run: replay session history on interactive resume (#26880)

packages/opencode/src/cli/cmd/run.ts

@@ -218,6 +218,15 @@ export const RunCommand = effectCmd({
         type: "boolean",
         describe: "show thinking blocks",
       })
+      .option("replay", {
+        type: "boolean",
+        default: false,
+        describe: "replay visible session history on interactive resume",
+      })
+      .option("replay-limit", {
+        type: "number",
+        describe: "cap visible interactive replay to the newest N messages",
+      })
       .option("interactive", {
         alias: ["i"],
         type: "boolean",
@@ -269,6 +278,21 @@ export const RunCommand = effectCmd({
         die("--interactive cannot be used with --format json")
       }
 
+      if (args.replay && !args.interactive) {
+        die("--replay requires --interactive")
+      }
+
+      if (args["replay-limit"] !== undefined && !args.interactive) {
+        die("--replay-limit requires --interactive")
+      }
+
+      if (
+        args["replay-limit"] !== undefined &&
+        (!Number.isInteger(args["replay-limit"]) || args["replay-limit"] <= 0)
+      ) {
+        die("--replay-limit must be a positive integer")
+      }
+
       if (args.interactive && !process.stdout.isTTY) {
         die("--interactive requires a TTY stdout")
       }
@@ -281,6 +305,8 @@ export const RunCommand = effectCmd({
         }
       }
 
+      const replay = args.replay || args["replay-limit"] !== undefined
+
       const root = Filesystem.resolve(process.env.PWD ?? process.cwd())
       const directory = (() => {
         if (!args.dir) return args.attach ? undefined : root
@@ -786,6 +812,8 @@ export const RunCommand = effectCmd({
             sessionID,
             sessionTitle: sess.title,
             resume: Boolean(args.session || args.continue) && !args.fork,
+            replay,
+            replayLimit: args["replay-limit"],
             agent,
             model,
             variant: args.variant,
@@ -821,6 +849,8 @@ export const RunCommand = effectCmd({
             agent: args.agent,
             model,
             variant: args.variant,
+            replay,
+            replayLimit: args["replay-limit"],
             files,
             initialInput,
             thinking,

packages/opencode/src/cli/cmd/run/runtime.ts

@@ -51,6 +51,8 @@ type RunRuntimeInput = {
   files: RunInput["files"]
   initialInput?: string
   thinking: boolean
+  replay?: boolean
+  replayLimit?: number
   demo?: RunInput["demo"]
 }
 
@@ -67,6 +69,8 @@ type RunLocalInput = {
   files: RunInput["files"]
   initialInput?: string
   thinking: boolean
+  replay?: boolean
+  replayLimit?: number
   demo?: RunInput["demo"]
 }
 
@@ -490,6 +494,8 @@ async function runInteractiveRuntime(input: RunRuntimeInput): Promise<void> {
             directory: ctx.directory,
             sessionID: state.sessionID,
             thinking: input.thinking,
+            replay: input.replay,
+            replayLimit: input.replayLimit,
             limits: () => state.limits,
             footer,
             trace: log,
@@ -722,6 +728,8 @@ export async function runInteractiveLocalMode(input: RunLocalInput): Promise<voi
         files: input.files,
         initialInput: input.initialInput,
         thinking: input.thinking,
+        replay: input.replay,
+        replayLimit: input.replayLimit,
         demo: input.demo,
         resolveSession: () => {
           if (session) {
@@ -774,6 +782,8 @@ export async function runInteractiveMode(input: RunInput & { createSession?: Cre
         files: input.files,
         initialInput: input.initialInput,
         thinking: input.thinking,
+        replay: input.replay,
+        replayLimit: input.replayLimit,
         demo: input.demo,
         boot: async () => ({
           sdk: input.sdk,

