Vcd

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Enables AI assistants to analyze hardware simulation VCD waveforms and GTKWave save files, providing access to signal values, bus definitions, and groupings wit

by key2

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About

Enables AI assistants to analyze hardware simulation VCD waveforms and GTKWave save files, providing access to signal values, bus definitions, and groupings without loading entire files.

README

A Model Context Protocol (MCP) server for analyzing VCD waveforms and GTKWave save files (.gtkw).

Give your AI assistant direct access to hardware simulation results — signal values, bus definitions, display formats, and signal groupings — without dumping entire files into the context window.

Tools

Tool	Description
`get-signal`	Get all value changes of a signal from a VCD file. Supports optional `start_time` / `end_time` range filtering.
`load-gtkw`	Parse a `.gtkw` save file and return its full structure: metadata, signals, buses, and groups.
`get-signal-groups`	Return the group hierarchy defined in a `.gtkw` file.
`get-bus-signals`	Return the component signals of a named bus from a `.gtkw` file.
`get-signal-with-format`	Get signal values from a VCD, formatted according to `.gtkw` display hints (hex, decimal, binary, etc.).

Installation

uv pip install mcp-vcd

Claude Desktop

Add to your claude_desktop_config.json:

"mcpServers": {
  "mcp-vcd": {
    "command": "uv",
    "args": [
      "run",
      "mcp-vcd"
    ]
  }
}

See Anthropic's MCP documentation for more info.

License

MIT

from github.com/key2/mcp-vcd

Install Vcd in Claude Desktop, Claude Code & Cursor

Recommended · one command, every IDE

unyly install mcp-vcd

Installs into Claude Desktop, Claude Code, Cursor & VS Code — handles npx, uvx and build-from-source repos for you.

First time? Get the CLI: curl -fsSL https://unyly.org/install | sh

Or configure manually

Run in your terminal:

claude mcp add mcp-vcd -- uvx mcp-vcd

FAQ

Is Vcd MCP free?

Yes, Vcd MCP is free — one-click install via Unyly at no cost.

Does Vcd need an API key?

No, Vcd runs without API keys or environment variables.

Is Vcd hosted or self-hosted?

Self-hosted: the server runs locally on your machine via the install command above.

How do I install Vcd in Claude Desktop, Claude Code or Cursor?

Open Vcd on unyly.org, pick your client tab (Claude Desktop, Claude Code, Cursor) and press Install — the config is generated automatically, no JSON editing.

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