rpg-mcp

Add, remove, or modify terrain in an active encounter. ALWAYS prefer ranges over tiles arrays for efficiency.

TERRAIN TYPES:

• obstacles: Blocking terrain (walls, rocks, fallen trees)

• difficultTerrain: Half-speed terrain (mud, rubble, underbrush)

• water: Watery terrain (streams, rivers, pools)

INPUT OPTIONS (use ranges for efficiency):

1. ranges: Array of range shortcuts (PREFERRED - saves tokens)

2. tiles: Array of "x,y" strings (only for specific scattered tiles)

RANGE SHORTCUTS (use these!):

LINES:

• "x=N" - vertical line at x=N (full height)

• "x=N:y1:y2" - vertical line segment

• "y=N" - horizontal line at y=N (full width)

• "y=N:x1:x2" - horizontal line segment

• "line:x1,y1,x2,y2" - diagonal/any line from point to point (Bresenham)

• "hline:y:x1:x2" - horizontal line

• "vline:x:y1:y2" - vertical line

• "row:N" / "col:N" - aliases for y=N / x=N

SHAPES:

• "rect:x,y,w,h" - filled rectangle

• "box:x,y,w,h" - hollow rectangle (border only)

• "border:margin" - outer border of grid (margin=0 for edge)

• "fill:x1,y1,x2,y2" - fill between two corners

• "circle:cx,cy,r" - filled circle

• "ring:cx,cy,r" - hollow circle

ALGEBRA (for curves, diagonals):

• "y=x:0:99" - diagonal line (y equals x)

• "y=2*x+5:0:50" - any linear equation

• "y=x/2:0:99" - half-speed diagonal

• "expr:EQUATION:xMin:xMax" - explicit expression format

EXAMPLES:

Maze outer walls (1 call vs 4): { "ranges": ["border:0"], "gridWidth": 100, "gridHeight": 100 }

Complex maze section: { "ranges": ["y=10:0:50", "x=25:10:40", "line:50,50,75,25", "box:60,60,15,15"] }

Diagonal river: { "terrainType": "water", "ranges": ["y=x:0:99"] }

Circular arena: { "ranges": ["ring:50,50,40", "border:0"] }