diff --git a/src/cli/boulder/boulder.test.ts b/src/cli/boulder/boulder.test.ts
new file mode 100644
index 000000000..c4fb9bc91
--- /dev/null
+++ b/src/cli/boulder/boulder.test.ts
@@ -0,0 +1,215 @@
+import { mkdtempSync, mkdirSync, rmSync, writeFileSync } from "node:fs"
+import { join } from "node:path"
+import { tmpdir } from "node:os"
+import { afterEach, describe, expect, it } from "bun:test"
+
+import { boulder } from "./boulder"
+
+function createTempDirectory(): string {
+  return mkdtempSync(join(tmpdir(), "omo-boulder-cli-"))
+}
+
+function seedPlanAndState(directory: string): void {
+  const planDirectory = join(directory, ".sisyphus", "plans")
+  mkdirSync(planDirectory, { recursive: true })
+
+  const planAPath = join(planDirectory, "alpha.md")
+  const planBPath = join(planDirectory, "beta.md")
+
+  writeFileSync(
+    planAPath,
+    [
+      "## TODOs",
+      "- [x] 1. Alpha task done",
+      "- [ ] 2. Alpha task running",
+    ].join("\n"),
+    "utf-8",
+  )
+  writeFileSync(
+    planBPath,
+    [
+      "## TODOs",
+      "- [x] 1. Beta task done",
+      "- [x] 2. Beta task done too",
+    ].join("\n"),
+    "utf-8",
+  )
+
+  const boulderDirectory = join(directory, ".sisyphus")
+  mkdirSync(boulderDirectory, { recursive: true })
+
+  writeFileSync(
+    join(boulderDirectory, "boulder.json"),
+    JSON.stringify(
+      {
+        schema_version: 2,
+        active_work_id: "work-alpha",
+        active_plan: planAPath,
+        started_at: "2026-05-10T00:00:00.000Z",
+        ended_at: "2026-05-10T00:30:00.000Z",
+        elapsed_ms: 1_800_000,
+        status: "active",
+        updated_at: "2026-05-10T00:30:00.000Z",
+        session_ids: ["ses-1", "ses-2"],
+        plan_name: "alpha",
+        task_sessions: {
+          "todo:2": {
+            task_key: "todo:2",
+            task_label: "2",
+            task_title: "Alpha task running",
+            session_id: "ses-2",
+            elapsed_ms: 60000,
+            status: "running",
+            updated_at: "2026-05-10T00:30:00.000Z",
+          },
+        },
+        works: {
+          "work-alpha": {
+            work_id: "work-alpha",
+            active_plan: planAPath,
+            plan_name: "alpha",
+            status: "active",
+            started_at: "2026-05-10T00:00:00.000Z",
+            elapsed_ms: 1_800_000,
+            updated_at: "2026-05-10T00:30:00.000Z",
+            session_ids: ["ses-1", "ses-2"],
+            task_sessions: {
+              "todo:2": {
+                task_key: "todo:2",
+                task_label: "2",
+                task_title: "Alpha task running",
+                session_id: "ses-2",
+                elapsed_ms: 60000,
+                status: "running",
+                updated_at: "2026-05-10T00:30:00.000Z",
+              },
+            },
+          },
+          "work-beta": {
+            work_id: "work-beta",
+            active_plan: planBPath,
+            plan_name: "beta",
+            status: "completed",
+            started_at: "2026-05-10T01:00:00.000Z",
+            ended_at: "2026-05-10T01:10:00.000Z",
+            elapsed_ms: 600000,
+            updated_at: "2026-05-10T01:10:00.000Z",
+            session_ids: ["ses-3"],
+            task_sessions: {},
+          },
+        },
+      },
+      null,
+      2,
+    ),
+    "utf-8",
+  )
+}
+
+describe("boulder command", () => {
+  const createdDirectories: string[] = []
+  const outputRestores: Array<() => void> = []
+
+  afterEach(() => {
+    for (const directory of createdDirectories) {
+      rmSync(directory, { recursive: true, force: true })
+    }
+    createdDirectories.length = 0
+    for (const restoreOutput of outputRestores) {
+      restoreOutput()
+    }
+    outputRestores.length = 0
+  })
+
+  function captureOutput(target: "stdout" | "stderr", sink: { value: string }): void {
+    const originalWrite = process[target].write
+    process[target].write = ((chunk: string | Uint8Array) => {
+      sink.value += typeof chunk === "string" ? chunk : Buffer.from(chunk).toString("utf-8")
+      return true
+    }) as typeof process.stdout.write
+
+    outputRestores.push(() => {
+      process[target].write = originalWrite
+    })
+  }
+
