From 4ad8116ce37a0e77e7f3c0e9e4e1002bba05b15e Mon Sep 17 00:00:00 2001
From: Adam <2363879+adamdotdevin@users.noreply.github.com>
Date: Fri, 13 Mar 2026 11:05:08 -0500
Subject: fix(app): model selection persist by session (#17348)

---
 .../e2e/session/session-model-persistence.spec.ts  | 351 +++++++++++++++++++++
 1 file changed, 351 insertions(+)
 create mode 100644 packages/app/e2e/session/session-model-persistence.spec.ts

(limited to 'packages/app/e2e/session')

diff --git a/packages/app/e2e/session/session-model-persistence.spec.ts b/packages/app/e2e/session/session-model-persistence.spec.ts
new file mode 100644
index 000000000..4b09a5287
--- /dev/null
+++ b/packages/app/e2e/session/session-model-persistence.spec.ts
@@ -0,0 +1,351 @@
+import { base64Decode } from "@opencode-ai/util/encode"
+import type { Locator, Page } from "@playwright/test"
+import { test, expect } from "../fixtures"
+import { openSidebar, sessionIDFromUrl, setWorkspacesEnabled, waitSessionIdle, waitSlug } from "../actions"
+import {
+  promptAgentSelector,
+  promptModelSelector,
+  promptSelector,
+  promptVariantSelector,
+  workspaceItemSelector,
+  workspaceNewSessionSelector,
+} from "../selectors"
+import { createSdk, sessionPath } from "../utils"
+
+type Footer = {
+  agent: string
+  model: string
+  variant: string
+}
+
+type Probe = {
+  dir?: string
+  sessionID?: string
+  model?: { providerID: string; modelID: string }
+}
+
+const escape = (value: string) => value.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")
+
+const text = async (locator: Locator) => ((await locator.textContent()) ?? "").trim()
+
+const modelKey = (state: Probe | null) => (state?.model ? `${state.model.providerID}:${state.model.modelID}` : null)
+
+const dirKey = (state: Probe | null) => state?.dir ?? ""
+
+async function probe(page: Page): Promise<Probe | null> {
+  return page.evaluate(() => {
+    const win = window as Window & {
+      __opencode_e2e?: {
+        model?: {
+          current?: Probe
+        }
+      }
+    }
+    return win.__opencode_e2e?.model?.current ?? null
+  })
+}
+
+async function currentDir(page: Page) {
+  let hit = ""
+  await expect
+    .poll(
+      async () => {
+        const next = dirKey(await probe(page))
+        if (next) hit = next
+        return next
+      },
+      { timeout: 30_000 },
+    )
+    .not.toBe("")
+  return hit
+}
+
+async function read(page: Page): Promise<Footer> {
+  return {
+    agent: await text(page.locator(`${promptAgentSelector} [data-slot="select-select-trigger-value"]`).first()),
+    model: await text(page.locator(`${promptModelSelector} [data-action="prompt-model"] span`).first()),
+    variant: await text(page.locator(`${promptVariantSelector} [data-slot="select-select-trigger-value"]`).first()),
+  }
+}
+
+async function waitFooter(page: Page, expected: Partial<Footer>) {
+  let hit: Footer | null = null
+  await expect
+    .poll(
+      async () => {
+        const state = await read(page)
+        const ok = Object.entries(expected).every(([key, value]) => state[key as keyof Footer] === value)
+        if (ok) hit = state
+        return ok
+      },
+      { timeout: 30_000 },
+    )
+    .toBe(true)
+  if (!hit) throw new Error("Failed to resolve prompt footer state")
+  return hit
+}
+
+async function waitModel(page: Page, value: string) {
+  await expect.poll(() => probe(page).then(modelKey), { timeout: 30_000 }).toBe(value)
+}
+
+async function choose(page: Page, root: string, value: string) {
+  const select = page.locator(root)
+  await expect(select).toBeVisible()
+  await select.locator('[data-action], [data-slot="select-select-trigger"]').first().click()
+  const item = page
+    .locator('[data-slot="select-select-item"]')
+    .filter({ hasText: new RegExp(`^\\s*${escape(value)}\\s*$`) })
+    .first()
+  await expect(item).toBeVisible()
+  await item.click()
+}
+
+async function variantCount(page: Page) {
+  const select = page.locator(promptVariantSelector)
+  await expect(select).toBeVisible()
+  await select.locator('[data-slot="select-select-trigger"]').click()
+  const count = await page.locator('[data-slot="select-select-item"]').count()
+  await page.keyboard.press("Escape")
+  return count
+}
+
+async function agents(page: Page) {
