diff --git a/dsh/bundle/command-approve.js b/dsh/bundle/command-approve.js
new file mode 100644
index 0000000..56aa63f
--- /dev/null
+++ b/dsh/bundle/command-approve.js
@@ -0,0 +1,264 @@
+/**
+ * Human-facing `/approve` command for DeepSeek Harness.
+ *
+ * `/approve <change-id> design|plan` is the only writer of
+ * `openspec/changes/<id>/approval.md` (D-1). The command checks the upstream
+ * artifacts, asks the owner through `userQuestions.ask` (D-12), and only then
+ * merges the new section into the existing file. A missing user-questions
+ * service refuses instead of writing, so no model tool can approve itself.
+ *
+ * Mirrors `command-role.js`: object-form `commands.register`, the same
+ * `{ kind, text }` result shape.
+ */
+
+import { mkdirSync, readFileSync, readdirSync, statSync, writeFileSync } from 'node:fs'
+import { dirname, join, relative, resolve } from 'node:path'
+import {
+  APPROVAL_FILE,
+  CHANGE_DIR,
+  PLANS_DIR,
+  extractSpec,
+  hasDesignApproval,
+  hashPlan,
+  parseApproval,
+  resolveChangeFromSpec,
+  serializeApproval,
+} from './lib/gates.js'
+
+const USAGE = [
+  'Usage: /approve <change-id> design|plan',
+  '  design — record the owner approval of the change design',
+  '  plan   — record the owner approval of the plan whose **Spec:** is <change-id>',
+].join('\n')
+
+const DESIGN_ARTIFACTS = ['proposal.md', 'design.md', 'builder-check.md']
+const APPROVE_LABEL = 'Approve'
+const CANCEL_LABEL = 'Cancel'
+/** Change ids are directory names: keep them one safe path segment. */
+const CHANGE_ID = /^[A-Za-z0-9][A-Za-z0-9._-]*$/u
+
+function isFile(path) {
+  try {
+    return statSync(path).isFile()
+  } catch {
+    return false
+  }
+}
+
+function readText(path) {
+  try {
+    return readFileSync(path, 'utf8')
+  } catch {
+    return null
+  }
+}
+
+function refusal(text) {
+  return { kind: 'error', text: `Refused: ${text}` }
+}
+
+function usage(text) {
+  return { kind: 'error', text: `${text}\n${USAGE}` }
+}
+
+/**
+ * Read the answer of `userQuestions.ask`.
+ *
+ * The DSH UserQuestionService resolves to `{ answers: [{ id, selected }] }`;
+ * the plan/brief contract also allows `{ approved }` / `{ confirmed }` (and a
+ * bare `true`) so the command stays testable without the runtime. Anything
+ * else — a skipped question, a cancel, a timeout, null — is not an approval.
+ */
+function isApproved(answer) {
+  if (answer === true) return true
+  if (answer === null || typeof answer !== 'object') return false
+
+  const flag = answer.approved ?? answer.confirmed
+  if (flag !== undefined) return Boolean(flag)
+
+  const items = Array.isArray(answer.answers) ? answer.answers : []
+  return items.some(
+    (item) => item !== null && typeof item === 'object' && Array.isArray(item.selected) && item.selected.includes(APPROVE_LABEL),
+  )
+}
+
+/**
+ * Ask the owner and return `{ ok: true }` or a refusal `{ ok: false, text }`.
+ * The detail shows exactly what is being approved; the answer is never
+ * inferred from the absence of an error.