packages/opencode/src/cli/cmd/run/session-replay.ts

@@ -0,0 +1,188 @@
+import type { Event, PermissionRequest, QuestionRequest } from "@opencode-ai/sdk/v2"
+import { bootstrapSessionData, createSessionData, reduceSessionData, type SessionData } from "./session-data"
+import { messagePrompt, type SessionMessages } from "./session.shared"
+import type { FooterPatch, StreamCommit } from "./types"
+
+type ReplayInput = {
+  messages: SessionMessages
+  permissions: PermissionRequest[]
+  questions: QuestionRequest[]
+  thinking: boolean
+  limits: Record<string, number>
+}
+
+export type SessionReplay = {
+  data: SessionData
+  commits: StreamCommit[]
+  patch?: FooterPatch
+}
+
+type ReplayMessage = {
+  commits: StreamCommit[]
+  patch?: FooterPatch
+}
+
+function apply(data: SessionData, event: Event, sessionID: string, thinking: boolean, limits: Record<string, number>) {
+  return reduceSessionData({
+    data,
+    event,
+    sessionID,
+    thinking,
+    limits,
+  })
+}
+
+function mergePatch(left: FooterPatch | undefined, right: FooterPatch | undefined) {
+  if (!left) {
+    return right
+  }
+
+  if (!right) {
+    return left
+  }
+
+  return {
+    ...left,
+    ...right,
+  }
+}
+
+function active(data: SessionData) {
+  return data.part.size > 0 || data.tools.size > 0
+}
+
+function replayPatch(data: SessionData, patch: FooterPatch | undefined) {
+  if (active(data)) {
+    if (!patch) {
+      return {
+        phase: "running",
+      } satisfies FooterPatch
+    }
+
+    return {
+      ...patch,
+      phase: "running",
+    } satisfies FooterPatch
+  }
+
+  if (data.permissions.length > 0 || data.questions.length > 0) {
+    if (!patch) {
+      return {
+        phase: "idle",
+      } satisfies FooterPatch
+    }
+
+    return {
+      ...patch,
+      phase: "idle",
+    } satisfies FooterPatch
+  }
+
+  if (!patch) {
+    return undefined
+  }
+
+  return {
+    ...patch,
+    phase: "idle",
+    status: "",
+  } satisfies FooterPatch
+}
+
+function replayMessage(
+  data: SessionData,
+  message: SessionMessages[number],
+  thinking: boolean,
+  limits: Record<string, number>,
+): ReplayMessage {
+  if (message.info.role === "user") {
+    const prompt = messagePrompt(message)
+    if (!prompt.text.trim()) {
+      return {
+        commits: [],
+      }
+    }
+
+    return {
+      commits: [
+        {
+          kind: "user",
+          text: prompt.text,
+          phase: "start",
+          source: "system",
+          messageID: message.info.id,
+        },
+      ],
+    }
+  }
+
+  const commits: StreamCommit[] = []
+  let patch: FooterPatch | undefined
+
+  const info = apply(
+    data,
+    {
+      id: `bootstrap:message:${message.info.id}`,
+      type: "message.updated",
+      properties: {
+        sessionID: message.info.sessionID,
+        info: message.info,
+      },
+    },
+    message.info.sessionID,
+    thinking,
+    limits,
+  )
+  commits.push(...info.commits)
+  patch = mergePatch(patch, info.footer?.patch)
+
+  for (const part of message.parts) {
+    const next = apply(
+      data,
+      {
+        id: `bootstrap:part:${part.id}`,
+        type: "message.part.updated",
+        properties: {
+          sessionID: part.sessionID,
+          part,
+          time: 0,
+        },
+      },
+      message.info.sessionID,
+      thinking,
+      limits,
+    )
+    patch = mergePatch(patch, next.footer?.patch)
+    commits.push(...next.commits)
+  }
+
+  return {
+    commits,
+    patch,
+  }
+}
+
+export function replaySession(input: ReplayInput): SessionReplay {
+  const data = createSessionData()
+  const commits: StreamCommit[] = []
+  let patch: FooterPatch | undefined
+
+  bootstrapSessionData({
+    data,
+    messages: input.messages,
+    permissions: input.permissions,
+    questions: input.questions,
+  })
+
+  for (const message of input.messages) {
+    const next = replayMessage(data, message, input.thinking, input.limits)
+    commits.push(...next.commits)
+    patch = mergePatch(patch, next.patch)
+  }
+
+  return {
+    data,
+    commits,
+    patch: replayPatch(data, patch),
+  }
+}

packages/opencode/src/cli/cmd/run/session.shared.ts

@@ -60,7 +60,7 @@ function fileSource(
   }
 }
 
-function prompt(msg: SessionMessages[number]): RunPrompt {
+export function messagePrompt(msg: SessionMessages[number]): RunPrompt {
   const parts: RunPrompt["parts"] = []
   let text = msg.parts
     .filter((part): part is Extract<SessionMessages[number]["parts"][number], { type: "text" }> => {
@@ -135,7 +135,7 @@ function turn(msg: SessionMessages[number]): Turn | undefined {
   }
 
   return {
-    prompt: prompt(msg),
+    prompt: messagePrompt(msg),
     provider: msg.info.model.providerID,
     model: msg.info.model.modelID,
     variant: msg.info.model.variant,

packages/opencode/src/cli/cmd/run/stream.transport.ts

@@ -27,6 +27,7 @@ import {
   reduceSessionData,
   type SessionData,
 } from "./session-data"
+import { replaySession } from "./session-replay"
 import {
   bootstrapSubagentCalls,
   bootstrapSubagentData,
@@ -66,6 +67,8 @@ type StreamInput = {
   directory?: string
   sessionID: string
   thinking: boolean
+  replay?: boolean
+  replayLimit?: number
   limits: () => Record<string, number>
   footer: FooterApi
   trace?: Trace
@@ -432,7 +435,12 @@ function createLayer(input: StreamInput) {
           blockerTick: 0,
           blockers: new Map(),
         }
+        let booting = true
+        const buffered: Event[] = []
+        const replayedParts = new Set<string>()
         const recovering = new Set<string>()
+        const tracked = (sessionID: string | undefined) =>
+          sessionID === input.sessionID || (!!sessionID && state.subagent.tabs.has(sessionID))
         const currentSubagentState = () => {
           if (state.selectedSubagent && !state.subagent.tabs.has(state.selectedSubagent)) {
             state.selectedSubagent = undefined
@@ -550,11 +558,11 @@ function createLayer(input: StreamInput) {
           }
         })
 
