feat: model picker.

playwright/app.spec.ts

@@ -1,5 +1,6 @@
 import { expect, test } from '@playwright/test'
 import type { Page } from '@playwright/test'
+import { defaultGitHubChatModel } from '../src/modules/github-api.js'
 
 const webServerMode = process.env.PLAYWRIGHT_WEB_SERVER_MODE ?? 'dev'
 const appEntryPath = webServerMode === 'preview' ? '/index.html' : '/src/index.html'
@@ -12,6 +13,8 @@ type ChatRequestMessage = {
 type ChatRequestBody = {
   metadata?: unknown
   messages?: ChatRequestMessage[]
+  model?: string
+  stream?: boolean
 }
 
 const waitForAppReady = async (page: Page, path = appEntryPath) => {
@@ -256,6 +259,7 @@ test('AI chat prefers streaming responses when available', async ({ page }) => {
   )
 
   expect(streamRequestBody?.metadata).toBeUndefined()
+  expect(streamRequestBody?.model).toBe(defaultGitHubChatModel)
   const systemMessage = streamRequestBody?.messages?.find(
     (message: ChatRequestMessage) => message.role === 'system',
   )
@@ -335,9 +339,14 @@ test('AI chat falls back to non-streaming response when streaming fails', async
 }) => {
   let streamAttemptCount = 0
   let fallbackAttemptCount = 0
+  const attemptedModels: string[] = []
 
   await page.route('https://models.github.ai/inference/chat/completions', async route => {
-    const body = route.request().postDataJSON() as { stream?: boolean } | null
+    const body = route.request().postDataJSON() as ChatRequestBody | null
+    if (typeof body?.model === 'string') {
+      attemptedModels.push(body.model)
+    }
+
     if (body?.stream) {
       streamAttemptCount += 1
       await route.fulfill({
@@ -373,6 +382,10 @@ test('AI chat falls back to non-streaming response when streaming fails', async
   await connectByotWithSingleRepo(page)
   await ensureAiChatDrawerOpen(page)
 
+  const selectedModel = 'openai/gpt-5-mini'
+  await page.locator('#ai-chat-model').selectOption(selectedModel)
+  await expect(page.locator('#ai-chat-model')).toHaveValue(selectedModel)
+
   await page.locator('#ai-chat-prompt').fill('Use fallback path.')
   await page.locator('#ai-chat-send').click()
 
@@ -383,6 +396,8 @@ test('AI chat falls back to non-streaming response when streaming fails', async
   )
   expect(streamAttemptCount).toBeGreaterThan(0)
   expect(fallbackAttemptCount).toBeGreaterThan(0)
+  expect(attemptedModels.length).toBeGreaterThan(0)
+  expect(attemptedModels.every(model => model === selectedModel)).toBe(true)
 })
 
 test('BYOT remembers selected repository across reloads', async ({ page }) => {
@@ -433,7 +448,7 @@ test('BYOT remembers selected repository across reloads', async ({ page }) => {
 test('renders default playground preview', async ({ page }) => {
   await waitForInitialRender(page)
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await expect(page.locator('#status')).toHaveText('Rendered')
   await expectPreviewHasRenderedContent(page)
 })
@@ -668,7 +683,7 @@ test('renders in react mode with css modules', async ({ page }) => {
   await ensurePanelToolsVisible(page, 'component')
   await ensurePanelToolsVisible(page, 'styles')
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await page.locator('#render-mode').selectOption('react')
   await page.locator('#style-mode').selectOption('module')
   await expect(page.locator('#status')).toHaveText('Rendered')
@@ -678,7 +693,7 @@ test('renders in react mode with css modules', async ({ page }) => {
 test('transpiles TypeScript annotations in component source', async ({ page }) => {
   await waitForInitialRender(page)
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await setComponentEditorSource(
     page,
     [
@@ -762,7 +777,7 @@ test('react mode executes default React import without TDZ runtime failure', asy
 
   await ensurePanelToolsVisible(page, 'component')
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await page.locator('#render-mode').selectOption('react')
   await setComponentEditorSource(
     page,
@@ -854,7 +869,7 @@ test('renders with less style mode', async ({ page }) => {
 
   await ensurePanelToolsVisible(page, 'styles')
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await page.locator('#style-mode').selectOption('less')
   await expect(page.locator('#status')).toHaveText('Rendered')
   await expectPreviewHasRenderedContent(page)
@@ -865,7 +880,7 @@ test('renders with sass style mode', async ({ page }) => {
 
   await ensurePanelToolsVisible(page, 'styles')
 
