fix(session): use session selection for commands

packages/app/src/components/prompt-input/submit.test.ts

@@ -534,11 +534,14 @@ describe("prompt submit worktree selection", () => {
         id: expect.stringMatching(/^msg_/),
         command: "review",
         arguments: "staged changes",
-        agent: "agent",
-        model: { id: "model", providerID: "provider", variant: "high" },
         files: [],
       },
     ])
+    expect(switchedAgents).toEqual([{ sessionID: "session-1", agent: "agent" }])
+    expect(switchedModels).toEqual([
+      { sessionID: "session-1", model: { id: "model", providerID: "provider", variant: "high" } },
+    ])
+    expect(sessionRequestOrder).toEqual(["agent", "model"])
     expect(serverSessionSyncs).toBe(0)
   })
 

packages/app/src/components/prompt-input/submit.ts

@@ -61,23 +61,39 @@ export async function sendFollowupDraft(input: FollowupSendInput) {
     input.serverSync.session.set("session_status", input.draft.sessionID, { type: "idle" })
   }
 
+  const select = async () => {
+    const session = input.session()
+    if (session?.agent !== input.draft.agent) {
+      await input.api.switchAgent({ sessionID: input.draft.sessionID, agent: input.draft.agent })
+    }
+    if (
+      session?.model?.providerID === input.draft.model.providerID &&
+      session.model.id === input.draft.model.modelID &&
+      (session.model.variant ?? "default") === (input.draft.variant ?? "default")
+    )
+      return
+    await input.api.switchModel({
+      sessionID: input.draft.sessionID,
+      model: {
+        id: input.draft.model.modelID,
+        providerID: input.draft.model.providerID,
+        variant: input.draft.variant,
+      },
+    })
+  }
+
   const [head, ...tail] = text.split(" ")
   const cmd = head?.startsWith("/") ? head.slice(1) : undefined
   if (cmd && input.sync.data.command.find((item) => item.name === cmd)) {
     setBusy()
     try {
+      await select()
       const messageID = Identifier.ascending("message")
       await input.api.command({
         sessionID: input.draft.sessionID,
         id: messageID,
         command: cmd,
         arguments: tail.join(" "),
-        agent: input.draft.agent,
-        model: {
-          id: input.draft.model.modelID,
-          providerID: input.draft.model.providerID,
-          variant: input.draft.variant,
-        },
         files: await Promise.all(
           images.map(async (attachment) => ({
             uri: await blobDataUrl(attachment.blob, attachment.mime),
@@ -118,24 +134,7 @@ export async function sendFollowupDraft(input: FollowupSendInput) {
   })
 
   try {
-    const session = input.session()
-    if (session?.agent !== input.draft.agent) {
-      await input.api.switchAgent({ sessionID: input.draft.sessionID, agent: input.draft.agent })
-    }
-    if (
-      session?.model?.providerID !== input.draft.model.providerID ||
-      session.model.id !== input.draft.model.modelID ||
-      (session.model.variant ?? "default") !== (input.draft.variant ?? "default")
-    ) {
-      await input.api.switchModel({
-        sessionID: input.draft.sessionID,
-        model: {
-          id: input.draft.model.modelID,
-          providerID: input.draft.model.providerID,
-          variant: input.draft.variant,
-        },
-      })
-    }
+    await select()
 
