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ZeroTian

Aseprite MCP Tools

by ZeroTian

Aseprite MCP Tools

A Python MCP server that gives AI assistants full control over Aseprite for creating pixel art and animated sprites.

104 tools across 17 categories — canvas, drawing, layers, animation, palettes, effects, slices, tilemaps, exports, visual-feedback/analysis tools, and a raw Lua escape hatch. The tool set is designed so an LLM has everything it needs to produce good pixel art, not just primitives: shading ramps with hue shifting, ordered dithering, outlines, retro palette presets with quantization, onion-skin renders, and frame diffing for animation work.

Example: a swordsman, drawn and animated by Claude

Both were created end-to-end by Claude Fable 5 through this server's MCP tools — drawing, checking its own work with scaled export_frame previews and render_onion_skin, then exporting. The tasks recreate the benchmark from Draw Me a Swordsman by Lj Miranda, whose findings inspired this server's expanded toolset.

Related MCP server: Aseprite-MCP

Tool Categories

Category

Tools

Description

Canvas

6

Create sprites, manage layers/frames, set the active state

Drawing

14

Pixels, lines, rectangles, circles, ellipses, polygons, paths, fills, gradients

Layers

7

Delete, rename, duplicate, reorder, blend modes, merge, flatten

Selection & Regions

4

Move, copy, and erase rectangular regions or colors

Effects

5

Outlines, color replacement, HSL adjustment, ordered dithering

Animation

24

Frames, cels, tags, tweening with easing, propagation

Palette

8

Get/set palettes, retro presets, color ramps, quantization, color modes

Transform

4

Flip, rotate, resize, crop

Slices

5

Named regions, 9-patch centers, pivot points

Tilemap

5

Tilemap layers, tileset editing, tile placement

Export & Import

7

PNG, GIF, sprite sheets, per-layer/per-tag export, image import

Inspection

3

Read pixels and sprite metadata

Analysis & Visual Feedback

3

Onion-skin renders, frame diffing, color statistics

Quality

4

Validate and sanitize animation consistency

Scene

1

Copy layers between sprite files

Preview & Guide

3

Local HTTP preview server, workflow guide

Scripting

1

Raw Lua escape hatch for anything not covered above

Canvas

Tool

Description

create_canvas

Create a new sprite with the given dimensions

add_layer

Add a new layer, optionally inside a named group

add_group

Add a new (optionally nested) group layer

add_frame

Append a new frame

set_frame

Set the active frame

set_frame_duration

Set one frame's duration in ms

set_layer

Set the active layer (optionally creating it)

Drawing

All _at variants target a specific layer/frame and can create the cel on demand. Coordinates are sprite-global.

Tool

Description

draw_pixels

Plot individual pixels with per-pixel colors

draw_pixels_at

Plot pixels on a specific layer/frame

draw_line / draw_line_at

Lines with thickness

draw_rectangle / draw_rectangle_at

Outlined or filled rectangles

draw_circle / draw_circle_at

Outlined or filled circles

draw_ellipse_at

Outlined or filled ellipses with separate x/y radii

draw_polygon

Outlined or filled polygons from a point list

draw_path

Polyline through a point list with thickness

fill_area / fill_area_at

Paint-bucket flood fill

apply_gradient_rect

Smooth linear gradient fill in a rectangle

Layers

Tool

Description

delete_layer

Delete a layer by name

rename_layer

Rename a layer

duplicate_layer

Duplicate a layer with all cels, opacity, and blend mode, optionally into a group

reorder_layer

Move a layer to a position in the stack

set_layer_blend_mode

Set blend mode (multiply, screen, overlay, ... 19 modes)

merge_layer_down

Merge a layer into the one below it

flatten_sprite

Flatten all layers into one

Selection & Regions

Tool

Description

move_region

Cut a rectangle of pixels and paste it elsewhere

copy_region

Copy a rectangle to another position, layer, or frame

erase_region

Make a rectangle transparent

erase_color

Magic-eraser: make all pixels of a color transparent (with tolerance)

Effects

The pixel-art toolbox: clean outlines, palette-respecting blends, and shading variants.

Tool

Description

outline_cel

Add a 1px outline around all opaque pixels

replace_color

Replace one color with another (with tolerance), preserving alpha

adjust_hsl

Shift hue/saturation/lightness of a cel — palette swaps, night scenes, shadows

apply_dither_gradient

Two-color gradient using Bayer 4×4 ordered dithering

apply_dither_pattern

Uniform dithered mix of two colors at a given density

Animation

Tool

Description

add_frames

Append N frames with optional duration

delete_frame

Delete a frame

set_frame_duration_all

Set every frame's duration

duplicate_frame_range

Duplicate a frame range N times

copy_frame / propagate_frame_to_range

Copy all cels of a frame to other frames

create_cel / clear_cel / copy_cel

Cel lifecycle on a layer/frame

propagate_cels

Copy selected layers' cels across a frame range

set_cel_position

Place a cel at x,y

set_cel_opacity

Set a single cel's opacity

offset_cel_positions

Shift cels by a delta across frames

tween_cel_positions

Linear position tween across frames

tween_cel_positions_eased

Position tween with easing (ease_in/out, smoothstep)

tween_cel_opacity_eased

Opacity tween with easing

tween_cel_scale_eased

Scale tween with easing and anchor

oscillate_cel_positions

Sine-wave motion (bobbing, breathing, hovering)

set_tag / delete_tag

Animation tags with direction (forward/reverse/pingpong)

set_layer_visibility / set_layer_opacity

Layer-level visibility and opacity

set_onion_skin

Configure onion-skin UI prefs (see render_onion_skin for batch use)

