diff --git a/hermes_cli/completion.py b/hermes_cli/completion.py
new file mode 100644
index 000000000..acd7c57bf
--- /dev/null
+++ b/hermes_cli/completion.py
@@ -0,0 +1,223 @@
+"""Shell completion script generation for hermes CLI.
+
+Walks the live argparse parser tree to generate accurate, always-up-to-date
+completion scripts — no hardcoded subcommand lists, no extra dependencies.
+
+Supports bash, zsh, and fish.
+"""
+
+from __future__ import annotations
+
+import argparse
+from typing import Any
+
+
+def _walk(parser: argparse.ArgumentParser) -> dict[str, Any]:
+    """Recursively extract subcommands and flags from a parser.
+
+    Uses _SubParsersAction._choices_actions to get canonical names (no aliases)
+    along with their help text.
+    """
+    flags: list[str] = []
+    subcommands: dict[str, Any] = {}
+
+    for action in parser._actions:
+        if isinstance(action, argparse._SubParsersAction):
+            # _choices_actions has one entry per canonical name; aliases are
+            # omitted, which keeps completion lists clean.
+            seen: set[str] = set()
+            for pseudo in action._choices_actions:
+                name = pseudo.dest
+                if name in seen:
+                    continue
+                seen.add(name)
+                subparser = action.choices.get(name)
+                if subparser is None:
+                    continue
+                info = _walk(subparser)
+                info["help"] = _clean(pseudo.help or "")
+                subcommands[name] = info
+        elif action.option_strings:
+            flags.extend(o for o in action.option_strings if o.startswith("-"))
+
+    return {"flags": flags, "subcommands": subcommands}
+
+
+def _clean(text: str, maxlen: int = 60) -> str:
+    """Strip shell-unsafe characters and truncate."""
+    return text.replace("'", "").replace('"', "").replace("\\", "")[:maxlen]
+
+
+# ---------------------------------------------------------------------------
+# Bash
+# ---------------------------------------------------------------------------
+
+def generate_bash(parser: argparse.ArgumentParser) -> str:
+    tree = _walk(parser)
+    top_cmds = " ".join(sorted(tree["subcommands"]))
+
+    cases: list[str] = []
+    for cmd in sorted(tree["subcommands"]):
+        info = tree["subcommands"][cmd]
+        if info["subcommands"]:
+            subcmds = " ".join(sorted(info["subcommands"]))
+            cases.append(
+                f"        {cmd})\n"
+                f"            COMPREPLY=($(compgen -W \"{subcmds}\" -- \"$cur\"))\n"
+                f"            return\n"
+                f"            ;;"
+            )
+        elif info["flags"]:
+            flags = " ".join(info["flags"])
+            cases.append(
+                f"        {cmd})\n"
+                f"            COMPREPLY=($(compgen -W \"{flags}\" -- \"$cur\"))\n"
+                f"            return\n"
+                f"            ;;"
+            )
+
+    cases_str = "\n".join(cases)
+
+    return f"""# Hermes Agent bash completion
+# Add to ~/.bashrc:
+#   eval "$(hermes completion bash)"
+
+_hermes_completion() {{
+    local cur prev
+    COMPREPLY=()
+    cur="${{COMP_WORDS[COMP_CWORD]}}"
+    prev="${{COMP_WORDS[COMP_CWORD-1]}}"
+
+    if [[ $COMP_CWORD -ge 2 ]]; then
+        case "${{COMP_WORDS[1]}}" in
+{cases_str}
+        esac
+    fi
+
+    if [[ $COMP_CWORD -eq 1 ]]; then
+        COMPREPLY=($(compgen -W "{top_cmds}" -- "$cur"))
+    fi
+}}
+
+complete -F _hermes_completion hermes
+"""
+
+
+# ---------------------------------------------------------------------------
+# Zsh
+# ---------------------------------------------------------------------------
+
+def generate_zsh(parser: argparse.ArgumentParser) -> str:
+    tree = _walk(parser)
+
+    top_cmds_lines: list[str] = []
+    for cmd in sorted(tree["subcommands"]):
+        help_text = _clean(tree["subcommands"][cmd].get("help", ""))
+        top_cmds_lines.append(f"                '{cmd}:{help_text}'")
