fix(ui): execute directly typed inline command args

ui/src/pages/chat/chat-view.test.ts

@@ -3620,6 +3620,34 @@ describe("chat slash menu accessibility", () => {
     expect(onSend).not.toHaveBeenCalled();
   });
 
+  it.each([
+    ["think", "high"],
+    ["verbose", "full"],
+  ])(
+    "executes a directly typed inline /%s argument without requiring completion",
+    (command, argument) => {
+      let draft = "";
+      const onDraftChange = vi.fn((next: string) => {
+        draft = next;
+      });
+      const onSend = vi.fn();
+      const onSlashCommand = vi.fn();
+      const { container } = createReactiveDraftHarness({
+        onDraftChange,
+        onSend,
+        onSlashCommand,
+      });
+
+      inputDraftAtEnd(container, `hello /${command} ${argument}`);
+      keydownComposer(container, "Enter");
+
+      expect(onSlashCommand).toHaveBeenCalledExactlyOnceWith(`/${command} ${argument}`);
+      expect(draft).toBe("hello ");
+      expect(container.querySelector<HTMLTextAreaElement>("textarea")?.value).toBe(draft);
+      expect(onSend).not.toHaveBeenCalled();
+    },
+  );
+
   it("preserves typed inline argument mode across command hydration", async () => {
     let draft = "";
     let resolveRefresh: (() => void) | undefined;

ui/src/pages/chat/components/chat-composer-inline-slash.ts

@@ -0,0 +1,55 @@
+import {
+  getSlashCommandCompletions,
+  type InlineSlashCompletion,
+  type SlashCommandDef,
+} from "../../../lib/chat/commands.ts";
+
+export type InlineSlashArgumentInvocation = {
+  command: SlashCommandDef;
+  completion: InlineSlashCompletion;
+};
+
+export function findDirectInlineSlashArgumentInvocation(
+  text: string,
+  caret = text.length,
+): InlineSlashArgumentInvocation | null {
+  const boundedCaret = Math.max(0, Math.min(caret, text.length));
+  const prefix = text.slice(0, boundedCaret);
+  const commandPattern = /(?:^|\s)\/([^\s/:]+)\s+/gu;
+  let invocation: InlineSlashArgumentInvocation | null = null;
+
+  for (const match of prefix.matchAll(commandPattern)) {
+    const typedName = match[1]?.toLowerCase();
+    if (!typedName || match.index === undefined) {
+      continue;
+    }
+    const command = getSlashCommandCompletions(typedName, {
+      showAll: true,
+      inlineOnly: true,
+    }).find(
+      (entry) =>
+        entry.name.toLowerCase() === typedName ||
+        entry.aliases?.some((alias) => alias.replace(/^\//u, "").toLowerCase() === typedName),
+    );
+    if (!command?.args || command.source === "skill") {
+      continue;
+    }
+    const start = match.index + match[0].indexOf("/");
+    const args = prefix.slice(match.index + match[0].length).trim();
+    if (!args) {
+      continue;
+    }
+    invocation = {
+      command,
+      completion: {
+        query: command.name,
+        start,
+        end: boundedCaret,
+        inline:
+          text.slice(0, start).trim().length > 0 || text.slice(boundedCaret).trim().length > 0,
+      },
+    };
+  }
+
+  return invocation?.completion.inline ? invocation : null;
+}

ui/src/pages/chat/components/chat-composer-slash-menu.ts

@@ -12,6 +12,7 @@ import {
 } from "../../../lib/chat/commands.ts";
 import { exportChatMarkdown } from "../export.ts";
 import { adjustTextareaHeight } from "./chat-composer-dom.ts";
+import { findDirectInlineSlashArgumentInvocation } from "./chat-composer-inline-slash.ts";
 import { commitComposerDraft, getChatComposerState } from "./chat-composer-state.ts";
 import type { ChatComposerProps, ChatComposerState } from "./chat-composer-types.ts";
 
@@ -439,16 +440,36 @@ function submitInlineSlashArgument(props: ChatComposerProps, requestUpdate: () =
   return true;
 }
 
+function beginDirectInlineSlashArgument(
+  props: ChatComposerProps,
+  state: ChatComposerState,
+): boolean {
+  if (!props.onSlashCommand) {
+    return false;
+  }
+  const target = state.composerTextarea;
+  const current = target?.value ?? props.getDraft?.() ?? props.draft;
+  const caret = target?.selectionStart ?? current.length;
+  const invocation = findDirectInlineSlashArgumentInvocation(current, caret);
+  if (!invocation) {
+    return false;
+  }
+  state.slashMenuMode = "freeform-args";
+  state.slashMenuCommand = invocation.command;
+  state.slashMenuCompletion = invocation.completion;
+  return true;
+}
+
 export function handleInlineSlashArgumentKeyDown(
   event: KeyboardEvent,
   props: ChatComposerProps,
   requestUpdate: () => void,
 ): boolean {
   const state = getChatComposerState(props.paneId);
-  if (state.slashMenuMode !== "freeform-args" || !state.slashMenuCompletion?.inline) {
-    return false;
-  }
   if (event.key === "Escape") {
+    if (state.slashMenuMode !== "freeform-args" || !state.slashMenuCompletion?.inline) {
+      return false;
+    }
     event.preventDefault();
     resetSlashMenuState(state);
     requestUpdate();
@@ -457,6 +478,12 @@ export function handleInlineSlashArgumentKeyDown(
   if (event.key !== "Enter") {
     return false;
   }
+  if (
+    (state.slashMenuMode !== "freeform-args" || !state.slashMenuCompletion?.inline) &&
+    !beginDirectInlineSlashArgument(props, state)
+  ) {
+    return false;
+  }
   event.preventDefault();
   return submitInlineSlashArgument(props, requestUpdate);
 }