[BUG] function_schema_parser does not support new python union types

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#51 opened on Sep 18, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 3/5
Estimated time: 1-2 days
Newbie friendliness: 42/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: python
Domain: backend

Research direction

Locate the function_schema_parser entry point and reproduce the exception with the dataclass examples in this issue. Trace how Optional annotations are handled, then verify that the equivalent Python union annotations are accepted without an exception while existing Optional behavior remains intact.

Written by the indexing model from the issue text.

Description

Similar to https://github.com/palantir/python-compute-module/issues/50
You can't do this:

@dataclass
class ExternalImageSearchResponse:
    result: None | external.ImageSearchResponse
    error: None | str

You must do this:

@dataclass
class ExternalImageSearchResponse:
    result: Optional[external.ImageSearchResponse]
    error: Optional[str]

or the parser throws an exception

Dominant language: Python
Stars: 15
Forks: 11
PR merge metrics: No merged PRs in 30d

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