diff --git a/default.nix b/default.nix
new file mode 100644
index 0000000..cfffe6b
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,10 @@
+(import
+  (
+    let lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+    in fetchTarball {
+      url = "https://github.com/edolstra/flake-compat/archive/${lock.nodes.flake-compat.locked.rev}.tar.gz";
+      sha256 = lock.nodes.flake-compat.locked.narHash;
+    }
+  )
+  { src = ./.; }
+).defaultNix
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..cb9b0a4
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,78 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1767039857,
+        "narHash": "sha256-vNpUSpF5Nuw8xvDLj2KCwwksIbjua2LZCqhV1LNRDns=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "5edf11c44bc78a0d334f6334cdaf7d60d732daab",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1769900590,
+        "narHash": "sha256-I7Lmgj3owOTBGuauy9FL6qdpeK2umDoe07lM4V+PnyA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "41e216c0ca66c83b12ab7a98cc326b5db01db646",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-25.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..76a4308
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,87 @@
+{
+  description = "agentmail - Python SDK";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    flake-utils.url = "github:numtide/flake-utils";
+    flake-compat.url = "github:edolstra/flake-compat";
+    flake-compat.flake = false;
+  };
+
+  outputs = { self, nixpkgs, flake-utils, flake-compat, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        python = pkgs.python3;
+
+        agentmail = python.pkgs.buildPythonPackage {
+          pname = "agentmail";
+          version = "0.2.10";
+          format = "pyproject";
+          src = ./.;
+
+          nativeBuildInputs = [
+            python.pkgs.poetry-core
+          ];
+
+          propagatedBuildInputs = with python.pkgs; [
+            httpx
+            pydantic
+            pydantic-core
+            typing-extensions
+            websockets
+          ];
+
+          pythonImportsCheck = [ "agentmail" ];
+
+          # Tests require network access / API keys
+          doCheck = false;
+        };
+      in
+      {
+        packages.default = agentmail;
+
+        devShells.default = pkgs.mkShell {
+          packages = [
+            (python.withPackages (ps: [
+              agentmail
+              ps.pytest
+              ps.pytest-asyncio
+              ps.pytest-xdist
+              ps.python-dateutil
+              ps.mypy
+              ps.ruff
+            ]))
+          ];
+        };
+      }
+    ) // {
+      overlays.default = final: prev: {
+        pythonPackagesExtensions = (prev.pythonPackagesExtensions or []) ++ [
+          (python-final: python-prev: {
+            agentmail = python-final.buildPythonPackage {
+              pname = "agentmail";
+              version = "0.2.10";
+              format = "pyproject";
+              src = self;
+
+              nativeBuildInputs = [
+                python-final.poetry-core
+              ];
+
+              propagatedBuildInputs = with python-final; [
+                httpx
+                pydantic
+                pydantic-core
+                typing-extensions
+                websockets
+              ];
+
+              pythonImportsCheck = [ "agentmail" ];
+              doCheck = false;
+            };
+          })
+        ];
+      };
+    };
+}