diff --git a/pkgs/by-name/op/openspec/package.nix b/pkgs/by-name/op/openspec/package.nix
new file mode 100644
index 000000000000..e72807f2b4c7
--- /dev/null
+++ b/pkgs/by-name/op/openspec/package.nix
@@ -0,0 +1,81 @@
+{
+  lib,
+  stdenvNoCC,
+  fetchFromGitHub,
+  nodejs_20,
+  pnpm_9,
+  fetchPnpmDeps,
+  pnpmConfigHook,
+  makeWrapper,
+  installShellFiles,
+  nix-update-script,
+}:
+
+stdenvNoCC.mkDerivation (finalAttrs: {
+  pname = "openspec";
+  version = "1.2.0";
+
+  src = fetchFromGitHub {
+    owner = "Fission-AI";
+    repo = "OpenSpec";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-DIMMOEVQ2FQj48WAF4S1IhxX5ChrFZll51CZ3bZNGHE=";
+  };
+
+  pnpmDeps = fetchPnpmDeps {
+    inherit (finalAttrs) pname version src;
+    pnpm = pnpm_9;
+    fetcherVersion = 3;
+    hash = "sha256-9s2kdvd7svK4hofnD66HkDc86WTQeayfF5y7L2dmjNg=";
+  };
+
+  nativeBuildInputs = [
+    nodejs_20
+    pnpmConfigHook
+    pnpm_9
+    makeWrapper
+    installShellFiles
+  ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    pnpm run build
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/bin $out/lib/openspec
+
+    substituteInPlace bin/openspec.js \
+      --replace '#!/usr/bin/env node' '#!${nodejs_20}/bin/node' \
+      --replace "../dist" "$out/lib/openspec/dist"
+    install -Dm755 bin/openspec.js $out/bin/openspec
+
+    cp -r dist $out/lib/openspec/
+    cp -r schemas $out/lib/openspec/
+    cp package.json $out/lib/openspec/
+    cp -r node_modules $out/lib/openspec/
+
+    runHook postInstall
+  '';
+
+  postInstall = lib.optionalString (stdenvNoCC.buildPlatform.canExecute stdenvNoCC.hostPlatform) ''
+    installShellCompletion --cmd openspec \
+      --bash <($out/bin/openspec completion generate bash) \
+      --fish <($out/bin/openspec completion generate fish) \
+      --zsh <($out/bin/openspec completion generate zsh)
+  '';
+
+  meta = {
+    description = "AI-native system for spec-driven development";
+    homepage = "https://github.com/Fission-AI/OpenSpec";
+    license = lib.licenses.mit;
+    maintainers = with lib.maintainers; [ superherointj ];
+    platforms = lib.platforms.all;
+    mainProgram = "openspec";
+  };
+})