fix(core): request copilot raw usage chunks

packages/ai/src/protocols/openai-chat.ts

@@ -157,6 +157,7 @@ const OpenAIChatUsage = Schema.StructWithRest(
     prompt_tokens: optionalNull(Schema.Number),
     completion_tokens: optionalNull(Schema.Number),
     total_tokens: optionalNull(Schema.Number),
+    cost: optionalNull(Schema.Number),
     prompt_tokens_details: optionalNull(
       Schema.StructWithRest(
         Schema.Struct({
@@ -595,6 +596,7 @@ const mapUsage = (usage: OpenAIChatEvent["usage"]): Usage | undefined => {
     cacheWriteInputTokens: cacheWrite,
     reasoningTokens: reasoning,
     totalTokens: ProviderShared.totalTokens(input, output, usage.total_tokens ?? undefined),
+    cost: usage.cost ?? undefined,
     providerMetadata: { openai: usage },
   })
 }

packages/ai/src/schema/events.ts

@@ -56,6 +56,8 @@ export class Usage extends Schema.Class<Usage>("AI.Usage")({
   cacheWriteInputTokens: Schema.optional(Schema.Number),
   reasoningTokens: Schema.optional(Schema.Number),
   totalTokens: Schema.optional(Schema.Number),
+  /** Provider-reported cost for this physical request, normalized to USD. */
+  cost: Schema.optional(Schema.Number),
   providerMetadata: Schema.optional(ProviderMetadata),
 }) {
   /**

packages/ai/test/provider/openrouter.test.ts

@@ -246,6 +246,24 @@ describe("OpenRouter", () => {
     }),
   )
 
+  it.effect("reports OpenRouter's streamed USD cost", () =>
+    Effect.gen(function* () {
+      const model = OpenRouter.configure({ apiKey: "test-key" }).model("openai/gpt-4o-mini")
+      const response = yield* LLMClient.generate(LLM.request({ model, prompt: "Say hello." })).pipe(
+        Effect.provide(
+          fixedResponse(
+            sseEvents({
+              choices: [{ delta: { content: "Hello" }, finish_reason: "stop" }],
+              usage: { prompt_tokens: 10, completion_tokens: 2, total_tokens: 12, cost: 0.00123 },
+            }),
+          ),
+        ),
+      )
+
+      expect(response.usage?.cost).toBe(0.00123)
+    }),
+  )
+
   it.effect("fails on a mid-stream provider error", () =>
     Effect.gen(function* () {
       const model = OpenRouter.configure({ apiKey: "test-key" }).model("openai/gpt-4o-mini")

packages/core/src/aisdk.ts

@@ -343,7 +343,8 @@ function modelFromLanguage(info: Info, language: LanguageModelV3) {
     model: (input) =>
       LanguageModel.make({ ...input, provider: "provider" in input ? input.provider : info.providerID, route }),
     prepareTransport: (body) => Effect.succeed(body),
-    streamPrepared: (prepared) => streamLanguage(language, prepared as LanguageModelV3CallOptions),
+    streamPrepared: (prepared) =>
+      streamLanguage(language, prepared as LanguageModelV3CallOptions, info.providerID === Provider.ID.githubCopilot),
   }
   return LanguageModel.make({
     id: info.modelID ?? info.id,
@@ -427,6 +428,7 @@ function callOptions(request: LLMRequest): LanguageModelV3CallOptions {
     toolChoice: toolChoice(request.toolChoice),
     headers: request.http?.headers,
     providerOptions: providerOptions(request.providerOptions),
+    includeRawChunks: request.model.provider === ProviderID.make(Provider.ID.githubCopilot),
   }
 }
 
@@ -547,8 +549,15 @@ function providerOptions(input: LLMRequest["providerOptions"]): SharedV3Provider
   return Object.fromEntries(Object.entries(input).map(([key, value]) => [key, jsonObject(value)]))
 }
 