+  const select = page.locator(promptAgentSelector)
+  await expect(select).toBeVisible()
+  await select.locator('[data-action], [data-slot="select-select-trigger"]').first().click()
+  const labels = await page.locator('[data-slot="select-select-item-label"]').allTextContents()
+  await page.keyboard.press("Escape")
+  return labels.map((item) => item.trim()).filter(Boolean)
+}
+
+async function ensureVariant(page: Page, directory: string): Promise<Footer> {
+  const current = await read(page)
+  if ((await variantCount(page)) >= 2) return current
+
+  const cfg = await createSdk(directory)
+    .config.get()
+    .then((x) => x.data)
+  const visible = new Set(await agents(page))
+  const entry = Object.entries(cfg?.agent ?? {}).find((item) => {
+    const value = item[1]
+    return !!value && typeof value === "object" && "variant" in value && "model" in value && visible.has(item[0])
+  })
+  const name = entry?.[0]
+  test.skip(!name, "no agent with alternate variants available")
+  if (!name) return current
+
+  await choose(page, promptAgentSelector, name)
+  await expect.poll(() => variantCount(page), { timeout: 30_000 }).toBeGreaterThanOrEqual(2)
+  return waitFooter(page, { agent: name })
+}
+
+async function chooseDifferentVariant(page: Page): Promise<Footer> {
+  const current = await read(page)
+  const select = page.locator(promptVariantSelector)
+  await expect(select).toBeVisible()
+  await select.locator('[data-slot="select-select-trigger"]').click()
+
+  const items = page.locator('[data-slot="select-select-item"]')
+  const count = await items.count()
+  if (count < 2) throw new Error("Current model has no alternate variant to select")
+
+  for (let i = 0; i < count; i++) {
+    const item = items.nth(i)
+    const next = await text(item.locator('[data-slot="select-select-item-label"]').first())
+    if (!next || next === current.variant) continue
+    await item.click()
+    return waitFooter(page, { agent: current.agent, model: current.model, variant: next })
+  }
+
+  throw new Error("Failed to choose a different variant")
+}
+
+async function chooseOtherModel(page: Page): Promise<Footer> {
+  const current = await read(page)
+  const button = page.locator(`${promptModelSelector} [data-action="prompt-model"]`)
+  await expect(button).toBeVisible()
+  await button.click()
+
+  const dialog = page.getByRole("dialog")
+  await expect(dialog).toBeVisible()
+  const items = dialog.locator('[data-slot="list-item"]')
+  const count = await items.count()
+  expect(count).toBeGreaterThan(1)
+
+  for (let i = 0; i < count; i++) {
+    const item = items.nth(i)
+    const selected = (await item.getAttribute("data-selected")) === "true"
+    if (selected) continue
+    await item.click()
+    await expect(dialog).toHaveCount(0)
+    await expect.poll(async () => (await read(page)).model !== current.model, { timeout: 30_000 }).toBe(true)
+    return read(page)
+  }
+
+  throw new Error("Failed to choose a different model")
+}
+
+async function goto(page: Page, directory: string, sessionID?: string) {
+  await page.goto(sessionPath(directory, sessionID))
+  await expect(page.locator(promptSelector)).toBeVisible()
+  await expect.poll(async () => dirKey(await probe(page)), { timeout: 30_000 }).toBe(directory)
+}
+
+async function submit(page: Page, value: string) {
+  const prompt = page.locator(promptSelector)
+  await expect(prompt).toBeVisible()
+  await prompt.click()
+  await prompt.fill(value)
+  await prompt.press("Enter")
+
+  await expect.poll(() => sessionIDFromUrl(page.url()) ?? "", { timeout: 30_000 }).not.toBe("")
+  const id = sessionIDFromUrl(page.url())
+  if (!id) throw new Error(`Failed to resolve session id from ${page.url()}`)
+  return id
+}
+
+async function waitUser(directory: string, sessionID: string) {
+  const sdk = createSdk(directory)
+  await expect
+    .poll(
+      async () => {
+        const items = await sdk.session.messages({ sessionID, limit: 20 }).then((x) => x.data ?? [])
+        return items.some((item) => item.info.role === "user")
+      },
+      { timeout: 30_000 },
+    )
+    .toBe(true)
+  await sdk.session.abort({ sessionID }).catch(() => undefined)
+  await waitSessionIdle(sdk, sessionID, 30_000).catch(() => undefined)
+}
+
