ShaderToy-MCP

MCP Server for ShaderToy, a website for creating, running and sharing GLSL shader (https://www.shadertoy.com/). It connects LLM like Claude with ShaderToy through Model Context Protocol (MCP), allowing the LLM to query and read the entire web page, allowing it to make increasingly complex shader it normally isn't capable of.

Example of the complex shader it generates:

---

Ocean (https://www.shadertoy.com/view/tXs3Wf)

<img width="1470" alt="Screenshot 2025-04-02 at 1 58 17 AM" src="https://github.com/user-attachments/assets/40907327-111d-41eb-831e-831d36d7473a" />

---

Mountains (https://www.shadertoy.com/view/W3l3Df)

<img width="1470" alt="Screenshot 2025-04-02 at 5 44 12 PM" src="https://github.com/user-attachments/assets/16e1d078-8443-42e6-a6fe-32046a7d73a3" />

---

Matrix Digital Rain (https://www.shadertoy.com/view/33l3Df)

Features

• Retriving info on any shader on ShaderToy
• Search for shader available on ShaderToy through a search prompt
• Generate complex shaders by learning from existing shaders on ShaderToy

MCP Tools

• get_shader_info()
• search_shader()

Installation

On Mac, please install uv as

brew install uv

On Windows

powershell -c "irm https://astral.sh/uv/install.ps1 | iex" 

and then

set Path=C:\Users\nntra\.local\bin;%Path%

Otherwise installation instructions are on their website: Install uv

Claude Desktop Integration

Git clone the project with git clone https://github.com/wilsonchenghy/ShaderToy-MCP.git

Go to Claude > Settings > Developer > Edit Config > claude_desktop_config.json to include the following:

{
    "mcpServers": {
        "ShaderToy_MCP": {
          "command": "uv",
          "args": [
            "run",
            "--with",
            "mcp[cli]",
            "mcp",
            "run",
            "<path_to_project>/ShaderToy-MCP/src/ShaderToy-MCP/server.py"
          ],
          "env": {
            "SHADERTOY_APP_KEY": "your_actual_api_key"  // Replace with your API key
          }
        }
    }
}

Once the config file has been set on Claude, you will see a hammer icon for the MCP. Test with the example commands to see if it correctly utilize the MCP tools.

Example Commands

Generate shader code of a {object}, if it is based on someone's work on ShaderToy, credit it, make the code follow the ShaderToy format: void mainImage( out vec4 fragColor, in vec2 fragCoord ) {}