fix(composer): preserve draft when picking provider commands

apps/mobile/src/features/threads/use-composer-command-menu.ts

@@ -16,6 +16,7 @@ import {
 } from "../../state/use-composer-drafts";
 import { USAGE_LIMITS_COMMAND } from "@t3tools/shared/usageLimits";
 import {
+  composerTriggerIsOnlyText,
   detectComposerTrigger,
   replaceTextRange,
   serializeComposerFileLink,
@@ -534,7 +535,8 @@ export function useComposerCommandMenu({
       if (
         item.type === "provider-slash-command" &&
         item.command.argumentMode === "none" &&
-        onProviderCommand
+        onProviderCommand &&
+        composerTriggerIsOnlyText(draftMessage, trigger.rangeStart, trigger.rangeEnd)
       ) {
         const cleared = replaceTextRange(draftMessage, trigger.rangeStart, trigger.rangeEnd, "");
         setSelection({ start: cleared.cursor, end: cleared.cursor });

apps/web/src/components/chat/ChatComposer.tsx

@@ -48,7 +48,10 @@ import {
   pastedTextDisposition,
   wouldTextPasteExceedLimit,
 } from "@t3tools/client-runtime/text-paste";
-import { serializeComposerFileLink } from "@t3tools/shared/composerTrigger";
+import {
+  composerTriggerIsOnlyText,
+  serializeComposerFileLink,
+} from "@t3tools/shared/composerTrigger";
 import { folderDropTarget, resolveDroppedFolderPath } from "./folderDrop";
 import { createModelSelection, normalizeModelSlug } from "@t3tools/shared/model";
 import { USAGE_LIMITS_COMMAND } from "@t3tools/shared/usageLimits";
@@ -3640,7 +3643,11 @@ export const ChatComposer = memo(function ChatComposer(props: ChatComposerProps)
           }
           return;
         }
-        if (item.command.argumentMode === "none" && onProviderCommand) {
+        if (
+          item.command.argumentMode === "none" &&
+          onProviderCommand &&
+          composerTriggerIsOnlyText(snapshot.value, trigger.rangeStart, trigger.rangeEnd)
+        ) {
           const applied = applyPromptReplacement(trigger.rangeStart, trigger.rangeEnd, "", {
             expectedText: snapshot.value.slice(trigger.rangeStart, trigger.rangeEnd),
           });

packages/shared/src/composerTrigger.test.ts

@@ -1,6 +1,10 @@
 import { describe, expect, it } from "vite-plus/test";
 
-import { detectComposerTrigger, serializeComposerFileLink } from "./composerTrigger.ts";
+import {
+  composerTriggerIsOnlyText,
+  detectComposerTrigger,
+  serializeComposerFileLink,
+} from "./composerTrigger.ts";
 
 describe("detectComposerTrigger", () => {
   it.each(["$", "€", "£", "¥", "₹", "₩", "₿", "𑿝"])(
@@ -17,6 +21,18 @@ describe("detectComposerTrigger", () => {
   );
 });
 
+describe("composerTriggerIsOnlyText", () => {
+  it("accepts a standalone slash-command trigger", () => {
+    expect(composerTriggerIsOnlyText("/com", 0, 4)).toBe(true);
+    expect(composerTriggerIsOnlyText("  /com  ", 2, 6)).toBe(true);
+  });
+
+  it("rejects a trigger when other draft text would remain", () => {
+    expect(composerTriggerIsOnlyText("/com keep this draft", 0, 4)).toBe(false);
+    expect(composerTriggerIsOnlyText("keep /com", 5, 9)).toBe(false);
+  });
+});
+
 describe("serializeComposerFileLink", () => {
   it("uses the basename as the markdown label", () => {
     expect(serializeComposerFileLink("path/to/package.json")).toBe(

packages/shared/src/composerTrigger.ts

@@ -140,3 +140,17 @@ export function replaceTextRange(
   const nextText = `${text.slice(0, safeStart)}${replacement}${text.slice(safeEnd)}`;
   return { text: nextText, cursor: safeStart + replacement.length };
 }
+
+
+/**
+ * True when removing the active autocomplete trigger leaves no other prompt text.
+ * Used by no-argument provider commands so selecting a command only auto-runs a
+ * standalone command and never discards surrounding draft text.
+ */
+export function composerTriggerIsOnlyText(
+  text: string,
+  rangeStart: number,
+  rangeEnd: number,
+): boolean {
+  return replaceTextRange(text, rangeStart, rangeEnd, "").text.trim().length === 0;
+}