diff --git a/CHANGELOG.md b/CHANGELOG.md
index fad6f94..d046883 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 - 💄 — Improve email and gotify notifications
 - ✨ — Add command to test gotify configuration
+- ✨ — Add nagios command to use as a Nagios probe
 
 ## 0.3.1
 
diff --git a/argos/commands.py b/argos/commands.py
index ffd69f7..31af2b9 100644
--- a/argos/commands.py
+++ b/argos/commands.py
@@ -678,5 +678,58 @@ async def test_gotify(config, domain, severity):
         )
 
 
+@server.command(short_help="Nagios compatible severities report")
+@click.option(
+    "--config",
+    default="argos-config.yaml",
+    help="Path of the configuration file. "
+    "If ARGOS_YAML_FILE environment variable is set, its value will be used instead.",
+    envvar="ARGOS_YAML_FILE",
+    callback=validate_config_access,
+)
+@coroutine
+async def nagios(config):
+    """Output a report of current severities suitable for Nagios
+    with a Nagios compatible exit code"""
+    os.environ["ARGOS_YAML_FILE"] = config
+
+    # The imports are made here otherwise the agent will need server configuration files.
+    from argos.server import queries
+
+    exit_nb = 0
+    db = await get_db()
+    severities = await queries.get_severity_counts(db)
+
+    if severities["warning"] != 0:
+        exit_nb = 1
+    if severities["critical"] != 0:
+        exit_nb = 2
+    if severities["unknown"] != 0:
+        exit_nb = 2
+
+    stats = (
+        f"ok={severities['ok']}; warning={severities['warning']}; "
+        f"critical={severities['critical']}; unknown={severities['unknown']};"
+    )
+
+    if exit_nb == 0:
+        print("OK — All sites are ok|{stats}")
+    elif exit_nb == 1:
+        print(f"WARNING — {severities['warning']} sites are in warning state|{stats}")
+    elif severities["critical"] == 0:
+        print(f"UNKNOWN — {severities['unknown']} sites are in unknown state|{stats}")
+    elif severities["unknown"] == 0:
+        print(
+            f"CRITICAL — {severities['critical']} sites are in critical state|{stats}"
+        )
+    else:
+        print(
+            f"CRITICAL/UNKNOWN — {severities['critical']} sites are in critical state "
+            f"and {severities['unknown']} sites are in unknown state|{stats}"
+        )
+
+    sysexit(exit_nb)
+
+
 if __name__ == "__main__":
     cli()
diff --git a/docs/cli.md b/docs/cli.md
index 30cb428..58b4610 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -83,6 +83,7 @@ Commands:
   generate-config  Output a self-documented example config file.
   generate-token   Generate a token for agents
   migrate          Run database migrations
+  nagios           Nagios compatible severities report
   reload-config    Load or reload tasks’ configuration
   start            Starts the server (use only for testing or development!)
   test-gotify      Send a test gotify notification
@@ -468,9 +469,33 @@ Options:
 <!--[[[end]]]
 -->
 
+#### Use as a nagios probe
+
+You can directly use Argos to get an output and an exit code usable with Nagios.
+
+<!--
+.. [[[cog
+    help(["server", "nagios", "--help"])
+.. ]]] -->
+
+```man
+Usage: argos server nagios [OPTIONS]
+
+  Output a report of current severities suitable for Nagios with a Nagios
+  compatible exit code
+
+Options:
+  --config TEXT  Path of the configuration file. If ARGOS_YAML_FILE environment
+                 variable is set, its value will be used instead.
+  --help         Show this message and exit.
+```
+
+<!--[[[end]]]
+-->
+
 #### Test the email settings
 
-You can verify that your mail settings are ok by sending a test email
+You can verify that your mail settings are ok by sending a test email.
 
 <!--
 .. [[[cog
@@ -495,7 +520,7 @@ Options:
 
 #### Test the Gotify settings
 
-You can verify that your Gotify settings are ok by sending a test notification
+You can verify that your Gotify settings are ok by sending a test notification.
 
 <!--
 .. [[[cog