Jacobian MCP Server

by morluto Your server? Claim it

local only

Jacobian runs on your own machine — the client starts it, so there is no endpoint to ping. 352 installs a week from npm. Last commit 17 Sep 2026.

Executable mathematics and independent verification for AI agents.

Installs per day peak 299 · avg 30 · +561% w/w

a month agotoday

352

Installs / week

npm · jacobian

192

Stars

124 open issues

17 Sep 2026

Last commit

0 releases in 90 days

MIT

License

Python

What the code does

We read the source, 20 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

File ships in the package but is absent from the source [пакет] bin/jacobian.cjs:1

этот файл ставится пользователю, но в репозитории его нет

Runs an external command npm/bin/jacobian.cjs:76, [пакет] bin/jacobian.cjs:76

  const child = spawn(

Unsafe deserialization src/jacobian/math/matrices/cyclic_linear/_kernel_process.py:73, src/jacobian/math/matrices/cyclic_linear/_kernel_worker.py:14

        response_digest, results = pickle.loads(completed.stdout)

Runs an external command tools/command_runner.py:286, src/jacobian/process.py:671

        return subprocess.Popen(

Dumps the whole environment tools/pytest_lifecycle.py:150, deploy/smoke_stdio.py:25

            environment=dict(os.environ),

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

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 jacobian -- npx -y jacobian

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

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

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

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Jacobian — questions

Answers built from our own checks of this server.

Why is there no uptime for Jacobian?

Jacobian 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 jacobian was installed 352 times last week.

How do I connect Jacobian?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It runs locally, so the command pulls jacobian straight from npm; nothing to host, nothing to sign up for.

How many people use Jacobian?

The npm package jacobian was installed 352 times in the last week. Week over week that is +561%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Jacobian open source?

Yes — it is published under the MIT licence, written in Python, 192 stars on GitHub and 124 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.