{ lib, stdenv, buildPythonPackage, fetchFromGitHub, writableTmpDirAsHomeHook, # build-system hatchling, # dependencies authlib, cyclopts, exceptiongroup, httpx, mcp, openapi-pydantic, pydantic, pyperclip, python-dotenv, rich, # tests dirty-equals, email-validator, fastapi, pytest-asyncio, pytest-httpx, pytestCheckHook, }: buildPythonPackage rec { pname = "fastmcp"; version = "2.11.1"; pyproject = true; src = fetchFromGitHub { owner = "jlowin"; repo = "fastmcp"; tag = "v${version}"; hash = "sha256-Y71AJdWcRBDbq63p+lcQplqutz2UTQ3f+pTyhcolpuw="; }; postPatch = '' substituteInPlace pyproject.toml \ --replace-fail ', "uv-dynamic-versioning>=0.7.0"' "" \ --replace-fail 'dynamic = ["version"]' 'version = "${version}"' ''; build-system = [ hatchling ]; dependencies = [ authlib cyclopts exceptiongroup httpx mcp openapi-pydantic pyperclip python-dotenv rich ]; pythonImportsCheck = [ "fastmcp" ]; nativeCheckInputs = [ dirty-equals email-validator fastapi pydantic pytest-asyncio pytest-httpx pytestCheckHook writableTmpDirAsHomeHook ] ++ pydantic.optional-dependencies.email; disabledTests = [ # AssertionError: assert 'INFO' == 'DEBUG' "test_temporary_settings" # RuntimeError: Client failed to connect: Connection close "test_keep_alive_maintains_session_across_multiple_calls" "test_keep_alive_false_starts_new_session_across_multiple_calls" "test_keep_alive_starts_new_session_if_manually_closed" "test_keep_alive_maintains_session_if_reentered" "test_close_session_and_try_to_use_client_raises_error" # RuntimeError: Client failed to connect: Timed out while waiting for response "test_timeout" "test_timeout_tool_call_overrides_client_timeout_even_if_lower" # assert 0 == 2 "test_multi_client" # fastmcp.exceptions.ToolError: Unknown tool "test_multi_client_with_logging" "test_multi_client_with_elicitation" ]; disabledTestPaths = lib.optionals stdenv.hostPlatform.isDarwin [ # RuntimeError: Server failed to start after 10 attempts "tests/auth/providers/test_bearer.py" "tests/auth/test_oauth_client.py" "tests/client/test_openapi.py" "tests/client/test_sse.py" "tests/client/test_streamable_http.py" "tests/server/http/test_http_dependencies.py" "tests/server/http/test_http_dependencies.py" ]; __darwinAllowLocalNetworking = true; meta = { description = "Fast, Pythonic way to build MCP servers and clients"; changelog = "https://github.com/jlowin/fastmcp/releases/tag/${src.tag}"; homepage = "https://github.com/jlowin/fastmcp"; license = lib.licenses.asl20; maintainers = with lib.maintainers; [ GaetanLepage ]; }; }