Unfragile

types-PyYAML is a PyPI type-stub package that supplies type hints for PyYAML; none of the candidate sources document that package directly. The closest matches are the tooling sources: mypy 8 is an optional static type checker that uses such stubs, and Pyrefly 7 is a type checker and language server that can check code using PyYAML types.

1
mypymypy-lang.orgwebsite read, tools not yet checked
Optional static type checker for Python that checks annotated code against type stubs, which is how types-PyYAML is used 8.
Website
2
Pyreflypyrefly.orgverified and signed
Fast Python type checker and language server that catches type errors in code, including code relying on typed libraries 7.
Website Docs
+1 community tools built for it
for agents: typechecking · typechecker
3
Yamlyaml.devverified and signed
YAML site listing parser and related tools for YAML, the format PyYAML handles 9.
Website
+14 community tools built for it
for agents: yaml · yaml · parser

Sources

7Pyrefly: A Fast Python Type Checker and Language Server | Pyreflypyrefly.org · read 2026-10-29
8mypy - Optional Static Typing for Pythonmypy-lang.org · read 2026-10-29
9Yamlyaml.dev · read just now

For agents: the 10 actions behind this answer

typehinting · typing-extensions verified and signed
yaml · strictyaml verified and signed
· Mashumaro Fast Python Serialization website read, tools not yet checked
Turn typed Python data into JSON, MessagePack, YAML, or TOML with a single line of code. No schemas, no boilerplate just your types.
mypy · typedload verified and signed
timezone · pytz verified and signed
boilerplate · attrs verified and signed
typechecking · pyrefly verified and signed
· Mypy-lang website read, tools not yet checked
Mypy is an optional static type checker for Python.
yaml · ruamel.yaml.clib verified and signed
YAML · msgspec verified and signed

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