-function streamLanguage(language: LanguageModelV3, options: LanguageModelV3CallOptions) {
-  const state = { step: 0, toolNames: {} as Record<string, string> }
+interface StreamState {
+  step: number
+  toolNames: Record<string, string>
+  copilot: boolean
+  cost?: number
+}
+
+function streamLanguage(language: LanguageModelV3, options: LanguageModelV3CallOptions, copilot: boolean) {
+  const state: StreamState = { step: 0, toolNames: {}, copilot }
   return Stream.concat(
     Stream.make(LLMEvent.stepStart({ index: state.step })),
     Stream.unwrap(
@@ -571,17 +580,19 @@ function streamLanguage(language: LanguageModelV3, options: LanguageModelV3CallO
 }
 
 function streamPartEvents(
-  state: { step: number; toolNames: Record<string, string> },
+  state: StreamState,
   event: LanguageModelV3StreamPart,
 ): Effect.Effect<ReadonlyArray<LLMEvent>, AIError> {
   switch (event.type) {
     case "stream-start":
     case "response-metadata":
-    case "raw":
     case "file":
     case "source":
     case "tool-approval-request":
       return Effect.succeed([])
+    case "raw":
+      if (state.copilot) state.cost = copilotCost(event.rawValue) ?? state.cost
+      return Effect.succeed([])
     case "text-start":
       return Effect.succeed([
         LLMEvent.textStart({ id: event.id, providerMetadata: providerMetadata(event.providerMetadata) }),
@@ -672,16 +683,18 @@ function streamPartEvents(
         }),
       ])
     case "finish":
+      const normalized = usage(event.usage, state.cost)
+      state.cost = undefined
       return Effect.succeed([
         LLMEvent.stepFinish({
           index: state.step++,
           reason: { normalized: finishReason(event.finishReason), raw: event.finishReason.raw },
-          usage: usage(event.usage),
+          usage: normalized,
           providerMetadata: providerMetadata(event.providerMetadata),
         }),
         LLMEvent.finish({
           reason: { normalized: finishReason(event.finishReason), raw: event.finishReason.raw },
-          usage: usage(event.usage),
+          usage: normalized,
           providerMetadata: providerMetadata(event.providerMetadata),
         }),
       ])
@@ -690,7 +703,10 @@ function streamPartEvents(
   }
 }
 
-function usage(input: Extract<LanguageModelV3StreamPart, { type: "finish" }>["usage"]): UsageInput | undefined {
+function usage(
+  input: Extract<LanguageModelV3StreamPart, { type: "finish" }>["usage"],
+  cost?: number,
+): UsageInput | undefined {
   const output = {
     inputTokens: input.inputTokens.total,
     nonCachedInputTokens: input.inputTokens.noCache,
@@ -702,10 +718,22 @@ function usage(input: Extract<LanguageModelV3StreamPart, { type: "finish" }>["us
       input.inputTokens.total === undefined || input.outputTokens.total === undefined
         ? undefined
         : input.inputTokens.total + input.outputTokens.total,
+    cost,
   }
   return Object.values(output).some((value) => value !== undefined) ? output : undefined
 }
 
+function copilotCost(input: unknown): number | undefined {
+  if (!ProviderShared.isRecord(input)) return undefined
+  const raw = input
+  const response = ProviderShared.isRecord(raw.response) ? raw.response : undefined
+  const usage = raw.copilot_usage ?? response?.copilot_usage
+  if (!ProviderShared.isRecord(usage)) return undefined
+  const total = usage.total_nano_aiu
+  if (typeof total !== "number" || !Number.isFinite(total) || total < 0) return undefined
+  return total / 100_000_000_000
+}
+
 function finishReason(value: LanguageModelV3FinishReason): FinishReason {
   return value.unified === "other" ? "unknown" : value.unified
 }

packages/core/src/session/runner/llm.ts

@@ -272,10 +272,8 @@ const layer = Layer.effect(
         snapshot: startSnapshot,
         assistantMessageID,
       })
-      const stepUsage = (finish: NonNullable<StepRecord["finish"]>) => ({
-        cost: SessionUsage.calculateCost(resolved.cost, finish.tokens),
-        tokens: finish.tokens,
-      })
+      const stepUsage = (finish: NonNullable<StepRecord["finish"]>) =>
+        SessionUsage.record(finish.usage, resolved.cost)
 
       const captureStepEnd = Effect.fnUntraced(function* () {
         const snapshot = yield* snapshots.capture()

