msg

2026-09-23 12:25:32 +02:00
1 parent 471a7b4fbf
commit f23109857b
@@ -0,0 +1,98 @@
+# mcp 2.x Python SDK stack
+#
+# nixpkgs pins the MCP Python SDK at 1.x, whose server class is
+# `mcp.server.fastmcp.FastMCP`. SDK 2.x renamed it to
+# `mcp.server.mcpserver.MCPServer` and dropped the old module, so packages that
+# upstream has ported to the 2.x API need their own copy of the SDK rather than
+# the nixpkgs attribute. Derivations are isolated, so this stack coexists with
+# the 1.x packages in the same repository without affecting them.
+#
+# The three pure-Python wheels below (`mcp-types`, `httpx2`, `httpcore2`) are
+# not in nixpkgs; everything else resolves from the pinned nixpkgs.
+{
+  lib,
+  pythonPackages,
+  fetchurl,
+}:
+
+let
+  ps = pythonPackages;
+
+  mk = { pname, version, url, hash, deps ? [ ] }:
+    ps.buildPythonPackage {
+      inherit pname version;
+      format = "wheel";
+      src = fetchurl { inherit url hash; };
+      propagatedBuildInputs = deps;
+      doCheck = false;
+      # Upstream floors track the latest releases, which routinely sit ahead of
+      # nixpkgs. The build is pure-Python and import-checked below, so the
+      # strict floor check is not useful here.
+      dontCheckRuntimeDeps = true;
+      pythonImportsCheck = [ (builtins.replaceStrings [ "-" ] [ "_" ] pname) ];
+      meta = with lib; {
+        description = "MCP Python SDK ${version} dependency: ${pname}";
+        homepage = "https://github.com/modelcontextprotocol/python-sdk";
+        license = licenses.mit;
+      };
+    };
+
+  mcp-types = mk {
+    pname = "mcp-types";
+    version = "2.1.1";
+    url = "https://files.pythonhosted.org/packages/71/d0/242e63c510f4a17381f55b1549a3f94f5687a0595984febd2b6f87a687a0/mcp_types-2.1.1-py3-none-any.whl";
+    hash = "sha256-Jvn38D8qVzBxeluY4qt+tkCsNS0FoAzcclwxGGR3gpU=";
+    deps = with ps; [ pydantic typing-extensions ];
+  };
+
+  httpcore2 = mk {
+    pname = "httpcore2";
+    version = "2.5.0";
+    url = "https://files.pythonhosted.org/packages/c9/a1/7564199d1a8728fe737b0a72e5b3f8d92dfe085a74ddf7cdd83bce5f206d/httpcore2-2.5.0-py3-none-any.whl";
+    hash = "sha256-XONRiN5GHTHo0AC/uO+L8ixsFlh6IR5Vcd6qXpvfhCo=";
+    deps = with ps; [ h11 truststore ];
+  };
+
+  httpx2 = mk {
+    pname = "httpx2";
+    version = "2.5.0";
+    url = "https://files.pythonhosted.org/packages/31/22/859d8252dad9bc9adee34b52e62cde621ece07b042ccb2ab4da1be46695f/httpx2-2.5.0-py3-none-any.whl";
+    hash = "sha256-PS1NnPS2HxofRqlZR8/bR+gMtWovkcYlasj1jkiR30E=";
+    deps = with ps; [
+      anyio
+      httpcore2
+      idna
+      truststore
+    ];
+  };
+in
+{
+  inherit mcp-types httpcore2 httpx2;
+
+  mcp = mk {
+    pname = "mcp";
+    version = "2.1.1";
+    url = "https://files.pythonhosted.org/packages/50/af/8644cc5fa26a59afd2df2e98eeb19e72926887fa4b7441aba4ff661140db/mcp-2.1.1-py3-none-any.whl";
+    hash = "sha256-HGwxxdZHHFjbdq86+K9n9G0R0B8KWQd9CjCMvbPT6RU=";
+    deps = with ps; [
+      anyio
+      httpx2
+      jsonschema
+      mcp-types
+      opentelemetry-api
+      pydantic
+      pyjwt
+      python-multipart
+      sse-starlette
+      starlette
+      typing-extensions
+      typing-inspection
+      uvicorn
+    ] ++ (with ps; [
+      # mcp[cli] console entry point
+      python-dotenv
+      rich
+      typer
+    ]);
+  };
+}