mypy-boto3-stepfunctions
Type annotations for boto3 SFN 1.43.7 service generated with mypy-boto3-builder 8.12.0
Decision gist · record as of 2026-08-14
Yes, if you use boto3 for Step Functions and want static type checking or IDE support. Install friction is minimal, maintenance is active, the license is permissive, and there are no known vulnerabilities. The only caveat is PyCharm users may experience performance issues with Literal overloads; if so, consider the lite variant instead.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9 or later; boto3 must be installed separately in your environment.
- Low friction: pure Python wheel with only typing-extensions as a runtime dependency.
- Actively maintained with recent releases; the project is in production/stable status and receives regular updates.
License · maintenance · safety
MIT (permissive) — MIT license permits unrestricted use, modification, and distribution in both open-source and commercial projects with minimal restrictions.
last release 2026-05-13 (93 days) · last repo commit 2026-06-22 · 670 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 3,072,034 downloads/mo, #2,765 on PyPI
Alternatives
Verify before relying
pip install mypy-boto3-stepfunctions
from boto3.session import Session
from mypy_boto3_stepfunctions import SFNClient
client: SFNClient = Session().client("stepfunctions")
# Type checking and IDE completion now work on client calls- Whether PyCharm performance issues with Literal overloads (issue PY-40997) have been resolved since the lite variant was recommended as a workaround.
- Specific performance impact when used with large codebases or in resource-constrained environments.
- Whether the package works with boto3 versions other than 1.43.7.
What it is and what it does
This package is a type stub library generated with mypy-boto3-builder 8.12.0 that adds complete type annotations to boto3's Step Functions (SFN) service compatible with boto3 1.43.7. It enables static type checkers like mypy and pyright, as well as IDEs like VSCode, PyCharm, Emacs, and Sublime Text, to provide accurate code completion and catch type errors in boto3 Step Functions code before runtime.
The package is designed as a companion to boto3 and works by providing type information for the SFNClient, paginators, waiters, and service resource types. It requires only typing-extensions as a runtime dependency and supports Python 3.9 through 3.14. Installation is straightforward via pip, and it integrates seamlessly into existing boto3 workflows without requiring code changes—type checking works automatically once installed.
Use it for
- Enable mypy or pyright type checking on boto3 Step Functions code to catch API misuse and parameter errors before deployment.
- Get IDE autocomplete and inline documentation for SFNClient methods, paginators, and type definitions in VSCode or PyCharm.
- Validate Step Functions workflow definitions and execution parameters with static analysis in CI/CD pipelines.
- Reduce runtime errors by catching incorrect service calls, missing required parameters, or wrong argument types during development.
- Integrate type-safe boto3 Step Functions code into larger typed Python projects without losing type information at service boundaries.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you use boto3 for Step Functions and want static type checking or IDE support.
Install friction is minimal, maintenance is active, the license is permissive, and there are no known vulnerabilities. The only caveat is PyCharm users may experience performance issues with Literal overloads; if so, consider the lite variant instead.
Install
mypy-boto3-stepfunctions on PyPI
Before you install
Low friction: pure Python wheel with only typing-extensions as a runtime dependency. Actively maintained with recent releases; the project is in production/stable status and receives regular updates.
Requires Python 3.9 or later; boto3 must be installed separately in your environment.
License in practice
MIT license permits unrestricted use, modification, and distribution in both open-source and commercial projects with minimal restrictions.
Quickstart
pip install mypy-boto3-stepfunctions
from boto3.session import Session
from mypy_boto3_stepfunctions import SFNClient
client: SFNClient = Session().client("stepfunctions")
# Type checking and IDE completion now work on client callsVerify before relying
- Whether PyCharm performance issues with Literal overloads (issue PY-40997) have been resolved since the lite variant was recommended as a workaround.
- Specific performance impact when used with large codebases or in resource-constrained environments.
- Whether the package works with boto3 versions other than 1.43.7.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagetyping-extensions |
| Maintenance | Actively maintained 93 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 3,072,034 / month, #2,765 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: ConsoleIntended Audience :: DevelopersNatural Language :: EnglishOperating System :: OS IndependentProgramming Language :: Python :: 3Programming Language :: Python :: 3 :: OnlyProgramming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonTyping :: Stubs Only |
Evidence: mypy_boto3_stepfunctions-1.43.7-py3-none-any.whl
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See also types-aiobotocore-stepfunctions · types-boto3-stepfunctions · mypy-boto3-billingconductor · mypy-boto3-ec2 · mypy-boto3-fis · mypy-boto3-connect · mypy-boto3-fsx · mypy-boto3-evidently · mypy-boto3-codepipeline · mypy-boto3-batch