+async function createWorkspace(page: Page, root: string, seen: string[]) {
+  await openSidebar(page)
+  await page.getByRole("button", { name: "New workspace" }).first().click()
+
+  const slug = await waitSlug(page, [root, ...seen])
+  const directory = base64Decode(slug)
+  if (!directory) throw new Error(`Failed to decode workspace slug: ${slug}`)
+  return { slug, directory }
+}
+
+async function waitWorkspace(page: Page, slug: string) {
+  await openSidebar(page)
+  await expect
+    .poll(
+      async () => {
+        const item = page.locator(workspaceItemSelector(slug)).first()
+        try {
+          await item.hover({ timeout: 500 })
+          return true
+        } catch {
+          return false
+        }
+      },
+      { timeout: 60_000 },
+    )
+    .toBe(true)
+}
+
+async function newWorkspaceSession(page: Page, slug: string) {
+  await waitWorkspace(page, slug)
+  const item = page.locator(workspaceItemSelector(slug)).first()
+  await item.hover()
+
+  const button = page.locator(workspaceNewSessionSelector(slug)).first()
+  await expect(button).toBeVisible()
+  await button.click({ force: true })
+
+  const next = await waitSlug(page)
+  await expect(page).toHaveURL(new RegExp(`/${next}/session(?:[/?#]|$)`))
+  await expect(page.locator(promptSelector)).toBeVisible()
+  return currentDir(page)
+}
+
+test("session model and variant restore per session without leaking into new sessions", async ({
+  page,
+  withProject,
+}) => {
+  await page.setViewportSize({ width: 1440, height: 900 })
+
+  await withProject(async ({ directory, gotoSession, trackSession }) => {
+    await gotoSession()
+
+    await ensureVariant(page, directory)
+    const firstState = await chooseDifferentVariant(page)
+    const first = await submit(page, `session variant ${Date.now()}`)
+    trackSession(first)
+    await waitUser(directory, first)
+
+    await page.reload()
+    await expect(page.locator(promptSelector)).toBeVisible()
+    await waitFooter(page, firstState)
+
+    await gotoSession()
+    const fresh = await ensureVariant(page, directory)
+    expect(fresh.variant).not.toBe(firstState.variant)
+
+    const secondState = await chooseOtherModel(page)
+    const second = await submit(page, `session model ${Date.now()}`)
+    trackSession(second)
+    await waitUser(directory, second)
+
+    await goto(page, directory, first)
+    await waitFooter(page, firstState)
+
+    await goto(page, directory, second)
+    await waitFooter(page, secondState)
+
+    await gotoSession()
+    await waitFooter(page, fresh)
+  })
+})
+
+test("session model restore across workspaces", async ({ page, withProject }) => {
+  await page.setViewportSize({ width: 1440, height: 900 })
+
+  await withProject(async ({ directory: root, slug, gotoSession, trackDirectory, trackSession }) => {
+    await gotoSession()
+
+    await ensureVariant(page, root)
+    const firstState = await chooseDifferentVariant(page)
+    const first = await submit(page, `root session ${Date.now()}`)
+    trackSession(first, root)
+    await waitUser(root, first)
+
+    await openSidebar(page)
+    await setWorkspacesEnabled(page, slug, true)
+
+    const one = await createWorkspace(page, slug, [])
+    const oneDir = await newWorkspaceSession(page, one.slug)
+    trackDirectory(oneDir)
+
+    const secondState = await chooseOtherModel(page)
+    const second = await submit(page, `workspace one ${Date.now()}`)
+    trackSession(second, oneDir)
+    await waitUser(oneDir, second)
+
+    const two = await createWorkspace(page, slug, [one.slug])
+    const twoDir = await newWorkspaceSession(page, two.slug)
+    trackDirectory(twoDir)
+
+    await ensureVariant(page, twoDir)
+    const thirdState = await chooseDifferentVariant(page)
+    const third = await submit(page, `workspace two ${Date.now()}`)
+    trackSession(third, twoDir)
+    await waitUser(twoDir, third)
+
+    await goto(page, root, first)
+    await waitFooter(page, firstState)
+
+    await goto(page, oneDir, second)
+    await waitFooter(page, secondState)
+
+    await goto(page, twoDir, third)
+    await waitFooter(page, thirdState)
+
+    await goto(page, root, first)
+    await waitFooter(page, firstState)
+  })
+})
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