-        const messages = (sessionID: string, limit: number) =>
+        const messages = (sessionID: string, limit?: number) =>
           Effect.promise(() =>
             input.sdk.session.messages({
               sessionID,
-              limit,
+              ...(typeof limit === "number" ? { limit } : {}),
             }),
           ).pipe(
             Effect.map((item) => item.data ?? []),
@@ -596,7 +604,14 @@ function createLayer(input: StreamInput) {
         const bootstrap = Effect.fn("RunStreamTransport.bootstrap")(function* () {
           const [messagesList, children, permissions, questions] = yield* Effect.all(
             [
-              messages(input.sessionID, SUBAGENT_BOOTSTRAP_LIMIT),
+              messages(
+                input.sessionID,
+                input.replay
+                  ? (input.replayLimit === undefined
+                      ? undefined
+                      : Math.max(input.replayLimit, SUBAGENT_BOOTSTRAP_LIMIT))
+                  : SUBAGENT_BOOTSTRAP_LIMIT,
+              ),
               Effect.promise(() =>
                 input.sdk.session.children({
                   sessionID: input.sessionID,
@@ -619,12 +634,51 @@ function createLayer(input: StreamInput) {
             },
           )
 
-          bootstrapSessionData({
-            data: state.data,
-            messages: messagesList,
-            permissions: permissions.filter((item) => item.sessionID === input.sessionID),
-            questions: questions.filter((item) => item.sessionID === input.sessionID),
-          })
+          const sessionPermissions = permissions.filter((item) => item.sessionID === input.sessionID)
+          const sessionQuestions = questions.filter((item) => item.sessionID === input.sessionID)
+          const history = input.replay
+            ? replaySession({
+                messages: messagesList,
+                permissions: sessionPermissions,
+                questions: sessionQuestions,
+                thinking: input.thinking,
+                limits: input.limits(),
+              })
+            : undefined
+          const replay = history && input.replayLimit !== undefined && messagesList.length > input.replayLimit
+            ? replaySession({
+                messages: messagesList.slice(-input.replayLimit),
+                permissions: sessionPermissions,
+                questions: sessionQuestions,
+                thinking: input.thinking,
+                limits: input.limits(),
+              })
+            : history
+
+          replayedParts.clear()
+          if (history) {
+            state.data = history.data
+          }
+
+          if (!history) {
+            bootstrapSessionData({
+              data: state.data,
+              messages: messagesList,
+              permissions: sessionPermissions,
+              questions: sessionQuestions,
+            })
+          }
+
+          if (replay) {
+            for (const [partID] of replay.data.text) {
+              if (!replay.data.part.has(partID)) {
+                continue
+              }
+
+              replayedParts.add(partID)
+            }
+          }
+
           bootstrapSubagentData({
             data: state.subagent,
             messages: messagesList,
@@ -632,6 +686,7 @@ function createLayer(input: StreamInput) {
             permissions,
             questions,
           })
+          clearFinishedSubagents(state.subagent)
 
           for (const request of [
             ...state.data.permissions,
@@ -642,9 +697,29 @@ function createLayer(input: StreamInput) {
             seedBlocker(request.id)
           }
 
+          if (replay) {
+            const activeCommitIDs = new Set([...state.data.part.keys(), ...state.data.tools])
+            for (const commit of replay.commits) {
+              input.trace?.write("ui.commit", commit)
+              input.footer.append(commit)
+
+              if (commit.partID && activeCommitIDs.has(commit.partID)) {
+                continue
+              }
+
+              yield* Effect.promise(() => input.footer.idle()).pipe(Effect.orElseSucceed(() => undefined))
+            }
+          }
+
           const snapshot = currentSubagentState()
           traceTabs(input.trace, [], snapshot.tabs)
-          syncFooter([], undefined, snapshot)
+          syncFooter([], replay?.patch, snapshot)
+          if (replay) {
+            yield* Effect.promise(() => input.footer.idle()).pipe(Effect.orElseSucceed(() => undefined))
+          }
+
+          booting = false
+          yield* drainBuffered()
 
           const sessions = [...state.subagent.tabs.keys()]
           if (sessions.length === 0) {
@@ -738,6 +813,86 @@ function createLayer(input: StreamInput) {
           })
         }
 
