devenv

Fast, declarative developer environments built on Nix, with a built-in MCP server that lets agents search packages and options. Agents can provision isolated dev stacks for any language with sub-100ms activation.

Connects to: Nix, PostgreSQL, Redis, MongoDB, Claude, VS Code · · Apache-2.0 7,568★

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/cachix/devenv
• This harness as JSON: /api/harnesses/devenv
• Agent setup: /setup.md
• Browse all 700+ harnesses on Loadbay