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blob-svg-mcp

MCP server for generating organic blob shapes as SVG.

Uses sinusoidal harmonics to produce smooth, rounded curves — no sharp corners. Every blob is reproducible via a seed parameter.

Tools

generate_blob

Generate a single blob shape as a complete SVG.

Parameter

Type

Default

Description

size

number

200

Width and height in px

complexity

number

6

Number of harmonics (2-12). More = more detailed

color

string

#6366f1

Fill color (any CSS color)

opacity

number

1

Fill opacity (0-1)

randomness

number

0.5

Radius irregularity (0 = circle, 1 = very blobby)

seed

number

random

Seed for reproducible shapes

stroke

string

Optional stroke color

stroke_width

number

2

Stroke width in px

generate_gradient_blob

Generate a blob filled with a linear gradient.

Parameter

Type

Default

Description

size

number

200

Width and height in px

complexity

number

6

Number of harmonics (2-12)

gradient_colors

string[]

["#6366f1", "#ec4899"]

Gradient stop colors

gradient_angle

number

0

Gradient angle in degrees

opacity

number

1

Fill opacity (0-1)

randomness

number

0.5

Radius irregularity (0-1)

seed

number

random

Seed for reproducible shapes

generate_blob_set

Generate multiple blobs scattered on a canvas. Useful for backgrounds and hero sections.

Parameter

Type

Default

Description

count

number

12

Number of blobs

canvas_width

number

800

Canvas width in px

canvas_height

number

600

Canvas height in px

colors

string[]

["#6366f1", "#8b5cf6", "#a78bfa", "#c4b5fd"]

Color palette

min_size

number

80

Minimum blob size in px

max_size

number

250

Maximum blob size in px

complexity

number

6

Harmonics per blob (2-12)

opacity

number

0.6

Fill opacity (0-1)

randomness

number

0.5

Radius irregularity (0-1)

seed

number

random

Seed for reproducible compositions

generate_blob_path

Generate only the SVG path data (the d attribute). Useful for embedding in your own SVG.

Parameter

Type

Default

Description

size

number

200

Coordinate space size

complexity

number

6

Number of harmonics (2-12)

randomness

number

0.5

Radius irregularity (0-1)

seed

number

random

Seed for reproducible paths

Related MCP server: SVG Canvas MCP

Setup

With Claude Code

claude mcp add blob-svg -- npx blob-svg-mcp

Manual (settings.json)

{
  "mcpServers": {
    "blob-svg": {
      "command": "npx",
      "args": ["blob-svg-mcp"]
    }
  }
}

From source

git clone https://github.com/Rixmerz/blob-svg-mcp.git
cd blob-svg-mcp
npm install
npm run build

Then point your MCP config to the built file:

{
  "mcpServers": {
    "blob-svg": {
      "command": "node",
      "args": ["/path/to/blob-svg-mcp/build/index.js"]
    }
  }
}

How it works

Each blob is generated by:

  1. Placing 36 sample points around a circle

  2. Deforming the radius at each point using summed sinusoidal harmonics (amplitude decays with frequency, so high-frequency harmonics add detail without spikes)

  3. Converting the points to a smooth closed path using Catmull-Rom to cubic Bezier conversion with tension factor 1/4

The result is always an organic, rounded shape — never angular.

License

MIT

A
license - permissive license
-
quality - not tested
D
maintenance

Maintenance

Maintainers
Response time
Release cycle
Releases (12mo)
Commit activity

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