+ */
+async function askOwner(userQuestions, { changeId, kind, detail, agent, signal }) {
+  if (typeof userQuestions?.ask !== 'function') {
+    return { ok: false, text: 'userQuestions service unavailable; /approve requires it' }
+  }
+
+  const request = {
+    questions: [
+      {
+        id: `approve-${kind}`,
+        header: 'Approve',
+        question: `Approve ${changeId} ${kind}?`,
+        detail,
+        options: [
+          {
+            label: APPROVE_LABEL,
+            description: `Write the ${kind} approval to openspec/changes/${changeId}/approval.md.`,
+          },
+          { label: CANCEL_LABEL, description: 'Write nothing.' },
+        ],
+      },
+    ],
+  }
+  if (agent !== undefined) request.agent = agent
+  if (signal !== undefined) request.signal = signal
+
+  let answer
+  try {
+    answer = await userQuestions.ask(request)
+  } catch (error) {
+    return { ok: false, text: `userQuestions failed: ${String(error?.message ?? error)}` }
+  }
+
+  return isApproved(answer) ? { ok: true } : { ok: false, text: 'not confirmed' }
+}
+
+/** Merge one section into approval.md, leaving every other section as is. */
+function writeApproval(root, changeId, mutate) {
+  const path = join(root, CHANGE_DIR, changeId, APPROVAL_FILE)
+  const next = mutate(parseApproval(readText(path)))
+  mkdirSync(dirname(path), { recursive: true })
+  writeFileSync(path, serializeApproval(next), 'utf8')
+  return path
+}
+
+/** Existing plans under docs/superpowers/plans/ whose **Spec:** is `<id>`. */
+function plansForChange(root, changeId) {
+  const plansDir = join(root, PLANS_DIR)
+  let names
+  try {
+    names = readdirSync(plansDir)
+  } catch {
+    return []
+  }
+
+  const found = []
+  for (const name of [...names].sort()) {
+    if (!name.endsWith('.md')) continue
+    const path = join(plansDir, name)
+    if (!isFile(path)) continue
+    const content = readText(path)
+    if (content === null) continue
+    if (resolveChangeFromSpec(extractSpec(content)) === changeId) found.push(path)
+  }
+  return found
+}
+
+function approvalText(root, path) {
+  return relative(root, path).split('\\').join('/')
+}
+
+async function approveDesign({ root, changeId, userQuestions, agent, signal }) {
+  const changeDir = join(root, CHANGE_DIR, changeId)
+  const missing = DESIGN_ARTIFACTS.filter((name) => !isFile(join(changeDir, name)))
+  if (missing.length > 0) {
+    const listed = missing.map((name) => `openspec/changes/${changeId}/${name}`).join(', ')
+    return refusal(`design approval requires the change artifacts; missing: ${listed}.`)
+  }
+
+  const asked = await askOwner(userQuestions, {
+    changeId,
+    kind: 'design',
+    detail: `Change: openspec/changes/${changeId} (proposal.md, design.md, builder-check.md).`,
+    agent,
+    signal,
+  })
+  if (!asked.ok) return refusal(asked.text)
+
+  const at = new Date().toISOString()
+  const path = writeApproval(root, changeId, (approval) => ({
+    ...approval,
+    design: { by: 'owner', at },
+  }))
+  return {
+    kind: 'success',
+    text: `Approved ${changeId} design at ${at}; wrote ${approvalText(root, path)}.`,
+  }
+}
+
+async function approvePlan({ root, changeId, userQuestions, agent, signal }) {
+  const approval = parseApproval(readText(join(root, CHANGE_DIR, changeId, APPROVAL_FILE)))
+  if (!hasDesignApproval(approval)) {
+    return refusal(`design not approved; run /approve ${changeId} design`)
+  }
+
+  const plans = plansForChange(root, changeId)
+  if (plans.length === 0) {
+    return refusal(
+      `no plan for ${changeId} found under ${PLANS_DIR.split('\\').join('/')}/ with **Spec:** openspec/changes/${changeId}.`,
+    )
+  }
+  if (plans.length > 1) {
+    const listed = plans.map((path) => approvalText(root, path)).join(', ')
+    return refusal(`several plans reference ${changeId}: ${listed}. Keep exactly one.`)
+  }
+
+  const [planPath] = plans
+  const sha256 = hashPlan(planPath)
+  if (sha256 === '') {
+    return refusal(`cannot read plan ${approvalText(root, planPath)}.`)
+  }
+
+  const asked = await askOwner(userQuestions, {
+    changeId,
+    kind: 'plan',
+    detail: `Plan: ${approvalText(root, planPath)} (sha256 ${sha256}).`,
+    agent,
+    signal,
+  })
+  if (!asked.ok) return refusal(asked.text)
+
+  const at = new Date().toISOString()
+  const path = writeApproval(root, changeId, (current) => ({
+    ...current,
+    plan: { by: 'owner', at, sha256 },
+  }))
+  return {
+    kind: 'success',
+    text: `Approved ${changeId} plan at ${at} (sha256 ${sha256}); wrote ${approvalText(root, path)}.`,
+  }
+}
+
+export function registerApproveCommand({ commands, userQuestions, repoRoot, logger }) {
+  commands.register({
+    name: 'approve',
+    description: 'Утвердить design или plan change (единственный писатель approval.md)',
+    input: { hint: '<change-id> design|plan' },
+    handler: async ({ agent, rawInput, signal } = {}) => {
+      const parts =
+        typeof rawInput === 'string' ? rawInput.trim().split(/\s+/u).filter((part) => part !== '') : []
+
+      if (parts.length !== 2) {
+        return usage('Missing arguments: expected <change-id> design|plan.')
