diff --git a/myagents/commands/uninstall.py b/myagents/commands/uninstall.py
index 62b3c56..a424ad8 100644
--- a/myagents/commands/uninstall.py
+++ b/myagents/commands/uninstall.py
@@ -72,7 +72,8 @@ def _pip_uninstall() -> list[str]:
 @click.command("uninstall")
 @click.option("--all", "remove_all", is_flag=True,
               help="Also remove ~/.xiaohe (runtime, settings, API keys)")
-@click.option("--yes", is_flag=True, help="Do not ask for confirmation")
+@click.option("--yes", is_flag=True,
+              help="Skip the first confirmation (--all still requires the full chain)")
 def uninstall_cmd(remove_all: bool, yes: bool) -> None:
     """Remove the xiaohe CLI layer; keeps ~/.xiaohe and the workspace."""
     home = Path.home()
@@ -97,11 +98,23 @@ def uninstall_cmd(remove_all: bool, yes: bool) -> None:
     if not yes and not click.confirm("Proceed with uninstall?", default=False, err=True):
         console.print("Cancelled.")
         return
-    if remove_all and not yes and not click.confirm(
-        "Really delete ~/.xiaohe including your API keys?", default=False, err=True
-    ):
-        console.print("Cancelled.")
-        return
+    if remove_all:
+        # Deleting ~/.xiaohe destroys settings and every saved API key —
+        # always require the full confirmation chain, even with --yes.
+        if not click.confirm(
+            "This also deletes ~/.xiaohe — runtime, settings and ALL saved API keys. "
+            "Continue?",
+            default=False,
+            err=True,
+        ):
+            console.print("Cancelled.")
+            return
+        phrase = click.prompt(
+            'Final confirmation — type "delete-all" to proceed', err=True
+        )
+        if phrase.strip() != "delete-all":
+            console.print("Cancelled (phrase did not match).")
+            return
 
     removed: list[Path] = []
 
diff --git a/myagents/commands/version.py b/myagents/commands/version.py
new file mode 100644
index 0000000..1ba369d
--- /dev/null
+++ b/myagents/commands/version.py
@@ -0,0 +1,86 @@
+"""``xiaohe version`` — show whether the CLI runs a dev checkout or an installed runtime."""
+
+import shutil
+import subprocess
+from pathlib import Path
+
+import click
+from rich.console import Console
+
+console = Console()
+
+
+def _git_describe(tree: Path) -> str:
+    try:
+        describe = subprocess.run(
+            ["git", "-C", str(tree), "describe", "--tags", "--dirty", "--always"],
+            capture_output=True, text=True, timeout=5,
+        )
+        branch = subprocess.run(
+            ["git", "-C", str(tree), "branch", "--show-current"],
+            capture_output=True, text=True, timeout=5,
+        )
+    except (OSError, subprocess.TimeoutExpired):
+        return "unknown"
+    if describe.returncode != 0:
+        return "unknown"
+    text = describe.stdout.strip()
+    name = branch.stdout.strip()
+    return f"{text} (branch {name})" if name else text
+
+
+def describe_tree(tree: Path) -> tuple[str, str]:
+    """Classify a package source tree: ('installed'|'development'|'unknown', detail)."""
+    parts = tree.parts
+    if ".xiaohe" in parts and "runtime" in parts:
+        try:
+            idx = parts.index("runtime")
+            return "installed", parts[idx + 1]
+        except (ValueError, IndexError):
+            return "installed", "unknown"
+    if (tree / ".git").exists():
+        return "development", _git_describe(tree)
+    return "unknown", ""
+
+
+def _pkg_tree(module_file: str) -> Path:
+    # <repo>/myagents/__init__.py -> <repo>
+    return Path(module_file).resolve().parents[1]
+
+
+def _report_pkg(label: str, module_file: str) -> str:
+    tree = _pkg_tree(module_file)
+    mode, detail = describe_tree(tree)
+    line = {
+        "installed": f"installed runtime [cyan]{detail}[/cyan]",
+        "development": f"[green]development checkout[/green] — {detail}",
+    }.get(mode, "unknown")
+    console.print(f"  {label}: {line}")
+    console.print(f"    [dim]{tree}[/dim]")
+    return mode
+
+
+@click.command("version")
+def version_cmd() -> None:
+    """Show which tree the CLI runs from: dev checkout or installed runtime."""
+    import myagents
+
+    bin_path = shutil.which("xiaohe") or "?"
+    console.print(f"[bold]xiaohe[/bold] (bin: {bin_path})")
+    mode = _report_pkg("myagents", myagents.__file__)
+    try:
+        import mytoolkit
+
+        _report_pkg("mytoolkit", mytoolkit.__file__)
+    except ImportError:
+        console.print("  mytoolkit: [yellow]not importable[/yellow]")
+
+    current = Path.home() / ".xiaohe" / "runtime" / "current"
+    if current.is_symlink():
+        console.print(f"runtime snapshot: [cyan]{current.resolve().name}[/cyan] [dim]({current.parent})[/dim]")
+
+    if mode == "installed":
+        console.print(
+            "\n[dim]Dev machine? Point the bins at your repo instead:[/dim]\n"
+            "  pip install -e <repo>/contrib/mytoolkit -e <repo>/contrib/myagents"
+        )
diff --git a/myagents/entrypoints.py b/myagents/entrypoints.py
index 70c4bdd..449a2b9 100644
--- a/myagents/entrypoints.py
+++ b/myagents/entrypoints.py
@@ -26,16 +26,18 @@ def default_agent() -> str:
 