packages/core/src/session/runner/publish-llm-event.ts

@@ -35,7 +35,7 @@ export interface StepRecord {
   /** Present once the provider finished the step normally. */
   readonly finish?: {
     readonly finish: Extract<LLMEvent, { type: "step-finish" }>["reason"]["normalized"]
-    readonly tokens: ReturnType<typeof SessionUsage.tokens>
+    readonly usage: Extract<LLMEvent, { type: "step-finish" }>["usage"]
   }
   readonly calls: ReadonlyArray<{
     readonly id: string
@@ -495,7 +495,7 @@ export const createLLMEventPublisher = (bus: Pick<Bus.Interface, "publish">, inp
       case "step-finish":
         yield* flush()
         if (stepSettlement) return yield* Effect.die(new Error("Duplicate step finish"))
-        stepSettlement = { finish: event.reason.normalized, tokens: SessionUsage.tokens(event.usage) }
+        stepSettlement = { finish: event.reason.normalized, usage: event.usage }
         if (event.reason.normalized === "content-filter") {
           providerFailed = true
           yield* failAssistant({ type: "provider.content-filter", message: "Provider blocked the response" })

packages/core/src/session/usage.ts

@@ -17,7 +17,6 @@ export const tokens = (usage: Usage | undefined): TokenUsage.Info => ({
   },
 })
 
-// TODO(#35765): Use Copilot's reported billed amount once billing has a dedicated typed runtime contract.
 export function calculateCost(costs: Model.Info["cost"], usage: TokenUsage.Info) {
   const context = usage.input + usage.cache.read + usage.cache.write
   const tier = costs
@@ -38,7 +37,14 @@ export type Recorded = { readonly tokens: TokenUsage.Info; readonly cost: Money.
 
 export const record = (usage: Usage | undefined, costs: Model.Info["cost"]): Recorded => {
   const normalized = tokens(usage)
-  return { tokens: normalized, cost: calculateCost(costs, normalized) }
+  const reported = usage?.cost
+  return {
+    tokens: normalized,
+    cost:
+      reported !== undefined && Number.isFinite(reported) && reported >= 0
+        ? Money.USD.make(reported)
+        : calculateCost(costs, normalized),
+  }
 }
 
 export const add = (a: Recorded, b: Recorded): Recorded => ({

packages/core/test/aisdk.test.ts

@@ -1,5 +1,5 @@
 import { APICallError } from "@ai-sdk/provider"
-import type { LanguageModelV3, LanguageModelV3StreamPart } from "@ai-sdk/provider"
+import type { LanguageModelV3, LanguageModelV3CallOptions, LanguageModelV3StreamPart } from "@ai-sdk/provider"
 import { AISDK } from "@opencode-ai/core/aisdk"
 import { SessionRunnerRetry } from "@opencode-ai/core/session/runner/retry"
 import { toSessionError } from "@opencode-ai/core/session/to-session-error"
@@ -23,21 +23,26 @@ const model = (packageName: string, settings: Record<string, unknown> = {}) =>
     limit: { context: 100, output: 20 },
   })
 
-const streamModel = (events: ReadonlyArray<LanguageModelV3StreamPart>): LanguageModelV3 => ({
+const streamModel = (
+  events: ReadonlyArray<LanguageModelV3StreamPart>,
+  inspect?: (options: LanguageModelV3CallOptions) => void,
+): LanguageModelV3 => ({
   specificationVersion: "v3",
   provider: "test",
   modelId: "test",
   supportedUrls: {},
   doGenerate: () => Promise.reject(new Error("Unexpected non-streaming request")),
-  doStream: () =>
-    Promise.resolve({
+  doStream: (options) => {
+    inspect?.(options)
+    return Promise.resolve({
       stream: new ReadableStream({
         start(controller) {
           events.forEach((event) => controller.enqueue(event))
           controller.close()
         },
       }),
-    }),
+    })
+  },
 })
 
 const usage = {
@@ -375,6 +380,41 @@ it.effect("emits malformed AI SDK tool input without executing it", () =>
   }),
 )
 
