diff --git a/dsh/PORT.md b/dsh/PORT.md
index c111a13..26f4531 100644
--- a/dsh/PORT.md
+++ b/dsh/PORT.md
@@ -350,6 +350,16 @@ profile was removed; the real `desktop` profile was not touched.
 
 - **DSH is 0.2.1-rc.3.** The plugin/event API is not frozen; pin the version and
   re-run the tests after upgrades.
+- **Contract self-check.** The plugin/event API drift is now caught from inside
+  DSH: at activation the bundle checks the contract it depends on
+  (`ctx.tools.guard`, `ctx.on` for `agent/pre-step`, `ctx.inject` for commands,
+  `workingDirectory.get`), logs
+  `[dsh-harness] self-check: <feature> not-ok: <detail>` for each missing
+  service, and skips only the guard wiring when `tools.guard` is missing
+  (bootstrap and `/role` keep working when their own services exist).
+  `/dsh-harness-check` re-runs the same check on demand. This is the in-DSH
+  compat check that closes RV-11 (D-6) — the terminal `--check` cannot see the
+  SDK inside `app.asar`.
 - **Local profile imports are not resolved from the DSH installation.** The
   first install attempt failed at activation with
   `ERR_MODULE_NOT_FOUND: Cannot find package '@deepseek-ai/schemastery'`. The
diff --git a/dsh/README.md b/dsh/README.md
index 5654b9e..e54378a 100644
--- a/dsh/README.md
+++ b/dsh/README.md
@@ -185,3 +185,11 @@ repository layout:
   skill and `openspec/changes/dsh-sdd/`.
 - OpenSpec-скиллы проект получает сам (`openspec init --tools agents` или
   `--openspec`); обвязка ставит их только в проект, не в `~/.dsh`.
+- The bundle self-checks the DSH contract it depends on at activation:
+  `ctx.tools.guard`, `ctx.on` for `agent/pre-step`, `ctx.inject` for commands,
+  `workingDirectory.get`. Each missing service is logged as
+  `[dsh-harness] self-check: <feature> not-ok: …`; the guard wiring is the only
+  feature skipped when its service is missing — bootstrap and `/role` keep
+  working when their own services exist. The `/dsh-harness-check` command
+  re-runs the same check on demand (one `ok` / `not-ok` line per feature).
+  Disable with `selfCheck: false` / `checkCommand: false`.
diff --git a/dsh/bundle/command-check.js b/dsh/bundle/command-check.js
new file mode 100644
index 0000000..e2f8e90
--- /dev/null
+++ b/dsh/bundle/command-check.js
@@ -0,0 +1,33 @@
+/**
+ * Human-facing `dsh-harness-check` command for DeepSeek Harness.
+ *
+ * Re-runs the bundle contract self-check on demand and prints one line per
+ * feature. Mirrors `command-role.js`: the same object-form
+ * `commands.register`, the same `{ kind, text }` result shape.
+ */
+
+export function registerCheckCommand({ commands, collect, logger }) {
+  commands.register({
+    name: 'dsh-harness-check',
+    description: 'Проверить контракт DSH, на который опирается dsh-harness',
+    handler: async () => {
+      let report
+      try {
+        report = collect()
+      } catch (error) {
+        logger?.warn?.('[dsh-harness] dsh-harness-check failed: %s', error?.message ?? error)
+        return { kind: 'error', text: String(error?.message ?? error) }
+      }
+
+      const problems = report.filter((entry) => !entry.ok)
+      const lines = report.map((entry) =>
+        entry.ok ? `${entry.feature}: ok` : `${entry.feature}: not-ok — ${entry.detail}`,
+      )
+      const headline =
+        problems.length === 0
+          ? 'dsh-harness self-check: all ok'
+          : `dsh-harness self-check: ${problems.length} problem(s)`
+      return { kind: 'success', text: [headline, ...lines].join('\n') }
+    },
+  })
+}
diff --git a/dsh/bundle/index.js b/dsh/bundle/index.js
index 4d91a6b..a3a13ac 100644
--- a/dsh/bundle/index.js
+++ b/dsh/bundle/index.js
@@ -22,11 +22,13 @@ import { homedir } from 'node:os'
 import { dirname, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import { registerRoleCommand } from './command-role.js'
+import { registerCheckCommand } from './command-check.js'
 import { createGuard } from './lib/guards.js'
 import { isBootstrapVisible, prepareBootstrap } from './lib/bootstrap.js'
 import { isLegacyClaudePath, warnLegacyOnce } from './lib/legacy.js'
 import { createUserMessage } from './lib/message.js'
 import { DEFAULT_ROLE_NAMES } from './lib/role.js'
+import { collectSelfCheck } from './lib/selfcheck.js'
 
