Source Intelligence
Follow Discord
Sweep 28 Aug 2026 · 16:06Z Build v2.1.251 479 read Stable v2.1.236 Latest v2.1.251 Next v2.1.251 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_SESSION_REFS

A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.210, including the newest one read.

What it is

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

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 – 2.1.251 6 releases never mined — —
2.1.210 – 2.1.243 33 releases in the build bool —

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 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

None of Anthropic's documentation pages this site has a copy of carries this name.

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_SKILLSSynced-skill state files are schema-checked, so one bad record no longer discards the lot. 2.1.149 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.