 
 def build_xiaohe_cli():
-    """The ``xiaohe`` command group: agent forwarding + init/sync/upgrade/uninstall."""
+    """The ``xiaohe`` command group: agent forwarding + init/sync/upgrade/uninstall/version."""
     from myagents.commands.sync_workspace import init_cmd, sync_cmd
     from myagents.commands.uninstall import uninstall_cmd
     from myagents.commands.upgrade import upgrade_cmd
+    from myagents.commands.version import version_cmd
 
     xiaohe_cli = build_cli(default_agent(), prog_name="xiaohe", offer_install=True)
     xiaohe_cli.add_command(init_cmd)
     xiaohe_cli.add_command(sync_cmd)
     xiaohe_cli.add_command(upgrade_cmd)
     xiaohe_cli.add_command(uninstall_cmd)
+    xiaohe_cli.add_command(version_cmd)
     return xiaohe_cli
 
 
diff --git a/tests/test_uninstall.py b/tests/test_uninstall.py
index a856cf9..826b30e 100644
--- a/tests/test_uninstall.py
+++ b/tests/test_uninstall.py
@@ -53,11 +53,32 @@ class TestUninstall:
 
     def test_all_removes_xiaohe_dir(self, fake_home: Path) -> None:
         _populate(fake_home)
-        result = CliRunner().invoke(un_mod.uninstall_cmd, ["--all", "--yes"])
+        result = CliRunner().invoke(
+            un_mod.uninstall_cmd, ["--all", "--yes"], input="y\ndelete-all\n"
+        )
         assert result.exit_code == 0
         assert not (fake_home / ".xiaohe").exists()
         assert (fake_home / "workspace").is_dir()  # workspace never touched
 
+    def test_all_requires_full_chain_even_with_yes(self, fake_home: Path) -> None:
+        _populate(fake_home)
+        # --yes skips only the first gate; declining the second cancels.
+        result = CliRunner().invoke(
+            un_mod.uninstall_cmd, ["--all", "--yes"], input="n\n"
+        )
+        assert result.exit_code == 0
+        assert "Cancelled" in result.output
+        assert (fake_home / ".xiaohe").exists()
+
+    def test_all_aborts_on_wrong_phrase(self, fake_home: Path) -> None:
+        _populate(fake_home)
+        result = CliRunner().invoke(
+            un_mod.uninstall_cmd, ["--all", "--yes"], input="y\nnope\n"
+        )
+        assert result.exit_code == 0
+        assert "Cancelled" in result.output
+        assert (fake_home / ".xiaohe").exists()
+
     def test_cancelled_keeps_everything(self, fake_home: Path) -> None:
         _populate(fake_home)
         result = CliRunner().invoke(un_mod.uninstall_cmd, [], input="n\n")
diff --git a/tests/test_version.py b/tests/test_version.py
new file mode 100644
index 0000000..21be535
--- /dev/null
+++ b/tests/test_version.py
@@ -0,0 +1,48 @@
+"""Tests for myagents.commands.version."""
+
+import subprocess
+from pathlib import Path
+
+from click.testing import CliRunner
+
+from myagents.commands import version as ver_mod
+
+
+class TestDescribeTree:
+    def test_installed_runtime_tree(self) -> None:
+        tree = Path("/home/u/.xiaohe/runtime/v1.2.3/contrib/myagents")
+        mode, detail = ver_mod.describe_tree(tree)
+        assert mode == "installed"
+        assert detail == "v1.2.3"
+
+    def test_development_checkout(self, tmp_path: Path) -> None:
+        repo = tmp_path / "repo"
+        repo.mkdir()
+        (repo / ".git").mkdir()
+        mode, _ = ver_mod.describe_tree(repo)
+        assert mode == "development"
+
+    def test_unknown_tree(self, tmp_path: Path) -> None:
+        mode, _ = ver_mod.describe_tree(tmp_path)
+        assert mode == "unknown"
+
+
+class TestGitDescribe:
+    def test_describes_real_repo(self, tmp_path: Path) -> None:
+        repo = tmp_path / "repo"
+        repo.mkdir()
+        subprocess.run(["git", "init", "-q"], cwd=repo, check=True)
+        subprocess.run(
+            ["git", "-c", "user.email=t@t", "-c", "user.name=t",
+             "commit", "-q", "--allow-empty", "-m", "init"],
+            cwd=repo, check=True,
+        )
+        result = ver_mod._git_describe(repo)
+        assert "branch" in result
+
+
+class TestVersionCommand:
+    def test_runs_and_reports(self) -> None:
+        result = CliRunner().invoke(ver_mod.version_cmd)
+        assert result.exit_code == 0
+        assert "myagents" in result.output