---
id: mypy-boto3-stepfunctions
version: "1.43.7"
license: MIT
license_treatment: permissive
maintenance: active
---

# mypy-boto3-stepfunctions — Type annotations for boto3 SFN 1.43.7 service generated with mypy-boto3-builder 8.12.0

License: permissive · Maintenance: active · Downloads: 3.1M/mo

## 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 above — verify before relying.

Provides type annotations and IDE autocompletion for boto3's Step Functions service, enabling static type checking with mypy, pyright, and IDE support.

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

pip install mypy-boto3-stepfunctions
uv add mypy-boto3-stepfunctions
poetry add mypy-boto3-stepfunctions

## Installing mypy-boto3-stepfunctions

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.

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 calls

Requires Python 3.9 or later; boto3 must be installed separately in your environment.

Verify 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_current
- Install friction: low
- Maintenance: active
- Downloads: 3.1M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

boto3 type stubs stepfunctions, aws step functions type hints, boto3 stepfunctions mypy, type checking aws workflows, boto3 ide autocomplete sfn, stepfunctions type annotations, boto3 type annotations, type-stubs, aws-sdk, boto3

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