+    top_cmds_str = "\n".join(top_cmds_lines)
+
+    sub_cases: list[str] = []
+    for cmd in sorted(tree["subcommands"]):
+        info = tree["subcommands"][cmd]
+        if not info["subcommands"]:
+            continue
+        sub_lines: list[str] = []
+        for sc in sorted(info["subcommands"]):
+            sh = _clean(info["subcommands"][sc].get("help", ""))
+            sub_lines.append(f"                    '{sc}:{sh}'")
+        sub_str = "\n".join(sub_lines)
+        safe = cmd.replace("-", "_")
+        sub_cases.append(
+            f"                {cmd})\n"
+            f"                    local -a {safe}_cmds\n"
+            f"                    {safe}_cmds=(\n"
+            f"{sub_str}\n"
+            f"                    )\n"
+            f"                    _describe '{cmd} command' {safe}_cmds\n"
+            f"                    ;;"
+        )
+    sub_cases_str = "\n".join(sub_cases)
+
+    return f"""#compdef hermes
+# Hermes Agent zsh completion
+# Add to ~/.zshrc:
+#   eval "$(hermes completion zsh)"
+
+_hermes() {{
+    local context state line
+    typeset -A opt_args
+
+    _arguments -C \\
+        '(-h --help){{-h,--help}}[Show help and exit]' \\
+        '(-V --version){{-V,--version}}[Show version and exit]' \\
+        '1:command:->commands' \\
+        '*::arg:->args'
+
+    case $state in
+        commands)
+            local -a subcmds
+            subcmds=(
+{top_cmds_str}
+            )
+            _describe 'hermes command' subcmds
+            ;;
+        args)
+            case ${{line[1]}} in
+{sub_cases_str}
+            esac
+            ;;
+    esac
+}}
+
+_hermes "$@"
+"""
+
+
+# ---------------------------------------------------------------------------
+# Fish
+# ---------------------------------------------------------------------------
+
+def generate_fish(parser: argparse.ArgumentParser) -> str:
+    tree = _walk(parser)
+    top_cmds = sorted(tree["subcommands"])
+    top_cmds_str = " ".join(top_cmds)
+
+    lines: list[str] = [
+        "# Hermes Agent fish completion",
+        "# Add to your config:",
+        "#   hermes completion fish | source",
+        "",
+        "# Disable file completion by default",
+        "complete -c hermes -f",
+        "",
+        "# Top-level subcommands",
+    ]
+
+    for cmd in top_cmds:
+        info = tree["subcommands"][cmd]
+        help_text = _clean(info.get("help", ""))
+        lines.append(
+            f"complete -c hermes -f "
+            f"-n 'not __fish_seen_subcommand_from {top_cmds_str}' "
+            f"-a {cmd} -d '{help_text}'"
+        )
+
+    lines.append("")
+    lines.append("# Subcommand completions")
+
+    for cmd in top_cmds:
+        info = tree["subcommands"][cmd]
+        if not info["subcommands"]:
+            continue
+        lines.append(f"# {cmd}")
+        for sc in sorted(info["subcommands"]):
+            sinfo = info["subcommands"][sc]
+            sh = _clean(sinfo.get("help", ""))
+            lines.append(
+                f"complete -c hermes -f "
+                f"-n '__fish_seen_subcommand_from {cmd}' "
+                f"-a {sc} -d '{sh}'"
+            )
+
+    lines.append("")
+    return "\n".join(lines)
diff --git a/hermes_cli/main.py b/hermes_cli/main.py
index 46a7e2c5f..955ac4028 100644
--- a/hermes_cli/main.py
+++ b/hermes_cli/main.py
@@ -4124,6 +4124,8 @@ def _coalesce_session_name_args(argv: list) -> list:
         "status", "cron", "doctor", "config", "pairing", "skills", "tools",
         "mcp", "sessions", "insights", "version", "update", "uninstall",
         "profile", "dashboard",
+        "honcho", "claw", "plugins", "acp",
+        "webhook", "memory", "dump", "debug", "backup", "import", "completion", "logs",
     }
     _SESSION_FLAGS = {"-c", "--continue", "-r", "--resume"}
 
@@ -4422,14 +4424,24 @@ def cmd_dashboard(args):
     )
 
 
-def cmd_completion(args):
+def cmd_completion(args, parser=None):
     """Print shell completion script."""
