diff --git a/packages/tui/internal/theme/themes/mellow.json b/packages/tui/internal/theme/themes/mellow.json
new file mode 100644
index 0000000000..f2a00a47f7
--- /dev/null
+++ b/packages/tui/internal/theme/themes/mellow.json
@@ -0,0 +1,87 @@
+{
+  "$schema": "https://opencode.ai/theme.json",
+  "defs": {
+    "dark_bg": "#161617",
+    "dark_fg": "#c9c7cd",
+    "dark_bg_dark": "#131314",
+
+    "dark_black": "#27272a",
+    "dark_red": "#f5a191",
+    "dark_green": "#90b99f",
+    "dark_yellow": "#e6b99d",
+    "dark_blue": "#aca1cf",
+    "dark_magenta": "#e29eca",
+    "dark_cyan": "#ea83a5",
+    "dark_white": "#c1c0d4",
+
+    "dark_bright_black": "#353539",
+    "dark_bright_red": "#ffae9f",
+    "dark_bright_green": "#9dc6ac",
+    "dark_bright_yellow": "#f0c5a9",
+    "dark_bright_blue": "#b9aeda",
+    "dark_bright_magenta": "#ecaad6",
+    "dark_bright_cyan": "#f591b2",
+    "dark_bright_white": "#cac9dd",
+
+    "dark_gray00": "#18181a",
+    "dark_gray01": "#1b1b1d",
+    "dark_gray02": "#2a2a2d",
+    "dark_gray03": "#3e3e43",
+    "dark_gray04": "#57575f",
+    "dark_gray05": "#757581",
+    "dark_gray06": "#9998a8",
+    "dark_gray07": "#c1c0d4"
+  },
+  "theme": {
+    "primary": "dark_cyan",
+    "secondary": "dark_cyan",
+    "accent": "dark_blue",
+    "error": "dark_cyan",
+    "warning": "dark_yellow",
+    "success": "dark_green",
+    "info": "dark_blue",
+    "text": "dark_fg",
+    "textMuted": "dark_white",
+    "background": "dark_bg",
+    "backgroundPanel": "dark_gray01",
+    "backgroundElement": "dark_gray02",
+    "border": "dark_gray02",
+    "borderActive": "dark_gray01",
+    "borderSubtle": "dark_gray00",
+    "diffAdded": "dark_black",
+    "diffRemoved": "dark_black",
+    "diffContext": "dark_fg",
+    "diffHunkHeader": "dark_magenta",
+    "diffHighlightAdded": "dark_bright_green",
+    "diffHighlightRemoved": "dark_bright_red",
+    "diffAddedBg": "dark_green",
+    "diffRemovedBg": "dark_red",
+    "diffContextBg": "dark_gray00",
+    "diffLineNumber": "diffContextBg",
+    "diffAddedLineNumberBg": "dark_green",
+    "diffRemovedLineNumberBg": "dark_red",
+    "markdownText": "dark_fg",
+    "markdownHeading": "dark_gray06",
+    "markdownLink": "dark_blue",
+    "markdownLinkText": "dark_cyan",
+    "markdownCode": "dark_bright_green",
+    "markdownBlockQuote": "dark_gray00",
+    "markdownEmph": "dark_bright_yellow",
+    "markdownStrong": "dark_bright_red",
+    "markdownHorizontalRule": "markdownText",
+    "markdownListItem": "dark_blue",
+    "markdownListEnumeration": "dark_bright_blue",
+    "markdownImage": "markdownLink",
+    "markdownImageText": "markdownLinkText",
+    "markdownCodeBlock": "dark_fg",
+    "syntaxComment": "dark_gray05",
+    "syntaxKeyword": "dark_blue",
+    "syntaxFunction": "dark_gray07",
+    "syntaxVariable": "dark_fg",
+    "syntaxString": "dark_green",
+    "syntaxNumber": "dark_magenta",
+    "syntaxType": "dark_magenta",
+    "syntaxOperator": "dark_yellow",
+    "syntaxPunctuation": "dark_gray06"
+  }
+}