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Wassette

Wassette is an MCP server that adds messaging tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Wassette: A security-oriented runtime that runs WebAssembly Components via MCP. It has 957 GitHub stars, is released under the MIT license and runs locally with docker run -i --rm ghcr.io/microsoft/time-server-js.

github.com/microsoft/wassette (opens in a new tab)

View on GitHub (opens in a new tab)

Install Wassette

Generated from the server's published package. Replace your-value with your own values.

Claude Desktop

claude_desktop_config.json
{
  "mcpServers": {
    "wassette": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/microsoft/time-server-js"
      ]
    }
  }
}

Settings > Developer > Edit Config. macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\. Restart Claude Desktop afterwards.

Claude Code

claude mcp add --transport stdio wassette -- docker run -i --rm ghcr.io/microsoft/time-server-js

Cursor

.cursor/mcp.json
{
  "mcpServers": {
    "wassette": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/microsoft/time-server-js"
      ]
    }
  }
}

Project file; use ~/.cursor/mcp.json to enable it in every project.

VS Code

.vscode/mcp.json
{
  "servers": {
    "wassette": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/microsoft/time-server-js"
      ]
    }
  }
}

Config formats checked against the official docs on Oct 7, 2026: modelcontextprotocol.io (opens in a new tab), code.claude.com (opens in a new tab), cursor.com (opens in a new tab), code.visualstudio.com (opens in a new tab).

About Wassette

Wassette A security-oriented runtime that runs WebAssembly Components via MCP [Quick Start] | [FAQ] | [Documentation] | [Releases] | [Contributing] | [Discord]

  • capabilities
  • mcp
  • mcp-server
  • oci
  • oci-artifacts
  • permissions
  • wasm
  • wasm-component
  • wasmtime

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Still curious? Email info@appsgit.com.

What is Wassette?

Wassette is an MCP server that adds messaging tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Wassette: A security-oriented runtime that runs WebAssembly Components via MCP. It has 957 GitHub stars, is released under the MIT license and runs locally with docker run -i --rm ghcr.io/microsoft/time-server-js. The source code is at github.com/microsoft/wassette.

How do I install the Wassette MCP server?

Add the command docker run -i --rm ghcr.io/microsoft/time-server-js to your MCP client: put it in claude_desktop_config.json for Claude Desktop, run claude mcp add for Claude Code, or add it to .cursor/mcp.json (Cursor) or .vscode/mcp.json (VS Code). The snippets on this page are ready to paste.

Is Wassette free?

The server is open source under the MIT license, so running it is free. It does not declare any required API key.

Is Wassette actively maintained?

The most recent commit was on Oct 6, 2026. The latest release is v0.8.0, published Sep 29, 2026. appsgit only lists MCP servers with a commit in the last six months and re-checks every server daily.