     const admitted = await input.api.prompt({
       sessionID: input.draft.sessionID,
@@ -469,14 +468,23 @@ export function createPromptSubmit(input: PromptSubmitInput) {
           clearInput()
           const messageID = Identifier.ascending("message")
           submissionServerSync.session.set("session_status", session.id, { type: "busy" })
-          void submissionSDK.api.session
-            .command({
+          void (async () => {
+            if (session.agent !== agent)
+              await submissionSDK.api.session.switchAgent({ sessionID: session.id, agent })
+            if (
+              session.model?.providerID !== model.providerID ||
+              session.model.id !== model.modelID ||
+              (session.model.variant ?? "default") !== (variant ?? "default")
+            )
+              await submissionSDK.api.session.switchModel({
+                sessionID: session.id,
+                model: { id: model.modelID, providerID: model.providerID, variant },
+              })
+            await submissionSDK.api.session.command({
               sessionID: session.id,
               id: messageID,
               command: commandName,
               arguments: args.join(" "),
-              agent,
-              model: { id: model.modelID, providerID: model.providerID, variant },
               files: await Promise.all(
                 images.map(async (attachment) => ({
                   uri: await blobDataUrl(attachment.blob, attachment.mime),
@@ -484,14 +492,14 @@ export function createPromptSubmit(input: PromptSubmitInput) {
                 })),
               ),
             })
-            .catch((err) => {
-              submissionServerSync.session.set("session_status", session.id, { type: "idle" })
-              showToast({
-                title: language.t("prompt.toast.commandSendFailed.title"),
-                description: formatServerError(err, language.t, language.t("common.requestFailed")),
-              })
-              restoreInput()
+          })().catch((err) => {
+            submissionServerSync.session.set("session_status", session.id, { type: "idle" })
+            showToast({
+              title: language.t("prompt.toast.commandSendFailed.title"),
+              description: formatServerError(err, language.t, language.t("common.requestFailed")),
             })
+            restoreInput()
+          })
           return
         }
       }

packages/cli/test/fixture/standalone-owner.ts

@@ -14,7 +14,7 @@ await Effect.runPromise(
       const response = yield* Effect.promise(() =>
         fetch(new URL("/api/health", endpoint.url), { headers: Service.headers(endpoint) }),
       )
-      console.log(`STANDALONE_READY ${endpoint.pid} ${endpoint.url} ${response.status}`)
+      console.log(`${endpoint.pid} ${endpoint.url} ${response.status}`)
       return yield* Effect.never
     }),
   ),

packages/cli/test/standalone.test.ts

@@ -9,11 +9,8 @@ test("standalone server exits when its owner is killed", async () => {
     stdout: "pipe",
     stderr: "pipe",
   })
-  const line = await Promise.race([
-    readLine(owner.stdout, "STANDALONE_READY "),
-    Bun.sleep(10_000).then(() => undefined),
-  ])
-  const [, rawPID, url, status] = line?.split(" ") ?? []
+  const line = await Promise.race([readLine(owner.stdout), Bun.sleep(10_000).then(() => undefined)])
+  const [rawPID, url, status] = line?.split(" ") ?? []
   const pid = Number(rawPID)
 
   try {
@@ -32,7 +29,7 @@ test("standalone server exits when its owner is killed", async () => {
   }
 })
 
-async function readLine(stream: ReadableStream<Uint8Array>, prefix: string) {
+async function readLine(stream: ReadableStream<Uint8Array>) {
   const reader = stream.getReader()
   const decoder = new TextDecoder()
   const chunks: string[] = []
@@ -41,14 +38,14 @@ async function readLine(stream: ReadableStream<Uint8Array>, prefix: string) {
     if (result.done) break
     chunks.push(decoder.decode(result.value, { stream: true }))
     const output = chunks.join("")
-    const line = output.split("\n").find((line) => line.startsWith(prefix))
-    if (line) {
+    const newline = output.indexOf("\n")
+    if (newline !== -1) {
       reader.releaseLock()
-      return line
+      return output.slice(0, newline)
     }
   }
   reader.releaseLock()
-  return (chunks.join("") + decoder.decode()).split("\n").find((line) => line.startsWith(prefix))
+  return chunks.join("") + decoder.decode()
 }
 
 async function waitForExit(pid: number, attempts = 100): Promise<boolean> {

packages/client/src/effect/api/api.ts

@@ -192,8 +192,6 @@ export type Endpoint5_13Input = {
   readonly id?: SessionMessage.ID | undefined
   readonly command: string
   readonly arguments?: string | undefined
-  readonly agent?: Agent.ID | undefined
-  readonly model?: Model.Ref | undefined
   readonly files?: ReadonlyArray<PromptInput.FileAttachment> | undefined
   readonly agents?: ReadonlyArray<AgentAttachment> | undefined
   readonly skills?: ReadonlyArray<PromptInput.SkillAttachment> | undefined

packages/client/src/effect/generated/client.ts

@@ -423,8 +423,6 @@ const Endpoint5_13 = (raw: RawClient["server.session"]) => (input: Endpoint5_13I
         id: input["id"],
         command: input["command"],
         arguments: input["arguments"],
-        agent: input["agent"],
-        model: input["model"],
         files: input["files"],
         agents: input["agents"],
         skills: input["skills"],

