diff --git a/CLAUDE.md b/CLAUDE.md
index e958146..ef10b1f 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -271,7 +271,7 @@ See PLAN.md → "Phase 8" for the full design. Summary:
   login` badge in the container list. "Valid session" today is a heuristic
   (any regular file inside `/root/.claude/`); we may refine once the
   filename layout claude writes is locked in.
-- **Login from the per-agent web UI.** Spawn `claude /login` with plain
+- **Login from the per-agent web UI.** Spawn `claude auth login` with plain
   stdio pipes (no PTY initially), surface the OAuth URL from stdout on the
   page, accept the resulting code via a paste field, write it to the process
   stdin. Once `~/.claude/` populates, the existing needs-login polling loop
diff --git a/PLAN.md b/PLAN.md
index 8aecbbb..e0f8002 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -263,7 +263,7 @@ knows where to click.
 
 **Login over the per-agent web UI.** No more `nixos-container root-login` for
 the common case. The agent's web UI exposes a "log in" action that:
-1. Spawns `claude /login` (or equivalent) inside the container with plain
+1. Spawns `claude auth login` (or equivalent) inside the container with plain
    stdio pipes — no PTY unless we discover we need one.
 2. Reads the OAuth URL from the process stdout and shows it on the page.
 3. Provides a paste field for the resulting code; writes it to the process
diff --git a/hive-ag3nt/src/bin/hive-ag3nt.rs b/hive-ag3nt/src/bin/hive-ag3nt.rs
index 17d76fa..0dd9d5c 100644
--- a/hive-ag3nt/src/bin/hive-ag3nt.rs
+++ b/hive-ag3nt/src/bin/hive-ag3nt.rs
@@ -71,7 +71,7 @@ async fn main() -> Result<()> {
                     // stays bound) but don't drive the turn loop. Poll the
                     // claude dir periodically so a successful login (whether
                     // from the dashboard PTY path in step 4 or via
-                    // `root-login` + `claude /login` in the meantime)
+                    // `root-login` + `claude auth login` in the meantime)
                     // transitions us into the turn loop without a restart.
                     needs_login_loop(&cli.socket, &claude_dir, login_state, poll_ms).await
                 }
diff --git a/hive-ag3nt/src/login.rs b/hive-ag3nt/src/login.rs
index 6f8ae69..208045b 100644
--- a/hive-ag3nt/src/login.rs
+++ b/hive-ag3nt/src/login.rs
@@ -3,7 +3,7 @@
 //! destroy/recreate so OAuth tokens survive.
 //!
 //! "Has session" today means "the dir contains at least one regular file."
-//! That's a heuristic: a fresh bind-mount starts empty, and `claude /login`
+//! That's a heuristic: a fresh bind-mount starts empty, and `claude auth login`
 //! writes credentials into the dir. We may refine later (probe for the
 //! specific credentials filename, or run a no-op `claude` call) once the
 //! exact layout is locked in.
diff --git a/hive-ag3nt/src/login_session.rs b/hive-ag3nt/src/login_session.rs
index 100b5b1..68aca36 100644
--- a/hive-ag3nt/src/login_session.rs
+++ b/hive-ag3nt/src/login_session.rs
@@ -1,4 +1,4 @@
-//! `claude /login` driver. Spawns the login command under plain stdio pipes,
+//! `claude auth login` driver. Spawns the login command under plain stdio pipes,
 //! accumulates stdout+stderr in a shared buffer (so the web UI can show
 //! whatever URL/prompt claude emits), and writes paste-back codes from the
 //! UI into the child's stdin.
@@ -16,7 +16,7 @@ use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
 use tokio::process::{Child, ChildStdin, Command};
 
 const DEFAULT_CMD: &str = "claude";
-const DEFAULT_ARGS: &[&str] = &["/login"];
+const DEFAULT_ARGS: &[&str] = &["auth", "login"];
 
 #[derive(Default)]
 struct State {
@@ -33,7 +33,7 @@ struct State {
     exit_note: Option<String>,
 }
 
-/// A running `claude /login` subprocess.
+/// A running `claude auth login` subprocess.
 pub struct LoginSession {
     child: Mutex<Child>,
     /// Tokio mutex because we hold the guard across the `write_all().await`
@@ -46,7 +46,7 @@ pub struct LoginSession {
 impl LoginSession {
     /// Spawn the login command. The exact binary/args are configurable via
     /// `HYPERHIVE_LOGIN_CMD` (single string, shell-split into argv); by
-    /// default we run `claude /login`. Failing to spawn returns an error
+    /// default we run `claude auth login`. Failing to spawn returns an error
     /// before any state is registered.
     pub fn start() -> Result<Self> {
         let (cmd, args) = resolve_command();
@@ -146,7 +146,7 @@ impl LoginSession {
 
 fn resolve_command() -> (String, Vec<String>) {
     if let Ok(raw) = std::env::var("HYPERHIVE_LOGIN_CMD") {
-        // Whitespace-only split — no quote handling. Fine for "claude /login"
+        // Whitespace-only split — no quote handling. Fine for "claude auth login"
         // style overrides; if we need anything with embedded spaces we'll
         // switch to shell-words.
         let mut parts = raw.split_whitespace().map(str::to_owned);
diff --git a/hive-ag3nt/src/web_ui.rs b/hive-ag3nt/src/web_ui.rs
index e09adb2..689e8ea 100644
--- a/hive-ag3nt/src/web_ui.rs
+++ b/hive-ag3nt/src/web_ui.rs
@@ -71,7 +71,7 @@ fn render_online() -> String {
 }
 
 fn render_needs_login_idle() -> String {
-    "<p class=\"status-needs-login\">▓█▓▒░ NEEDS L0G1N ▓█▓▒░</p>\n<p>No Claude session in <code>~/.claude/</code>. The harness is up but the turn loop is paused until you log in.</p>\n<form method=\"POST\" action=\"/login/start\">\n  <button type=\"submit\" class=\"btn btn-login\">◆ ST4RT L0G1N</button>\n</form>\n<p class=\"meta\">Spawns <code>claude /login</code> over plain stdio pipes. The OAuth URL will appear here when claude emits it; paste the resulting code back into the form below.</p>".into()
+    "<p class=\"status-needs-login\">▓█▓▒░ NEEDS L0G1N ▓█▓▒░</p>\n<p>No Claude session in <code>~/.claude/</code>. The harness is up but the turn loop is paused until you log in.</p>\n<form method=\"POST\" action=\"/login/start\">\n  <button type=\"submit\" class=\"btn btn-login\">◆ ST4RT L0G1N</button>\n</form>\n<p class=\"meta\">Spawns <code>claude auth login</code> over plain stdio pipes. The OAuth URL will appear here when claude emits it; paste the resulting code back into the form below.</p>".into()
 }
 
 fn render_login_in_progress(session: &Arc<LoginSession>) -> String {