+        const applyEvent = Effect.fn("RunStreamTransport.applyEvent")(function* (event: Event) {
+          if (event.type === "message.part.delta" && event.properties.sessionID === input.sessionID) {
+            if (replayedParts.has(event.properties.partID)) {
+              const seen = state.data.text.get(event.properties.partID) ?? ""
+              if (seen.endsWith(event.properties.delta)) {
+                return
+              }
+
+              replayedParts.delete(event.properties.partID)
+            }
+          }
+
+          trackBlocker(event)
+
+          const prev = event.type === "message.part.updated" ? listSubagentTabs(state.subagent) : undefined
+          const next = reduceSessionData({
+            data: state.data,
+            event,
+            sessionID: input.sessionID,
+            thinking: input.thinking,
+            limits: input.limits(),
+          })
+          state.data = next.data
+
+          if (
+            event.type === "message.part.updated" &&
+            event.properties.part.sessionID === input.sessionID &&
+            event.properties.part.type === "tool" &&
+            event.properties.part.tool === "question" &&
+            event.properties.part.state.status === "running" &&
+            state.data.questions.length === 0
+          ) {
+            yield* recoverQuestion(event.properties.part.id).pipe(
+              Effect.forkIn(scope, { startImmediately: true }),
+              Effect.asVoid,
+            )
+          }
+
+          const changed = reduceSubagentData({
+            data: state.subagent,
+            event,
+            sessionID: input.sessionID,
+            thinking: input.thinking,
+            limits: input.limits(),
+          })
+          if (changed && prev) {
+            traceTabs(input.trace, prev, listSubagentTabs(state.subagent))
+          }
+          releaseBlocker(event)
+
+          syncFooter(next.commits, next.footer?.patch, changed ? currentSubagentState() : undefined)
+
+          touch(event)
+          yield* mark(event)
+        })
+
+        const drainBuffered = Effect.fn("RunStreamTransport.drainBuffered")(function* () {
+          let pending = buffered.splice(0)
+          while (pending.length > 0) {
+            const next: Event[] = []
+            let changed = false
+            for (const event of pending) {
+              if (!tracked(sid(event))) {
+                next.push(event)
+                continue
+              }
+
+              changed = true
+              yield* applyEvent(event)
+            }
+
+            if (!changed) {
+              buffered.push(...next)
+              return
+            }
+
+            pending = next
+          }
+        })
+
         const watch = Effect.fn("RunStreamTransport.watch")(() =>
           Stream.fromAsyncIterable(events.stream, (error) =>
             error instanceof Error ? error : new Error(String(error)),
@@ -762,53 +917,25 @@ function createLayer(input: StreamInput) {
                 }
 
                 const sessionID = sid(event)
-                if (sessionID !== input.sessionID && (!sessionID || !state.subagent.tabs.has(sessionID))) {
+                if (booting) {
+                  if (sessionID) {
+                    input.trace?.write("recv.event", event)
+                    buffered.push(event)
+                  }
                   return
                 }
 
-                input.trace?.write("recv.event", event)
-                trackBlocker(event)
-
-                const prev = event.type === "message.part.updated" ? listSubagentTabs(state.subagent) : undefined
-                const next = reduceSessionData({
-                  data: state.data,
-                  event,
-                  sessionID: input.sessionID,
-                  thinking: input.thinking,
-                  limits: input.limits(),
-                })
-                state.data = next.data
-
-                if (
-                  event.type === "message.part.updated" &&
-                  event.properties.part.sessionID === input.sessionID &&
-                  event.properties.part.type === "tool" &&
-                  event.properties.part.tool === "question" &&
-                  event.properties.part.state.status === "running" &&
-                  state.data.questions.length === 0
-                ) {
-                  yield* recoverQuestion(event.properties.part.id).pipe(
-                    Effect.forkIn(scope, { startImmediately: true }),
-                    Effect.asVoid,
-                  )
-                }
-
-                const changed = reduceSubagentData({
-                  data: state.subagent,
-                  event,
-                  sessionID: input.sessionID,
-                  thinking: input.thinking,
-                  limits: input.limits(),
-                })
-                if (changed && prev) {
-                  traceTabs(input.trace, prev, listSubagentTabs(state.subagent))
+                if (!tracked(sessionID)) {
+                  if (sessionID) {
+                    input.trace?.write("recv.event", event)
+                    buffered.push(event)
+                  }
+                  return
                 }
-                releaseBlocker(event)
 
-                syncFooter(next.commits, next.footer?.patch, changed ? currentSubagentState() : undefined)
-
-                touch(event)
-                yield* mark(event)
+                input.trace?.write("recv.event", event)
+                yield* applyEvent(event)
+                yield* drainBuffered()
               }),
             ),
             Effect.catch((error) => (abort.signal.aborted ? Effect.void : fail(error))),
@@ -823,8 +950,8 @@ function createLayer(input: StreamInput) {
           ),
         )
 