 export const name = 'dsh-harness'
 export const inject = ['tools', 'workingDirectory']
@@ -77,6 +79,8 @@ const DEFAULTS = {
   bootstrap: true,
   bootstrapSubagents: false,
   roleCommand: true,
+  selfCheck: true,
+  checkCommand: true,
   hooksDir: '',
   rolesDir: '',
   projectRolesDir: '',
@@ -99,7 +103,13 @@ export function apply(ctx, rawConfig = {}) {
   }
   const guard = createGuard({ hooksDir, logger: ctx.logger })
 
-  if (config.enabled && config.guards) {
+  const selfCheckReport =
+    config.enabled && config.selfCheck ? collectSelfCheck(ctx) : null
+  const guardsOk = selfCheckReport
+    ? selfCheckReport.find((entry) => entry.feature === 'guards')?.ok === true
+    : true
+
+  if (config.enabled && config.guards && guardsOk) {
     // A synchronous, monotonic guard: it runs after the extensible
     // `tools/pre-execute` waterfall, so no other listener can turn a denial
     // back into permission.
@@ -140,19 +150,36 @@ export function apply(ctx, rawConfig = {}) {
     })
   }
 
-  if (config.enabled && config.roleCommand) {
+  if (config.enabled && (config.roleCommand || config.checkCommand)) {
     ctx.inject(['commands'], (commandCtx) => {
-      registerRoleCommand({
-        commands: commandCtx.commands,
-        workingDirectory: ctx.workingDirectory,
-        rolesDir,
-        projectRolesDir: config.projectRolesDir,
-        roleNames: config.roleNames,
-        logger: ctx.logger,
-      })
+      if (config.roleCommand) {
+        registerRoleCommand({
+          commands: commandCtx.commands,
+          workingDirectory: ctx.workingDirectory,
+          rolesDir,
+          projectRolesDir: config.projectRolesDir,
+          roleNames: config.roleNames,
+          logger: ctx.logger,
+        })
+      }
+      if (config.checkCommand) {
+        registerCheckCommand({
+          commands: commandCtx.commands,
+          collect: () => collectSelfCheck(ctx),
+          logger: ctx.logger,
+        })
+      }
     })
   }
 
