devenv

name	devenv
description	Manage development environments using devenv. Use for devenv.nix files, environment setup, dependency management.
mcp	{"devenv":{"command":["devenv","mcp"]}}

DevEnv Skill

Core Operations

• Read/modify devenv.nix configuration
• Add packages to packages = [ pkgs.package ];
• Configure languages: languages.python.enable = true;
• Enable services: services.postgres.enable = true;
• Enter shell: devenv shell

MCP Access

When skill loaded: skill_mcp(mcp_name="devenv", tool_name="...", arguments='{...}')

• Auto-connection with 5min idle timeout
• No manual setup required if opencode-lazy-loader plugin installed

Key Files

• devenv.nix - Main configuration
• devenv.yaml - Optional YAML config
• .envrc - direnv configuration
• treefmt.toml - Formatter settings

Common Commands

• devenv shell - Enter environment
• devenv build - Build environment
• task format - Format code
• task --list - Show tasks

Configuration Examples

Adding Packages

packages = [
  pkgs.nodejs
  pkgs.go
  pkgs.rustc
];

Setting Up Languages

languages.python.enable = true;
languages.nodejs.enable = true;
languages.go.enable = true;

Enabling Services

services.postgres.enable = true;
services.redis.enable = true;

Environment Variables

• Use env.VARIABLE_NAME = "value"; in devenv.nix
• Variables are available when entering the shell