fix(sidebar): resolve stale per-session active account display

packages/opencode/src/index.ts

@@ -1373,6 +1373,7 @@ export async function CodexAuthPlugin(
 
         async function writeRequestSidebarRouting(
           sessionId: string | undefined,
+          parentSessionId: string | undefined,
           activeId: string,
           route: RoutingMode,
           accounts: readonly { id: string; enabled?: boolean }[],
@@ -1384,6 +1385,13 @@ export async function CodexAuthPlugin(
               accounts,
               boundSidebarFile,
             )
+            if (parentSessionId && parentSessionId !== sessionId) {
+              await upsertSidebarActiveRouting(
+                { sessionId: parentSessionId, ...input },
+                accounts,
+                boundSidebarFile,
+              )
+            }
             return
           }
           await setSidebarLegacyRouting(input, boundSidebarFile)
@@ -1981,9 +1989,10 @@ export async function CodexAuthPlugin(
         return {
           apiKey: OAUTH_DUMMY_KEY,
           async fetch(requestInput: RequestInfo | URL, init?: RequestInit) {
-            const sidebarSessionId = resolveSidebarSessionId(
-              effectiveRequestHeaders(requestInput, init),
-            )
+            const requestHeaders = effectiveRequestHeaders(requestInput, init)
+            const sidebarSessionId = resolveSidebarSessionId(requestHeaders)
+            const sidebarParentSessionId =
+              requestHeaders.get('x-parent-session-id')?.trim() || undefined
             // Routing is purely mode-driven. The primary is ALWAYS the main
             // account; fallback-first is handled by a proactive gate below that
             // tries usable fallbacks before main. There is no per-account pin.
@@ -2191,10 +2200,11 @@ export async function CodexAuthPlugin(
 
             await writeRequestSidebarRouting(
               sidebarSessionId,
+              sidebarParentSessionId,
               servedActiveId,
               mode,
               reqStorage?.accounts ?? [],
-            )
+            ).catch(() => {})
             return finalResponse
           },
           async dispose() {

packages/opencode/src/sidebar-state.ts

@@ -313,6 +313,22 @@ export function isUsableRoutingEntry(
   )
 }
 
+export function isQuotaExhausted(
+  quota: AccountQuota | null | undefined,
+  now = Date.now(),
+): boolean {
+  const primary = quota?.primary
+  if (
+    typeof primary?.resetsAt !== 'string' ||
+    !Number.isFinite(primary.usedPercent) ||
+    primary.usedPercent < 100
+  ) {
+    return false
+  }
+  const resetsAt = Date.parse(primary.resetsAt)
+  return Number.isFinite(resetsAt) && resetsAt > now
+}
+
 export function resolveSessionSidebarRouting(
   state: SidebarState,
   sessionId?: string,
@@ -322,13 +338,24 @@ export function resolveSessionSidebarRouting(
     return { activeId: state.activeId ?? 'main', route: state.route }
   }
   const own = sessionId ? state.activeRouting?.[sessionId] : undefined
-  if (own && isUsableRoutingEntry(own, state.fallbacks, now)) {
+  const ownQuota =
+    own?.activeId === 'main'
+      ? state.main.quota
+      : state.fallbacks.find((account) => account.id === own?.activeId)?.quota
+  if (
+    own &&
+    isUsableRoutingEntry(own, state.fallbacks, now) &&
+    !isQuotaExhausted(ownQuota, now)
+  ) {
     return { activeId: own.activeId, route: own.route }
   }
 
-  const fallback = state.fallbacks.find(
+  const enabledFallbacks = state.fallbacks.filter(
     (account) => account.enabled && !account.killed,
   )
+  const fallback =
+    enabledFallbacks.find((account) => !isQuotaExhausted(account.quota, now)) ??
+    enabledFallbacks[0]
   return {
     activeId:
       state.route === 'fallback-first' && fallback ? fallback.id : 'main',

packages/opencode/src/tests/integration.test.ts

@@ -1,5 +1,11 @@
 import { afterEach, beforeEach, describe, expect, it, test } from 'bun:test'
-import { mkdtempSync, readFileSync, writeFileSync } from 'node:fs'
+import {
+  mkdirSync,
+  mkdtempSync,
+  readFileSync,
+  renameSync,
+  writeFileSync,
+} from 'node:fs'
 import { readFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
@@ -420,6 +426,106 @@ describe('integration: HTTP quota push', () => {
     }
   })
 
