fix(coding-agent): match provider-first model searches

packages/coding-agent/test/interactive-mode-status.test.ts

@@ -356,6 +356,59 @@ describe("InteractiveMode.setupAutocompleteProvider", () => {
 	});
 });
 
+describe("InteractiveMode.createBaseAutocompleteProvider", () => {
+	test("matches model command arguments across provider/model order", async () => {
+		type TestModel = { id: string; provider: string; name: string };
+		type FakeInteractiveMode = {
+			session: {
+				scopedModels: Array<{ model: TestModel }>;
+				modelRegistry: { getAvailable: () => TestModel[] };
+				promptTemplates: [];
+				extensionRunner: { getRegisteredCommands: () => [] };
+				resourceLoader: { getSkills: () => { skills: [] } };
+			};
+			settingsManager: { getEnableSkillCommands: () => boolean };
+			skillCommands: Map<string, string>;
+			sessionManager: { getCwd: () => string };
+			fdPath: null;
+		};
+
+		const createBaseAutocompleteProvider = (
+			InteractiveMode as unknown as {
+				prototype: { createBaseAutocompleteProvider(this: FakeInteractiveMode): AutocompleteProvider };
+			}
+		).prototype.createBaseAutocompleteProvider;
+		const models = [
+			{ id: "gpt-5.2-codex", provider: "github-copilot", name: "GPT-5.2 Codex" },
+			{ id: "gpt-5.5", provider: "openai-codex", name: "GPT-5.5" },
+		];
+		const fakeThis: FakeInteractiveMode = {
+			session: {
+				scopedModels: [],
+				modelRegistry: { getAvailable: () => models },
+				promptTemplates: [],
+				extensionRunner: { getRegisteredCommands: () => [] },
+				resourceLoader: { getSkills: () => ({ skills: [] }) },
+			},
+			settingsManager: { getEnableSkillCommands: () => false },
+			skillCommands: new Map(),
+			sessionManager: { getCwd: () => "/tmp" },
+			fdPath: null,
+		};
+
+		const provider = createBaseAutocompleteProvider.call(fakeThis);
+		const line = "/model codexgpt";
+		const suggestions = await provider.getSuggestions([line], 0, line.length, {
+			signal: new AbortController().signal,
+		});
+
+		expect(suggestions?.items.map((item) => item.value)).toEqual([
+			"openai-codex/gpt-5.5",
+			"github-copilot/gpt-5.2-codex",
+		]);
+	});
+});
+
 describe("InteractiveMode.showLoadedResources", () => {
 	beforeAll(() => {
 		initTheme("dark");