packages/client/src/promise/generated/client.ts

@@ -627,8 +627,6 @@ export function make(options: ClientOptions) {
               id: input["id"],
               command: input["command"],
               arguments: input["arguments"],
-              agent: input["agent"],
-              model: input["model"],
               files: input["files"],
               agents: input["agents"],
               skills: input["skills"],

packages/client/src/promise/generated/types.ts

@@ -3511,8 +3511,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3534,8 +3532,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3557,8 +3553,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3576,58 +3570,10 @@ export type SessionCommandInput = {
     readonly delivery?: ("steer" | "queue") | null
     readonly resume?: boolean | null
   }["arguments"]
-  readonly agent?: {
-    readonly id?: string | null
-    readonly command: string
-    readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
-    readonly files?: ReadonlyArray<{
-      readonly uri: string
-      readonly name?: string
-      readonly description?: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly agents?: ReadonlyArray<{
-      readonly name: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly skills?: ReadonlyArray<{
-      readonly id: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly delivery?: ("steer" | "queue") | null
-    readonly resume?: boolean | null
-  }["agent"]
-  readonly model?: {
-    readonly id?: string | null
-    readonly command: string
-    readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
-    readonly files?: ReadonlyArray<{
-      readonly uri: string
-      readonly name?: string
-      readonly description?: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly agents?: ReadonlyArray<{
-      readonly name: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly skills?: ReadonlyArray<{
-      readonly id: string
-      readonly mention?: { readonly start: number; readonly end: number; readonly text: string }
-    }>
-    readonly delivery?: ("steer" | "queue") | null
-    readonly resume?: boolean | null
-  }["model"]
   readonly files?: {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3649,8 +3595,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3672,8 +3616,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3695,8 +3637,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string
@@ -3718,8 +3658,6 @@ export type SessionCommandInput = {
     readonly id?: string | null
     readonly command: string
     readonly arguments?: string | null
-    readonly agent?: string | null
-    readonly model?: { readonly id: string; readonly providerID: string; readonly variant?: string } | null
     readonly files?: ReadonlyArray<{
       readonly uri: string
       readonly name?: string

packages/core/src/session.ts

@@ -233,8 +233,6 @@ export interface Interface {
     sessionID: SessionSchema.ID
     command: string
     arguments?: string
-    agent?: Agent.ID
-    model?: Model.Ref
     files?: PromptInput.Prompt["files"]
     agents?: PromptInput.Prompt["agents"]
     skills?: PromptInput.Prompt["skills"]
@@ -621,13 +619,13 @@ const layer = Layer.effect(
         const evaluated = yield* commands.evaluate({ name: input.command, arguments: input.arguments })
 
         // TODO(v2 commands): decide whether command-level subtask/background execution belongs in v2 commands.
-        const agent = command.agent ?? input.agent
+        const agent = command.agent
         const commandAgent = yield* Effect.gen(function* () {
           if (!command.agent) return undefined
           const agents = yield* Agent.Service.pipe(Effect.provide(locations.get(session.location)))
           return yield* agents.get(Agent.ID.make(command.agent))
         })
-        const model = command.model ?? commandAgent?.model ?? input.model
+        const model = command.model ?? commandAgent?.model
         if (agent !== undefined && session.agent !== Agent.ID.make(agent))
           yield* result.switchAgent({ sessionID: input.sessionID, agent: Agent.ID.make(agent) })
         if (model !== undefined) yield* result.switchModel({ sessionID: input.sessionID, model })

packages/core/src/session/generate-node.ts

@@ -11,7 +11,6 @@ import { SessionContext } from "./context.js"
 import { SessionGenerate } from "./generate.js"
 import { SessionHistory } from "./history.js"
 import { SessionModelHeaders } from "./model-headers.js"
-import { SessionModelHttp } from "./model-http.js"
 import { SessionPromptCacheKey } from "./prompt-cache-key.js"
 import { SessionRunnerModel } from "./runner/model.js"
 import { SessionSystemPrompt } from "./system-prompt.js"
@@ -80,13 +79,6 @@ export const layer = Layer.effect(
             messages: contextEvent.messages,
             tools: hookedTools,
           }),
-          {
-            http: SessionModelHttp.middleware(hooks, {
-              sessionID: selection.session.id,
-              agent: selection.agent.id,
-              model: model.ref,
-            }),
-          },
         )
         yield* Effect.logInfo("session generation usage diagnostic", { usage: response.usage })
         return response.text