+  it("prints multi-work text mode with plan names and percentages", async () => {
+    const directory = createTempDirectory()
+    createdDirectories.push(directory)
+    seedPlanAndState(directory)
+
+    const stdout = { value: "" }
+    const stderr = { value: "" }
+    captureOutput("stdout", stdout)
+    captureOutput("stderr", stderr)
+
+    const exitCode = await boulder({ directory })
+
+    expect(exitCode).toBe(0)
+    expect(stderr.value).toBe("")
+    expect(stdout.value).toContain("plan: alpha")
+    expect(stdout.value).toContain("plan: beta")
+    expect(stdout.value).toContain("progress: 50% (1/2)")
+    expect(stdout.value).toContain("progress: 100% (2/2)")
+    expect(stdout.value).toContain("elapsed:")
+  })
+
+  it("prints json mode with expected fields", async () => {
+    const directory = createTempDirectory()
+    createdDirectories.push(directory)
+    seedPlanAndState(directory)
+
+    const stdout = { value: "" }
+    captureOutput("stdout", stdout)
+
+    const exitCode = await boulder({ directory, json: true })
+    expect(exitCode).toBe(0)
+
+    const parsed = JSON.parse(stdout.value)
+    expect(parsed.works).toHaveLength(2)
+    expect(parsed.works[0]).toHaveProperty("work_id")
+    expect(parsed.works[0]).toHaveProperty("percentage")
+    expect(parsed.works[0]).toHaveProperty("remaining_tasks")
+  })
+
+  it("returns 1 when boulder state does not exist", async () => {
+    const directory = createTempDirectory()
+    createdDirectories.push(directory)
+
+    const stderr = { value: "" }
+    captureOutput("stderr", stderr)
+
+    const exitCode = await boulder({ directory })
+    expect(exitCode).toBe(1)
+    expect(stderr.value).toContain("No boulder state found")
+  })
+
+  it("returns 1 when workId filter matches none", async () => {
+    const directory = createTempDirectory()
+    createdDirectories.push(directory)
+    seedPlanAndState(directory)
+
+    const stderr = { value: "" }
+    captureOutput("stderr", stderr)
+
+    const exitCode = await boulder({ directory, workId: "missing" })
+    expect(exitCode).toBe(1)
+    expect(stderr.value).toContain("No boulder state found")
+  })
+
+  it("returns one work when workId filter matches", async () => {
+    const directory = createTempDirectory()
+    createdDirectories.push(directory)
+    seedPlanAndState(directory)
+
+    const stdout = { value: "" }
+    captureOutput("stdout", stdout)
+
+    const exitCode = await boulder({ directory, workId: "work-beta", json: true })
+    expect(exitCode).toBe(0)
+
+    const parsed = JSON.parse(stdout.value)
+    expect(parsed.works).toHaveLength(1)
+    expect(parsed.works[0].work_id).toBe("work-beta")
+  })
+})
diff --git a/src/cli/boulder/boulder.ts b/src/cli/boulder/boulder.ts
new file mode 100644
index 000000000..7e07bf0a6
--- /dev/null
+++ b/src/cli/boulder/boulder.ts
@@ -0,0 +1,136 @@
+import { existsSync } from "node:fs"
+
+import {
+  getBoulderFilePath,
+  getBoulderWorks,
+  getPlanProgress,
+  readBoulderState,
+  readCurrentTopLevelTask,
+  resolveBoulderPlanPathForWork,
+} from "../../features/boulder-state"
+import type { BoulderWorkState } from "../../features/boulder-state"
+import {
+  formatJsonOutput,
+  formatNoBoulderMessage,
+  formatReadErrorMessage,
+  formatTextOutput,
+} from "./formatter"
+import type { BoulderCliResult, BoulderCliWork, BoulderOptions } from "./types"
+
+function formatDurationHuman(durationMs: number): string {
+  if (durationMs < 1000) {
+    return `${durationMs}ms`
+  }
+
+  const totalSeconds = Math.floor(durationMs / 1000)
+  const seconds = totalSeconds % 60
+  const totalMinutes = Math.floor(totalSeconds / 60)
+  const minutes = totalMinutes % 60
+  const hours = Math.floor(totalMinutes / 60)
+
+  if (hours > 0) {
+    return `${hours}h ${minutes}m ${seconds}s`
+  }
+
+  if (minutes > 0) {
+    return `${minutes}m ${seconds}s`
+  }
+
+  return `${seconds}s`
+}
+
+function getElapsedMs(work: BoulderWorkState): number | undefined {
+  if (work.elapsed_ms !== undefined) {
+    return work.elapsed_ms
+  }
+
+  const startedAtMs = Date.parse(work.started_at)
+  if (Number.isNaN(startedAtMs)) {
+    return undefined
+  }
+
+  const endedAtMs = work.ended_at ? Date.parse(work.ended_at) : Date.now()
+  if (Number.isNaN(endedAtMs)) {