+      }
+
+      const [changeId, kind] = parts
+      if (!CHANGE_ID.test(changeId)) {
+        return usage(`Invalid change id "${changeId}".`)
+      }
+      if (kind !== 'design' && kind !== 'plan') {
+        return usage(`Unknown kind "${kind}".`)
+      }
+
+      const root = resolve(repoRoot || process.cwd())
+      try {
+        if (kind === 'design') {
+          return await approveDesign({ root, changeId, userQuestions, agent, signal })
+        }
+        return await approvePlan({ root, changeId, userQuestions, agent, signal })
+      } catch (error) {
+        logger?.warn?.('[dsh-harness] /approve failed: %s', error?.message ?? error)
+        return refusal(`/approve failed: ${String(error?.message ?? error)}`)
+      }
+    },
+  })
+}
diff --git a/dsh/tests/approve.test.mjs b/dsh/tests/approve.test.mjs
new file mode 100644
index 0000000..8f2016d
--- /dev/null
+++ b/dsh/tests/approve.test.mjs
@@ -0,0 +1,223 @@
+import assert from 'node:assert/strict'
+import { createHash } from 'node:crypto'
+import { existsSync, readFileSync } from 'node:fs'
+import { join } from 'node:path'
+import test from 'node:test'
+import { registerApproveCommand } from '../bundle/command-approve.js'
+import { hashPlan, parseApproval, serializeApproval } from '../bundle/lib/gates.js'
+import { cleanup, tempDir, write } from './helpers.mjs'
+
+const PLAN_TEXT = [
+  '# Plan X',
+  '',
+  '**Spec:** `openspec/changes/demo/`',
+  '',
+  '## Task 1',
+  '',
+  'Do the work.',
+  '',
+].join('\n')
+
+const ISO = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}Z$/u
+const APPROVE = 'Approve'
+
+/** A throwaway repository with the design artifacts and one demo plan. */
+function repoFixture({ builderCheck = true } = {}) {
+  const tmp = tempDir('dsh-approve-')
+  const repo = join(tmp, 'repo')
+  write(join(repo, 'openspec', 'changes', 'demo', 'proposal.md'), '# Proposal\n')
+  write(join(repo, 'openspec', 'changes', 'demo', 'design.md'), '# Design\n')
+  if (builderCheck) write(join(repo, 'openspec', 'changes', 'demo', 'builder-check.md'), '# Check\n')
+  const planPath = join(repo, 'docs', 'superpowers', 'plans', 'plan-x.md')
+  write(planPath, PLAN_TEXT)
+  return { tmp, repo, planPath }
+}
+
+function approvalPath(repo) {
+  return join(repo, 'openspec', 'changes', 'demo', 'approval.md')
+}
+
+/** An ask() answer batch shaped like the DSH UserQuestionService result. */
+function approveAnswer(kind = 'design') {
+  return { answers: [{ id: `approve-${kind}`, selected: [APPROVE], custom: undefined }] }
+}
+
+/**
+ * Wire the command against a fake `commands.register` that captures the
+ * registered definition, and a scripted `userQuestions.ask`.
+ */
+function setup(repo, { answer, missingService = false } = {}) {
+  const captured = {}
+  const commands = {
+    register(definition) {
+      Object.assign(captured, definition)
+    },
+  }
+  const calls = []
+  let userQuestions
+  if (!missingService) {
+    userQuestions = {
+      async ask(request) {
+        calls.push(request)
+        return answer
+      },
+    }
+  }
+  registerApproveCommand({
+    commands,
+    userQuestions,
+    repoRoot: repo,
+    logger: { warn() {} },
+  })
+  return { captured, calls, run: (rawInput) => captured.handler({ rawInput }) }
+}
+
+function shaOf(path) {
+  return createHash('sha256').update(readFileSync(path)).digest('hex')
+}
+
+test('approve design refuses without builder-check.md', async () => {
+  const { tmp, repo } = repoFixture({ builderCheck: false })
+  try {
+    const harness = setup(repo, { answer: approveAnswer('design') })
+    const result = await harness.run('demo design')
+
+    assert.match(result.text, /builder-check\.md/u)
+    assert.equal(existsSync(approvalPath(repo)), false, 'no approval.md is written')
+    assert.equal(harness.calls.length, 0, 'the owner is not asked when artifacts are missing')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve design writes design section (by owner, at ISO)', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    const existingPlan = { by: 'aep', at: '2026-10-25T11:30:00+04:00', sha256: 'a'.repeat(64) }
+    write(approvalPath(repo), serializeApproval({ plan: existingPlan }))
+
+    const harness = setup(repo, { answer: approveAnswer('design') })
+    const result = await harness.run('demo design')
+
+    assert.equal(result.kind, 'success')
+    const request = harness.calls[0].questions[0]
+    assert.equal(request.question, 'Approve demo design?')
