fix(mcp): report static input component types

fast_dash/Components.py

@@ -1343,6 +1343,9 @@ def _get_component_from_input(hint, default_value=None):
     # Resolve typing generics (Literal, Enum, Optional, Annotated, list[str], etc.)
     resolved = _resolve_typing_hint(hint, default_value)
     if resolved.component is not None:
+        resolved.component.tag = {"Literal": "Select", "Enum": "Select"}.get(
+            resolved.component.tag, resolved.component.tag
+        )
         return resolved.component
     hint = resolved.base_type
 
@@ -1396,7 +1399,7 @@ def _get_component_from_input(hint, default_value=None):
 
         elif _default_value_type == "Sequence":
             component = Fastify(
-                dmc.Select(data=default_value), "value", tag=_hint_type
+                dmc.Select(data=default_value), "value", tag="Select"
             )
 
         elif _default_value_type == "Dictionary":
@@ -1428,12 +1431,12 @@ def _get_component_from_input(hint, default_value=None):
             component = Fastify(
                 dmc.NumberInput(value=hint(default_value)),
                 "value",
-                tag=_hint_type,
+                tag="NumberInput",
             )
 
         elif _default_value_type == "Numeric":
             component = Fastify(
-                dmc.NumberInput(value=default_value), "value", tag=_hint_type
+                dmc.NumberInput(value=default_value), "value", tag="NumberInput"
             )
 
         elif _default_value_type == "Sequence":
@@ -1445,7 +1448,7 @@ def _get_component_from_input(hint, default_value=None):
                 )
 
                 component = Fastify(
-                    dmc.Slider(min=start, max=stop, step=step), "value", tag=_hint_type
+                    dmc.Slider(min=start, max=stop, step=step), "value", tag="Slider"
                 )
 
             else:
@@ -1462,11 +1465,11 @@ def _get_component_from_input(hint, default_value=None):
                     tooltip={"placement": "bottom", "always_visible": True},
                 ),
                 "value",
-                tag=_hint_type,
+                tag="Slider",
             )
 
         else:
-            component = Fastify(dmc.NumberInput(), "value", tag=_hint_type)
+            component = Fastify(dmc.NumberInput(), "value", tag="NumberInput")
 
     elif _hint_type == "Sequence":
         if _default_value_type == "Text":
@@ -1519,11 +1522,11 @@ def _get_component_from_input(hint, default_value=None):
         # old dbc.Checkbox rendered with the Bootswatch accent (off-theme).
         if _default_value_type == "Boolean":
             component = Fastify(
-                dmc.Checkbox(checked=default_value), "checked", tag=_hint_type
+                dmc.Checkbox(checked=default_value), "checked", tag="Switch"
             )
 
         else:
-            component = Fastify(dmc.Checkbox(), "checked", tag=_hint_type)
+            component = Fastify(dmc.Checkbox(), "checked", tag="Switch")
 
     elif _hint_type == "Image":
         if _default_value_type == "Image":
@@ -1579,7 +1582,7 @@ def _get_component_from_input(hint, default_value=None):
                     style={"width": "100%"},
                 ),
                 "date",
-                tag=_hint_type,
+                tag="DateInput",
             )
 
         else:
@@ -1590,7 +1593,7 @@ def _get_component_from_input(hint, default_value=None):
                     style={"width": "100%"},
                 ),
                 "date",
-                tag=_hint_type,
+                tag="DateInput",
             )
 
     else:

tests/test_mcp.py

@@ -17,7 +17,12 @@
 import importlib.util
 import json
 import warnings
-from typing import Annotated, Optional, Tuple  # module-level for get_type_hints (#119, #132)
+from typing import (  # module-level for get_type_hints (#119, #132)
+    Annotated,
+    Literal,
+    Optional,
+    Tuple,
+)
 
 import pandas as pd  # noqa: F401  (module-level for any -> pd.DataFrame hints)
 import plotly.graph_objects as go
@@ -657,6 +662,37 @@ def style(color: str = "#1c7ed6",
         assert by_id["bio"]["tag"] == "TextArea"
         assert by_id["name"]["tag"] == "Text"
 
+    def test_static_input_tags_match_component_types(self):
+        # #158: expose component types, not internal hint names such as Numeric
+        # or Boolean, so agents can cross-reference list_component_types().
+        def form(
+            plain: str = "hi",
+            choice: str = ["a", "b"],
+            literal: Literal["x", "y"] = "x",
+            flavor: Flavor = Flavor.VANILLA,
+            count: int = 1,
+            ratio: float = 0.5,
+            enabled: bool = True,
+            day: datetime.date = datetime.date(2024, 1, 1),
+        ) -> str:
+            return plain
+
+        c = _client_for(FastDash(callback_fn=form, mcp_server=True))
+        legal = set(_call(c, "list_component_types")["types"])
+        by_id = {i["id"]: i for i in _call(c, "describe_app")["inputs"]}
+
+        assert {name: item["tag"] for name, item in by_id.items()} == {
+            "plain": "Text",
+            "choice": "Select",
+            "literal": "Select",
+            "flavor": "Select",
+            "count": "NumberInput",
+            "ratio": "NumberInput",
+            "enabled": "Switch",
+            "day": "DateInput",
+        }
+        assert {item["tag"] for item in by_id.values()} <= legal
+
     def test_password_value_goes_in_but_never_comes_back(self):
         # #151: the browser masks a PasswordInput; the unauthenticated /mcp route
         # must not undo that by reading the credential back out in plain text.