diff --git a/README.md b/README.md
index 881aacc..66753c1 100644
--- a/README.md
+++ b/README.md
@@ -83,6 +83,10 @@ You can also run these remotely without a separate `ssh` login step:
 ssh nik-gpu "~/ba_dailies.sh mailbox"
 ```
 
+### Tab completion
+
+`setup.sh` installs bash tab-completion for the phase argument (`~/ba_dailies.sh sto<TAB>` -> `story_sweep`) automatically: it copies `completions/ba_dailies.bash` to `~/.ba_dailies_completion.bash` and adds a `source` line to `~/.bashrc` (skipped if already present, so re-running `setup.sh` doesn't duplicate it). Open a new shell (or `source ~/.bashrc`) on `nik-gpu` to pick it up. The completion list is queried live from `ba_daily.py --list-commands` rather than duplicated in the completion script, so it can't drift when a task is added or renamed.
+
 Exit code `0` means the script ran to completion without a Python exception — it does **not** by itself guarantee the in-game action succeeded. `mailbox`, `cafe`, and `stamina` all log what they actually detected and did (or why they safely aborted), so check the log output, not just the exit code.
 
 ## How to watch/verify it
diff --git a/ba_daily.py b/ba_daily.py
index f3bdb91..5eb70b4 100644
--- a/ba_daily.py
+++ b/ba_daily.py
@@ -24,6 +24,14 @@ DEFAULT_ORDER = ["mailbox", "cafe", "stamina"]
 def main(argv):
     args = argv[1:]
 
+    if args and args[0] == "--list-commands":
+        # Machine-readable command list for shell completion (see
+        # completions/ba_dailies.bash) -- kept as a thin read of TASKS
+        # itself so the completion list can never drift from what's
+        # actually dispatchable.
+        print(" ".join(TASKS.keys()))
+        return 0
+
     if not args:
         for name in DEFAULT_ORDER:
             TASKS[name](driver, config)
@@ -33,6 +41,7 @@ def main(argv):
     command = args[0]
     if command not in TASKS:
         print(f"Unknown phase: {command}", file=sys.stderr)
+        print(f"Valid phases: {' '.join(TASKS.keys())}", file=sys.stderr)
         return 1
 
     TASKS[command](driver, config)
diff --git a/completions/ba_dailies.bash b/completions/ba_dailies.bash
new file mode 100644
index 0000000..d679cc2
--- /dev/null
+++ b/completions/ba_dailies.bash
@@ -0,0 +1,30 @@
+# Bash tab-completion for ba_dailies.sh's subcommand argument.
+#
+# Installed automatically by setup.sh (copied to
+# ~/.ba_dailies_completion.bash and sourced from ~/.bashrc) -- not meant to
+# be sourced manually from the repo checkout, since it shells out to the
+# deployed ~/ba_dailies.sh, not this file's own location.
+#
+# The command list is queried from ba_daily.py itself (--list-commands)
+# rather than duplicated here, so it can never drift from the real TASKS
+# dict when a task is added, renamed, or removed.
+
+_ba_dailies_completions() {
+    local cur
+    cur="${COMP_WORDS[COMP_CWORD]}"
+
+    # Only the first argument is a phase name; ba_dailies.sh doesn't take
+    # any further positional args today.
+    if [ "$COMP_CWORD" -ne 1 ]; then
+        return 0
+    fi
+
+    local commands
+    commands="$("$HOME/ba_dailies.sh" --list-commands 2>/dev/null)"
+    COMPREPLY=($(compgen -W "$commands" -- "$cur"))
+}
+
+# Registered under every literal form CLAUDE.md documents running this as.
+complete -F _ba_dailies_completions ba_dailies.sh
+complete -F _ba_dailies_completions ./ba_dailies.sh
+complete -F _ba_dailies_completions ~/ba_dailies.sh
diff --git a/setup.sh b/setup.sh
index d082b04..7c57306 100755
--- a/setup.sh
+++ b/setup.sh
@@ -59,6 +59,17 @@ cp ba_daily.py "$HOME/ba_daily.py"
 rm -rf "$HOME/ba_auto"
 cp -r ba_auto "$HOME/ba_auto"
 
+echo "== Installing tab completion =="
+cp completions/ba_dailies.bash "$HOME/.ba_dailies_completion.bash"
+COMPLETION_LINE='source "$HOME/.ba_dailies_completion.bash"'
+if [ -f "$HOME/.bashrc" ] && ! grep -qF ".ba_dailies_completion.bash" "$HOME/.bashrc"; then
+    printf '\n# Added by ba-auto-daily setup.sh\n%s\n' "$COMPLETION_LINE" >> "$HOME/.bashrc"
+    echo "Added source line to ~/.bashrc"
+else
+    echo "~/.bashrc already sources it (or doesn't exist) -- left untouched"
+fi
+echo "Run 'source ~/.bashrc' or open a new shell to pick up completion"
+
 echo "== Done =="
 echo "Run with: ~/ba_dailies.sh [mailbox|cafe|stamina|story_sweep|shop_common|shop_tactical|lesson]"
 echo "(requires the game already running, window titled 'BlueArchive')"