diff --git a/.claude/CHANGELOG.md b/.claude/CHANGELOG.md
index ab2e544..b36f614 100644
--- a/.claude/CHANGELOG.md
+++ b/.claude/CHANGELOG.md
@@ -5,6 +5,28 @@ Each entry: **what** changed, **why** it was needed, **files** touched.
 
 ---
 
+## 2026-05-25 — v0.6.1 — OpenSpec (spec-driven development CLI)
+
+**What**
+- `lib/plugins.sh` — new `install_openspec()` (npm-global install of `@fission-ai/openspec`).
+- `profiles/cli-bundle/09-plugins.sh` — `INSTALL_OPENSPEC=true` block, installs OpenSpec + appends `OPENSPEC_TELEMETRY=0` to `~/.bashrc` (default off; opt-in by setting `OPENSPEC_TELEMETRY=1`).
+- `profiles/cli-bundle/.env.example` — `INSTALL_OPENSPEC`, `OPENSPEC_VERSION`, `OPENSPEC_TELEMETRY`.
+- `profiles/cli-bundle/README.md` — OpenSpec section with `openspec init` + `/opsx:*` usage.
+- `tests/test_plugins.bats` — 2 new tests (missing-npm error path; correct npm-install dispatch with PATH-isolated stub).
+
+**Why**
+- OpenSpec is universal — any AI CLI (Claude, Codex, Cursor, OpenCode, Antigravity) can invoke it via the `/opsx:*` slash commands once a project has run `openspec init`. No per-CLI binding needed.
+- Single npm-global install + telemetry-off default = same pattern already used for Codex/Claude CLIs.
+
+**Files**
+- `lib/plugins.sh` (+ `install_openspec`)
+- `profiles/cli-bundle/09-plugins.sh` (block)
+- `profiles/cli-bundle/.env.example` (3 vars)
+- `profiles/cli-bundle/README.md` (section)
+- `tests/test_plugins.bats` (2 tests, total 31)
+
+---
+
 ## 2026-05-25 — v0.6.0 — Official plugins (Linear/Slack/etc) + headless browser as base tool
 
 **What**
diff --git a/lib/plugins.sh b/lib/plugins.sh
index 55b4c91..a13cc06 100644
--- a/lib/plugins.sh
+++ b/lib/plugins.sh
@@ -42,6 +42,20 @@ install_claude_plugin() {
   claude_headless "/reload-plugins" || true
 }
 
+# Install OpenSpec — spec-driven development CLI. npm-global; works inside
+# any AI assistant via /opsx:* slash commands (no per-CLI binding).
+# Upstream: https://github.com/Fission-AI/OpenSpec
+install_openspec() {
+  local version="${OPENSPEC_VERSION:-latest}"
+  if ! command -v npm >/dev/null 2>&1; then
+    echo "ERROR: npm not on PATH — OpenSpec requires Node.js."
+    return 1
+  fi
+  echo "==> Installing @fission-ai/openspec@${version} globally"
+  npm install -g "@fission-ai/openspec@${version}"
+  openspec --version 2>/dev/null || true
+}
+
 # Install gstack into a target CLI's skills dir.
 # $1 = host name (claude, opencode, etc.)
 install_gstack_for() {
diff --git a/profiles/cli-bundle/.env.example b/profiles/cli-bundle/.env.example
index fafb02b..198ab8a 100644
--- a/profiles/cli-bundle/.env.example
+++ b/profiles/cli-bundle/.env.example
@@ -115,6 +115,14 @@ INSTALL_GSTACK=false
 # Space-separated list. Valid: claude opencode
 GSTACK_TARGETS=claude
 
+# OpenSpec — spec-driven development. Universal (works in any AI CLI via
+# /opsx:* slash commands once invoked from a project that ran `openspec init`).
+# Upstream: https://github.com/Fission-AI/OpenSpec
+INSTALL_OPENSPEC=false
+OPENSPEC_VERSION=latest
+# Telemetry off (industry standard). Set to 1 to opt in.
+OPENSPEC_TELEMETRY=0
+
 # --- Official Anthropic marketplace plugins (Claude-only) ---
 # Bundle pre-configured MCP + skills + slash commands. Richer than the raw
 # MCP registrations in 06-mcp.sh — either can be used (or both).
diff --git a/profiles/cli-bundle/09-plugins.sh b/profiles/cli-bundle/09-plugins.sh
index 38e8523..d7c2936 100644
--- a/profiles/cli-bundle/09-plugins.sh
+++ b/profiles/cli-bundle/09-plugins.sh
@@ -94,6 +94,19 @@ if [[ "${INSTALL_SUPERPOWERS:-false}" == "true" ]]; then
   fi
 fi
 