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

@@ -51,17 +51,15 @@ import { Effect, Layer, Schema, Stream } from "effect"
 import { testEffect } from "./lib/effect"
 
 const requests: LLMRequest[] = []
-let hasHttpMiddleware = false
 let instruction: string | Instructions.Unavailable = "Initial context"
 const sessionID = SessionSchema.ID.make("ses_generate_test")
 
 const model = LanguageModel.make({ id: "generate-model", provider: "test", route: OpenAIChat.route })
 const client = Layer.mock(LLMClient.Service)({
   stream: () => Stream.die(new Error("unused")),
-  generate: (request, options) =>
+  generate: (request) =>
     Effect.sync(() => {
       requests.push(request)
-      hasHttpMiddleware = typeof options?.http === "function"
       const response = LLMResponse.fromEvents([
         LLMEvent.stepStart({ index: 0 }),
         LLMEvent.textStart({ id: "generate" }),
@@ -223,7 +221,6 @@ const setup = Effect.gen(function* () {
 it.effect("generates from fresh settled Session context without durable mutation", () =>
   Effect.gen(function* () {
     requests.length = 0
-    hasHttpMiddleware = false
     instruction = "Initial context"
     const { db, bus, instructions } = yield* setup
     yield* InstructionState.prepare(db, bus, instructions, sessionID)
@@ -301,7 +298,6 @@ it.effect("generates from fresh settled Session context without durable mutation
 
     expect(result).toBe("Transient answer")
     expect(requests).toHaveLength(1)
-    expect(hasHttpMiddleware).toBe(true)
     expect(requests[0]?.model).toBe(model)
     expect(requests[0]?.system[0]?.text).toBe("Hooked system")
     expect(requests[0]?.system.map((part) => part.text)).toContain("Initial context")

packages/protocol/src/groups/session.ts

@@ -341,8 +341,6 @@ export const makeSessionGroup = <I extends HttpApiMiddleware.AnyId, S>(sessionLo
           id: SessionMessage.ID.pipe(Schema.optional),
           command: Schema.String,
           arguments: Schema.String.pipe(Schema.optional),
-          agent: Agent.ID.pipe(Schema.optional),
-          model: Model.Ref.pipe(Schema.optional),
           files: PromptInput.Prompt.fields.files,
           agents: PromptInput.Prompt.fields.agents,
           skills: PromptInput.Prompt.fields.skills,

packages/server/src/handlers/session.ts

@@ -356,8 +356,6 @@ export const SessionHandler = HttpApiBuilder.group(Api, "server.session", (handl
                 id: ctx.payload.id,
                 command: ctx.payload.command,
                 arguments: ctx.payload.arguments,
-                agent: ctx.payload.agent,
-                model: ctx.payload.model,
                 files: ctx.payload.files,
                 agents: ctx.payload.agents,
                 skills: ctx.payload.skills,

packages/session-ui/src/components/message-part.tsx

@@ -547,12 +547,6 @@ export function getToolInfo(
         title: i18n.t("ui.tool.shell"),
         subtitle: input.command,
       }
-    case "execute":
-      return {
-        icon: "console",
-        title: i18n.t("ui.tool.execute"),
-        subtitle: input.code,
-      }
     case "edit":
       return {
         icon: "code-lines",
@@ -1580,7 +1574,6 @@ PART_MAPPING["tool"] = function ToolPartDisplay(props) {
     if (typeof value === "string" && value) return value
     return taskId()
   })
-  const toolError = createMemo(() => partError(part(), i18n.t("ui.toolErrorCard.failed")))
 
   const render = createMemo(() => ToolRegistry.render(part().tool) ?? GenericTool)
   const controlledOpen = () => (props.onToolOpenChange ? (props.toolOpen ?? props.defaultOpen) : undefined)
@@ -1590,7 +1583,7 @@ PART_MAPPING["tool"] = function ToolPartDisplay(props) {
     <Show when={!hideQuestion()}>
       <div data-component="tool-part-wrapper" data-timeline-part-id={part().id}>
         <Switch>
-          <Match when={toolError()}>
+          <Match when={part().state.status === "error" && (part().state as any).error}>
             {(error) => {
               const cleaned = error().replace("Error: ", "")
               if (part().tool === "question" && cleaned.includes("dismissed this question")) {
@@ -1651,26 +1644,6 @@ PART_MAPPING["tool"] = function ToolPartDisplay(props) {
   )
 }
 
