feat(mcp): add preset setup and capability mentions

tests/webui/test_settings_api.py

@@ -0,0 +1,67 @@
+from __future__ import annotations
+
+import pytest
+
+from nanobot.config.loader import load_config, save_config
+from nanobot.config.schema import Config
+from nanobot.webui.settings_api import WebUISettingsError, create_model_configuration
+
+
+def test_create_model_configuration_writes_label_and_selects(
+    tmp_path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    config_path = tmp_path / "config.json"
+    config = Config()
+    config.agents.defaults.model = "openai/gpt-4o"
+    config.agents.defaults.provider = "openai"
+    config.providers.openai.api_key = "sk-test"
+    save_config(config, config_path)
+    monkeypatch.setattr("nanobot.config.loader._current_config_path", config_path)
+
+    payload = create_model_configuration(
+        {
+            "label": ["Fast writing"],
+            "provider": ["openai"],
+            "model": ["openai/gpt-4.1-mini"],
+        }
+    )
+
+    assert payload["agent"]["model_preset"] == "fast-writing"
+    assert payload["agent"]["model"] == "openai/gpt-4.1-mini"
+    rows = {row["name"]: row for row in payload["model_presets"]}
+    assert rows["fast-writing"]["label"] == "Fast writing"
+
+    saved = load_config(config_path)
+    assert saved.agents.defaults.model_preset == "fast-writing"
+    assert saved.model_presets["fast-writing"].label == "Fast writing"
+    assert saved.model_presets["fast-writing"].model == "openai/gpt-4.1-mini"
+    assert saved.model_presets["fast-writing"].provider == "openai"
+
+    with pytest.raises(WebUISettingsError) as duplicate:
+        create_model_configuration(
+            {
+                "label": ["Fast writing"],
+                "provider": ["openai"],
+                "model": ["openai/gpt-4.1-mini"],
+            }
+        )
+    assert duplicate.value.status == 409
+
+
+def test_create_model_configuration_rejects_unconfigured_provider(
+    tmp_path,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    config_path = tmp_path / "config.json"
+    save_config(Config(), config_path)
+    monkeypatch.setattr("nanobot.config.loader._current_config_path", config_path)
+
+    with pytest.raises(WebUISettingsError, match="provider is not configured"):
+        create_model_configuration(
+            {
+                "label": ["Deep"],
+                "provider": ["openai"],
+                "model": ["openai/gpt-4.1"],
+            }
+        )