Monty

Secure Python sandbox written in Rust for running model-generated code without Docker/VMs—millisecond sandbox create and command loops for agent code-exec.

Connects to: Pydantic, Python, npm, Rust · · MIT 8,267★

Use it with an AI agent

Loadbay is an MCP server, so an agent can search the catalog and find this harness:

claude mcp add --transport http loadbay https://loadbay.xyz/api/mcp

• Source: https://github.com/pydantic/monty
• This harness as JSON: /api/harnesses/monty
• Agent setup: /setup.md
• Browse all 850+ harnesses on Loadbay