-  await page.getByLabel('ShadowRoot (open)').uncheck()
+  await page.getByLabel('ShadowRoot').uncheck()
   await page.locator('#style-mode').selectOption('sass')
   await expect(page.locator('#status')).toHaveText('Rendered')
   await expectPreviewHasRenderedContent(page)

src/app.js

@@ -30,6 +30,7 @@ const aiChatDrawer = document.getElementById('ai-chat-drawer')
 const aiChatClose = document.getElementById('ai-chat-close')
 const aiChatClear = document.getElementById('ai-chat-clear')
 const aiChatPrompt = document.getElementById('ai-chat-prompt')
+const aiChatModel = document.getElementById('ai-chat-model')
 const aiChatIncludeEditors = document.getElementById('ai-chat-include-editors')
 const aiChatSend = document.getElementById('ai-chat-send')
 const aiChatStatus = document.getElementById('ai-chat-status')
@@ -477,6 +478,7 @@ const githubAiContextState = {
 let chatDrawerController = {
   setOpen: () => {},
   setSelectedRepository: () => {},
+  setToken: () => {},
   dispose: () => {},
 }
 
@@ -509,6 +511,7 @@ const byotControls = createGitHubByotControls({
   onTokenChange: token => {
     githubAiContextState.token = token
     syncAiChatTokenVisibility(token)
+    chatDrawerController.setToken(token)
   },
   setStatus,
 })
@@ -527,6 +530,7 @@ chatDrawerController = createGitHubChatDrawer({
   drawer: aiChatDrawer,
   closeButton: aiChatClose,
   promptInput: aiChatPrompt,
+  modelSelect: aiChatModel,
   includeEditorsContextToggle: aiChatIncludeEditors,
   sendButton: aiChatSend,
   clearButton: aiChatClear,

src/index.html

@@ -37,7 +37,7 @@ <h1>
           class="app-grid-ai-controls"
           id="github-ai-controls"
           role="group"
-          aria-label="GitHub AI controls"
+          aria-label="GitHub controls"
           hidden
         >
           <div class="github-token-control-wrap">
@@ -161,7 +161,7 @@ <h1>
             aria-controls="github-ai-controls"
             hidden
           >
-            Agent
+            GitHub
           </button>
         </div>
 
@@ -455,12 +455,12 @@ <h2>Preview</h2>
             </label>
             <label class="toggle">
               <input id="shadow-toggle" type="checkbox" checked />
-              ShadowRoot (open)
+              ShadowRoot
             </label>
             <button
               class="hint-icon shadow-hint"
               type="button"
-              aria-label="About ShadowRoot mode"
+              aria-label="About preview isolation mode"
               data-tooltip="Turning ShadowRoot off renders the preview in light DOM, so @knighted/develop styles can affect preview output."
             >
               i
@@ -544,9 +544,6 @@ <h2>AI Chat</h2>
         </div>
 
         <div class="ai-chat-drawer__meta">
-          <p class="ai-chat-drawer__repo" id="ai-chat-repository">
-            No repository selected
-          </p>
           <p class="ai-chat-drawer__status" id="ai-chat-status" data-level="neutral">
             Idle
           </p>
@@ -560,9 +557,16 @@ <h2>AI Chat</h2>
           class="ai-chat-prompt"
           id="ai-chat-prompt"
           rows="4"
-          placeholder="Ask about your selected repository context"
+          placeholder="Ask for help developing your component and styles"
         ></textarea>
 
+        <label class="ai-chat-model-picker" for="ai-chat-model">
+          <span class="sr-only">Model</span>
+          <select id="ai-chat-model" aria-label="Chat model" disabled>
+            <option value="openai/gpt-4.1-mini" selected>openai/gpt-4.1-mini</option>
+          </select>
+        </label>
+
         <label class="ai-chat-context-toggle" for="ai-chat-include-editors">
           <input type="checkbox" id="ai-chat-include-editors" checked />
           Send JSX + CSS editor context

src/modules/github-api.js

@@ -1,6 +1,53 @@
 const githubApiBaseUrl = 'https://api.github.com'
 const githubModelsApiUrl = 'https://models.github.ai/inference/chat/completions'
 