+it.effect("normalizes Copilot billed usage to USD", () =>
+  Effect.gen(function* () {
+    const aisdk = yield* AISDK.Service
+    let options: LanguageModelV3CallOptions | undefined
+    yield* aisdk.hook.sdk((event) => {
+      event.sdk = {
+        languageModel: () =>
+          streamModel(
+            [
+              {
+                type: "raw",
+                rawValue: { type: "message_delta", copilot_usage: { total_nano_aiu: 4_473_525_000 } },
+              },
+              { type: "finish", finishReason: { unified: "stop", raw: "end_turn" }, usage },
+            ],
+            (input) => {
+              options = input
+            },
+          ),
+      }
+    })
+
+    const resolved = yield* aisdk.model({
+      ...model("@ai-sdk/github-copilot"),
+      providerID: Provider.ID.githubCopilot,
+    })
+    const response = yield* LLMClient.generate(LLM.request({ model: resolved, prompt: "Hello" })).pipe(
+      Effect.provide(client),
+    )
+
+    expect(options?.includeRawChunks).toBeTrue()
+    expect(response.usage?.cost).toBeCloseTo(0.04473525)
+  }),
+)
+
 it.effect("keeps malformed provider-executed AI SDK input terminal", () =>
   Effect.gen(function* () {
     const aisdk = yield* AISDK.Service

packages/core/test/session-runner-tool-events.test.ts

@@ -1,7 +1,6 @@
 import { expect, test } from "bun:test"
 import { Cause, Effect, Exit, Schema } from "effect"
 import { LLMEvent } from "@opencode-ai/ai"
-import { Money } from "@opencode-ai/schema/money"
 import { Bus } from "@opencode-ai/core/bus"
 import { Event } from "@opencode-ai/schema/event"
 import { Agent } from "@opencode-ai/core/agent"
@@ -13,6 +12,7 @@ import { Provider } from "@opencode-ai/core/provider"
 import { RelativePath } from "@opencode-ai/core/schema"
 import { Snapshot } from "@opencode-ai/core/snapshot"
 import { createLLMEventPublisher } from "@opencode-ai/core/session/runner/publish-llm-event"
+import { SessionUsage } from "@opencode-ai/core/session/usage"
 
 const sessionID = Session.ID.make("ses_tool_event_test")
 const base64 = "iVBORw0KGgoAAAANSUhEUgAAAAEAAAAB"
@@ -280,6 +280,7 @@ test("content-filter finish retains failure evidence until step closeout", async
           nonCachedInputTokens: 8,
           outputTokens: 3,
           reasoningTokens: 1,
+          cost: 1.25,
         },
       }),
     ),
@@ -289,13 +290,13 @@ test("content-filter finish retains failure evidence until step closeout", async
   const settlement = publisher.record().finish
   expect(settlement).toMatchObject({
     finish: "content-filter",
-    tokens: { input: 8, output: 2, reasoning: 1 },
+    usage: { nonCachedInputTokens: 8, outputTokens: 3, reasoningTokens: 1, cost: 1.25 },
   })
   if (!settlement) throw new Error("Expected content-filter settlement")
+  const recorded = SessionUsage.record(settlement.usage, [])
   await Effect.runPromise(
     publisher.publishStepFailure({
-      cost: Money.USD.make(1.25),
-      tokens: settlement.tokens,
+      ...recorded,
       snapshot: Snapshot.ID.make("tree-end"),
       files: [RelativePath.make("src/changed.ts")],
     }),