+    return undefined
+  }
+
+  return Math.max(0, endedAtMs - startedAtMs)
+}
+
+function buildCliWork(directory: string, work: BoulderWorkState): BoulderCliWork {
+  const planPath = resolveBoulderPlanPathForWork(directory, work)
+  const progress = getPlanProgress(planPath)
+  const elapsedMs = getElapsedMs(work)
+  const currentTask = readCurrentTopLevelTask(planPath)
+  const taskSession = currentTask ? work.task_sessions?.[currentTask.key] : undefined
+
+  let currentTaskElapsedHuman: string | undefined
+  if (taskSession?.elapsed_ms !== undefined) {
+    currentTaskElapsedHuman = formatDurationHuman(taskSession.elapsed_ms)
+  } else if (taskSession?.started_at) {
+    const startedAtMs = Date.parse(taskSession.started_at)
+    if (!Number.isNaN(startedAtMs)) {
+      currentTaskElapsedHuman = formatDurationHuman(Math.max(0, Date.now() - startedAtMs))
+    }
+  }
+
+  return {
+    work_id: work.work_id,
+    plan_name: work.plan_name,
+    active_plan: work.active_plan,
+    worktree_path: work.worktree_path,
+    status: work.status ?? "active",
+    started_at: work.started_at,
+    ended_at: work.ended_at,
+    elapsed_ms: elapsedMs,
+    elapsed_human: elapsedMs !== undefined ? formatDurationHuman(elapsedMs) : undefined,
+    total_tasks: progress.total,
+    completed_tasks: progress.completed,
+    remaining_tasks: Math.max(0, progress.total - progress.completed),
+    percentage: progress.total > 0
+      ? Math.round((progress.completed / progress.total) * 100)
+      : 0,
+    session_count: work.session_ids.length,
+    current_task: currentTask
+      ? {
+        task_key: currentTask.key,
+        task_title: currentTask.title,
+        elapsed_human: currentTaskElapsedHuman,
+      }
+      : undefined,
+  }
+}
+
+export async function boulder(options: BoulderOptions): Promise<number> {
+  const directory = options.directory ?? process.cwd()
+  const boulderFilePath = getBoulderFilePath(directory)
+  const state = readBoulderState(directory)
+  if (!state) {
+    const message = existsSync(boulderFilePath)
+      ? formatReadErrorMessage(options.json)
+      : formatNoBoulderMessage(options.json)
+
+    process.stderr.write(`${message}\n`)
+    return existsSync(boulderFilePath) ? 2 : 1
+  }
+
+  const works = getBoulderWorks(state)
+  const filteredWorks = options.workId
+    ? works.filter((work) => work.work_id === options.workId)
+    : works
+
+  if (filteredWorks.length === 0) {
+    process.stderr.write(`${formatNoBoulderMessage(options.json)}\n`)
+    return 1
+  }
+
+  const cliWorks = filteredWorks.map((work) => buildCliWork(directory, work))
+  const result: BoulderCliResult = { works: cliWorks }
+
+  const output = options.json
+    ? formatJsonOutput(result)
+    : formatTextOutput(result)
+
+  process.stdout.write(`${output}\n`)
+  return 0
+}
diff --git a/src/cli/boulder/index.ts b/src/cli/boulder/index.ts
new file mode 100644
index 000000000..1f69b2f40
--- /dev/null
+++ b/src/cli/boulder/index.ts
@@ -0,0 +1 @@
+export { boulder } from "./boulder"
diff --git a/src/cli/cli-program.ts b/src/cli/cli-program.ts
index 49256d2da..ff1b63345 100644
--- a/src/cli/cli-program.ts
+++ b/src/cli/cli-program.ts
@@ -5,6 +5,7 @@ import { getLocalVersion } from "./get-local-version"
 import { doctor } from "./doctor"
 import { refreshModelCapabilities } from "./refresh-model-capabilities"
 import { createMcpOAuthCommand } from "./mcp-oauth"
+import { boulder } from "./boulder"
 import type { InstallArgs } from "./types"
 import type { RunOptions } from "./run"
 import type { GetLocalVersionOptions } from "./get-local-version/types"
@@ -202,6 +203,21 @@ program
     console.log(`oh-my-opencode v${VERSION}`)
   })
 
+program
+  .command("boulder")
+  .description("Show boulder progress, elapsed time, and per-task statistics")
+  .option("-d, --directory <path>", "Working directory")
+  .option("-w, --work-id <id>", "Filter to a specific work")
+  .option("--json", "Output as JSON")
+  .action(async (options) => {
+    const exitCode = await boulder({
+      directory: options.directory,
+      workId: options.workId,
+      json: options.json ?? false,
+    })
+    process.exit(exitCode)
+  })
+
 program.addCommand(createMcpOAuthCommand())
 
 export function runCli(): void {