diff --git a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
index 87248a6a8ba..ca559f6cdc4 100644
--- a/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
+++ b/packages/opencode/src/cli/cmd/tui/routes/session/dialog-timeline.tsx
@@ -1,8 +1,8 @@
 import { createMemo, onMount } from "solid-js"
 import { useSync } from "@tui/context/sync"
 import { DialogSelect, type DialogSelectOption } from "@tui/ui/dialog-select"
-import type { TextPart } from "@opencode-ai/sdk/v2"
 import { Locale } from "@/util/locale"
+import { getVisibleTextPart } from "@tui/util/message-filter"
 import { DialogMessage } from "./dialog-message"
 import { useDialog } from "../../ui/dialog"
 import type { PromptInfo } from "../../component/prompt/history"
@@ -24,9 +24,7 @@ export function DialogTimeline(props: {
     const result = [] as DialogSelectOption<string>[]
     for (const message of messages) {
       if (message.role !== "user") continue
-      const part = (sync.data.part[message.id] ?? []).find(
-        (x) => x.type === "text" && !x.synthetic && !x.ignored,
-      ) as TextPart
+      const part = getVisibleTextPart(sync.data.part[message.id] ?? [])
       if (!part) continue
       result.push({
         title: part.text.replace(/\n/g, " "),
diff --git a/packages/opencode/src/cli/cmd/tui/util/message-filter.ts b/packages/opencode/src/cli/cmd/tui/util/message-filter.ts
new file mode 100644
index 00000000000..3b248606a1c
--- /dev/null
+++ b/packages/opencode/src/cli/cmd/tui/util/message-filter.ts
@@ -0,0 +1,16 @@
+import type { Part, TextPart } from "@opencode-ai/sdk/v2"
+
+/**
+ * Returns true if a part is a visible text part (not synthetic and not ignored).
+ */
+export function isVisibleTextPart(part: Part): part is TextPart {
+  return part.type === "text" && !part.synthetic && !part.ignored
+}
+
+/**
+ * Returns the first visible text part from an array of parts.
+ * A visible text part is one that is not synthetic and not ignored.
+ */
+export function getVisibleTextPart(parts: Part[]): TextPart | undefined {
+  return parts.find(isVisibleTextPart)
+}