+# --- OpenSpec (universal: works in any AI CLI via slash commands) ----------
+if [[ "${INSTALL_OPENSPEC:-false}" == "true" ]]; then
+  install_openspec
+  # Telemetry off by default unless operator opts in.
+  if ! grep -q 'OPENSPEC_TELEMETRY' "$HOME/.bashrc" 2>/dev/null; then
+    cat >> "$HOME/.bashrc" <<EOF
+
+# OpenSpec
+export OPENSPEC_TELEMETRY="${OPENSPEC_TELEMETRY:-0}"
+EOF
+  fi
+fi
+
 # --- Official Anthropic marketplace plugins (Claude-only) -----------------
 # These bundle pre-configured MCP servers + skills + slash commands.
 # Richer than the raw MCP registrations in 06-mcp.sh; either can be used.
diff --git a/profiles/cli-bundle/README.md b/profiles/cli-bundle/README.md
index eebc44d..5a768b0 100644
--- a/profiles/cli-bundle/README.md
+++ b/profiles/cli-bundle/README.md
@@ -204,6 +204,29 @@ manual com palpite (padrão Gemini CLI). Sem tentativa automática.
 **Manual hints**: Codex/Cursor/OpenCode imprimem mensagem com comando exato
 pra colar dentro da sessão. Sem CLI flag headless documentada.
 
+### OpenSpec (universal — funciona em qualquer CLI)
+
+[OpenSpec](https://github.com/Fission-AI/OpenSpec) é framework de
+spec-driven development. CLI standalone (`npm i -g @fission-ai/openspec`)
+que cria pasta `openspec/` no projeto com proposals/specs/design/tasks.
+Agentes (Claude, Codex, Cursor, OpenCode, Antigravity) invocam via slash
+commands `/opsx:propose`, `/opsx:plan`, etc.
+
+```env
+INSTALL_OPENSPEC=true
+OPENSPEC_VERSION=latest
+OPENSPEC_TELEMETRY=0       # opt-in: 1
+```
+
+Uso inicial num projeto:
+```bash
+cd ~/myproject
+openspec init
+# depois, dentro de qualquer CLI agente:
+#   /opsx:propose <feature>
+#   /opsx:plan
+```
+
 ### Plugins oficiais da Anthropic (Claude only)
 
 Toggles separados pra cada plugin do marketplace `claude-plugins-official`:
diff --git a/tests/test_plugins.bats b/tests/test_plugins.bats
index 918d10e..c775511 100644
--- a/tests/test_plugins.bats
+++ b/tests/test_plugins.bats
@@ -74,6 +74,25 @@ EOF
 
 # ---------- print_manual_install_hint ----------
 
+@test "install_openspec: errors when npm missing" {
+  PATH="$STUB_DIR" run install_openspec
+  [ "$status" -ne 0 ]
+  [[ "$output" == *"npm not on PATH"* ]]
+}
+
+@test "install_openspec: invokes npm install -g with @fission-ai/openspec" {
+  CALLS_FILE="$TEST_HOME/npm-calls.txt"
+  cat > "$STUB_DIR/npm" <<EOF
+#!/usr/bin/env bash
+echo "\$*" >> "$CALLS_FILE"
+EOF
+  chmod +x "$STUB_DIR/npm"
+  # Keep /usr/bin + /bin on PATH so the stub's shebang (`env bash`) resolves.
+  PATH="$STUB_DIR:/usr/bin:/bin" run install_openspec
+  [ -f "$CALLS_FILE" ]
+  grep -q "install -g @fission-ai/openspec@latest" "$CALLS_FILE"
+}
+
 @test "print_manual_install_hint: prints CLI name and instruction" {
   run print_manual_install_hint "Codex CLI" "/plugins → search"
   [ "$status" -eq 0 ]