-        yield* bootstrap()
         yield* Scope.provide(scope)(watch().pipe(Effect.forkScoped))
+        yield* bootstrap()
 
         const runPromptTurn = Effect.fn("RunStreamTransport.runPromptTurn")(function* (next: SessionTurnInput) {
           if (closed || next.signal?.aborted || input.footer.isClosed) {

packages/opencode/src/cli/cmd/run/subagent-data.ts

@@ -420,9 +420,26 @@ function ensureBlockerTab(
   title: string | undefined,
   kind: "permission" | "question",
 ) {
-  if (data.tabs.has(sessionID)) {
+  const current = data.tabs.get(sessionID)
+  if (current) {
     ensureDetail(data, sessionID)
-    return false
+    if (current.status !== "running") {
+      return false
+    }
+
+    const next = {
+      ...current,
+      description: kind === "permission" ? "Pending permission" : "Pending question",
+      status: "running" as const,
+      title: current.title ?? title,
+      lastUpdatedAt: Date.now(),
+    }
+    if (sameSubagentTab(current, next)) {
+      return false
+    }
+
+    data.tabs.set(sessionID, next)
+    return true
   }
 
   data.tabs.set(sessionID, {

packages/opencode/src/cli/cmd/run/types.ts

@@ -52,6 +52,8 @@ export type RunInput = {
   sessionID: string
   sessionTitle?: string
   resume?: boolean
+  replay?: boolean
+  replayLimit?: number
   agent: string | undefined
   model: PromptModel | undefined
   variant: string | undefined

packages/opencode/test/cli/run/scrollback.surface.test.ts

@@ -96,6 +96,17 @@ function assistant(text: string, phase: StreamCommit["phase"] = "progress"): Str
   }
 }
 
+function reasoning(text: string, phase: StreamCommit["phase"] = "progress"): StreamCommit {
+  return {
+    kind: "reasoning",
+    text,
+    phase,
+    source: "reasoning",
+    messageID: "msg-r-1",
+    partID: "part-r-1",
+  }
+}
+
 function user(text: string): StreamCommit {
   return {
     kind: "user",
@@ -392,6 +403,39 @@ test("inserts spacers for new visible groups", async () => {
   }
 })
 
+test("renders replayed user, reasoning, and assistant output after completion", async () => {
+  const out = await setup()
+
+  try {
+    const lines: string[] = []
+    const take = () => {
+      const commits = claim(out.renderer)
+      try {
+        lines.push(...commits.flatMap((commit) => renderRows(commit).flatMap((row) => row.split("\n"))))
+      } finally {
+        destroy(commits)
+      }
+    }
+
+    await out.scrollback.append(user("Hello you"))
+    take()
+    await out.scrollback.append(reasoning("Thinking: **Plan**\n\nSay hello.", "progress"))
+    await out.scrollback.complete()
+    take()
+    await out.scrollback.append(assistant("Hello.", "progress"))
+    await out.scrollback.complete()
+    take()
+
+    const output = lines.join("\n")
+    expect(output).toContain("› Hello you")
+    expect(output).toContain("Thinking:")
+    expect(output).toContain("Plan")
+    expect(output).toContain("Hello.")
+  } finally {
+    out.scrollback.destroy()
+  }
+})
+
 test("coalesces same-line tool progress into one snapshot", async () => {
   const out = await setup()
 

packages/opencode/test/cli/run/session-replay.test.ts

@@ -0,0 +1,156 @@
+import { describe, expect, test } from "bun:test"
+import { replaySession } from "@/cli/cmd/run/session-replay"
+import type { SessionMessages } from "@/cli/cmd/run/session.shared"
+
+function userMessage(id: string, text: string): SessionMessages[number] {
+  return {
+    info: {
+      id,
+      sessionID: "session-1",
+      role: "user",
+      time: {
+        created: 1,
+      },
+      agent: "build",
+      model: {
+        providerID: "openai",
+        modelID: "gpt-5",
+      },
+    },
+    parts: [
+      {
+        id: `${id}-text`,
+        sessionID: "session-1",
+        messageID: id,
+        type: "text",
+        text,
+      },
+    ],
+  }
+}
+
+function assistantInfo(id: string) {
+  return {
+    id,
+    sessionID: "session-1",
+    role: "assistant" as const,
+    time: {
+      created: 2,
+    },
+    parentID: "msg-user-1",
+    modelID: "gpt-5",
+    providerID: "openai",
+    mode: "chat",
+    agent: "build",
+    path: {
+      cwd: "/tmp",
+      root: "/tmp",
+    },
+    cost: 0,
+    tokens: {
+      input: 1,
+      output: 1,
+      reasoning: 0,
+      cache: {
+        read: 0,
+        write: 0,
+      },
+    },
+  }
+}
+
+function assistantMessage(id: string, text: string): SessionMessages[number] {
+  return {
+    info: assistantInfo(id),
+    parts: [
+      {
+        id: `${id}-text`,
+        sessionID: "session-1",
+        messageID: id,
+        type: "text",
+        text,
+        time: {
+          start: 2,
+          end: 3,
+        },
+      },
+    ],
+  }
+}
+
+function runningToolMessage(id: string): SessionMessages[number] {
+  return {
+    info: assistantInfo(id),
+    parts: [
+      {
+        id: `${id}-tool`,
+        sessionID: "session-1",
+        messageID: id,
+        type: "tool",
+        callID: `${id}-call`,
+        tool: "bash",
+        state: {
+          status: "running",
+          input: {
+            command: "pwd",
+          },
+          time: {
+            start: 2,
+          },
+        },
+      },
+    ],
+  }
+}
+
+describe("run session replay", () => {
+  test("replays persisted user and assistant history into scrollback commits", () => {
+    const out = replaySession({
+      messages: [userMessage("msg-user-1", "Hello, whats the weather today?"), assistantMessage("msg-1", "What city or ZIP code should I check?")],
+      permissions: [],
+      questions: [],
+      thinking: true,
+      limits: {},
+    })
+
+    expect(out.commits).toEqual([
+      expect.objectContaining({
+        kind: "user",
+        text: "Hello, whats the weather today?",
+        phase: "start",
+        source: "system",
+        messageID: "msg-user-1",
+      }),
+      expect.objectContaining({
+        kind: "assistant",
+        text: "What city or ZIP code should I check?",
+        phase: "progress",
+        source: "assistant",
+        messageID: "msg-1",
+      }),
+    ])
+    expect(out.patch).toEqual(
+      expect.objectContaining({
+        phase: "idle",
+        status: "",
+      }),
+    )
+  })
+
+  test("keeps the footer in a running state for resumed active tools", () => {
+    const out = replaySession({
+      messages: [runningToolMessage("msg-1")],
+      permissions: [],
+      questions: [],
+      thinking: true,
+      limits: {},
+    })
+
+    expect(out.patch).toEqual(
+      expect.objectContaining({
+        phase: "running",
+        status: "running bash",
+      }),
+    )
+  })
+})