get_sprite_info

Sprite metadata: size, layers, frames, durations, tags

Palette

Tool

Description

get_palette

Read the palette as hex colors

set_palette

Set the palette from a list of hex colors

list_palette_presets

List built-in retro palettes

apply_palette_preset

Apply a preset: gameboy, pico8, c64, cga, dawnbringer16, dawnbringer32, grayscale_4, monochrome

generate_color_ramp

Build a dark→light shading ramp with hue shifting from a base color

quantize_to_palette

Snap every pixel to the nearest palette color

remap_colors_in_cel_range

Remap specific colors across a frame range

set_color_mode

Convert between RGB, grayscale, and indexed

Transform

Tool

Description

flip_layer

Flip a cel horizontally or vertically

rotate_layer

Rotate a cel 90/180/270°

resize_canvas

Scale the sprite to new dimensions

crop_canvas

Crop to a rectangle

Slices

Tool

Description

create_slice

Create a named rectangular region

set_slice_center

Set the 9-patch stretchable center

set_slice_pivot

Set the pivot point

list_slices

List all slices with bounds, centers, pivots as JSON

delete_slice

Delete a slice

Tilemap

Tool

Description

create_tilemap_layer

Add a tilemap layer with its own tileset and tile grid

draw_on_tile

Paint pixels into a tileset tile (auto-appends new tiles)

set_tiles

Place tiles on the map by grid position

get_tile_at

Read which tile occupies a grid cell

get_tilemap_info

Tile size, tile count, and map dimensions as JSON

Export & Import

Tool

Description

export_sprite

Export to PNG, GIF, JPG, ...

export_frame

Export one frame as PNG with integer upscaling — the core visual-feedback loop: draw, export at 8×, look, iterate

export_spritesheet

Sprite sheet (horizontal/vertical/rows/columns/packed) with optional JSON metadata and per-tag filtering

export_layers

One PNG per layer

export_tag

Export an animation tag as GIF or PNG sequence

import_image_as_layer

Import a PNG into a layer (references, premade parts)

copy_sprite

Duplicate the .aseprite file

Inspection

Tool

Description

get_pixel_color

Read one pixel's RGBA

get_pixels_rect

Read a rectangle of pixels as JSON

get_sprite_info

Sprite metadata (also listed under Animation)

Analysis & Visual Feedback

Batch-mode equivalents of what a human artist gets from the Aseprite UI.

Tool

Description

render_onion_skin

Render a frame over translucent ghosts of neighboring frames — check motion continuity without opening Aseprite

compare_frames

Diff two frames: changed pixel count, percentage, bounding box

get_color_stats

Color histogram of a frame — catches palette drift and near-duplicate colors

Quality

Tool

Description

ensure_layers_present

Create missing cels for layers across a frame range

validate_scene

Report missing layers/cels as JSON

audit_animation

Audit frames for overlaps and out-of-range layer activity

animation_sanitize

Normalize layer order, coverage, and overlaps

Scene

Tool

Description

copy_layers_between_sprites

Copy layers by name from one .aseprite file to another

Preview & Guide

Tool

Description

start_preview_server / stop_preview_server

Serve exported files over local HTTP

animation_workflow_guide

Returns a step-by-step workflow guide for the LLM

Scripting

Tool

Description

run_lua_script

Execute arbitrary Aseprite Lua (API docs) in batch mode. The escape hatch when no dedicated tool fits: one script can batch many operations into a single Aseprite launch. Remember to spr:saveAs(spr.filename) and print() your results. ⚠️ Runs unrestricted code on the host — only pass scripts you trust.

  1. Plan the palette first: generate_color_ramp for each material (skin, armor, blade), or apply_palette_preset for a retro look.

  2. Build in layers: background / body / equipment / effects, so parts can be animated and edited independently.

  3. Draw coarse to fine: silhouette with draw_rectangle_at / draw_ellipse_at / fill_area_at, then refine with draw_pixels_at.

  4. Look at your work: export_frame at 8×, inspect, fix, repeat. Use get_color_stats to keep the palette tight.

  5. Shade with intent: adjust_hsl for shadow layers, apply_dither_gradient for blends, outline_cel for readability.

  6. Animate with the cel tools: propagate_cels, then tween_cel_positions_eased / oscillate_cel_positions; verify with render_onion_skin and compare_frames; export with export_tag.

Docker Usage

Quick Start

Build and run the Docker image:

docker build -t aseprite-mcp:latest .
docker run -it --rm aseprite-mcp:latest

Or use the provided build scripts:

  • Linux/macOS: chmod +x build-docker.sh && ./build-docker.sh

  • Windows: .\build-docker.ps1

Using Docker Compose

# Production
docker-compose up aseprite-mcp

# Development mode
docker-compose --profile dev up aseprite-mcp-dev

See DOCKER.md for detailed Docker setup instructions.

Optional: Install Aseprite via Steam

To have the container install Aseprite via SteamCMD at startup, provide Steam credentials:

# Create a .env with STEAM_USERNAME/STEAM_PASSWORD (and optional STEAM_GUARD_CODE)
# Then
docker run --rm -i --env-file .env aseprite-mcp:latest

If installed, the binary will be at /opt/steamapps/common/Aseprite/aseprite and ASEPRITE_PATH will be picked up automatically.

Local Installation

Prerequisites

  • Python 3.13+

  • uv package manager

  • Aseprite (set ASEPRITE_PATH in .env if it is not on your PATH)

Installation:

{
  "mcpServers": {
      "aseprite": {
          "command": "/opt/homebrew/bin/uv",
          "args": [
              "--directory",
              "/path/to/repo",
              "run",
              "-m",
              "aseprite_mcp"
          ]
      }
  }
}
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A
license - permissive license
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quality
B
maintenance

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