langchain/libs/core/pyproject.toml

[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[project]
name = "langchain-core"
description = "Building applications with LLMs through composability"
license = {text = "MIT"}
readme = "README.md"
classifiers = [
    "Development Status :: 5 - Production/Stable",
    "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",
    "Programming Language :: Python :: 3.14",
    "Topic :: Scientific/Engineering :: Artificial Intelligence",
    "Topic :: Software Development :: Libraries :: Python Modules",
]

version = "1.5.1"
requires-python = ">=3.10.0,<4.0.0"
dependencies = [
    "langsmith>=0.3.45,<1.0.0",
    "tenacity!=8.4.0,>=8.1.0,<10.0.0",
    "jsonpatch>=1.33.0,<2.0.0",
    "PyYAML>=5.3.0,<7.0.0",
    "typing-extensions>=4.7.0,<5.0.0",
    "packaging>=23.2.0",
    "pydantic>=2.7.4,<3.0.0",
    "uuid-utils>=0.12.0,<1.0",
    "langchain-protocol>=0.0.17",
]

[project.urls]
Homepage = "https://docs.langchain.com/"
Documentation = "https://reference.langchain.com/python/langchain_core/"
Repository = "https://github.com/langchain-ai/langchain"
Issues = "https://github.com/langchain-ai/langchain/issues"
Changelog = "https://github.com/langchain-ai/langchain/releases?q=%22langchain-core%3D%3D1%22"
Twitter = "https://x.com/langchain_oss"
Slack = "https://www.langchain.com/join-community"
Reddit = "https://www.reddit.com/r/LangChain/"

[dependency-groups]
lint = ["ruff>=0.15.0,<0.16.0"]
typing = [
    "mypy>=2.1.0,<2.2.0",
    "types-pyyaml>=6.0.12.2,<7.0.0.0",
    "types-requests>=2.28.11.5,<3.0.0.0",
    "langchain-text-splitters>=1.0.0,<2.0.0",
]
dev = [
    "jupyter>=1.0.0,<2.0.0",
    "setuptools>=67.6.1,<84.0.0",
    "grandalf>=0.8.0,<1.0.0",
]
test = [
    "pytest>=9.0.3,<10.0.0",
    "freezegun>=1.2.2,<2.0.0",
    "pytest-mock>=3.10.0,<4.0.0",
    "syrupy>=5.0.0,<6.0.0",
    "pytest-watcher>=0.3.4,<1.0.0",
    "pytest-asyncio>=1.3.0,<2.0.0",
    "grandalf>=0.8.0,<1.0.0",
    "responses>=0.25.0,<1.0.0",
    "pytest-socket>=0.7.0,<1.0.0",
    "pytest-xdist<4.0.0,>=3.6.1",
    "blockbuster>=1.5.18,<1.6.0",
    "numpy>=1.26.4; python_version<'3.13'",
    "numpy>=2.1.0; python_version>='3.13'",
    "langchain-tests>=1.1.9,<2.0.0",
    "pytest-benchmark",
    "pytest-codspeed",
]
test_integration = []

[tool.uv]
constraint-dependencies = ["pygments>=2.20.0"]  # CVE-2026-4539

[tool.uv.sources]
langchain-tests = { path = "../standard-tests" }
langchain-text-splitters = { path = "../text-splitters" }


[tool.mypy]
plugins = ["pydantic.mypy"]
strict = true
enable_error_code = "deprecated"
warn_unreachable = true

[tool.ruff.format]
docstring-code-format = true

[tool.ruff.lint]
select = [ "ALL",]
ignore = [
    "C90",     # McCabe complexity
    "COM812",  # Messes with the formatter
    "CPY",     # No copyright
    "FIX002",  # Line contains TODO
    "PERF203", # Rarely useful
    "PLR09",   # Too many something (arg, statements, etc)
    "TD002",   # Missing author in TODO
    "TD003",   # Missing issue link in TODO

    # TODO rules
    "ANN401",  # No Any types
    "BLE",     # Blind exceptions
    "ERA",     # No commented-out code
]
unfixable = [
    "B028",    # People should intentionally tune the stacklevel
]

flake8-annotations.allow-star-arg-any = true
flake8-annotations.mypy-init-return = true
flake8-builtins.ignorelist = ["id", "input", "type"]
flake8-type-checking.runtime-evaluated-base-classes = [ "pydantic.BaseModel", "langchain_core.load.serializable.Serializable", "langchain_core.runnables.base.RunnableSerializable", "langchain_core.language_models.base.BaseLanguageModel", "langchain_core.outputs.generation.Generation", "langchain_core.tools.base.BaseTool",]
pep8-naming.classmethod-decorators = [ "classmethod", "langchain_core.utils.pydantic.pre_init", "pydantic.field_validator", "pydantic.v1.root_validator",]

[tool.ruff.lint.flake8-tidy-imports]
ban-relative-imports = "all"

[tool.ruff.lint.pydocstyle]
convention = "google"
ignore-var-parameters = true  # ignore missing documentation for *args and **kwargs parameters

[tool.ruff.lint.per-file-ignores]
"langchain_core/utils/mustache.py" = [ "PLW0603",]
"langchain_core/sys_info.py" = [ "T201",]
"tests/unit_tests/test_tools.py" = [ "ARG",]
"tests/**" = [ "D1", "PLR2004", "S", "SLF",]
"scripts/**" = [ "INP", "S", "T201",]

[tool.coverage.run]
omit = [ "tests/*",]

[tool.pytest.ini_options]
addopts = "--snapshot-warn-unused --strict-markers --strict-config --durations=5"
markers = [
    "requires: mark tests as requiring a specific library",
    "compile: mark placeholder test used to compile integration tests without running them",
]
asyncio_mode = "auto"
asyncio_default_fixture_loop_scope = "function"
filterwarnings = [ "ignore::langchain_core._api.beta_decorator.LangChainBetaWarning",]