packages/core/test/session-usage.test.ts

@@ -0,0 +1,28 @@
+import { expect, test } from "bun:test"
+import { Usage } from "@opencode-ai/ai"
+import { Money } from "@opencode-ai/schema/money"
+import { SessionUsage } from "@opencode-ai/core/session/usage"
+
+const costs = [
+  {
+    input: Money.USDPerMillionTokens.make(1),
+    output: Money.USDPerMillionTokens.make(2),
+    cache: { read: Money.USDPerMillionTokens.zero, write: Money.USDPerMillionTokens.zero },
+  },
+]
+
+test("prefers provider-reported cost", () => {
+  expect(SessionUsage.record(new Usage({ nonCachedInputTokens: 1_000_000, cost: 0.25 }), costs).cost).toBe(
+    Money.USD.make(0.25),
+  )
+  expect(SessionUsage.record(new Usage({ nonCachedInputTokens: 1_000_000, cost: 0 }), costs).cost).toBe(Money.USD.zero)
+})
+
+test("falls back to catalog pricing for invalid reported cost", () => {
+  expect(SessionUsage.record(new Usage({ nonCachedInputTokens: 1_000_000, cost: Number.NaN }), costs).cost).toBe(
+    Money.USD.make(1),
+  )
+  expect(SessionUsage.record(new Usage({ nonCachedInputTokens: 1_000_000, cost: -1 }), costs).cost).toBe(
+    Money.USD.make(1),
+  )
+})

packages/tui/src/app.tsx

@@ -38,6 +38,7 @@ import {
   TuiStartupProvider,
   TuiTerminalEnvironmentProvider,
   useTuiApp,
+  useTuiPaths,
   useTuiStartup,
   type TuiApp,
 } from "./context/runtime"
@@ -85,6 +86,7 @@ import { ArgsProvider, useArgs, type Args } from "./context/args"
 import open from "open"
 import { PromptRefProvider, usePromptRef } from "./context/prompt"
 import { Config, ConfigProvider, useConfig } from "./config"
+import { newSessionLocation } from "./config/new-session-location"
 import { PluginProvider, usePlugin, type PackageResolver } from "./plugin/context"
 import { tuiPluginDirectories } from "./plugin/discovery"
 import { PluginRoute, Slot } from "./plugin/render"
@@ -453,6 +455,7 @@ function App(props: { pair?: DialogPairCredentials }) {
   const log = useLog({ component: "app" })
   const app = useTuiApp()
   const startup = useTuiStartup()
+  const paths = useTuiPaths()
   const config = useConfig()
   const devtools = createMemo(() => config.data.debug?.devtools ?? app.channel === "local")
   const route = useRoute()
@@ -659,10 +662,13 @@ function App(props: { pair?: DialogPairCredentials }) {
         run: () => {
           route.navigate({
             type: "home",
-            location:
+            location: newSessionLocation(
+              config.data.session.new_location,
+              paths.cwd,
               route.data.type === "session"
                 ? (data.session.get(route.data.sessionID)?.location ?? location.ref)
                 : undefined,
+            ),
           })
           dialog.clear()
         },

packages/tui/src/component/devtools-bar.tsx

@@ -384,16 +384,18 @@ export function DevToolsBar() {
               >
                 {turnTokens() ? "[x]" : "[ ]"} Turn token usage
               </Action>
-              <Action
-                onClick={() =>
-                  void config.update((draft) => {
-                    draft.debug = { ...draft.debug, turn_tokens: verboseTurnTokens() ? true : "verbose" }
-                  })
-                }
-                hoverBackground
-              >
-                {verboseTurnTokens() ? "[x]" : "[ ]"} Turn token usage (verbose)
-              </Action>
+              <Show when={Boolean(turnTokens())}>
+                <Action
+                  onClick={() =>
+                    void config.update((draft) => {
+                      draft.debug = { ...draft.debug, turn_tokens: verboseTurnTokens() ? true : "verbose" }
+                    })
+                  }
+                  hoverBackground
+                >
+                  {verboseTurnTokens() ? "[x]" : "[ ]"} Turn token usage (verbose)
+                </Action>
+              </Show>
             </box>
             <For each={groups()}>
               {(group) => (

packages/tui/src/component/dialog-config.tsx

@@ -93,6 +93,15 @@ export const settings: Setting[] = [
     labels: ["off", "on"],
     keywords: ["attachments", "images", "tool output"],
   },
+  {
+    title: "New session location",
+    category: "Session",
+    path: ["session", "new_location"],
+    default: "launch",
+    values: ["launch", "inherit"],
+    labels: ["launch directory", "active session"],
+    keywords: ["directory", "cwd", "inherit"],
+  },
   {
     title: "Enabled",
     category: "Tabs",

packages/tui/src/config/index.tsx

@@ -137,6 +137,9 @@ export const Info = Schema.Struct({
       markdown: Schema.optional(Schema.Literals(["source", "rendered"])).annotate({
         description: "Show Markdown syntax markers or conceal them in rendered transcript content",
       }),
+      new_location: Schema.optional(Schema.Literals(["launch", "inherit"])).annotate({
+        description: "Start new sessions in the TUI launch directory or inherit the active session location",
+      }),
     }),
   ).annotate({ description: "Session transcript presentation settings" }),
   tabs: Schema.optional(
@@ -202,7 +205,7 @@ export const Info = Schema.Struct({
 })
 export type Info = Schema.Schema.Type<typeof Info>
 
