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The official Python SDK for Model Context Protocol servers and clients

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[project]
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name = "mcp"
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dynamic = ["version"]
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description = "Model Context Protocol SDK"
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readme = "README.md"
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requires-python = ">=3.10"
authors = [{ name = "Model Context Protocol a Series of LF Projects, LLC." }]
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maintainers = [
{ name = "David Soria Parra", email = "davidsp@anthropic.com" },
{ name = "Marcelo Trylesinski", email = "marcelotryle@gmail.com" },
{ name = "Max Isbey", email = "maxisbey@anthropic.com" },
{ name = "Felix Weinberger", email = "fweinberger@anthropic.com" },
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]
keywords = ["git", "mcp", "llm", "automation"]
license = { text = "MIT" }
classifiers = [
"Development Status :: 4 - Beta",
"Intended Audience :: Developers",
"License :: OSI Approved :: MIT License",
"Programming Language :: Python :: 3",
"Programming Language :: Python :: 3.10",
"Programming Language :: Python :: 3.11",
"Programming Language :: Python :: 3.12",
"Programming Language :: Python :: 3.13",
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"Programming Language :: Python :: 3.14",
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]
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dependencies = [
"anyio>=4.9",
"httpx>=0.27.1,<1.0.0",
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"httpx-sse>=0.4",
"pydantic>=2.12.0",
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"starlette>=0.48.0; python_version >= '3.14'",
"starlette>=0.27; python_version < '3.14'",
"python-multipart>=0.0.9",
"sse-starlette>=3.0.0",
"pydantic-settings>=2.5.2",
"uvicorn>=0.31.1; sys_platform != 'emscripten'",
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"jsonschema>=4.20.0",
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"pywin32>=311; sys_platform == 'win32'",
"pyjwt[crypto]>=2.10.1",
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"typing-extensions>=4.13.0",
"typing-inspection>=0.4.1",
"opentelemetry-api>=1.28.0",
]
[project.optional-dependencies]
rich = ["rich>=13.9.4"]
cli = ["typer>=0.16.0", "python-dotenv>=1.0.0"]
ws = ["websockets>=15.0.1"]
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[project.scripts]
mcp = "mcp.cli:app [cli]"
[tool.uv]
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default-groups = ["dev", "docs"]
required-version = ">=0.9.5"
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[dependency-groups]
dev = [
# We add mcp[cli,ws] so `uv sync` considers the extras.
"mcp[cli,ws]",
"pyright>=1.1.400",
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"pytest>=8.3.4",
"ruff>=0.8.5",
"trio>=0.26.2",
"pytest-flakefinder>=1.1.0",
"pytest-xdist>=3.6.1",
"pytest-examples>=0.0.14",
"pytest-pretty>=1.2.0",
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"inline-snapshot>=0.23.0",
"dirty-equals>=0.9.0",
"coverage[toml]>=7.10.7,<=7.13",
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"pillow>=12.0",
"strict-no-cover",
"logfire>=3.0.0",
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]
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docs = [
"mkdocs>=1.6.1",
"mkdocs-gen-files>=0.5.0",
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"mkdocs-glightbox>=0.4.0",
"mkdocs-literate-nav>=0.6.1",
"mkdocs-material[imaging]>=9.5.45",
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"mkdocstrings-python>=2.0.1",
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]
[build-system]
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requires = ["hatchling", "uv-dynamic-versioning"]
build-backend = "hatchling.build"
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[tool.hatch.version]
source = "uv-dynamic-versioning"
[tool.uv-dynamic-versioning]
vcs = "git"
style = "pep440"
bump = true
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[project.urls]
Homepage = "https://modelcontextprotocol.io"
Repository = "https://github.com/modelcontextprotocol/python-sdk"
Issues = "https://github.com/modelcontextprotocol/python-sdk/issues"
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[tool.hatch.build.targets.wheel]
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packages = ["src/mcp"]
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[tool.pyright]
typeCheckingMode = "strict"
include = [
"src/mcp",
"tests",
"examples/servers",
"examples/snippets",
"examples/clients",
]
venvPath = "."
