diff --git a/shell_speak/models.py b/shell_speak/models.py
new file mode 100644
index 0000000..d53734f
--- /dev/null
+++ b/shell_speak/models.py
@@ -0,0 +1,47 @@
+"""Data models for shell-speak."""
+
+from dataclasses import dataclass, field
+from datetime import datetime
+from typing import Optional
+
+
+@dataclass
+class CommandPattern:
+    """A pattern for matching natural language to shell commands."""
+    name: str
+    tool: str
+    description: str
+    patterns: list[str]
+    template: str
+    explanation: str = ""
+    examples: list[str] = field(default_factory=list)
+
+
+@dataclass
+class CommandMatch:
+    """A match between natural language and a shell command."""
+    pattern: CommandPattern
+    confidence: float
+    matched_query: str
+    command: str
+    explanation: str
+
+
+@dataclass
+class HistoryEntry:
+    """An entry in the command history."""
+    query: str
+    command: str
+    tool: str
+    timestamp: datetime
+    explanation: str = ""
+
+
+@dataclass
+class Correction:
+    """A user correction for a query."""
+    original_query: str
+    corrected_command: str
+    tool: str
+    timestamp: datetime
+    explanation: str = ""