-function partError(part: ToolPart, fallback: string) {
-  if (part.state.status === "error") return part.state.error
-  if (part.tool !== "execute" || !("metadata" in part.state)) return undefined
-  const calls = part.state.metadata?.toolCalls
-  const failed =
-    part.state.metadata?.error === true ||
-    (Array.isArray(calls) &&
-      calls.some(
-        (call) =>
-          call !== null &&
-          typeof call === "object" &&
-          !Array.isArray(call) &&
-          "status" in call &&
-          call.status === "error",
-      ))
-  if (!failed) return undefined
-  if ("output" in part.state && typeof part.state.output === "string" && part.state.output) return part.state.output
-  return fallback
-}
-
 export function MessageDivider(props: { label: string }) {
   return (
     <div data-component="compaction-part">
@@ -2131,84 +2104,6 @@ ToolRegistry.register({
 
 ToolRegistry.register({ name: "subagent", render: ToolRegistry.render("task") })
 
-function ConsoleOutput(props: { copy: string; children: JSX.Element }) {
-  const i18n = useI18n()
-  const [copied, setCopied] = createSignal(false)
-
-  const copy = async () => {
-    if (!props.copy) return
-    if (!(await writeClipboard(props.copy))) return
-    setCopied(true)
-    setTimeout(() => setCopied(false), 2000)
-  }
-
-  return (
-    <div data-component="bash-output" dir="ltr">
-      <div data-slot="bash-copy">
-        <TooltipV2 value={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copy")} placement="top">
-          <IconButtonV2
-            icon={<IconV2 name={copied() ? "check" : "outline-copy"} size="small" />}
-            size="normal"
-            variant="ghost-muted"
-            onMouseDown={(event) => event.preventDefault()}
-            onClick={copy}
-            aria-label={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copy")}
-          />
-        </TooltipV2>
-      </div>
-      <div
-        data-slot="bash-scroll"
-        data-scrollable
-        tabIndex={0}
-        role="region"
-        aria-label={i18n.t("ui.scrollView.ariaLabel")}
-      >
-        <pre data-slot="bash-pre">
-          <code>{props.children}</code>
-        </pre>
-      </div>
-    </div>
-  )
-}
-
-ToolRegistry.register({
-  name: "execute",
-  render(props) {
-    const i18n = useI18n()
-    const pending = () => props.status === "pending" || props.status === "streaming" || props.status === "running"
-    const code = createMemo(() => (typeof props.input.code === "string" ? props.input.code : ""))
-    const text = createMemo(() => {
-      const output = stripAnsi(props.output ?? "").replace(/\r\n?/g, "\n")
-      return `${code()}${output ? "\n\n" + output : ""}`
-    })
-    const sawPending = pending()
-    return (
-      <BasicTool
-        {...props}
-        icon="console"
-        allowOpenWhilePending
-        trigger={(open) => (
-          <div data-slot="basic-tool-tool-info-structured">
-            <span data-slot="basic-tool-tool-indicator">
-              <Icon name="console" size="small" />
-            </span>
-            <div data-slot="basic-tool-tool-info-main">
-              <span data-slot="basic-tool-tool-title">
-                <TextShimmer text={i18n.t("ui.tool.execute")} active={pending()} />
-              </span>
-              <Show when={!open() && code()}>
-                <ShellSubmessage text={code()} animate={sawPending} />
-              </Show>
-            </div>
-          </div>
-        )}
-      >
-        <ConsoleOutput copy={text()}>{text()}</ConsoleOutput>
-      </BasicTool>
-    )
-  },
-})
-
 ToolRegistry.register({
   name: "shell",
   render(props) {
@@ -2221,6 +2116,17 @@ ToolRegistry.register({
       const out = stripAnsi(props.output || props.metadata.output || "").replace(/\r\n?/g, "\n")
       return `${command()}${out ? "\n\n" + out : ""}`
     })
+    const [copied, setCopied] = createSignal(false)
+
+    const handleCopy = async () => {
+      const content = command()
+      if (!content) return
+      if (await writeClipboard(content)) {
+        setCopied(true)
+        setTimeout(() => setCopied(false), 2000)
+      }
+    }
+
     return (
       <BasicTool
         {...props}
@@ -2239,12 +2145,36 @@ ToolRegistry.register({
           </div>
         )}
       >
-        <ConsoleOutput copy={command()}>
-          <span data-slot="bash-prompt" aria-hidden="true">
-            {"$ "}
-          </span>
-          {text()}
-        </ConsoleOutput>
+        <div data-component="bash-output" dir="ltr">
+          <div data-slot="bash-copy">
+            <TooltipV2 value={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copy")} placement="top">
+              <IconButtonV2
+                icon={<IconV2 name={copied() ? "check" : "outline-copy"} size="small" />}
+                size="normal"
+                variant="ghost-muted"
+                onMouseDown={(e) => e.preventDefault()}
+                onClick={handleCopy}
+                aria-label={copied() ? i18n.t("ui.message.copied") : i18n.t("ui.message.copy")}
+              />
+            </TooltipV2>
+          </div>
+          <div
+            data-slot="bash-scroll"
+            data-scrollable
+            tabIndex={0}
+            role="region"
+            aria-label={i18n.t("ui.scrollView.ariaLabel")}
+          >
+            <pre data-slot="bash-pre">
+              <code>
+                <span data-slot="bash-prompt" aria-hidden="true">
+                  {"$ "}
+                </span>
+                {text()}
+              </code>
+            </pre>
+          </div>
+        </div>
       </BasicTool>
     )
   },