-    from hermes_cli.profiles import generate_bash_completion, generate_zsh_completion
+    from hermes_cli.completion import generate_bash, generate_zsh, generate_fish
     shell = getattr(args, "shell", "bash")
-    if shell == "zsh":
-        print(generate_zsh_completion())
+    if parser is not None:
+        if shell == "zsh":
+            print(generate_zsh(parser))
+        elif shell == "fish":
+            print(generate_fish(parser))
+        else:
+            print(generate_bash(parser))
     else:
-        print(generate_bash_completion())
+        # Fallback: parser not available (e.g. called outside main())
+        from hermes_cli.profiles import generate_bash_completion, generate_zsh_completion
+        if shell == "zsh":
+            print(generate_zsh_completion())
+        else:
+            print(generate_bash_completion())
 
 
 def cmd_logs(args):
@@ -5909,13 +5921,13 @@ Examples:
     # =========================================================================
     completion_parser = subparsers.add_parser(
         "completion",
-        help="Print shell completion script (bash or zsh)",
+        help="Print shell completion script (bash, zsh, or fish)",
     )
     completion_parser.add_argument(
-        "shell", nargs="?", default="bash", choices=["bash", "zsh"],
+        "shell", nargs="?", default="bash", choices=["bash", "zsh", "fish"],
         help="Shell type (default: bash)",
     )
-    completion_parser.set_defaults(func=cmd_completion)
+    completion_parser.set_defaults(func=lambda args: cmd_completion(args, parser))
 
     # =========================================================================
     # dashboard command
diff --git a/tests/hermes_cli/test_completion.py b/tests/hermes_cli/test_completion.py
new file mode 100644
index 000000000..78a7d01c7
--- /dev/null
+++ b/tests/hermes_cli/test_completion.py
@@ -0,0 +1,189 @@
+"""Tests for hermes_cli/completion.py — shell completion script generation."""
+
+import argparse
+import os
+import re
+import shutil
+import subprocess
+import tempfile
+
+import pytest
+
+from hermes_cli.completion import _walk, generate_bash, generate_zsh, generate_fish
+
+
+# ---------------------------------------------------------------------------
+# Helpers
+# ---------------------------------------------------------------------------
+
+def _make_parser() -> argparse.ArgumentParser:
+    """Build a minimal parser that mirrors the real hermes structure."""
+    p = argparse.ArgumentParser(prog="hermes")
+    p.add_argument("--version", "-V", action="store_true")
+    sub = p.add_subparsers(dest="command")
+
+    chat = sub.add_parser("chat", help="Interactive chat with the agent")
+    chat.add_argument("-q", "--query")
+    chat.add_argument("-m", "--model")
+
+    gw = sub.add_parser("gateway", help="Messaging gateway management")
+    gw_sub = gw.add_subparsers(dest="gateway_command")
+    gw_sub.add_parser("start", help="Start service")
+    gw_sub.add_parser("stop", help="Stop service")
+    gw_sub.add_parser("status", help="Show status")
+    # alias — should NOT appear as a duplicate in completions
+    gw_sub.add_parser("run", aliases=["foreground"], help="Run in foreground")
+
+    sess = sub.add_parser("sessions", help="Manage session history")
+    sess_sub = sess.add_subparsers(dest="sessions_action")
+    sess_sub.add_parser("list", help="List sessions")
+    sess_sub.add_parser("delete", help="Delete a session")
+
+    sub.add_parser("version", help="Show version")
+
+    return p
+
+
+# ---------------------------------------------------------------------------
+# 1. Parser extraction
+# ---------------------------------------------------------------------------
+
+class TestWalk:
+    def test_top_level_subcommands_extracted(self):
+        tree = _walk(_make_parser())
+        assert set(tree["subcommands"].keys()) == {"chat", "gateway", "sessions", "version"}
+
+    def test_nested_subcommands_extracted(self):
+        tree = _walk(_make_parser())
+        gw_subs = set(tree["subcommands"]["gateway"]["subcommands"].keys())
+        assert {"start", "stop", "status", "run"}.issubset(gw_subs)
+
+    def test_aliases_not_duplicated(self):
+        """'foreground' is an alias of 'run' — must not appear as separate entry."""