+  it('records served routing for child and parent sessions', async () => {
+    writeFileSync(
+      configFile,
+      JSON.stringify({
+        version: 1,
+        main: { type: 'opencode', provider: 'openai' },
+        accounts: [],
+      }),
+    )
+
+    const originalFetch = globalThis.fetch
+    globalThis.fetch = (async () =>
+      new Response('{}', {
+        status: 200,
+        headers: { 'content-type': 'application/json' },
+      })) as unknown as typeof globalThis.fetch
+
+    let hooks: Hooks | undefined
+    try {
+      hooks = await CodexAuthPlugin(createMockPluginInput(), {
+        experimentalWebSockets: false,
+      })
+      const authHook = hooks.auth
+      if (!authHook?.loader) throw new Error('No auth loader')
+      const loaderResult = await authHook.loader(
+        async () => ({
+          type: 'oauth' as const,
+          provider: 'openai',
+          access: accessToken,
+          refresh: refreshToken,
+          expires: Date.now() + 3600_000,
+        }),
+        {
+          id: 'openai',
+          label: 'OpenAI',
+          models: [],
+        } as unknown as Parameters<NonNullable<(typeof authHook)['loader']>>[1],
+      )
+      const fetchOverride = (loaderResult as Record<string, unknown>).fetch as
+        | ((url: RequestInfo | URL, init?: RequestInit) => Promise<Response>)
+        | undefined
+      if (!fetchOverride) throw new Error('No fetch in loader result')
+
+      const serve = async (sessionId: string, parentId?: string) => {
+        const headers = new Headers({
+          'content-type': 'application/json',
+          'session-id': sessionId,
+        })
+        if (parentId) headers.set('x-parent-session-id', parentId)
+        const response = await fetchOverride(
+          'https://api.openai.com/v1/responses',
+          {
+            method: 'POST',
+            headers,
+            body: JSON.stringify({ model: 'gpt-5.5', input: [] }),
+          },
+        )
+        expect(response.status).toBe(200)
+        await response.body?.cancel()
+      }
+
+      await serve('child-session', 'parent-session')
+      await serve('child-only-session')
+      await serve('same-session', 'same-session')
+      await drainSidebarWrites()
+
+      const sidebar = normalizeSidebarState(
+        JSON.parse(readFileSync(sidebarFile, 'utf8')),
+      )
+      expect(Object.keys(sidebar.activeRouting ?? {}).sort()).toEqual([
+        'child-only-session',
+        'child-session',
+        'parent-session',
+        'same-session',
+      ])
+      expect(sidebar.activeRouting?.['child-session']).toMatchObject({
+        activeId: 'main',
+        route: 'main-first',
+      })
+      expect(sidebar.activeRouting?.['parent-session']).toEqual(
+        sidebar.activeRouting?.['child-session'],
+      )
+      expect(sidebar.activeRouting?.['child-only-session']).toMatchObject({
+        activeId: 'main',
+        route: 'main-first',
+      })
+      expect(sidebar.activeRouting?.['same-session']).toMatchObject({
+        activeId: 'main',
+        route: 'main-first',
+      })
+
+      renameSync(sidebarFile, `${sidebarFile}.saved`)
+      mkdirSync(sidebarFile)
+      await serve('unwritable-child', 'unwritable-parent')
+    } finally {
+      globalThis.fetch = originalFetch
+      await hooks?.dispose?.()
+    }
+  })
+
   it('a complete header frame reporting every window retired clears cached windows', async () => {
     const store = {
       version: 1,