diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -58,7 +58,7 @@
         loader.npm=swh.loader.package.npm:register
         loader.pypi=swh.loader.package.pypi:register
         [swh.cli.subcommands]
-        loader=swh.loader.cli:run
+        loader=swh.loader.cli:loader
     ''',
     classifiers=[
         "Programming Language :: Python :: 3",
diff --git a/swh/loader/cli.py b/swh/loader/cli.py
--- a/swh/loader/cli.py
+++ b/swh/loader/cli.py
@@ -3,6 +3,7 @@
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
+import inspect
 import logging
 
 import click
@@ -48,21 +49,42 @@
     return loader_cls(**kwargs)
 
 
-@click.command(name='run', context_settings=CONTEXT_SETTINGS)
-@click.option('--type', '-t', help='Loader to run',
-              type=click.Choice(SUPPORTED_LOADERS))
-@click.option('--url', '-u', default=None,
-              help="Origin url to load")
-@click.argument('options', nargs=-1)
+@click.group(name='loader', context_settings=CONTEXT_SETTINGS)
 @click.pass_context
-def run(ctx, type, url, options):
+def loader(ctx):
     """Loader cli tools
 
-    Load an origin from its url with loader <name>
-
     """
+    pass
+
+
+@loader.command(name='run', context_settings=CONTEXT_SETTINGS)
+@click.argument('type',
+                type=click.Choice(SUPPORTED_LOADERS))
+@click.argument('url')
+@click.argument('options', nargs=-1)
+@click.pass_context
+def run(ctx, type, url, options):
+    """Ingest with loader <type> the origin located at <url>"""
     (_, kw) = parse_options(options)
     logger.debug(f'kw: {kw}')
     loader = get_loader(type, url=url, **kw)
     result = loader.load()
     click.echo(result)
+
+
+@loader.command(name='list', context_settings=CONTEXT_SETTINGS)
+@click.argument('type', default='all',
+                type=click.Choice(['all'] + SUPPORTED_LOADERS))
+@click.pass_context
+def list(ctx, type):
+    """List supported loaders and optionally their arguments"""
+    if type == 'all':
+        loaders = ', '.join(SUPPORTED_LOADERS)
+        click.echo(f'Supported loaders: {loaders}')
+    else:
+        registry_entry = LOADERS[type].load()()
+        loader_cls = registry_entry['loader']
+        doc = inspect.getdoc(loader_cls).strip()
+        signature = inspect.signature(loader_cls)
+        click.echo(f"Loader: {doc}\nsignature: {signature}")
diff --git a/swh/loader/tests/test_cli.py b/swh/loader/tests/test_cli.py
--- a/swh/loader/tests/test_cli.py
+++ b/swh/loader/tests/test_cli.py
@@ -6,7 +6,7 @@
 import pytest
 
 
-from swh.loader.cli import run, get_loader, SUPPORTED_LOADERS
+from swh.loader.cli import run, list, get_loader, SUPPORTED_LOADERS
 from swh.loader.package.loader import PackageLoader
 
 from click.testing import CliRunner
@@ -52,18 +52,13 @@
         assert isinstance(loader, PackageLoader)
 
 
-help_msg = """Usage: run [OPTIONS] [OPTIONS]...
+run_help_msg = """Usage: run [OPTIONS] [archive|debian|deposit|npm|pypi] URL [OPTIONS]...
 
-  Loader cli tools
-
-  Load an origin from its url with loader <name>
+  Ingest with loader <type> the origin located at <url>
 
 Options:
-  -t, --type [archive|debian|deposit|npm|pypi]
-                                  Loader to run
-  -u, --url TEXT                  Origin url to load
-  -h, --help                      Show this message and exit.
-"""
+  -h, --help  Show this message and exit.
+"""  # noqa
 
 
 def test_run_help(swh_config):
@@ -72,8 +67,9 @@
     """
     runner = CliRunner()
     result = runner.invoke(run, ['-h'])
+
     assert result.exit_code == 0
-    assert result.output.startswith(help_msg)
+    assert result.output.startswith(run_help_msg)
 
 
 def test_run_pypi(mocker, swh_config):
@@ -82,9 +78,25 @@
     """
     mock_loader = mocker.patch('swh.loader.package.pypi.loader.PyPILoader')
     runner = CliRunner()
-    result = runner.invoke(run, [
-        '--type', 'pypi',
-        '--url', 'https://some-url'
-    ])
+    result = runner.invoke(run, ['pypi', 'https://some-url'])
     assert result.exit_code == 0
     mock_loader.assert_called_once_with(url='https://some-url')  # constructor
+
+
+list_help_msg = """Usage: list [OPTIONS] [[all|archive|debian|deposit|npm|pypi]]
+
+  List supported loaders and optionally their arguments
+
+Options:
+  -h, --help  Show this message and exit.
+"""  # noqa
+
+
+def test_list_help(mocker, swh_config):
+    """Triggering a load should be ok
+
+    """
+    runner = CliRunner()
+    result = runner.invoke(list, ['--help'])
+    assert result.exit_code == 0
+    assert result.output.startswith(list_help_msg)