packages/session-ui/src/components/part-default-open.test.ts

@@ -71,9 +71,8 @@ describe("partDefaultOpen", () => {
     ).toBe(true)
   })
 
-  test("applies shell defaults to console tools", () => {
+  test("preserves shell defaults", () => {
     expect(partDefaultOpen(tool("shell", {}), true, false)).toBe(true)
-    expect(partDefaultOpen(tool("execute", {}), true, false)).toBe(true)
   })
 })
 

packages/session-ui/src/components/part-default-open.ts

@@ -23,7 +23,7 @@ function deletionOnly(part: ToolPart) {
 
 export function partDefaultOpen(part: PartType, shell = false, edit = false): boolean | undefined {
   if (part.type !== "tool") return undefined
-  if (part.tool === "bash" || part.tool === "shell" || part.tool === "execute") return shell
+  if (part.tool === "bash" || part.tool === "shell") return shell
   if (part.tool === "edit" || part.tool === "write" || part.tool === "patch" || part.tool === "apply_patch") {
     if (!edit) return false
     return !deletionOnly(part)

packages/session-ui/src/components/tool-error-card.tsx

@@ -54,7 +54,6 @@ export function ToolErrorCard(props: ToolErrorCardProps) {
       websearch: "ui.tool.websearch",
       bash: "ui.tool.shell",
       shell: "ui.tool.shell",
-      execute: "ui.tool.execute",
       patch: "ui.tool.patch",
       apply_patch: "ui.tool.patch",
       question: "ui.tool.questions",

packages/tui/src/component/prompt/index.tsx

@@ -1220,15 +1220,23 @@ export function Prompt(props: PromptProps) {
     } else if (slashHead && isCommand) {
       move.startSubmit()
       const model = { providerID: selection.providerID, id: selection.modelID, variant }
+      if (session?.agent !== agent.id) await client.api.session.switchAgent({ sessionID, agent: agent.id })
       const cancelCommit = local.model.trackSessionCommit(sessionID, model)
+      if (
+        session?.model?.providerID !== model.providerID ||
+        session.model.id !== model.id ||
+        (session.model.variant ?? "default") !== (model.variant ?? "default")
+      )
+        await client.api.session.switchModel({ sessionID, model }).catch((error) => {
+          cancelCommit()
+          throw error
+        })
 
       void client.api.session
         .command({
           sessionID,
           command: slashHead.name,
           arguments: slashHead.arguments,
-          agent: agent.id,
-          model,
           files: store.prompt.files,
           agents: store.prompt.agents,
           skills: store.prompt.skills?.length ? store.prompt.skills : undefined,

packages/tui/src/mini/stream-v2.transport.ts

@@ -1647,8 +1647,6 @@ export async function createSessionTransport(input: StreamInput): Promise<Sessio
       )
     }
 
