# Jacobian (MCP server)

> Jacobian is an MCP server that adds tools to AI assistants such as Claude Desktop, Claude Code and Cursor. Executable mathematics and independent verification for AI agents. It has 203 GitHub stars, is released under the MIT license and runs locally with npx -y jacobian.

An executable mathematical vocabulary for agents: discover one typed operation, run it, and compose its result. Jacobian is an MCP server that gives AI agents a searchable vocabulary of typed mathematical operations. math.find matches a mathematical need or inspects one exact contract, and math.run executes it and returns its typed result. The same mathematical library is also available through a CLI and native Python API.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/morluto/jacobian |
| GitHub stars | 203 |
| License | MIT |
| Language | Python |
| Transport | stdio |
| Packages | npm: jacobian |
| Remote URL | none |
| Needs API key | no |
| Official | no |
| Works with | Claude Desktop, Claude Code, Cursor, VS Code |
| Category | Other |
| Latest release | jacobian-v0.23.0 (Oct 3, 2026) |
| Last commit | Oct 4, 2026 |
| MCP registry name | io.github.morluto/jacobian |

## Install

### Claude Desktop (claude_desktop_config.json)

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

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

### Claude Code

```sh
claude mcp add --transport stdio jacobian -- npx -y jacobian
```

### Cursor (.cursor/mcp.json)

```json
{
  "mcpServers": {
    "jacobian": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "jacobian"
      ]
    }
  }
}
```

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

### VS Code (.vscode/mcp.json)

```json
{
  "servers": {
    "jacobian": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "jacobian"
      ]
    }
  }
}
```

Config formats checked against the official docs on 2026-10-07.

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