+        tree = _walk(_make_parser())
+        gw_subs = tree["subcommands"]["gateway"]["subcommands"]
+        assert "foreground" not in gw_subs
+
+    def test_flags_extracted(self):
+        tree = _walk(_make_parser())
+        chat_flags = tree["subcommands"]["chat"]["flags"]
+        assert "-q" in chat_flags or "--query" in chat_flags
+
+    def test_help_text_captured(self):
+        tree = _walk(_make_parser())
+        assert tree["subcommands"]["chat"]["help"] != ""
+        assert tree["subcommands"]["gateway"]["help"] != ""
+
+
+# ---------------------------------------------------------------------------
+# 2. Bash output
+# ---------------------------------------------------------------------------
+
+class TestGenerateBash:
+    def test_contains_completion_function_and_register(self):
+        out = generate_bash(_make_parser())
+        assert "_hermes_completion()" in out
+        assert "complete -F _hermes_completion hermes" in out
+
+    def test_top_level_commands_present(self):
+        out = generate_bash(_make_parser())
+        for cmd in ("chat", "gateway", "sessions", "version"):
+            assert cmd in out
+
+    def test_nested_subcommands_in_case(self):
+        out = generate_bash(_make_parser())
+        assert "start" in out
+        assert "stop" in out
+
+    def test_valid_bash_syntax(self):
+        """Script must pass `bash -n` syntax check."""
+        out = generate_bash(_make_parser())
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".bash", delete=False) as f:
+            f.write(out)
+            path = f.name
+        try:
+            result = subprocess.run(["bash", "-n", path], capture_output=True)
+            assert result.returncode == 0, result.stderr.decode()
+        finally:
+            os.unlink(path)
+
+
+# ---------------------------------------------------------------------------
+# 3. Zsh output
+# ---------------------------------------------------------------------------
+
+class TestGenerateZsh:
+    def test_contains_compdef_header(self):
+        out = generate_zsh(_make_parser())
+        assert "#compdef hermes" in out
+
+    def test_top_level_commands_present(self):
+        out = generate_zsh(_make_parser())
+        for cmd in ("chat", "gateway", "sessions", "version"):
+            assert cmd in out
+
+    def test_nested_describe_blocks(self):
+        out = generate_zsh(_make_parser())
+        assert "_describe" in out
+        # gateway has subcommands so a _cmds array must be generated
+        assert "gateway_cmds" in out
+
+
+# ---------------------------------------------------------------------------
+# 4. Fish output
+# ---------------------------------------------------------------------------
+
+class TestGenerateFish:
+    def test_disables_file_completion(self):
+        out = generate_fish(_make_parser())
+        assert "complete -c hermes -f" in out
+
+    def test_top_level_commands_present(self):
+        out = generate_fish(_make_parser())
+        for cmd in ("chat", "gateway", "sessions", "version"):
+            assert cmd in out
+
+    def test_subcommand_guard_present(self):
+        out = generate_fish(_make_parser())
+        assert "__fish_seen_subcommand_from" in out
+
+    def test_valid_fish_syntax(self):
+        """Script must be accepted by fish without errors."""
+        if not shutil.which("fish"):
+            pytest.skip("fish not installed")
+        out = generate_fish(_make_parser())
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".fish", delete=False) as f:
+            f.write(out)
+            path = f.name
+        try:
+            result = subprocess.run(["fish", path], capture_output=True)
+            assert result.returncode == 0, result.stderr.decode()
+        finally:
+            os.unlink(path)
+
+
+# ---------------------------------------------------------------------------
+# 5. Subcommand drift prevention
+# ---------------------------------------------------------------------------
+
+class TestSubcommandDrift:
+    def test_SUBCOMMANDS_covers_required_commands(self):
+        """_SUBCOMMANDS must include all known top-level commands so that
+        multi-word session names after -c/-r are never accidentally split.
+        """
+        import inspect
+        from hermes_cli.main import _coalesce_session_name_args
+
+        source = inspect.getsource(_coalesce_session_name_args)
+        match = re.search(r'_SUBCOMMANDS\s*=\s*\{([^}]+)\}', source, re.DOTALL)
+        assert match, "_SUBCOMMANDS block not found in _coalesce_session_name_args()"
+        defined = set(re.findall(r'"(\w+)"', match.group(1)))
+
+        required = {
+            "chat", "model", "gateway", "setup", "login", "logout", "auth",
+            "status", "cron", "config", "sessions", "version", "update",
+            "uninstall", "profile", "skills", "tools", "mcp", "plugins",
+            "acp", "claw", "honcho", "completion", "logs",
+        }
+        missing = required - defined
+        assert not missing, f"Missing from _SUBCOMMANDS: {missing}"