Anvil MCP Server

by the-warl0ck Your server? Claim it

local only

Anvil runs on your own machine — the client starts it, so there is no endpoint to ping. 72 installs a week from npm. Last commit 28 Sep 2026.

Local physics/chemistry bench as MCP: plain words in, 12-domain simulations out.

Installs per day peak 665 · avg 43 · -28% w/w

a month agotoday

Installs / week

npm · anvil-mcp

Stars

0 open issues

28 Sep 2026

Last commit

7 releases in 90 days

Apache-2.0

License

TypeScript

Nothing serious here today

Today is the operative word: we check Anvil every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add anvil-mcp -- npx -y anvil-mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "anvil-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "anvil-mcp"
      ]
    }
  }
}

~/.codex/config.toml

[mcp_servers.anvil-mcp]
command = "npx"
args = ["-y", "anvil-mcp"]

.cursor/mcp.json

{
  "mcpServers": {
    "anvil-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "anvil-mcp"
      ]
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "anvil-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "anvil-mcp"
      ]
    }
  }
}

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Anvil — questions

Answers built from our own checks of this server.

Why is there no uptime for Anvil?

Anvil runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package anvil-mcp was installed 72 times last week.

How do I connect Anvil?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls anvil-mcp straight from npm; nothing to host, nothing to sign up for.

How many people use Anvil?

The npm package anvil-mcp was installed 72 times in the last week. Week over week that is -28%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Anvil open source?

Yes — it is published under the Apache-2.0 licence, written in TypeScript and 1 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.