Typings for coroutine returned instead of value returned when awaiting async task (functional api)

[lightsofapollo]

Checked other resources

• This is a bug, not a usage question. For questions, please use GitHub Discussions.
• I added a clear and detailed title that summarizes the issue.
• I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
• I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.

Example Code

@task
async def retrieve():
    return "foo"

Error Message and Stack Trace (if applicable)

Description

Using langggraph functional api with async functions I am getting typing errors. It seems to always return a coroutine instead of the final value when I await it.

System Info

System Information

OS: Darwin
OS Version: Darwin Kernel Version 24.1.0: Thu Oct 10 21:03:11 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T6020
Python Version: 3.12.8 (main, Jan 5 2025, 06:55:30) [Clang 19.1.6 ]

Package Information

langchain_core: 0.3.33
langchain: 0.3.17
langchain_community: 0.3.15
langsmith: 0.3.1
langchain_anthropic: 0.3.4
langchain_experimental: 0.3.4
langchain_google_genai: 2.0.9
langchain_openai: 0.3.2
langchain_text_splitters: 0.3.5
langgraph_sdk: 0.1.51

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.11.11
anthropic: 0.45.0
async-timeout: Installed. No version info available.
dataclasses-json: 0.6.7
defusedxml: 0.7.1
filetype: 1.2.0
google-generativeai: 0.8.4
httpx: 0.28.1
httpx-sse: 0.4.0
jsonpatch: 1.33
langsmith-pyo3: Installed. No version info available.
numpy: 1.26.4
openai: 1.61.0
orjson: 3.10.15
packaging: 24.2
pydantic: 2.10.6
pydantic-settings: 2.7.1
pytest: Installed. No version info available.
PyYAML: 6.0.2
requests: 2.32.3
requests-toolbelt: 1.0.0
rich: 13.9.4
SQLAlchemy: 2.0.37
tenacity: 9.0.0
tiktoken: 0.8.0
typing-extensions: 4.12.2
zstandard: 0.23.0