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+"""
+models.py
+=========
+
+This module defines the :class:`TaskCard` Pydantic model that represents a
+structured representation of an informal task description.
+
+The fields are intentionally simple but expressive enough for the unit tests
+and examples in ``main.py``:
+
+* ``title`` – short human‑readable title.
+* ``subject`` – subject area or domain.
+* ``deadline_hint`` – free‑form hint about when the task should be finished.
+* ``deliverable_type`` – what is expected to be submitted (report, code,
+  presentation, etc.).
+* ``grading_hints`` – list of strings that were mentioned in the original
+  text as criteria for grading.
+
+The model uses :class:`pydantic.Field` to provide helpful descriptions and
+default values.  The ``__str__`` method is overridden so that printing a
+model instance gives a nicely formatted summary.
+"""
+
+from __future__ import annotations
+
+from typing import List, Optional
+
+from pydantic import BaseModel, Field
+
+
+class TaskCard(BaseModel):
+    """Pydantic model for a parsed task card.
+
+    The fields are intentionally minimal but cover all information that the
+    assignment expects to be extracted from an informal description.
+    """
+
+    title: str = Field(
+        ...,
+        description="Short human‑readable title of the task.",
+    )
+    subject: Optional[str] = Field(
+        None,
+        description="Subject or domain mentioned in the text (e.g. LangChain).",
+    )
+    deadline_hint: Optional[str] = Field(
+        None,
+        description="Free‑form hint about when the task should be finished.",
+    )
+    deliverable_type: Optional[str] = Field(
+        None,
+        description="What is expected to be submitted (report, code, presentation).",
+    )
+    grading_hints: List[str] = Field(
+        default_factory=list,
+        description="List of strings that were mentioned as grading criteria.",
+    )
+
+    def __str__(self) -> str:
+        """Return a human‑readable summary of the card."""
+        parts = [f"Title: {self.title}"]
+        if self.subject:
+            parts.append(f"Subject: {self.subject}")
+        if self.deadline_hint:
+            parts.append(f"Deadline hint: {self.deadline_hint}")
+        if self.deliverable_type:
+            parts.append(f"Deliverable type: {self.deliverable_type}")
+        if self.grading_hints:
+            parts.append(
+                "Grading hints: " + ", ".join(self.grading_hints)
+            )
+        return "\n".join(parts)
+
+    class Config:
+        # Allow arbitrary types for future extensions.
+        arbitrary_types_allowed = True
+
+# End of models.py