-export type Resolved = Omit<Info, "attention" | "cursor" | "keybinds" | "leader" | "mouse" | "tabs"> & {
+export type Resolved = Omit<Info, "attention" | "cursor" | "keybinds" | "leader" | "mouse" | "session" | "tabs"> & {
   attention: {
     enabled: boolean
     notifications: boolean
@@ -218,6 +221,9 @@ export type Resolved = Omit<Info, "attention" | "cursor" | "keybinds" | "leader"
     style: "block" | "underline" | "line" | "default"
     blinking: boolean
   }
+  session: Omit<NonNullable<Info["session"]>, "new_location"> & {
+    new_location: "launch" | "inherit"
+  }
   tabs: {
     enabled: boolean
     scope: "global" | "cwd"
@@ -259,6 +265,10 @@ export function resolve(input: Info, options: { terminalSuspend: boolean }): Res
           blinking: input.cursor.blinking ?? true,
         }
       : undefined,
+    session: {
+      ...input.session,
+      new_location: input.session?.new_location ?? "launch",
+    },
     tabs: {
       ...input.tabs,
       enabled: input.tabs?.enabled ?? true,

packages/tui/src/config/new-session-location.ts

@@ -0,0 +1,10 @@
+import type { LocationRef } from "@opencode-ai/client/promise"
+
+export function newSessionLocation(
+  mode: "launch" | "inherit",
+  launchDirectory: string,
+  current?: LocationRef,
+): LocationRef {
+  if (mode === "inherit" && current) return current
+  return { directory: launchDirectory }
+}

packages/tui/src/mini/runtime.ts

@@ -11,6 +11,7 @@
 import { SessionMessage } from "@opencode-ai/schema/session-message"
 import type { LocationRef } from "@opencode-ai/client/promise"
 import type { Config } from "../config"
+import { newSessionLocation } from "../config/new-session-location"
 import { loadRunAgents, loadRunCommands, loadRunReferences } from "./catalog.shared"
 import {
   resolveMiniSettings,
@@ -48,6 +49,7 @@ type Reconnect = (signal: AbortSignal) => Promise<RunInput["sdk"]>
 
 type RunRuntimeInput = {
   host: MiniHost
+  directory: string
   boot: () => Promise<BootContext>
   resolveSession: (sdk: RunInput["sdk"], signal: AbortSignal) => Promise<ResolvedSession>
   createSession?: CreateSession
@@ -941,7 +943,11 @@ async function runInteractiveRuntime(input: RunRuntimeInput, deps: RunRuntimeDep
               const created = await createSession(
                 state.sdk,
                 {
-                  location: state.location,
+                  location: newSessionLocation(
+                    (await tuiConfigTask).session.new_location,
+                    input.directory,
+                    state.location,
+                  ),
                   agent: state.agent,
                   model: state.model,
                   variant: state.activeVariant,
@@ -1099,6 +1105,7 @@ export async function runInteractiveDeferredMode(input: RunDeferredInput, deps?:
   return runInteractiveRuntime(
     {
       host: input.host,
+      directory: input.directory,
       files: input.files,
       initialInput: input.initialInput,
       thinking: input.thinking,

packages/tui/src/mini/types.ts

@@ -392,7 +392,7 @@ export type FormCancel = {
   location?: LocationRef
 }
 
-export type RunTuiConfig = Pick<Config.Resolved, "keybinds" | "leader" | "theme" | "mini">
+export type RunTuiConfig = Pick<Config.Resolved, "keybinds" | "leader" | "theme" | "mini" | "session">
 
