Zed v1.29.1-pre adds Claude Fable 5.2 and Claude Mythos 5.2 support, plus Git Panel branch mode

Zed Industries' release tagged v1.29.1-pre adds support for Claude Fable 5.2 and Claude Mythos 5.2 in the Anthropic provider (PR #66760). The release also adds a Git Panel branch mode, a bookmark picker, configurable Git date formats and a setting to turn off automatic agent thread titles.

AI changes

• Anthropic provider: Claude Fable 5.2 and Claude Mythos 5.2 are now supported (#66760).
• Thread titles: a new agent.auto_generate_thread_titles setting defaults to true. Setting it to false disables automatic title generation for Zed Agent threads (#63998).
• Copy button: the copy button on agent responses now briefly shows a checkmark to confirm the copy (#64664).
• ACP agent options: the first config option an ACP agent provides now appears next to the send button in the message editor (#66733).

Git changes

• Branch mode in the Git Panel: it lists all files changed since a base branch such as origin/main. Choose "Compare Against Base" from the new menu at the top of the Changes tab to pick the base, or run git panel: show branch changes to compare against the default branch. Files in this mode can be opened as diffs but not staged or restored (#66482).
• Date formatting: a git.date_format setting accepts "locale", "iso", or a strftime format such as "%Y-%m-%d %H:%M" for absolute Git dates. Per-view date_style settings ("relative" or "absolute") cover git.blame, git.inline_blame, git.branch_picker, git.stash_picker, git_panel and git_graph (#66533).
• Commit view: new git.commit_view.expand_description and git.commit_view.expand_files settings control whether the commit view opens with the full message shown and changed files expanded (#66331).
• Blame navigation: opening a commit from Git blame now scrolls the commit view to the blamed file instead of the top of the diff (#65237).
• Performance: Git status refresh is faster in very large repositories when many files change at once (#66242).
• Branch rename: git: rename branch now trims the new name, replaces spaces with dashes to match branch creation, and previews the resulting name in the modal (#65734).
• Repository selector: the Git Panel selector now distinguishes repositories that share the same directory name (#62800).

Other changes

• A bookmark picker for browsing, searching and previewing all bookmarks in the current workspace opens with project bookmarks: toggle (#60005).
• dev: open key context view now scrolls horizontally, so long context predicates are no longer cut off (#66528).

Bug fixes

• Opening a file through workspace: open no longer replaces the current project with one containing only that file. It opens as a tab in the current project (#66103).
• Switching branches in a remote project no longer resends the full Git history over SSH, which had stalled the terminal and file opening (#65436).
• SSH connections no longer fail with "Missing remote shell" when the remote shell's startup reads from stdin (#66737).
• SSH connections to macOS hosts no longer get stuck on "Starting Proxy" when the remote server cannot access the system pasteboard (#66736).
• The file finder now shows files outside the project when searching by absolute path, and files matching file_scan_exclusions when searching by exact path (#66227).
• The copy button at the bottom of an agent thread no longer copies a response from an earlier turn when the latest turn had no response text (#64664).
• The read-only toggle icon and action no longer appear on tabs that do not support toggling read-only.

What this means

For Zed users on the Anthropic provider, the two new Claude entries are available through the existing provider setup. The release notes list no other change for it.

The branch mode gives a read-oriented view of everything changed against a base branch, with diffs but no staging or restoring. That suits reviewing a whole branch rather than managing a commit. The agent.auto_generate_thread_titles setting gives users control over automatic title generation in Zed Agent threads. The SSH fixes address hangs and connection failures for remote development.