+  if (selfCheckReport) {
+    for (const entry of selfCheckReport) {
+      if (!entry.ok) {
+        ctx.logger?.error?.('[dsh-harness] self-check: %s not-ok: %s', entry.feature, entry.detail)
+      }
+    }
+  }
+
   ctx.logger?.info?.(
     '[dsh-harness] ready: hooks=%s, bootstrap=%s, /role=%s',
     config.guards ? hooksDir : 'off',
diff --git a/dsh/bundle/lib/selfcheck.js b/dsh/bundle/lib/selfcheck.js
new file mode 100644
index 0000000..d61d978
--- /dev/null
+++ b/dsh/bundle/lib/selfcheck.js
@@ -0,0 +1,47 @@
+/**
+ * Activation-time self-check of the DSH contract the bundle depends on.
+ *
+ * Pure shape inspection: no ctx service is invoked, only checked for presence.
+ * A DSH upgrade may rename or remove a service; the check turns that into a
+ * visible `not-ok` line (activation log plus the `dsh-harness-check` command)
+ * instead of a TypeError at first use.
+ */
+
+const CONTRACT = [
+  {
+    feature: 'guards',
+    label: 'tools.guard',
+    available: (ctx) => typeof ctx?.tools?.guard === 'function',
+  },
+  {
+    feature: 'bootstrap',
+    label: 'ctx.on (agent/pre-step)',
+    available: (ctx) => typeof ctx?.on === 'function',
+  },
+  {
+    feature: 'commands',
+    label: 'ctx.inject',
+    available: (ctx) => typeof ctx?.inject === 'function',
+  },
+  {
+    feature: 'workingDirectory',
+    label: 'workingDirectory.get',
+    available: (ctx) => typeof ctx?.workingDirectory?.get === 'function',
+  },
+]
+
+/**
+ * Inspect a ctx-like object without calling anything on it.
+ * @returns {{feature: 'guards'|'bootstrap'|'commands'|'workingDirectory',
+ *           ok: boolean, detail: string}[]}
+ */
+export function collectSelfCheck(ctxLike) {
+  return CONTRACT.map(({ feature, label, available }) => {
+    const ok = available(ctxLike)
+    return {
+      feature,
+      ok,
+      detail: ok ? `${label}: available` : `${label}: missing or not a function`,
+    }
+  })
+}
diff --git a/dsh/tests/selfcheck.test.mjs b/dsh/tests/selfcheck.test.mjs
new file mode 100644
index 0000000..32098f2
--- /dev/null
+++ b/dsh/tests/selfcheck.test.mjs
@@ -0,0 +1,80 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+import { collectSelfCheck } from '../bundle/lib/selfcheck.js'
+import { registerCheckCommand } from '../bundle/command-check.js'
+
+const FEATURES = ['guards', 'bootstrap', 'commands', 'workingDirectory']
+
+/** A ctx-like with every service the bundle depends on. */
+function fullCtx() {
+  return {
+    tools: { guard() {} },
+    on() {},
+    inject() {},
+    workingDirectory: { get() {} },
+  }
+}
+
+test('collectSelfCheck ok on full ctx-like', () => {
+  const report = collectSelfCheck(fullCtx())
+  assert.deepEqual(
+    report.map((entry) => entry.feature),
+    FEATURES,
+  )
+  for (const entry of report) {
+    assert.equal(entry.ok, true, `${entry.feature} ok`)
+    assert.equal(typeof entry.detail, 'string', `${entry.feature} detail is a string`)
+    assert.ok(entry.detail.length > 0, `${entry.feature} detail is non-empty`)
+  }
+})
+
+test('collectSelfCheck flags missing tools.guard', () => {
+  const ctx = fullCtx()
+  ctx.tools = {}
+  const report = collectSelfCheck(ctx)
+
+  const guards = report.find((entry) => entry.feature === 'guards')
+  assert.equal(guards.ok, false)
+  assert.match(guards.detail, /tools\.guard/)
+
+  for (const entry of report.filter((entry) => entry.feature !== 'guards')) {
+    assert.equal(entry.ok, true, `${entry.feature} stays ok`)
+  }
+})
+
+test('collectSelfCheck flags missing on()', () => {
+  const ctx = fullCtx()
+  ctx.on = undefined
+  const report = collectSelfCheck(ctx)
+
+  const bootstrap = report.find((entry) => entry.feature === 'bootstrap')
+  assert.equal(bootstrap.ok, false)
+
+  for (const entry of report.filter((entry) => entry.feature !== 'bootstrap')) {
+    assert.equal(entry.ok, true, `${entry.feature} stays ok`)
+  }
+})
+
+test('registerCheckCommand builds report text', async () => {
+  let captured
+  const commands = {
+    register(def) {
+      captured = def
+    },
+  }
+
+  registerCheckCommand({ commands, collect: () => collectSelfCheck(fullCtx()) })
+  assert.equal(captured.name, 'dsh-harness-check')
+
+  const okResult = await captured.handler({})
+  assert.match(okResult.text, /guards: ok/)
+  assert.match(okResult.text, /all ok/)
+
+  const brokenCtx = fullCtx()
+  brokenCtx.tools = {}
+  registerCheckCommand({ commands, collect: () => collectSelfCheck(brokenCtx) })
+
+  const badResult = await captured.handler({})
+  assert.match(badResult.text, /guards: not-ok/)
+  assert.match(badResult.text, /problem/)
+})