diff --git a/flake.lock b/flake.lock
index fc8e402..a8c1976 100644
--- a/flake.lock
+++ b/flake.lock
@@ -185,9 +185,30 @@
         "microvm": "microvm",
         "nixpkgs": "nixpkgs",
         "nt": "nt",
+        "sops-nix": "sops-nix",
         "systems": "systems_3"
       }
     },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1773096132,
+        "narHash": "sha256-M3zEnq9OElB7zqc+mjgPlByPm1O5t2fbUrH3t/Hm5Ag=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "d1ff3b1034d5bab5d7d8086a7803c5a5968cd784",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    },
     "spectrum": {
       "flake": false,
       "locked": {
diff --git a/snow/src/nix/mod.rs b/snow/src/nix/mod.rs
index 5f24261..35ddad3 100644
--- a/snow/src/nix/mod.rs
+++ b/snow/src/nix/mod.rs
@@ -1,7 +1,9 @@
 mod flake;
 mod flakeref;
 mod nix;
+mod primop;
 
 pub use flake::{Flake, FlakeBuilder, FlakeLockMode};
 pub use flakeref::FlakeRef;
 pub use nix::Nix;
+pub use primop::PrimOp;
diff --git a/snow/src/nix/primop.rs b/snow/src/nix/primop.rs
new file mode 100644
index 0000000..dab96b5
--- /dev/null
+++ b/snow/src/nix/primop.rs
@@ -0,0 +1,40 @@
+use std::ffi::{CStr, CString, NulError};
+
+use anyhow::Result;
+use nix_bindings_expr::{eval_state::EvalState, primop::PrimOpMeta, value::Value};
+
+pub struct PrimOp<'a, const N: usize> {
+    // pub name: &'a CStr,
+    // pub doc: &'a CStr,
+    // pub args: [&'a CStr; N],
+    meta: PrimOpMeta<'a, N>,
+    // f: Box<dyn Fn(&mut EvalState, &[Value; N]) -> Result<Value>>,
+}
+
+impl<'a, const N: usize> PrimOp<'a, N> {
+    pub fn new<S>(name: S, doc: S, args: [&'a CStr; N]) -> Result<Self>
+    where
+        S: AsRef<str>,
+    {
+        let name = CString::new(name.as_ref())?.as_ref();
+        let doc = CString::new(doc.as_ref())?.as_ref();
+        // let args = args
+        //     .iter()
+        //     .map(|x| CString::new(x.as_ref()).as_ref())
+        //     .collect::<Result<Vec<&CString>, &NulError>>()?
+        //     .iter()
+        //     .map(|x| x.as_ref())
+        //     .collect::<Vec<&CStr>>()
+        //     .as_slice();
+
+        Ok(PrimOp {
+            // name,
+            // doc,
+            // args,
+            meta: PrimOpMeta { name, doc, args },
+        })
+        // Ok(PrimOp {
+        //     meta: PrimOpMeta { name, doc, args },
+        // })
+    }
+}