diff --git a/dsh/install.sh b/dsh/install.sh
index cf97ab3..2cda1f5 100755
--- a/dsh/install.sh
+++ b/dsh/install.sh
@@ -13,6 +13,7 @@
 #   bash dsh/install.sh --skills
 #   bash dsh/install.sh --roles
 #   bash dsh/install.sh --all
+#   bash dsh/install.sh --openspec
 #
 # Run it from a terminal, not from inside a DSH session: --global, --skills and
 # --roles write outside the session workspace and would require approval.
@@ -25,16 +26,18 @@ DO_CHECK=0
 DO_GLOBAL=0
 DO_SKILLS=0
 DO_ROLES=0
+DO_OPENSPEC=0
 
 usage() {
   cat <<EOF
-Usage: bash dsh/install.sh [--check] [--global] [--skills] [--roles] [--all]
+Usage: bash dsh/install.sh [--check] [--global] [--skills] [--roles] [--all] [--openspec]
 
   --check    verify python3, git, node, hooks, bundle, skills, and roles
   --global   back up and write \$DSH_HOME/AGENTS.md from global/CLAUDE.md
   --skills   copy superpowers skills and local dsh/skills into \$DSH_HOME/skills
   --roles    copy roles/ into \$DSH_HOME/roles
   --all      --check + --global + --skills + --roles, then print the bundle step
+  --openspec   add the agents skill adapter to the current OpenSpec project
 
 Bundle installation itself is done in DSH:
   Plugins -> install a bundle from $BUNDLE
@@ -52,6 +55,7 @@ for arg in "$@"; do
     --global) DO_GLOBAL=1 ;;
     --skills) DO_SKILLS=1 ;;
     --roles) DO_ROLES=1 ;;
+    --openspec) DO_OPENSPEC=1 ;;
     --all) DO_CHECK=1; DO_GLOBAL=1; DO_SKILLS=1; DO_ROLES=1 ;;
     -h|--help) usage; exit 0 ;;
     *) echo "unknown option: $arg" >&2; usage >&2; exit 2 ;;
@@ -278,6 +282,20 @@ print("ok: role dsh notes inserted")
 PY
 }
 
+install_openspec() {
+  local dir="${1:-$PWD}"
+  if ! command -v openspec >/dev/null 2>&1; then
+    echo "FAIL: openspec CLI not found; install it first" >&2
+    return 1
+  fi
+  if [ ! -d "$dir/openspec" ]; then
+    echo "FAIL: $dir has no openspec/ root; run: openspec init --tools agents" >&2
+    return 1
+  fi
+  ( cd "$dir" && openspec init --tools agents )
+  echo "ok: openspec agents adapter in $dir"
+}
+
 print_bundle_step() {
   cat <<EOF
 
@@ -307,6 +325,11 @@ if [ "$DO_ROLES" = 1 ]; then
   install_roles
   install_role_dsh_notes
 fi
+# A failed --openspec step must not abort the other steps: the explicit return 1
+# becomes the script status here, like check() above.
+if [ "$DO_OPENSPEC" = 1 ]; then
+  install_openspec "$PWD" || status=1
+fi
 if [ "$DO_GLOBAL" = 1 ] || [ "$DO_SKILLS" = 1 ] || [ "$DO_ROLES" = 1 ]; then
   print_bundle_step
 fi
diff --git a/dsh/tests/openspec.test.mjs b/dsh/tests/openspec.test.mjs
index 0d1982b..4477d49 100644
--- a/dsh/tests/openspec.test.mjs
+++ b/dsh/tests/openspec.test.mjs
@@ -1,6 +1,6 @@
 import assert from 'node:assert/strict'
 import { spawnSync } from 'node:child_process'
-import { chmodSync, existsSync, mkdirSync, readFileSync, symlinkSync } from 'node:fs'
+import { chmodSync, existsSync, mkdirSync, readFileSync, realpathSync, symlinkSync } from 'node:fs'
 import { dirname, join } from 'node:path'
 import test from 'node:test'
 import { fileURLToPath } from 'node:url'
@@ -66,3 +66,47 @@ test('install.sh --check warns but does not fail without the openspec CLI', () =
     cleanup(home)
   }
 })
+
+function fakeOpenspec(dir, log) {
+  const bin = join(dir, 'bin')
+  write(join(bin, 'openspec'), `#!/bin/sh\necho "$PWD $@" >> ${JSON.stringify(log)}\nexit 0\n`)
+  chmodSync(join(bin, 'openspec'), 0o755)
+  return bin
+}
+
+test('--openspec adds the agents adapter to an existing OpenSpec project', () => {
+  const home = tempDir()
+  try {
+    const project = join(home, 'project')
+    mkdirSync(join(project, 'openspec'), { recursive: true })
+    // macOS: os.tmpdir() идёт через симлинк /var -> /private/var, а $PWD в шелле — уже реальный путь
+    const realProject = realpathSync(project)
+    const log = join(home, 'calls.log')
+    const bin = fakeOpenspec(home, log)
+    const env = { ...process.env, HOME: home, DSH_HOME: join(home, '.dsh'), PATH: `${bin}:${process.env.PATH}` }
+    const run = spawnSync('bash', [script, '--openspec'], { cwd: project, env, encoding: 'utf8' })
+    assert.equal(run.status, 0, run.stderr)
+    assert.match(run.stdout, /ok: openspec agents adapter in /)
+    assert.match(readFileSync(log, 'utf8'), new RegExp(`^${realProject} init --tools agents$`, 'm'))
+  } finally {
+    cleanup(home)
+  }
+})
+
+test('--openspec refuses a project without an openspec root', () => {
+  const home = tempDir()
+  try {
+    const project = join(home, 'plain')
+    mkdirSync(project, { recursive: true })
+    const log = join(home, 'calls.log')
+    const bin = fakeOpenspec(home, log)
+    const env = { ...process.env, HOME: home, DSH_HOME: join(home, '.dsh'), PATH: `${bin}:${process.env.PATH}` }
+    const run = spawnSync('bash', [script, '--openspec'], { cwd: project, env, encoding: 'utf8' })
+    assert.notEqual(run.status, 0)
+    assert.match(run.stdout + run.stderr, /has no openspec\/ root/)
+    assert.equal(existsSync(log), false, 'openspec must not run in a non-OpenSpec project')
+    assert.equal(existsSync(join(project, 'openspec')), false)
+  } finally {
+    cleanup(home)
+  }
+})