-    const selected = await resolveSelectedModel(input, client, next)
-    if (next.variant && !selected) throw new Error("Cannot select a variant before selecting a model")
     input.trace?.write("send.command", { sessionID: input.sessionID, messageID, command: command.name, delivery })
     return client.session.command(
       {
@@ -1656,8 +1654,6 @@ export async function createSessionTransport(input: StreamInput): Promise<Sessio
         id: messageID,
         command: command.name,
         arguments: command.arguments,
-        agent: next.agent,
-        model: selected,
         files: attachments.files.length ? attachments.files : undefined,
         agents: agents.length ? agents : undefined,
         skills: skills.length ? skills : undefined,
@@ -1700,12 +1696,10 @@ export async function createSessionTransport(input: StreamInput): Promise<Sessio
       const client = sdk
       if (next.agent)
         await client.session.switchAgent({ sessionID: input.sessionID, agent: next.agent }, { signal: next.signal })
-      if (!next.prompt.command) {
-        const selected = await resolveSelectedModel(input, client, next)
-        if (next.variant && !selected) throw new Error("Cannot select a variant before selecting a model")
-        if (selected)
-          await client.session.switchModel({ sessionID: input.sessionID, model: selected }, { signal: next.signal })
-      }
+      const selected = await resolveSelectedModel(input, client, next)
+      if (next.variant && !selected) throw new Error("Cannot select a variant before selecting a model")
+      if (selected)
+        await client.session.switchModel({ sessionID: input.sessionID, model: selected }, { signal: next.signal })
       mergePending(await admitPrompt(next, client, delivery))
       settlementClient = client
     },
@@ -1744,6 +1738,12 @@ export async function createSessionTransport(input: StreamInput): Promise<Sessio
         return
       }
       if (command) {
+        if (next.agent)
+          await client.session.switchAgent({ sessionID: input.sessionID, agent: next.agent }, { signal: next.signal })
+        const selected = await resolveSelectedModel(input, client, next)
+        if (next.variant && !selected) throw new Error("Cannot select a variant before selecting a model")
+        if (selected)
+          await client.session.switchModel({ sessionID: input.sessionID, model: selected }, { signal: next.signal })
         await runTurnWait(
           next,
           messageID,

packages/tui/test/mini/stream-v2.transport.test.ts

@@ -2855,8 +2855,6 @@ describe("V2 mini transport", () => {
       id: "msg_cmd",
       command: "deploy",
       arguments: "prod",
-      agent: "build",
-      model: { providerID: "test", id: "model" },
       files: [
         { uri: "file:///tmp/context.txt", name: "context.txt" },
         {
@@ -2868,9 +2866,11 @@ describe("V2 mini transport", () => {
       skills: [{ id: "api-design", mention: { start: 13, end: 24, text: "/api-design" } }],
       delivery: "steer",
     })
-    // Selection rides the command payload; no separate client-side switch.
-    expect(client.session.switchAgent).not.toHaveBeenCalled()
-    expect(client.session.switchModel).not.toHaveBeenCalled()
+    expect(client.session.switchAgent).toHaveBeenCalledWith({ sessionID: "ses_1", agent: "build" }, expect.anything())
+    expect(client.session.switchModel).toHaveBeenCalledWith(
+      { sessionID: "ses_1", model: { providerID: "test", id: "model" } },
+      expect.anything(),
+    )
     await transport.close()
   })
 

packages/ui/src/i18n/en.ts

@@ -158,7 +158,6 @@ const source = {
   "ui.tool.websearch": "Web Search",
   "ui.tool.websearch.provider": "{{provider}} Web Search",
   "ui.tool.shell": "Shell",
-  "ui.tool.execute": "Execute",
   "ui.tool.patch": "Patch",
   "ui.tool.questions": "Questions",
   "ui.tool.questions.numbered": "Questions {{number}}",