 export type MiniSettings = {
   thinking: "show" | "hide"

packages/tui/src/routes/session/index.tsx

@@ -1222,6 +1222,11 @@ function TurnTokenUsage(props: {
 }) {
   const config = useConfig()
   const theme = useTheme()
+  const renderer = useRenderer()
+  // Collapsed by default: one summary line for the whole turn. Click to
+  // open the full per-step table, click again to close.
+  const [expanded, setExpanded] = createSignal(false)
+  const [hover, setHover] = createSignal(false)
   const verbose = () => config.data.debug?.turn_tokens === "verbose"
   const steps = createMemo(() => {
     let previousCache = props.previousCache
@@ -1257,49 +1262,78 @@ function TurnTokenUsage(props: {
     cached: Math.max("Cached".length, ...steps().map((item) => item.cached.toLocaleString().length)),
     total: Math.max("Total".length, ...steps().map((item) => item.total.toLocaleString().length)),
   }))
+  const summary = createMemo(() => {
+    const items = steps()
+    const last = items[items.length - 1]
+    return {
+      count: items.length,
+      newTokens: items.reduce((sum, item) => sum + item.newTokens, 0),
+      cached: last?.cached ?? 0,
+      total: last?.total ?? 0,
+      reuseDrops: items.filter((item) => item.reuseDrop !== undefined).length,
+    }
+  })
   return (
     <Show when={Boolean(config.data.debug?.turn_tokens) && steps().length > 0}>
       <box paddingLeft={3} flexDirection="column">
-        <box flexDirection="row">
-          <text width={INLINE_TOOL_ICON_WIDTH} fg={theme.text.subdued}>
-            ◈
-          </text>
-          <text fg={theme.text.subdued} attributes={TextAttributes.BOLD}>
-            Tokens
+        <box
+          flexDirection="row"
+          onMouseOver={() => setHover(true)}
+          onMouseOut={() => setHover(false)}
+          onMouseUp={() => {
+            if (renderer.getSelection()?.getSelectedText()) return
+            setExpanded((value) => !value)
+          }}
+        >
+          <text fg={hover() ? theme.text.default : theme.text.subdued} wrapMode="none">
+            <span>{expanded() ? "- " : "+ "}</span>
+            <span style={{ attributes: TextAttributes.BOLD }}>Tokens</span>
+            <span>
+              : {summary().count} {summary().count === 1 ? "step" : "steps"} · {summary().newTokens.toLocaleString()}{" "}
+              new · {summary().cached.toLocaleString()} cached · {summary().total.toLocaleString()} total
+            </span>
+            <Show when={summary().reuseDrops > 0}>
+              <span style={{ fg: theme.text.feedback.warning.default }}>
+                {" "}
+                · ! {summary().reuseDrops} likely cache {summary().reuseDrops === 1 ? "bust" : "busts"}
+              </span>
+            </Show>
           </text>
         </box>
-        <box paddingLeft={INLINE_TOOL_ICON_WIDTH}>
-          <text fg={theme.text.subdued} attributes={TextAttributes.ITALIC}>
-            {"Step".padEnd(columns().step + 2)}
-            {"New".padStart(columns().newTokens)}
-            {"  "}
-            {"Cached".padStart(columns().cached)}
-            {"  "}
-            {"Total".padStart(columns().total)}
-          </text>
-        </box>
-        <For each={steps()}>
-          {(item) => (
-            <box paddingLeft={INLINE_TOOL_ICON_WIDTH} flexDirection="column">
-              <text fg={verbose() && item.finish === "tool-call" ? undefined : theme.text.subdued}>
-                {item.finish.padEnd(columns().step + 2)}
-                <span style={{ attributes: TextAttributes.BOLD }}>
-                  {item.newTokens.toLocaleString().padStart(columns().newTokens)}
-                </span>
-                {"  "}
-                {item.cached.toLocaleString().padStart(columns().cached)}
-                {"  "}
-                {item.total.toLocaleString().padStart(columns().total)}
-              </text>
-              <TurnTokenToolCalls tools={item.tools} />
-              <Show when={item.reuseDrop !== undefined}>
-                <text fg={theme.text.feedback.warning.default}>
-                  ! Likely cache bust: {item.reuseDrop?.toLocaleString()} fewer cached tokens than the previous step
+        <Show when={expanded()}>
+          <box paddingLeft={INLINE_TOOL_ICON_WIDTH}>
+            <text fg={theme.text.subdued} attributes={TextAttributes.ITALIC}>
+              {"Step".padEnd(columns().step + 2)}
+              {"New".padStart(columns().newTokens)}
+              {"  "}
+              {"Cached".padStart(columns().cached)}
+              {"  "}
+              {"Total".padStart(columns().total)}
+            </text>
+          </box>
+          <For each={steps()}>
+            {(item) => (
+              <box paddingLeft={INLINE_TOOL_ICON_WIDTH} flexDirection="column">
+                <text fg={verbose() && item.finish === "tool-call" ? undefined : theme.text.subdued}>
+                  {item.finish.padEnd(columns().step + 2)}
+                  <span style={{ attributes: TextAttributes.BOLD }}>
+                    {item.newTokens.toLocaleString().padStart(columns().newTokens)}
+                  </span>
+                  {"  "}
+                  {item.cached.toLocaleString().padStart(columns().cached)}
+                  {"  "}
+                  {item.total.toLocaleString().padStart(columns().total)}
                 </text>
-              </Show>
-            </box>
-          )}
-        </For>
+                <TurnTokenToolCalls tools={item.tools} />
+                <Show when={item.reuseDrop !== undefined}>
+                  <text fg={theme.text.feedback.warning.default}>
+                    ! Likely cache bust: {item.reuseDrop?.toLocaleString()} fewer cached tokens than the previous step
+                  </text>
+                </Show>
+              </box>
+            )}
+          </For>
+        </Show>
       </box>
     </Show>
   )

