diff --git a/docs/guides/getting-started.md b/docs/guides/getting-started.md
index 7866b80179..9ced88565c 100644
--- a/docs/guides/getting-started.md
+++ b/docs/guides/getting-started.md
@@ -94,13 +94,13 @@ can discover user-installed skills:
   which drives the session over the OpenCode 2 HTTP API and owns the loop
   timers, so long runs survive TUI close. OpenCode 1 plugins do not run under
   OpenCode 2; see `loopx/opencode2_goal_mode/README.md`.
-- Pi: the self-contained goal extension under `.pi/extensions/loopx-goal.ts`
-  (with its loop core in `.pi/extensions/pi-goal-loop-runtime.mjs`) exposes
-  `/loopx` after restart and runs the quota-gated goal loop through
-  `loopx_goal_activate`. It is installed explicitly with
-  `loopx slash-commands --install --surface pi` (pass `--pi-project <path>`
-  to target another project from a different directory); private binding state
-  stays under each project's `.loopx/pi/` (already gitignored via `.loopx/`).
+- Pi: the self-contained goal extension exposes `/loopx` after `/reload` or a
+  restart and runs the quota-gated goal loop through `loopx_goal_activate`.
+  `loopx slash-commands --install --surface pi` installs it for the current
+  project; add `--pi-project <path>` for another project, or `--pi-scope user`
+  to install it under `~/.pi/agent/extensions/loopx/` for all projects. Only
+  extension code is global: private bindings remain under each project's
+  `.loopx/pi/` (already gitignored via `.loopx/`).
 
 The command family is the same across surfaces, even when the host-specific
 entry point is different:
diff --git a/loopx/cli_commands/slash_commands.py b/loopx/cli_commands/slash_commands.py
index 5a9604a9e9..28893d3891 100644
--- a/loopx/cli_commands/slash_commands.py
+++ b/loopx/cli_commands/slash_commands.py
@@ -122,6 +122,12 @@ def register_slash_commands_command(
         default=".",
         help="Project directory for the Pi goal extension install. Defaults to the current directory.",
     )
+    parser.add_argument(
+        "--pi-scope",
+        choices=("project", "user"),
+        default="project",
+        help="Install Pi extension code for one project or the current user. Defaults to project.",
+    )
     parser.add_argument(
         "--dry-run",
         action="store_true",
@@ -152,6 +158,7 @@ def handle_slash_commands_command(
             cursor_home=args.cursor_home,
             zcode_home=getattr(args, "zcode_home", None),
             pi_project=args.pi_project,
+            pi_scope=args.pi_scope,
         )
         print_payload(payload, output_format(args), render_slash_command_install_markdown)
         return 0 if payload.get("ok") is True else 1
diff --git a/loopx/slash_command_install.py b/loopx/slash_command_install.py
index d60b5da97e..acddc0b489 100644
--- a/loopx/slash_command_install.py
+++ b/loopx/slash_command_install.py
@@ -746,12 +746,18 @@ def _merge_cursor_mcp(cursor_root: Path, *, uninstall: bool, execute: bool) -> s
     return "written"
 
 
-def _pi_extension_path(project_root: Path) -> Path:
-    return project_root / ".pi" / "extensions" / "loopx-goal.ts"
+def _pi_extension_root(project_root: Path, *, scope: str, user_home: Path) -> Path:
+    if scope == "user":
+        return user_home / ".pi" / "agent" / "extensions" / "loopx"
+    return project_root / ".pi" / "extensions"
 
 
-def _pi_runtime_path(project_root: Path) -> Path:
-    return project_root / ".pi" / "extensions" / "pi-goal-loop-runtime.mjs"
+def _pi_extension_path(extension_root: Path) -> Path:
+    return extension_root / "loopx-goal.ts"
+
+
+def _pi_runtime_path(extension_root: Path) -> Path:
+    return extension_root / "pi-goal-loop-runtime.mjs"
 