packages/opencode/test/cli/run/stream.transport.test.ts

@@ -67,6 +67,22 @@ function idle(sessionID = "session-1") {
   } satisfies SdkEvent
 }
 
+function retry(sessionID: string, attempt: number, message: string) {
+  return {
+    id: `evt-${sessionID}-retry-${attempt}`,
+    type: "session.status",
+    properties: {
+      sessionID,
+      status: {
+        type: "retry",
+        attempt,
+        message,
+        next: 1,
+      },
+    },
+  } satisfies SdkEvent
+}
+
 function assistant(id: string) {
   return {
     id: `evt-${id}`,
@@ -290,12 +306,12 @@ function toolUpdated(part: SessionToolPart): SdkEvent {
   }
 }
 
-function textDelta(messageID: string, partID: string, delta: string): SdkEvent {
+function textDelta(messageID: string, partID: string, delta: string, sessionID = "session-1"): SdkEvent {
   return {
     id: `evt-${partID}-delta`,
     type: "message.part.delta",
     properties: {
-      sessionID: "session-1",
+      sessionID,
       messageID,
       partID,
       field: "text",
@@ -331,6 +347,7 @@ function footer(fn?: (commit: StreamCommit) => void) {
   const commits: StreamCommit[] = []
   const events: FooterEvent[] = []
   let closed = false
+  let idleCalls = 0
 
   const api: FooterApi = {
     get isClosed() {
@@ -346,6 +363,7 @@ function footer(fn?: (commit: StreamCommit) => void) {
       fn?.(next)
     },
     idle() {
+      idleCalls += 1
       return Promise.resolve()
     },
     close() {
@@ -356,7 +374,7 @@ function footer(fn?: (commit: StreamCommit) => void) {
     },
   }
 
-  return { api, commits, events }
+  return { api, commits, events, get idleCalls() { return idleCalls } }
 }
 
