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Sweep 28 Aug 2026 · 00:00Z Build v2.1.250 478 read Stable v2.1.236 Latest v2.1.250 Next v2.1.250 Feeds RSS JSON llms.txt

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

Reference / Environment variables

CLAUDE_CODE_SYNC_SKILLS

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.149, including the newest one read.

What it is

Synced-skill state files are schema-checked, so one bad record no longer discards the lot.

Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.228.

Presence across releases

ReleasesReadingDeclared typeDefault
2.1.245 – 2.1.250 5 releases never mined — —
2.1.210 – 2.1.243 33 releases in the build bool —
2.1.149 – 2.1.209 51 releases in the build — —

A row reading never mined is a release with no archived bundle behind it. Nothing was read out of it, so nothing here says whether the name was in it. A declared type or a default is only ever what that release's own bundle stated.

Changelog entries naming it

  1. v2.1.228Skills-sync state file is validated before use

    Synced-skill state files are schema-checked, so one bad record no longer discards the lot.

    named in this entry

  2. v2.1.228Skills synced from claude.ai

    Skills from your claude.ai account can load as a source, but only if you set the sync env var.

    named in this entry

Documentation pages

A reference table page is one whose own table defines this name, and it is where the description above came from. A page that mentions it carries the name somewhere in its text and may say nothing about it at all. Every page carrying it.

Names beside it

Every environment variable in the inventory starting claude_code_sync, up to twelve of them.

CLAUDE_CODE_SYNC_PLUGIN_INSTALLHeadless plugin installs refresh the cache in the background; set CLAUDE_CODE_SYNC_PLUGIN_INSTALL to skip it. 2.1.138 CLAUDE_CODE_SYNC_PLUGIN_INSTALL_TIMEOUT_MSNo description from anybody. 2.1.138 CLAUDE_CODE_SYNC_PLUGINSThe name synced is now reserved for marketplaces, with new messages for claude.ai plugin conflicts. 2.1.157 CLAUDE_CODE_SYNC_PLUGINS_BUFFERED_DOWNLOADNo description from anybody. 2.1.179 CLAUDE_CODE_SYNC_PLUGINS_DOWNLOAD_STALL_MSNo description from anybody. 2.1.179 CLAUDE_CODE_SYNC_PLUGINS_INSTALL_TIMEOUT_MSNo description from anybody. 2.1.157 CLAUDE_CODE_SYNC_PLUGINS_MCP_TIMEOUT_MSNo description from anybody. 2.1.157 CLAUDE_CODE_SYNC_SESSION_REFSSkills from your claude.ai account can load as a source, but only if you set the sync env var. 2.1.210 CLAUDE_CODE_SYNC_SKILLS_INSTALL_TIMEOUT_MSNo description from anybody. 2.1.163 CLAUDE_CODE_SYNC_SKILLS_WAIT_TIMEOUT_MSNo description from anybody. 2.1.149

Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.