packages/tui/test/config-v2.test.tsx

@@ -25,6 +25,8 @@ test("validates the session tabs setting", () => {
   expect(() => decode({ tabs: { enabled: "on" } })).toThrow()
   expect(decode({ prompt: { image_preview: true } })).toEqual({ prompt: { image_preview: true } })
   expect(decode({ session: { image_preview: true } })).toEqual({ session: { image_preview: true } })
+  expect(decode({ session: { new_location: "inherit" } })).toEqual({ session: { new_location: "inherit" } })
+  expect(() => decode({ session: { new_location: "current" } })).toThrow()
 })
 
 test("resolves nested config and keybind defaults", () => {
@@ -45,6 +47,7 @@ test("resolves nested config and keybind defaults", () => {
   expect(config.diffs).toEqual({ view: "split" })
   expect(config.debug).toEqual({ devtools: true })
   expect(config.tabs).toEqual({ enabled: true, scope: "cwd", layout: "horizontal" })
+  expect(config.session.new_location).toBe("launch")
 })
 
 test("shows resolved tab defaults in settings", () => {
@@ -53,6 +56,10 @@ test("shows resolved tab defaults in settings", () => {
   expect(settings.find((setting) => setting.path.join(".") === "tabs.layout")?.default).toBe("horizontal")
 })
 
+test("shows the new session location default in settings", () => {
+  expect(settings.find((setting) => setting.path.join(".") === "session.new_location")?.default).toBe("launch")
+})
+
 test("provides config and its host interface", async () => {
   const config = resolve({}, { terminalSuspend: true })
   let current = {}

packages/tui/test/new-session-location.test.ts

@@ -0,0 +1,19 @@
+import { expect, test } from "bun:test"
+import { newSessionLocation } from "../src/config/new-session-location"
+
+test("uses the launch directory by default", () => {
+  expect(newSessionLocation("launch", "/launch", { directory: "/session", workspaceID: "work-1" })).toEqual({
+    directory: "/launch",
+  })
+})
+
+test("inherits the active session location when configured", () => {
+  expect(newSessionLocation("inherit", "/launch", { directory: "/session", workspaceID: "work-1" })).toEqual({
+    directory: "/session",
+    workspaceID: "work-1",
+  })
+})
+
+test("falls back to the launch directory without an active session", () => {
+  expect(newSessionLocation("inherit", "/launch")).toEqual({ directory: "/launch" })
+})