diff --git a/models.py b/models.py
index bf850f9..3ae5817 100644
--- a/models.py
+++ b/models.py
@@ -1,44 +1,38 @@
-"""
-Pydantic model representing a structured assignment card.
+from typing import Optional, List
+from pydantic import BaseModel
 
-Fields:
-- title: short title of the task (string)
-- subject: main topic or subject area (string, optional)
-- deadline_hint: free‑form hint about due date (string, optional)
-- deliverable_type: what is expected to be submitted (string, optional)
-- grading_hints: list of strings describing evaluation criteria (list[str], optional)
-"""
-from __future__ import annotations
+class TaskCard(BaseModel):
+    """Pydantic model representing a task card.
 
-from typing import List, Optional
+    Attributes:
+        title: The main title of the task.
+        subject: Optional subject or domain of the task.
+        deadline: Optional due date in ISO format or human readable string.
+        deliverable: Optional description of what should be produced.
+        criteria: List of acceptance criteria strings.
+    """
 
-from pydantic import BaseModel, Field
+    title: str
+    subject: Optional[str] = None
+    deadline: Optional[str] = None
+    deliverable: Optional[str] = None
+    criteria: List[str]
 
-class AssignmentCard(BaseModel):
-    """Structured representation of an informal assignment description."""
+    def to_markdown(self) -> str:
+        """Return a Markdown representation of the task card.
 
-    title: str = Field(..., description="Short title or main action of the task")
-    subject: Optional[str] = Field(None, description="Primary subject or topic of the task")
-    deadline_hint: Optional[str] = Field(
-        None,
-        description="Free‑form hint about when the task is due (e.g., 'к пятнице')",
-    )
-    deliverable_type: Optional[str] = Field(
-        None, description="What should be submitted: report, code, presentation, etc."
-    )
-    grading_hints: List[str] = Field(
-        default_factory=list,
-        description="List of evaluation criteria mentioned in the text",
-    )
-
-    class Config:
-        arbitrary_types_allowed = True
-        json_schema_extra = {
-            "example": {
-                "title": "Мини‑отчёт по LangChain",
-                "subject": "LangChain",
-                "deadline_hint": "к пятнице",
-                "deliverable_type": "отчёт",
-                "grading_hints": ["полнота", "пример кода"],
-            }
-        }
+        The format follows a simple, readable structure that can be used in
+        documentation or issue trackers.  Empty optional fields are omitted.
+        """
+        lines = [f"# {self.title}"]
+        if self.subject:
+            lines.append(f"**Subject:** {self.subject}")
+        if self.deadline:
+            lines.append(f"**Deadline:** {self.deadline}")
+        if self.deliverable:
+            lines.append(f"**Deliverable:** {self.deliverable}")
+        if self.criteria:
+            lines.append("## Acceptance Criteria")
+            for idx, crit in enumerate(self.criteria, 1):
+                lines.append(f"{idx}. {crit}")
+        return "\n\n".join(lines)