feat: preload CLI skills on launch (#1359)

* feat: preload CLI skills on launch

* test: cover continue with worktree and skills flags

* feat: show activated skills before CLI banner

tests/test_cli_preloaded_skills.py

@@ -0,0 +1,130 @@
+from __future__ import annotations
+
+import importlib
+import os
+import sys
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+
+def _make_real_cli(**kwargs):
+    clean_config = {
+        "model": {
+            "default": "anthropic/claude-opus-4.6",
+            "base_url": "https://openrouter.ai/api/v1",
+            "provider": "auto",
+        },
+        "display": {"compact": False, "tool_progress": "all"},
+        "agent": {},
+        "terminal": {"env_type": "local"},
+    }
+    clean_env = {"LLM_MODEL": "", "HERMES_MAX_ITERATIONS": ""}
+    prompt_toolkit_stubs = {
+        "prompt_toolkit": MagicMock(),
+        "prompt_toolkit.history": MagicMock(),
+        "prompt_toolkit.styles": MagicMock(),
+        "prompt_toolkit.patch_stdout": MagicMock(),
+        "prompt_toolkit.application": MagicMock(),
+        "prompt_toolkit.layout": MagicMock(),
+        "prompt_toolkit.layout.processors": MagicMock(),
+        "prompt_toolkit.filters": MagicMock(),
+        "prompt_toolkit.layout.dimension": MagicMock(),
+        "prompt_toolkit.layout.menus": MagicMock(),
+        "prompt_toolkit.widgets": MagicMock(),
+        "prompt_toolkit.key_binding": MagicMock(),
+        "prompt_toolkit.completion": MagicMock(),
+        "prompt_toolkit.formatted_text": MagicMock(),
+    }
+    with patch.dict(sys.modules, prompt_toolkit_stubs), patch.dict(
+        "os.environ", clean_env, clear=False
+    ):
+        import cli as cli_mod
+
+        cli_mod = importlib.reload(cli_mod)
+        with patch.object(cli_mod, "get_tool_definitions", return_value=[]), patch.dict(
+            cli_mod.__dict__, {"CLI_CONFIG": clean_config}
+        ):
+            return cli_mod.HermesCLI(**kwargs)
+
+
+class _DummyCLI:
+    def __init__(self, **kwargs):
+        self.kwargs = kwargs
+        self.session_id = "session-123"
+        self.system_prompt = "base prompt"
+        self.preloaded_skills = []
+
+    def show_banner(self):
+        return None
+
+    def show_tools(self):
+        return None
+
+    def show_toolsets(self):
+        return None
+
+    def run(self):
+        return None
+
+
+def test_main_applies_preloaded_skills_to_system_prompt(monkeypatch):
+    import cli as cli_mod
+
+    created = {}
+
+    def fake_cli(**kwargs):
+        created["cli"] = _DummyCLI(**kwargs)
+        return created["cli"]
+
+    monkeypatch.setattr(cli_mod, "HermesCLI", fake_cli)
+    monkeypatch.setattr(
+        cli_mod,
+        "build_preloaded_skills_prompt",
+        lambda skills, task_id=None: ("skill prompt", ["hermes-agent-dev", "github-auth"], []),
+    )
+
+    with pytest.raises(SystemExit):
+        cli_mod.main(skills="hermes-agent-dev,github-auth", list_tools=True)
+
+    cli_obj = created["cli"]
+    assert cli_obj.system_prompt == "base prompt\n\nskill prompt"
+    assert cli_obj.preloaded_skills == ["hermes-agent-dev", "github-auth"]
+
+
+def test_main_raises_for_unknown_preloaded_skill(monkeypatch):
+    import cli as cli_mod
+
+    monkeypatch.setattr(cli_mod, "HermesCLI", lambda **kwargs: _DummyCLI(**kwargs))
+    monkeypatch.setattr(
+        cli_mod,
+        "build_preloaded_skills_prompt",
+        lambda skills, task_id=None: ("", [], ["missing-skill"]),
+    )
+
+    with pytest.raises(ValueError, match=r"Unknown skill\(s\): missing-skill"):
+        cli_mod.main(skills="missing-skill", list_tools=True)
+
+
+def test_show_banner_prints_preloaded_skills_once_before_banner():
+    cli_obj = _make_real_cli(compact=False)
+    cli_obj.preloaded_skills = ["hermes-agent-dev", "github-auth"]
+    cli_obj.console = MagicMock()
+
+    with patch("cli.build_welcome_banner") as mock_banner, patch(
+        "shutil.get_terminal_size", return_value=os.terminal_size((120, 40))
+    ):
+        cli_obj.show_banner()
+        cli_obj.show_banner()
+
+    print_calls = [
+        call.args[0]
+        for call in cli_obj.console.print.call_args_list
+        if call.args and isinstance(call.args[0], str)
+    ]
+    startup_lines = [line for line in print_calls if "Activated skills:" in line]
+
+    assert len(startup_lines) == 1
+    assert "Activated skills:" in startup_lines[0]
+    assert "hermes-agent-dev, github-auth" in startup_lines[0]
+    assert mock_banner.call_count == 2