RASON MCP Server

io.github.FrontlineSystems/rason-mcp-serverv2026.5.5

Build, solve, and analyze RASON optimization, simulation, data science, and decision models

Node.jsstdioofficial registry

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Install RASON MCP server

claude mcp add rason -e RASON_BEARER_TOKEN='<rason-bearer-token>' -- npx -y @frontlinesystems/rason-mcp-server

{
  "mcpServers": {
    "rason": {
      "command": "npx",
      "args": [
        "-y",
        "@frontlinesystems/rason-mcp-server"
      ],
      "env": {
        "RASON_BEARER_TOKEN": "<rason-bearer-token>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "rason": {
      "command": "npx",
      "args": [
        "-y",
        "@frontlinesystems/rason-mcp-server"
      ],
      "env": {
        "RASON_BEARER_TOKEN": "<rason-bearer-token>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "rason": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@frontlinesystems/rason-mcp-server"
      ],
      "env": {
        "RASON_BEARER_TOKEN": "<rason-bearer-token>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "rason": {
      "command": "npx",
      "args": [
        "-y",
        "@frontlinesystems/rason-mcp-server"
      ],
      "env": {
        "RASON_BEARER_TOKEN": "<rason-bearer-token>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
RASON_BEARER_TOKEN	yes	yes	RASON API bearer token. Required for model management, solving, and diagnostics. Obtain at https://rason.com/.
RASON_SERVER_URL	—	—	Base URL of the RASON REST API. /api is appended automatically.
RASON_RESULT_ARRAY_LIMIT	—	—	Maximum array/dataFrame rows before solver results are summarized.
RASON_RESULT_SIZE_LIMIT	—	—	Maximum solve-result size (in characters) before truncation.
RASON_REQUEST_TIMEOUT	—	—	HTTP request timeout in milliseconds.

Freshness

Slowing — last maintenance signal 5mo ago. The newest of the signals below sets the band.

Last commit (default branch)
no data · GitHub
Latest release
no data · GitHub
Package published
no data · npm/PyPI
Registry entry updated
2026-05-27 · 5mo ago · official registry · v2026.5.5

FAQ

›How do I install the RASON MCP server in Claude Code?

Run: claude mcp add rason -e RASON_BEARER_TOKEN='<rason-bearer-token>' -- npx -y @frontlinesystems/rason-mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does RASON require an API key?

Yes. It expects RASON_BEARER_TOKEN, of which 1 is a secret.

›Can I use RASON as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is RASON in the official MCP registry?

Yes, as io.github.FrontlineSystems/rason-mcp-server.