Claude Code changelog & release notes

What's changed Added a code key to the Claude apps gateway's managed.policies[] : the same settings as cli , also applied in Claude Desktop's Code tab; beside desktop , it turns…

What's changed Added onFailure: "block" for command and HTTP hooks: a hook that can't start, times out, or exits with an unexpected code blocks the action instead of letting it…

What's changed Fixed prompt and agent hooks written as instructions (such as "Block commands that...") allowing what they should block Improved how prompt hooks on Stop and…

What's changed Added Claude Haiku 5.5 ( claude-haiku-5-5 ), now the default Haiku model on the Anthropic API — 1M context, $0.10/$0.50 per Mtok ($0.50/$2.50 for prompts over…

What's changed Added --marketplace source to claude plugin install : adds the marketplace if needed, under the same policy checks as claude plugin marketplace add , then installs…

What's changed Fixed a regression in 2.1.290 where cloud sessions could drop answers to permission prompts Fixed a regression in 2.1.288 where the last messages of a session…

What's changed Added serverToolUses to the result of a mod's turn.step hook: the tool calls the API ran itself (the advisor), each with its id, name, input, start and end Added…

What's changed Fixed a deny or ask rule on a nested part of a compound shell command not holding over a user-installed mod's approval on managed machines Fixed the terminal…

What's changed Added $.ui.selection() for mods: returns the text you last selected in fullscreen mode and, when the selection lies within one transcript row, that row Added a…

What's changed Added Claude Mods: plugins may now modify deeper behavior Added You should know, a built-in mod where a side agent watches your back and flags things you or Claude…