Claude Code v2.1.306

Released Oct 21, 2026 · Anthropic

Upgraded to Claude Code v2.1.306?

Tell other builders how it went. Anonymous, one answer each; the tally shows once three people have answered.

I run

See what changed since, breaking first, with a prompt your agent can work from.

What's changed

Fixed claude -p inside cloud sessions reporting "Not logged in" when started without the session's environment variables
Fixed an API error being replaced by "prompt is too long", and an unneeded compaction, in sessions with many MCP tools