 
 def install_slash_commands(
@@ -772,6 +778,8 @@ def install_slash_commands(
     agy_home: str | None = None,
     kiro_home: str | None = None,
     pi_project: str | None = None,
+    pi_scope: str = "project",
+    pi_user_home: str | None = None,
 ) -> dict[str, Any]:
     specs = _command_prompt_specs(cli_bin=cli_bin, include_legacy_aliases=include_legacy_aliases)
     effective_surfaces = _normalize_surfaces(surfaces)
@@ -783,7 +791,13 @@ def install_slash_commands(
     zcode_root = _zcode_home(zcode_home or zcode_agents_home)
     agy_root = _agy_home(agy_home)
     kiro_root = _kiro_home(kiro_home)
+    if pi_scope not in {"project", "user"}:
+        raise ValueError("pi_scope must be 'project' or 'user'")
     pi_project_root = Path(pi_project or ".").expanduser().resolve()
+    pi_home = Path(pi_user_home).expanduser().resolve() if pi_user_home else Path.home()
+    pi_extension_root = _pi_extension_root(
+        pi_project_root, scope=pi_scope, user_home=pi_home
+    )
     installed: list[dict[str, Any]] = []
 
     if with_goal_bridge and "opencode" not in effective_surfaces:
@@ -1295,8 +1309,8 @@ def install_slash_commands(
                 )
 
     if "pi" in effective_surfaces:
-        extension_path = _pi_extension_path(pi_project_root)
-        runtime_path = _pi_runtime_path(pi_project_root)
+        extension_path = _pi_extension_path(pi_extension_root)
+        runtime_path = _pi_runtime_path(pi_extension_root)
         extension_content = pi_extension_source()
         runtime_content = pi_runtime_source()
         if uninstall:
@@ -1395,8 +1409,9 @@ def install_slash_commands(
             "opencode_command_dir": str(opencode_root / "commands") if "opencode" in effective_surfaces else None,
             "opencode_plugin_path": str(opencode_root / "plugins" / "loopx-goal.js") if "opencode" in effective_surfaces and with_goal_bridge else None,
             "opencode_package_path": str(opencode_root / "package.json") if "opencode" in effective_surfaces and with_goal_bridge else None,
-            "pi_extension_path": str(_pi_extension_path(pi_project_root)) if "pi" in effective_surfaces else None,
-            "pi_runtime_path": str(_pi_runtime_path(pi_project_root)) if "pi" in effective_surfaces else None,
+            "pi_scope": pi_scope if "pi" in effective_surfaces else None,
+            "pi_extension_path": str(_pi_extension_path(pi_extension_root)) if "pi" in effective_surfaces else None,
+            "pi_runtime_path": str(_pi_runtime_path(pi_extension_root)) if "pi" in effective_surfaces else None,
             "status_counts": status_counts,
             "skip_policy": (
                 "Uninstall removes only LoopX-managed files; user files without a LoopX managed marker are preserved"
diff --git a/tests/test_slash_command_install.py b/tests/test_slash_command_install.py
index 0cff76939e..afd9e7f892 100644
--- a/tests/test_slash_command_install.py
+++ b/tests/test_slash_command_install.py
@@ -572,6 +572,42 @@ def test_pi_install_writes_self_contained_extension_into_project(
     assert not (tmp_path / ".pi" / "extensions" / "package.json").exists()
 
 
+def test_pi_user_scope_installs_atomic_extension_unit(tmp_path: Path) -> None:
+    home = tmp_path / "home"
+    payload = install_slash_commands(
+        execute=True,
+        surfaces=["pi"],
+        pi_scope="user",
+        pi_user_home=str(home),
+    )
+
+    root = home / ".pi" / "agent" / "extensions" / "loopx"
+    assert payload["summary"]["pi_scope"] == "user"
+    assert payload["summary"]["pi_extension_path"] == str(root / "loopx-goal.ts")
+    assert payload["summary"]["pi_runtime_path"] == str(root / "pi-goal-loop-runtime.mjs")
+    assert (root / "loopx-goal.ts").is_file()
+    assert (root / "pi-goal-loop-runtime.mjs").is_file()
+
+
+def test_pi_user_scope_preflight_blocks_both_files(tmp_path: Path) -> None:
+    home = tmp_path / "home"
+    root = home / ".pi" / "agent" / "extensions" / "loopx"
+    root.mkdir(parents=True)
+    runtime = root / "pi-goal-loop-runtime.mjs"
+    runtime.write_text("user owned\n", encoding="utf-8")
+
+    payload = install_slash_commands(
+        execute=True,
+        surfaces=["pi"],
+        pi_scope="user",
+        pi_user_home=str(home),
+    )
+
+    assert payload["ok"] is False
+    assert not (root / "loopx-goal.ts").exists()
+    assert runtime.read_text(encoding="utf-8") == "user owned\n"
+
+
 def test_pi_install_does_not_touch_default_all_surfaces(tmp_path: Path) -> None:
     payload = install_slash_commands(
         execute=True,