 function sdk(
@@ -398,6 +416,355 @@ function sdk(
 }
 
 describe("run stream transport", () => {
+  test("does not replay persisted main-session history during bootstrap by default", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const transport = await createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) =>
+          sessionID === "session-1"
+            ? ok([
+                assistantMessage({
+                  sessionID: "session-1",
+                  id: "msg-1",
+                  parts: [
+                    {
+                      ...textPart("text-1", "msg-1", "Hello."),
+                      time: {
+                        start: 1,
+                        end: 2,
+                      },
+                    },
+                  ],
+                }),
+              ])
+            : ok([]),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      expect(ui.commits).toEqual([])
+      expect(ui.idleCalls).toBe(0)
+    } finally {
+      src.close()
+      await transport.close()
+    }
+  })
+
+  test("replays persisted main-session history during bootstrap when enabled", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const transport = await createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) =>
+          sessionID === "session-1"
+            ? ok([
+                assistantMessage({
+                  sessionID: "session-1",
+                  id: "msg-1",
+                  parts: [
+                    {
+                      ...textPart("text-1", "msg-1", "Hello."),
+                      time: {
+                        start: 1,
+                        end: 2,
+                      },
+                    },
+                  ],
+                }),
+              ])
+            : ok([]),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      replay: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      await waitFor(() => ui.commits.find((item) => item.kind === "assistant" && item.text === "Hello."))
+      expect(ui.idleCalls).toBeGreaterThan(0)
+    } finally {
+      src.close()
+      await transport.close()
+    }
+  })
+
+  test("caps replayed bootstrap history to the configured number of messages", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const transport = await createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) =>
+          ok(
+            sessionID === "session-1"
+              ? [
+                  assistantMessage({
+                    sessionID: "session-1",
+                    id: "msg-1",
+                    parts: [
+                      {
+                        ...textPart("text-1", "msg-1", "Hello."),
+                        time: {
+                          start: 1,
+                          end: 2,
+                        },
+                      },
+                    ],
+                  }),
+                  assistantMessage({
+                    sessionID: "session-1",
+                    id: "msg-2",
+                    parts: [
+                      {
+                        ...textPart("text-2", "msg-2", "World."),
+                        time: {
+                          start: 3,
+                          end: 4,
+                        },
+                      },
+                    ],
+                  }),
+                ]
+              : [],
+          ),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      replay: true,
+      replayLimit: 1,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      await waitFor(() => (ui.commits.length > 0 ? ui.commits : undefined))
+      expect(ui.commits.filter((item) => item.kind === "assistant")).toEqual([
+        expect.objectContaining({
+          text: "World.",
+        }),
+      ])
+    } finally {
+      src.close()
+      await transport.close()
+    }
+  })
+
+  test("skips buffered pre-bootstrap deltas already covered by replay history", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const gate = defer<void>()
+    let transport: Awaited<ReturnType<typeof createSessionTransport>> | undefined
+    const task = createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) => {
+          if (sessionID !== "session-1") {
+            return ok([])
+          }
+
+          await gate.promise
+          return ok([
+            assistantMessage({
+              sessionID: "session-1",
+              id: "msg-1",
+              parts: [textPart("text-1", "msg-1", "Hello")],
+            }),
+          ])
+        },
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      replay: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      await Promise.resolve()
+      src.push(textDelta("msg-1", "text-1", "lo"))
+      gate.resolve()
+      transport = await task
+
+      await waitFor(() => (ui.commits.length > 0 ? ui.commits : undefined))
+      await Bun.sleep(20)
+      expect(ui.commits.filter((item) => item.kind === "assistant")).toEqual([
+        expect.objectContaining({
+          text: "Hello",
+        }),
+      ])
+    } finally {
+      src.close()
+      await transport?.close()
+    }
+  })
+
+  test("applies buffered pre-bootstrap deltas not yet persisted", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const gate = defer<void>()
+    let transport: Awaited<ReturnType<typeof createSessionTransport>> | undefined
+    const task = createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) => {
+          if (sessionID !== "session-1") {
+            return ok([])
+          }
+
+          await gate.promise
+          return ok([
+            assistantMessage({
+              sessionID: "session-1",
+              id: "msg-1",
+              parts: [textPart("text-1", "msg-1", "")],
+            }),
+          ])
+        },
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      replay: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      await Promise.resolve()
+      src.push(textDelta("msg-1", "text-1", "Hello"))
+      gate.resolve()
+      transport = await task
+
+      await waitFor(() => (ui.commits.length > 0 ? ui.commits : undefined))
+      await Bun.sleep(20)
+      expect(ui.commits.filter((item) => item.kind === "assistant")).toEqual([
+        expect.objectContaining({
+          text: "Hello",
+        }),
+      ])
+    } finally {
+      src.close()
+      await transport?.close()
+    }
+  })
+
+  test("preserves running footer state for resumed active sessions", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const transport = await createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) =>
+          sessionID === "session-1"
+            ? ok([
+                assistantMessage({
+                  sessionID: "session-1",
+                  id: "msg-1",
+                  parts: [
+                    runningTool({
+                      sessionID: "session-1",
+                      messageID: "msg-1",
+                      id: "bash-1",
+                      callID: "call-1",
+                      tool: "bash",
+                      body: {
+                        command: "pwd",
+                      },
+                    }),
+                  ],
+                }),
+              ])
+            : ok([]),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      replay: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      const patch = await waitFor(() => {
+        const item = ui.events.findLast((event) => event.type === "stream.patch")
+        return item?.type === "stream.patch" ? item.patch : undefined
+      })
+
+      expect(patch).toEqual(
+        expect.objectContaining({
+          phase: "running",
+          status: "running bash",
+        }),
+      )
+    } finally {
+      src.close()
+      await transport.close()
+    }
+  })
+
+  test("drops completed historical subagent tabs during bootstrap", async () => {
+    const src = eventFeed()
+    const ui = footer()
+    const transport = await createSessionTransport({
+      sdk: sdk({
+        stream: src.stream,
+        messages: async ({ sessionID }) => {
+          if (sessionID !== "session-1") {
+            return ok([])
+          }
+
+          return ok([
+            assistantMessage({
+              sessionID: "session-1",
+              id: "msg-1",
+              parts: [
+                completedTool({
+                  sessionID: "session-1",
+                  messageID: "msg-1",
+                  id: "task-1",
+                  callID: "call-1",
+                  tool: "task",
+                  body: {
+                    description: "Explore run folder",
+                    subagent_type: "explore",
+                  },
+                  metadata: {
+                    sessionId: "child-1",
+                  },
+                }),
+              ],
+            }),
+          ])
+        },
+        children: async () => ok([child("child-1")]),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      const state = await waitFor(() => {
+        const item = ui.events.findLast((event) => event.type === "stream.subagent")
+        return item?.type === "stream.subagent" ? item.state : undefined
+      })
+
+      expect(state.tabs).toEqual([])
+      expect(state.details).toEqual({})
+    } finally {
+      src.close()
+      await transport.close()
+    }
+  })
+
   test("bootstraps child tabs and resumed blocker input", async () => {
     const src = eventFeed()
     const ui = footer()
@@ -487,7 +854,7 @@ describe("run stream transport", () => {
         expect.objectContaining({
           sessionID: "child-1",
           label: "Explore",
-          description: "Explore run folder",
+          description: "Pending permission",
           status: "running",
         }),
       ])
@@ -565,16 +932,16 @@ describe("run stream transport", () => {
         messages: async ({ sessionID }) => {
           if (sessionID === "session-1") {
             return ok([
-              assistantMessage({
-                sessionID: "session-1",
-                id: "msg-1",
-                parts: [
-                  completedTool({
-                    sessionID: "session-1",
-                    messageID: "msg-1",
-                    id: "task-1",
-                    callID: "call-1",
-                    tool: "task",
+                assistantMessage({
+                  sessionID: "session-1",
+                  id: "msg-1",
+                  parts: [
+                    runningTool({
+                      sessionID: "session-1",
+                      messageID: "msg-1",
+                      id: "task-1",
+                      callID: "call-1",
+                      tool: "task",
                     body: {
                       description: "Explore run.ts",
                       subagent_type: "explore",
@@ -582,10 +949,10 @@ describe("run stream transport", () => {
                     metadata: {
                       sessionId: "child-1",
                     },
-                  }),
-                ],
-              }),
-            ])
+                    }),
+                  ],
+                }),
+              ])
           }
 
