Users can now create, edit, and manage custom color themes with fine-grained color token overrides.
Details
Custom themes are stored as JSON files in the user's themes directory (~/.claude/themes/)
Each theme specifies a name, base theme (dark or light), and color overrides
Color overrides accept rgb(r,g,b), #rrggbb, ansi256(n), or ansi:name formats
Custom themes appear in the /theme picker with a (custom) label
A "New custom theme…" option is available in the theme selector to create themes interactively
File watcher auto-reloads themes when JSON files are added, changed, or removed
Themes from plugins are also supported via a themes field in plugin.json or a themes/ directory
Plugin settings schema adds themesDirectories for specifying additional theme paths
Evidence
Theme creation flow (search for "__new_custom_theme__") and color validation (search for "Accepts rgb(r,g,b)" and "rgb(r,g,b) · #rrggbb · ansi:red").
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
How sure we are
One source agreesOne thing we can check says the same as this entry.
Anthropic's release notes agreeCreate and switch between named custom themes from /theme, or hand-edit JSON files in ~/.claude/themes/; plugins can also ship themes via a…
