From 008eae54112c65e2cf92d0891e2a160457c0b746 Mon Sep 17 00:00:00 2001
From: Thomas Brugman <thomas.brugman.teb3@gmail.com>
Date: Sun, 26 Jul 2026 16:18:32 +0200
Subject: [PATCH] fix(ui): preserve parenthesized tildes in markdown

---
 .changeset/fuzzy-tildes-smile.md              |  5 ++++
 packages/ui/src/context/marked.tsx            | 11 ++++++++
 .../kilocode/markdown-strikethrough.test.ts   | 26 +++++++++++++++++++
 3 files changed, 42 insertions(+)
 create mode 100644 .changeset/fuzzy-tildes-smile.md
 create mode 100644 packages/ui/src/kilocode/markdown-strikethrough.test.ts

diff --git a/.changeset/fuzzy-tildes-smile.md b/.changeset/fuzzy-tildes-smile.md
new file mode 100644
index 00000000000..39c76209f86
--- /dev/null
+++ b/.changeset/fuzzy-tildes-smile.md
@@ -0,0 +1,5 @@
+---
+"kilo-code": patch
+---
+
+Preserve parenthesized tilde expressions as literal text in rendered chat messages.
diff --git a/packages/ui/src/context/marked.tsx b/packages/ui/src/context/marked.tsx
index 050b7005264..33af8ff08e2 100644
--- a/packages/ui/src/context/marked.tsx
+++ b/packages/ui/src/context/marked.tsx
@@ -321,6 +321,17 @@ export const createMarkedParser = (props: { nativeParser?: NativeMarkdownParser
         },
         // kilocode_change end
       },
+      // kilocode_change start: Marked accepts a tilde preceded by an opening
+      // parenthesis as the closing delimiter. It is left-flanking there, so
+      // preserve it literally instead of corrupting text such as "(~1 GB)".
+      tokenizer: {
+        del(src) {
+          const match = this.rules.inline.del.exec(src)
+          if (match?.[0].at(-2) === "(") return
+          return false
+        },
+      },
+      // kilocode_change end
     },
     // kilocode_change start: enable only double-dollar math.
     // Single $ is far more common as a currency symbol in agent responses
diff --git a/packages/ui/src/kilocode/markdown-strikethrough.test.ts b/packages/ui/src/kilocode/markdown-strikethrough.test.ts
new file mode 100644
index 00000000000..3ef4c42e51c
--- /dev/null
+++ b/packages/ui/src/kilocode/markdown-strikethrough.test.ts
@@ -0,0 +1,26 @@
+import { describe, expect, test } from "bun:test"
+import { createMarkedParser } from "../context/marked"
+
+describe("Markdown strikethrough boundaries", () => {
+  test.each(["(~a (~b", "~a (~b", "(~24 GB) and (~5.7 GB)", "(~/.config) and (~/.cache)"])(
+    "preserves parenthesized tildes in %s",
+    async (text) => {
+      const parser = createMarkedParser({})
+      const html = await Promise.resolve(parser.parse(text))
+
+      expect(html).not.toContain("<del>")
+      expect(html).toContain(text)
+    },
+  )
+
+  test.each([
+    ["~removed~", "<del>removed</del>"],
+    ["~~removed~~", "<del>removed</del>"],
+    ["(~removed~)", "(<del>removed</del>)"],
+  ])("keeps valid strikethrough syntax in %s", async (text, expected) => {
+    const parser = createMarkedParser({})
+    const html = await Promise.resolve(parser.parse(text))
+
+    expect(html).toContain(expected)
+  })
+})