tool-validation

name	tool-validation
description	Behaviour harness for the 8 ASCII Canvas drawing tools. Use when changing tools, canvas interaction, border styles, or when AGENTS.md tool checklist applies.

Tool Validation Skill

Behaviour-harness methodology for the 8 drawing tools. Complements computational sensors (verify / E2E). See agents-docs/harness.md.

Verification Checklist

1. Select Tool (V)

• Selection: Dragging should show a semi-transparent blue highlight.
• Move: Clicking inside an active selection and dragging should move the content.
• Delete: Pressing Delete or Backspace while a selection is active should clear the region.

2. Rectangle Tool (R)

• Drawing: Dragging should preview a box with the current border style.
• Commit: Releasing the mouse should commit the rectangle to the grid.

3. Line Tool (L)

• Drawing: Supports horizontal, vertical, and diagonal lines.
• Direction: Should respect "Auto", "Horizontal", or "Vertical" overrides if set.

4. Arrow Tool (A)

• Head: Should draw a directional arrowhead (▲▼◄►) at the end of the line.
• Overlap: The arrowhead must not be overwritten by the line character.

5. Diamond Tool (D)

• Shape: Should draw a rhombus using diagonal lines (╱╲).
• Small Shapes: Should fallback to ◆ for single-point or very small drags.

6. Text Tool (T)

• Input: Clicking on the canvas should set a cursor.
• Typing: Alphanumeric keys should appear at the cursor.
• Controls: Enter (newline), Backspace (delete previous), and Delete (delete current) must work.

7. Freehand Tool (F)

• Style: Must use the character associated with the current Border Style (e.g., · for Single, * for ASCII).
• Interpolation: Drawing fast should still produce a continuous line.

8. Eraser Tool (E)

• Function: Should clear cells within its radius to spaces.
• Bounds: Must not emit operations outside the grid coordinates.

Automation

Use the provided Playwright scripts in e2e/tools-drawing.spec.ts for automated regression testing.