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+# Entity Creation Tools (13)
+
+All creation tools return `{handle, type, layer, color, linetype, visible, properties}`. The `handle` (hex string) is required for all subsequent operations on that entity.
+
+Common optional params on all creation tools:
+
+| Param | Type | Default | Description |
+|-------|------|---------|-------------|
+| `layer` | `str` | Current layer | Target layer name |
+| `color` | `int` | 256 (ByLayer) | ACI color (1-255, 256=ByLayer, 0=ByBlock) |
+| `linetype` | `str` | `"ByLayer"` | Linetype name |
+
+---
+
+## entity_create_line
+| Param | Type | Description |
+|-------|------|-------------|
+| `x1, y1` | `float` | Start point |
+| `x2, y2` | `float` | End point |
+
+## entity_create_circle
+| Param | Type | Description |
+|-------|------|-------------|
+| `cx, cy` | `float` | Center point |
+| `radius` | `float` | Radius |
+
+## entity_create_arc
+| Param | Type | Description |
+|-------|------|-------------|
+| `cx, cy` | `float` | Center point |
+| `radius` | `float` | Radius |
+| `start_angle` | `float` | Start angle (degrees, CCW from X) |
+| `end_angle` | `float` | End angle (degrees) |
+
+## entity_create_polyline
+| Param | Type | Description |
+|-------|------|-------------|
+| `points` | `list[list[float]]` | `[[x,y], [x,y], ...]` coordinate pairs |
+| `closed` | `bool` | Close the polyline (default: false) |
+
+## entity_create_rectangle
+| Param | Type | Description |
+|-------|------|-------------|
+| `x1, y1` | `float` | First corner |
+| `x2, y2` | `float` | Opposite corner |
+
+Creates an LWPOLYLINE (closed).
+
+## entity_create_text
+| Param | Type | Description |
+|-------|------|-------------|
+| `text` | `str` | Text content |
+| `x, y` | `float` | Insertion point |
+| `height` | `float` | Text height (default: 2.5) |
+| `rotation` | `float` | Rotation angle in degrees (default: 0) |
+
+## entity_create_mtext
+| Param | Type | Description |
+|-------|------|-------------|
+| `text` | `str` | Content (`\P` for paragraph break, `{\H...;}` for formatting) |
+| `x, y` | `float` | Insertion point |
+| `width` | `float` | Text box width (default: 100) |
+| `height` | `float` | Character height (default: 2.5) |
+
+## entity_create_hatch
+| Param | Type | Description |
+|-------|------|-------------|
+| `pattern` | `str` | Pattern name: `SOLID`, `ANSI31`, `ANSI32`, `STEEL`, `GRAVEL`, etc. |
+| `boundary_points` | `list[list[float]]` | Closed boundary polygon `[[x,y], ...]` |
+| `scale` | `float` | Pattern scale (default: 1.0) |
+| `angle` | `float` | Pattern angle (default: 0) |
+
+## entity_create_spline
+| Param | Type | Description |
+|-------|------|-------------|
+| `fit_points` | `list[list[float]]` | Points the spline passes through |
+
+## entity_create_ellipse
+| Param | Type | Description |
+|-------|------|-------------|
+| `cx, cy` | `float` | Center point |
+| `major_axis_x, major_axis_y` | `float` | Major axis endpoint (relative to center) |
+| `ratio` | `float` | Minor/major axis ratio (0.0–1.0) |
+
+## entity_create_point
+| Param | Type | Description |
+|-------|------|-------------|
+| `x, y` | `float` | Point coordinates |
+
+## entity_create_block_ref
+| Param | Type | Description |
+|-------|------|-------------|
+| `name` | `str` | Block definition name (must exist) |
+| `x, y` | `float` | Insertion point |
+| `x_scale, y_scale` | `float` | Scale factors (default: 1.0) |
+| `rotation` | `float` | Rotation in degrees (default: 0) |