           return sessionID === "child-1"
@@ -711,6 +1078,109 @@ describe("run stream transport", () => {
     }
   })
 
+  test("replays child events buffered during bootstrap once the tab is known", async () => {
+    const global = globalFeed()
+    const ui = footer()
+    const gate = defer<void>()
+    let transport: Awaited<ReturnType<typeof createSessionTransport>> | undefined
+    const task = createSessionTransport({
+      sdk: sdk({
+        globalStream: global.stream,
+        messages: async ({ sessionID }) => {
+          if (sessionID !== "session-1") {
+            return ok([])
+          }
+
+          await gate.promise
+          return ok([])
+        },
+        children: async () => ok([]),
+      }),
+      sessionID: "session-1",
+      thinking: true,
+      limits: () => ({}),
+      footer: ui.api,
+    })
+
+    try {
+      await Promise.resolve()
+      global.push(globalEvent(retry("child-1", 1, "retry child")))
+      global.push(
+        globalEvent({
+          id: "evt-child-message",
+          type: "message.updated",
+          properties: {
+            sessionID: "child-1",
+            info: assistantMessage({
+              sessionID: "child-1",
+              id: "msg-child-1",
+              parts: [],
+            }).info,
+          },
+        }),
+      )
+      global.push(globalEvent(textUpdated(textPart("txt-child-1", "msg-child-1", "", "child-1"))))
+      global.push(globalEvent(textDelta("msg-child-1", "txt-child-1", "Hello", "child-1")))
+      global.push(
+        globalEvent(
+          toolUpdated(
+            runningTool({
+              sessionID: "session-1",
+              messageID: "msg-1",
+              id: "task-1",
+              callID: "call-1",
+              tool: "task",
+              body: {
+                description: "Explore run.ts",
+                subagent_type: "explore",
+              },
+              metadata: {
+                sessionId: "child-1",
+              },
+            }),
+          ),
+        ),
+      )
+      gate.resolve()
+      transport = await task
+
+      await waitFor(() => {
+        const item = ui.events.findLast((event) => event.type === "stream.subagent")
+        return item?.type === "stream.subagent" && item.state.tabs.some((tab) => tab.sessionID === "child-1")
+          ? item
+          : undefined
+      })
+
+      transport.selectSubagent("child-1")
+
+      const detail = await waitFor(() => {
+        const item = ui.events.findLast((event) => event.type === "stream.subagent")
+        const next = item?.type === "stream.subagent" ? item.state.details["child-1"] : undefined
+        return next?.commits.some((commit) => commit.kind === "error" && commit.text === "retry child") &&
+          next.commits.some((commit) => commit.kind === "assistant" && commit.text === "Hello")
+          ? next
+          : undefined
+      })
+
+      expect(detail).toEqual({
+        sessionID: "child-1",
+        commits: expect.arrayContaining([
+          expect.objectContaining({
+            kind: "error",
+            text: "retry child",
+          }),
+          expect.objectContaining({
+            kind: "assistant",
+            text: "Hello",
+          }),
+        ]),
+      })
+    } finally {
+      global.close()
+      await transport?.close()
+    }
+  })
+
   test("streams selected subagent output from global events while it is running", async () => {
     const global = globalFeed()
     const ui = footer()