+
+    const parsed = parseApproval(readFileSync(approvalPath(repo), 'utf8'))
+    assert.equal(parsed.design.by, 'owner')
+    assert.match(parsed.design.at, ISO)
+    assert.equal(Number.isNaN(Date.parse(parsed.design.at)), false)
+    assert.deepEqual(parsed.plan, existingPlan, 'the pre-existing plan section is untouched')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve design refuses without confirmation', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    const harness = setup(repo, {
+      answer: { answers: [{ id: 'approve-design', selected: ['Cancel'] }] },
+    })
+    const result = await harness.run('demo design')
+
+    assert.match(result.text, /not confirmed/u)
+    assert.equal(existsSync(approvalPath(repo)), false, 'no approval.md is written')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve plan refuses without design section', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    const harness = setup(repo, { answer: approveAnswer('plan') })
+    const result = await harness.run('demo plan')
+
+    assert.match(result.text, /design not approved/u)
+    assert.match(result.text, /\/approve demo design/u)
+    assert.equal(existsSync(approvalPath(repo)), false, 'no approval.md is written')
+    assert.equal(harness.calls.length, 0, 'the owner is not asked before the design gate passes')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve plan refuses when two plans reference the change', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    write(join(repo, 'docs', 'superpowers', 'plans', 'plan-y.md'), PLAN_TEXT)
+    write(
+      approvalPath(repo),
+      serializeApproval({ design: { by: 'aep', at: '2026-10-25T10:00:00+04:00' } }),
+    )
+    const before = readFileSync(approvalPath(repo), 'utf8')
+
+    const harness = setup(repo, { answer: approveAnswer('plan') })
+    const result = await harness.run('demo plan')
+
+    assert.match(result.text, /plan-x\.md/u)
+    assert.match(result.text, /plan-y\.md/u)
+    assert.equal(readFileSync(approvalPath(repo), 'utf8'), before, 'approval.md is untouched')
+    assert.equal(harness.calls.length, 0, 'the owner is not asked when the plan is ambiguous')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve plan writes plan section with sha256 of the plan', async () => {
+  const { tmp, repo, planPath } = repoFixture()
+  try {
+    const design = { by: 'aep', at: '2026-10-25T10:00:00+04:00' }
+    write(approvalPath(repo), serializeApproval({ design }))
+
+    const harness = setup(repo, { answer: approveAnswer('plan') })
+    const result = await harness.run('demo plan')
+
+    assert.equal(result.kind, 'success')
+    const request = harness.calls[0].questions[0]
+    assert.equal(request.question, 'Approve demo plan?')
+
+    const parsed = parseApproval(readFileSync(approvalPath(repo), 'utf8'))
+    assert.equal(parsed.plan.by, 'owner')
+    assert.match(parsed.plan.at, ISO)
+    assert.equal(parsed.plan.sha256, shaOf(planPath))
+    assert.equal(parsed.plan.sha256, hashPlan(planPath))
+    assert.deepEqual(parsed.design, design, 'the design section is untouched')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve refuses when userQuestions is missing', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    const harness = setup(repo, { missingService: true })
+    const result = await harness.run('demo design')
+
+    assert.match(result.text, /userQuestions service unavailable/u)
+    assert.match(result.text, /\/approve requires it/u)
+    assert.equal(existsSync(approvalPath(repo)), false, 'no approval.md is written')
+  } finally {
+    cleanup(tmp)
+  }
+})
+
+test('approve with unknown kind returns usage', async () => {
+  const { tmp, repo } = repoFixture()
+  try {
+    const harness = setup(repo, { answer: approveAnswer() })
+
+    const unknown = await harness.run('demo review')
+    assert.match(unknown.text, /Usage: \/approve <change-id> design\|plan/u)
+    assert.equal(unknown.kind, 'error')
+
+    const missing = await harness.run('demo')
+    assert.match(missing.text, /Usage: \/approve <change-id> design\|plan/u)
+
+    assert.equal(harness.calls.length, 0, 'nothing is asked')
+    assert.equal(existsSync(approvalPath(repo)), false, 'no approval.md is written')
+  } finally {
+    cleanup(tmp)
+  }
+})