+export const defaultGitHubChatModel = 'openai/gpt-4.1-mini'
+
+/* Local model options avoid browser CORS failures when calling catalog endpoints directly. */
+export const githubChatModelOptions = [
+  'openai/gpt-4.1-mini',
+  'openai/gpt-4.1',
+  'openai/gpt-4.1-nano',
+  'openai/gpt-4o',
+  'openai/gpt-4o-mini',
+  'openai/gpt-5',
+  'openai/gpt-5-chat',
+  'openai/gpt-5-mini',
+  'openai/gpt-5-nano',
+  'openai/o1',
+  'openai/o1-mini',
+  'openai/o1-preview',
+  'openai/o3',
+  'openai/o3-mini',
+  'openai/o4-mini',
+  'ai21-labs/ai21-jamba-1.5-large',
+  'cohere/cohere-command-a',
+  'cohere/cohere-command-r-08-2024',
+  'cohere/cohere-command-r-plus-08-2024',
+  'xai/grok-3',
+  'xai/grok-3-mini',
+  'deepseek/deepseek-r1',
+  'deepseek/deepseek-r1-0528',
+  'deepseek/deepseek-v3-0324',
+  'meta/llama-3.2-11b-vision-instruct',
+  'meta/llama-3.2-90b-vision-instruct',
+  'meta/llama-3.3-70b-instruct',
+  'meta/llama-4-maverick-17b-128e-instruct-fp8',
+  'meta/llama-4-scout-17b-16e-instruct',
+  'meta/meta-llama-3.1-405b-instruct',
+  'meta/meta-llama-3.1-8b-instruct',
+  'mistral-ai/codestral-2501',
+  'mistral-ai/ministral-3b',
+  'mistral-ai/mistral-medium-2505',
+  'mistral-ai/mistral-small-2503',
+  'microsoft/mai-ds-r1',
+  'microsoft/phi-4',
+  'microsoft/phi-4-mini-instruct',
+  'microsoft/phi-4-mini-reasoning',
+  'microsoft/phi-4-multimodal-instruct',
+  'microsoft/phi-4-reasoning',
+]
+
 const parseNextPageUrlFromLinkHeader = linkHeader => {
   if (typeof linkHeader !== 'string' || !linkHeader.trim()) {
     return null
@@ -352,7 +399,7 @@ export const streamGitHubChatCompletion = async ({
   messages,
   signal,
   onToken,
-  model = 'openai/gpt-4.1-mini',
+  model = defaultGitHubChatModel,
 }) => {
   if (typeof token !== 'string' || token.trim().length === 0) {
     throw new Error('A GitHub token is required to start a chat request.')
@@ -385,6 +432,7 @@ export const streamGitHubChatCompletion = async ({
   const reader = response.body.getReader()
   let buffered = ''
   let combined = ''
+  let responseModel = ''
 
   while (true) {
     // eslint-disable-next-line no-await-in-loop
@@ -403,6 +451,10 @@ export const streamGitHubChatCompletion = async ({
         continue
       }
 
+      if (!responseModel && typeof body.model === 'string') {
+        responseModel = body.model
+      }
+
       const chunk = extractStreamingDeltaText(body)
       if (!chunk) {
         continue
@@ -415,6 +467,9 @@ export const streamGitHubChatCompletion = async ({
 
   if (buffered.trim()) {
     const body = parseSseDataLine(buffered)
+    if (body && !responseModel && typeof body.model === 'string') {
+      responseModel = body.model
+    }
     const chunk = body ? extractStreamingDeltaText(body) : ''
     if (chunk) {
       combined += chunk
@@ -428,6 +483,7 @@ export const streamGitHubChatCompletion = async ({
 
   return {
     content: combined,
+    model: responseModel || model,
     rateLimit: parseRateMetadata({ headers: response.headers, body: null }),
   }
 }
@@ -436,7 +492,7 @@ export const requestGitHubChatCompletion = async ({
   token,
   messages,
   signal,
-  model = 'openai/gpt-4.1-mini',
+  model = defaultGitHubChatModel,
 }) => {
   if (typeof token !== 'string' || token.trim().length === 0) {
     throw new Error('A GitHub token is required to start a chat request.')
@@ -470,6 +526,7 @@ export const requestGitHubChatCompletion = async ({
 
   return {
     content,
+    model: typeof body?.model === 'string' && body.model ? body.model : model,
     rateLimit: parseRateMetadata({ headers: response.headers, body }),
   }
 }