V-Sekai-fire/sympy-mcp

SymPy MCP

An Elixir-based MCP (Model Context Protocol) server that provides symbolic mathematics capabilities using SymPy.

Features

• Symbolic Equation Solving: Solve algebraic equations for variables
• Expression Simplification: Simplify complex symbolic expressions
• Differentiation & Integration: Compute derivatives and integrals
• Expression Manipulation: Expand and factor algebraic expressions
• Numerical Evaluation: Evaluate expressions with variable substitutions

Quick Start

Prerequisites

• Elixir 1.18+
• OpenSSL development libraries

Note: Python 3.12 and SymPy are automatically installed during compilation.

Installation

git clone https://github.com/V-Sekai-fire/sympy-mcp.git
cd sympy-mcp
mix deps.get
mix compile

Usage

STDIO Transport (Default)

For local development:

mix mcp.server

Or using release:

./_build/prod/rel/sympy_mcp/bin/sympy_mcp start

HTTP Transport

For web deployments (e.g., Smithery):

PORT=8081 MIX_ENV=prod ./_build/prod/rel/sympy_mcp/bin/sympy_mcp start

Endpoints:

• POST / - JSON-RPC 2.0 MCP requests
• GET /sse - Server-Sent Events for streaming
• GET /health - Health check

Docker

docker build -t sympy-mcp .
docker run -d -p 8081:8081 --name sympy-mcp sympy-mcp

Available Tools

• sympy_solve - Solve equations (e.g., x**2 - 1 for x)
• sympy_simplify - Simplify expressions
• sympy_differentiate - Compute derivatives
• sympy_integrate - Compute integrals
• sympy_expand - Expand expressions
• sympy_factor - Factor expressions
• sympy_evaluate - Evaluate numerically

Example

STDIO:

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "sympy_solve",
    "arguments": {
      "equation": "x**2 - 4",
      "variable": "x"
    }
  }
}

HTTP:

curl -X POST http://localhost:8081/ \
  -H "Content-Type: application/json" \
  -H "mcp-protocol-version: 2025-06-18" \
  -d '{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": {"name": "sympy_solve", "arguments": {"equation": "x**2 - 4", "variable": "x"}}}'

Configuration

Optional MCP Configuration:

The server supports optional configuration during initialization:

• timeout_ms (integer, optional): Maximum time in milliseconds allowed for SymPy operations. If not provided, no timeout is enforced. Must be between 100 and 300000. Prevents resource exhaustion and DoS attacks.
  • Example values: 5000, 10000, 30000

Environment Variables:

• MCP_TRANSPORT - Transport type ("http" or "stdio")
• PORT - HTTP server port (default: 8081)
• HOST - HTTP server host (default: 0.0.0.0 if PORT set, else localhost)
• MIX_ENV - Environment (prod, dev, test)
• ELIXIR_ERL_OPTIONS - Erlang options (set to "+fnu" for UTF-8)

Transport Selection:

1. If MCP_TRANSPORT is set, use that transport
2. If PORT is set, use HTTP transport
3. Otherwise, use STDIO transport (default)

Troubleshooting

Python/SymPy not found: The build process installs Python 3.12 automatically. Run mix clean && mix compile if issues persist.

Port already in use: Change PORT environment variable or stop conflicting services.

Compilation errors: Run mix deps.get && mix clean && mix compile.

Debug mode: Use MIX_ENV=dev mix mcp.server for verbose logging.

License

MIT License - see LICENSE.md for details.

Contributing

See for development setup and contribution guidelines.