feat(tui): show Go allowance when a session costs nothing (#58565)

packages/tui/src/feature-plugins/prompt/footer.tsx

@@ -43,9 +43,12 @@ export function PromptFooter(props: {
       session.revert?.messageID,
     )
     const cost = props.context.data.session.cost(props.sessionID)
+    // A subscription such as OpenCode Go covers its requests from an allowance, so they cost nothing.
+    const allowance = props.context.data.session.allowance(props.sessionID)
     return [
       usage ? formatContextUsage(usage.tokens, usage.percent) : undefined,
       cost > 0 ? money.format(cost) : undefined,
+      allowance > 0 ? `${money.format(allowance)} allowance` : undefined,
     ].filter((item): item is string => Boolean(item))
   })
   const live = createMemo(() => Boolean(subagents() || shells()))

packages/tui/src/feature-plugins/sidebar/context.tsx

@@ -12,13 +12,14 @@ export function SidebarContext(props: { context: Plugin.Context; sessionID: stri
   const msg = createMemo(() => props.context.data.session.message.list(props.sessionID))
   const session = createMemo(() => props.context.data.session.get(props.sessionID))
   const cost = createMemo(() => props.context.data.session.cost(props.sessionID))
+  const allowance = createMemo(() => props.context.data.session.allowance(props.sessionID))
 
   const state = createMemo(() =>
     contextUsage(msg(), props.context.data.location.model.list(session()?.location), session()?.revert?.messageID),
   )
 
   return (
-    <Show when={state() || cost() > 0}>
+    <Show when={state() || cost() > 0 || allowance() > 0}>
       <box>
         <text fg={theme.text.base}>
           <b>Context</b>
@@ -36,6 +37,9 @@ export function SidebarContext(props: { context: Plugin.Context; sessionID: stri
         <Show when={cost() > 0}>
           <text fg={theme.text.muted}>{money.format(cost())} spent</text>
         </Show>
+        <Show when={allowance() > 0}>
+          <text fg={theme.text.muted}>{money.format(allowance())} allowance used</text>
+        </Show>
       </box>
     </Show>
   )

packages/tui/test/feature-plugins/prompt-footer.test.tsx

@@ -29,6 +29,7 @@ test("prompt footer separates simultaneous subagent, shell, and usage status", a
         status: (id: string) => (id === "child" ? "running" : "idle"),
         get: () => ({ id: "session", location: { directory: "/workspace" } }),
         cost: () => 1,
+        allowance: () => 0,
         message: { list: () => [] },
       },
       shell: {
@@ -87,6 +88,7 @@ test("prompt footer can hide details", async () => {
         status: () => "running",
         get: () => ({ id: "session", location: { directory: "/workspace" } }),
         cost: () => 1,
+        allowance: () => 0,
         message: {
           list: () => [
             {
@@ -142,3 +144,36 @@ test("prompt footer can hide details", async () => {
     app.renderer.destroy()
   }
 })
+
+test("prompt footer shows the allowance a subscription covered", async () => {
+  const color = RGBA.fromInts(200, 200, 200)
+  const context = {
+    location: { directory: "/workspace" },
+    theme: { text: { base: color, muted: color } },
+    keymap: { shortcuts: () => [] },
+    data: {
+      session: {
+        family: () => ["session"],
+        status: () => "idle",
+        get: () => ({ id: "session", location: { directory: "/workspace" } }),
+        cost: () => 0,
+        allowance: () => 0.42,
+        message: { list: () => [] },
+      },
+      shell: { list: () => [] },
+      location: { model: { list: () => [] } },
+    },
+  } as unknown as Context
+  const app = await testRender(
+    () => <PromptFooter context={context} sessionID="session" mode="normal" showDetails={true} />,
+    { width: 80, height: 1 },
+  )
+
+  try {
+    await app.renderOnce()
+    expect(app.captureCharFrame()).toContain("$0.42 allowance")
+    expect(app.captureCharFrame()).not.toContain("$0.00")
+  } finally {
+    app.renderer.destroy()
+  }
+})

packages/tui/test/feature-plugins/sidebar-context.test.tsx

@@ -5,7 +5,7 @@ import { testRender } from "@opentui/solid"
 import type { Context } from "@opencode/plugin/tui/context"
 import { SidebarContext } from "../../src/feature-plugins/sidebar/context"
 
-function context(options?: { cost?: number; tokens?: number }) {
+function context(options?: { cost?: number; allowance?: number; tokens?: number }) {
   const color = RGBA.fromInts(200, 200, 200)
   return {
     theme: { text: { base: color, muted: color } },
@@ -13,6 +13,7 @@ function context(options?: { cost?: number; tokens?: number }) {
       session: {
         get: () => ({ location: { directory: "/workspace" } }),
         cost: () => options?.cost ?? 0,
+        allowance: () => options?.allowance ?? 0,
         message: {
           list: () =>
             options?.tokens
@@ -68,3 +69,19 @@ test("sidebar shows available context usage", async () => {
     app.renderer.destroy()
   }
 })
+
+test("sidebar shows the allowance a subscription covered", async () => {
+  const app = await testRender(() => <SidebarContext context={context({ allowance: 0.42 })} sessionID="session" />, {
+    width: 42,
+    height: 8,
+  })
+
+  try {
+    await app.renderOnce()
+    expect(app.captureCharFrame()).toContain("Context")
+    expect(app.captureCharFrame()).toContain("$0.42 allowance used")
+    expect(app.captureCharFrame()).not.toContain("spent")
+  } finally {
+    app.renderer.destroy()
+  }
+})