venv = ".venv"
# The FastAPI style of using decorators in tests gives a `reportUnusedFunction` error.
# See https://github.com/microsoft/pyright/issues/7771 for more details.
# TODO(Marcelo): We should remove `reportPrivateUsage = false`. The idea is that we should test the workflow that uses
# those private functions instead of testing the private functions directly. It makes it easier to maintain the code source
# and refactor code that is not public.
executionEnvironments = [
{ root = "tests", extraPaths = [
".",
], reportUnusedFunction = false, reportPrivateUsage = false },
{ root = "examples/servers", reportUnusedFunction = false },
]
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[tool.ruff]
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line-length = 120
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target-version = "py310"
extend-exclude = ["README.md", "README.v2.md"]
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[tool.ruff.lint]
select = [
"C4", # flake8-comprehensions
"C90", # mccabe
"D212", # pydocstyle: multi-line docstring summary should start at the first line
"E", # pycodestyle
"F", # pyflakes
"I", # isort
"PERF", # Perflint
"UP", # pyupgrade
"TID251", # https://docs.astral.sh/ruff/rules/banned-api/
]
ignore = ["PERF203"]
[tool.ruff.lint.flake8-tidy-imports.banned-api]
"pydantic.RootModel".msg = "Use `pydantic.TypeAdapter` instead."
[tool.ruff.lint.mccabe]
max-complexity = 24 # Default is 10
[tool.ruff.lint.per-file-ignores]
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"__init__.py" = ["F401"]
"tests/server/mcpserver/test_func_metadata.py" = ["E501"]
"tests/shared/test_progress_notifications.py" = ["PLW0603"]
[tool.ruff.lint.pylint]
allow-magic-value-types = ["bytes", "float", "int", "str"]
max-args = 23 # Default is 5
max-branches = 23 # Default is 12
max-returns = 13 # Default is 6
max-statements = 102 # Default is 50
[tool.uv.workspace]
members = ["examples/clients/*", "examples/servers/*", "examples/snippets"]
[tool.uv.sources]
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mcp = { workspace = true }
strict-no-cover = { git = "https://github.com/pydantic/strict-no-cover" }
[tool.pytest.ini_options]
log_cli = true
xfail_strict = true
addopts = """
--color=yes
--capture=fd
-p anyio
-p examples
"""
filterwarnings = [
"error",
# This should be fixed on Uvicorn's side.
"ignore::DeprecationWarning:websockets",
"ignore:websockets.server.WebSocketServerProtocol is deprecated:DeprecationWarning",
"ignore:Returning str or bytes.*:DeprecationWarning:mcp.server.lowlevel",
# pywin32 internal deprecation warning
"ignore:getargs.*The 'u' format is deprecated:DeprecationWarning",
]
[tool.markdown.lint]
default = true
MD004 = false # ul-style - Unordered list style
MD007.indent = 2 # ul-indent - Unordered list indentation
MD013 = false # line-length - Line length
MD029 = false # ol-prefix - Ordered list item prefix
MD033 = false # no-inline-html Inline HTML
MD041 = false # first-line-heading/first-line-h1
MD046 = false # indented-code-blocks
MD059 = false # descriptive-link-text
# https://coverage.readthedocs.io/en/latest/config.html#run
[tool.coverage.run]
branch = true
patch = ["subprocess"]
concurrency = ["multiprocessing", "thread"]
source = ["src", "tests"]
omit = [
"src/mcp/client/__main__.py",
"src/mcp/server/__main__.py",
"src/mcp/os/posix/utilities.py",
"src/mcp/os/win32/utilities.py",
]
# https://coverage.readthedocs.io/en/latest/config.html#report
[tool.coverage.report]
fail_under = 100
skip_covered = true
show_missing = true
ignore_errors = true
precision = 2
exclude_also = [
"pragma: lax no cover",
"@overload",
"raise NotImplementedError",
]
# https://coverage.readthedocs.io/en/latest/config.html#paths
[tool.coverage.paths]
source = [
"src/",
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"/home/runner/work/python-sdk/python-sdk/src/",
'D:\a\python-sdk\python-sdk\src',
]
[tool.inline-snapshot]
default-flags = ["disable"]
format-command = "ruff format --stdin-filename {filename}"