md files, skills, and other configuration for outdated or conflicting instructions instead of running the checkup. The prompt-audit subcommand requires Claude Code v2.1.283 or later. The CLAUDE.md trim check requires Claude Code v2.1.206 or later. Before v2.1.205, /doctor opened a read-only diagnostics screen and pressing f sent the report to Claude

Is this right?

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.