fastmcp/pyproject.toml

[project]
name = "fastmcp"
dynamic = ["version"]
description = "The fast, Pythonic way to build MCP servers and clients."
authors = [{ name = "Jeremiah Lowin" }]
dependencies = [
    "python-dotenv>=1.1.0",
    "exceptiongroup>=1.2.2",
    "httpx>=0.28.1,<1.0",
    "mcp>=1.24.0,<2.0",
    "openapi-pydantic>=0.5.1",
    "opentelemetry-api>=1.20.0",
    "packaging>=24.0",
    "platformdirs>=4.0.0",
    "rich>=13.9.4",
    "cyclopts>=4.0.0",
    "authlib>=1.6.5",
    "pydantic[email]>=2.11.7",
    "pyyaml>=6.0,<7.0",
    "pyperclip>=1.9.0",
    "py-key-value-aio[filetree,keyring,memory]>=0.4.4,<0.5.0",
    "uvicorn>=0.35",
    "websockets>=15.0.1",
    "jsonschema-path>=0.3.4",
    "jsonref>=1.1.0",
    "uncalled-for>=0.2.0",
    "watchfiles>=1.0.0",
]

requires-python = ">=3.10"
readme = "README.md"
license = "Apache-2.0"

keywords = [
    "mcp",
    "mcp server",
    "mcp client",
    "model context protocol",
    "fastmcp",
    "llm",
    "agent",
]
classifiers = [
    "Intended Audience :: Developers",
    "License :: OSI Approved :: Apache Software License",
    "Topic :: Scientific/Engineering :: Artificial Intelligence",
    "Programming Language :: Python :: 3.10",
    "Programming Language :: Python :: 3.11",
    "Programming Language :: Python :: 3.12",
    "Programming Language :: Python :: 3.13",
    "Typing :: Typed",
]

[project.optional-dependencies]
anthropic = ["anthropic>=0.48.0"]
apps = ["prefab-ui>=0.18.0"]
# PyJWT floor: transitive via msal; CVE-2026-32597 affects <= 2.11.0
azure = ["azure-identity>=1.16.0", "PyJWT>=2.12.0"]
code-mode = ["pydantic-monty==0.0.9"]
gemini = ["google-genai>=1.18.0"]
openai = ["openai>=1.102.0"]
tasks = ["pydocket>=0.18.0"]

[dependency-groups]
dev = [
    "dirty-equals>=0.9.0",
    "fastmcp[anthropic,apps,azure,code-mode,gemini,openai,tasks]",
    # add optional dependencies for fastmcp dev
    "fastapi>=0.115.12",
    "opentelemetry-sdk>=1.20.0",
    "inline-snapshot[dirty-equals]>=0.27.2",
    "ipython>=8.12.3",
    "pdbpp>=0.11.7",
    "psutil>=7.0.0",
    "pyinstrument>=5.0.2",
    "pyperclip>=1.9.0",
    "pytest>=8.3.3",
    "pytest-asyncio>=1.2.0",
    "pytest-cov>=6.1.1",
    "pytest-env>=1.1.5",
    "pytest-flakefinder>=1.1.0",
    "pytest-httpx>=0.35.0",
    "pytest-report>=0.2.1",
    "pytest-retry>=1.7.0",
    "pytest-timeout>=2.4.0",
    "pytest-xdist>=3.6.1",
    "ruff>=0.12.8",
    "ty>=0.0.26",
    "prek>=0.2.12",
    "loq>=0.1.0a3",
    "opentelemetry-exporter-otlp-proto-grpc>=1.39.0",
]

[project.scripts]
fastmcp = "fastmcp.cli:app"

[project.urls]
Homepage = "https://gofastmcp.com"
Repository = "https://github.com/PrefectHQ/fastmcp"
Documentation = "https://gofastmcp.com"

[build-system]
requires = ["hatchling", "uv-dynamic-versioning>=0.7.0"]
build-backend = "hatchling.build"

[tool.hatch.version]
source = "uv-dynamic-versioning"

[tool.hatch.metadata]
allow-direct-references = true


[tool.uv-dynamic-versioning]
vcs = "git"
style = "pep440"
bump = true
fallback-version = "0.0.0"


[tool.pytest.ini_options]
asyncio_mode = "auto"
asyncio_default_fixture_loop_scope = "function"
# filterwarnings = ["error::DeprecationWarning"]
filterwarnings = [
    # Suppress OAuth in-memory token storage warnings in tests
    # Tests intentionally use ephemeral storage; this warning is for end users
    "ignore:Using in-memory token storage:UserWarning",
    # Treat unawaited coroutine warnings as errors - these are almost always bugs
    "error:coroutine .* was never awaited:RuntimeWarning",
    "error:Exception ignored in.*coroutine:pytest.PytestUnraisableExceptionWarning",
]
timeout = 5
env = [
    "FASTMCP_TEST_MODE=1",
    'D:FASTMCP_LOG_LEVEL=DEBUG',
    'D:FASTMCP_ENABLE_RICH_TRACEBACKS=0',

]
markers = [
    "integration: marks tests as integration tests (deselect with '-m \"not integration\"')",
    "client_process: marks tests that spawn client processes via stdio transport. These can create issues when run in the same CI environment as other subprocess-based tests.",
    "conformance: marks MCP conformance tests (require Node.js/npx)",
]
# Automatically mark all tests in integration_tests folder
pythonpath = ["."]
testpaths = ["tests"]
python_files = ["test_*.py", "*_test.py"]
python_classes = ["Test*"]
python_functions = ["test_*"]
addopts = ["--inline-snapshot=disable"]

[tool.ty.src]
include = ["src", "tests"]
exclude = ["**/node_modules", "**/__pycache__", ".venv", ".git", "dist"]

[tool.ty.environment]
python-version = "3.10"

[tool.ty.rules]
# NOTE: ty currently doesn't support type narrowing with isinstance() on unions
# See: https://github.com/astral-sh/ty/issues/122 and https://github.com/astral-sh/ty/issues/1113
# Some code uses `# ty: ignore[invalid-argument-type]` for this limitation.
# TODO: Remove these ignores once ty supports union narrowing

[tool.ty.terminal]
error-on-warning = true

[tool.ruff.lint]
fixable = ["ALL"]
ignore = [
    "COM812",
    "PLR0913", # Too many arguments, MCP Servers have a lot of arguments, OKAY?!
    "SIM102",  # Dont require combining if statements
]
extend-select = [
    "B",   # flake8-bugbear: Catches actual bugs like mutable default arguments
    "C4",  # flake8-comprehensions: More efficient/readable comprehensions
    "I",   # flake8-builtins: Catches builtins that are not explicitly imported
    "PIE", # flake8-pie: More idiomatic Python code
    "RUF", # Ruff-specific: Modern best practices unique to Ruff
    "SIM", # flake8-simplify: Simplifies verbose code patterns
    "UP",  # flake8-unused-imports: Catches unused imports
]

[tool.ruff.lint.isort]
known-first-party = ["fastmcp"]

[tool.ruff.lint.per-file-ignores]
"__init__.py" = ["F401", "I001", "RUF013"]
# allow imports not at the top of the file
"src/fastmcp/__init__.py" = ["E402"]
"!src/**.py" = [ # Only enforce extended ruff rules for code in src/
    "B",   # flake8-bugbear
    "C4",  # flake8-comprehensions
    "PIE", # flake8-pie
    "RUF", # Ruff-specific
    "SIM", # flake8-simplify
]


[tool.codespell]
ignore-words-list = "asend,shttp,te"