git clone https://github.com/pouyasadri/env-validator-mcp.git
cd env-validator-mcp
make build
# → bin/env-validator-mcp

{
  "mcpServers": {
    "env-validator": {
      "command": "/Users/pouyasadri/Desktop/Projects/env-validator-mcp/bin/env-validator-mcp"
    }
  }
}

{
  "results": [
    {
      "name": "go",
      "status": "ok",
      "found_version": "1.24.2",
      "expected_range": ">=1.21.0",
      "message": "go 1.24.2 is installed and satisfies >=1.21.0"
    },
    {
      "name": "docker",
      "status": "missing",
      "message": "docker is not found or not executable: executable file not found in $PATH"
    },
    {
      "name": "HOME",
      "status": "ok",
      "message": "environment variable HOME is set"
    }
  ],
  "summary": "6 OK, 2 issue(s) found",
  "ok_count": 6,
  "issue_count": 2
}

// Arguments: { "tool": "node", "constraint": ">=18.0.0" }
{
  "name": "node",
  "status": "outdated",
  "found_version": "16.0.0",
  "expected_range": ">=18.0.0",
  "message": "node 16.0.0 does not satisfy constraint >=18.0.0"
}

make build      # Compile binary to bin/
make test       # Run all tests
make test-race  # Run with race detector
make coverage   # Generate HTML coverage report
make lint       # Run golangci-lint
make clean      # Remove build artifacts

env-validator-mcp/
├── cmd/server/          # Entry point (main.go)
├── internal/
│   ├── checker/         # Tool, env, and file checkers (interfaces + implementations)
│   ├── report/          # Result and Report types
│   └── semver/          # Version extraction and constraint checking
├── mcp/                 # MCP server setup and tool handlers
├── Makefile
└── go.mod

Commander   → exec.Command (real) / MockCommander (tests)
EnvReader   → os.LookupEnv (real) / MockEnvReader (tests)
FileSystem  → os.Stat/ReadFile (real) / MockFileSystem (tests)