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Agents Python SDK errors and fixes: 1 guide

Real Agents Python SDK failures, each with the error you'll see, the cause and steps that worked. 1 of 1 fixed upstream. Search within Agents Python SDK.

Fixed: 1

Agents Python SDKFixed (verified)
Apply-patch splits on splitlines so a form feed breaks Add File
SandboxApplyPatchTool parses a freeform patch with raw_input.splitlines(). A form feed or U+2028 inside a line is treated as a line break, so *** Add File: fails with Invalid Add File line: page two and *** Update File: fails with apply_diff -> Invalid Line: b";.
Last checked Oct 19, 2026#parsing#error-messages2 steps →

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Agents Python SDK errors and fixes: 1 guide

Fixed: 1

Apply-patch splits on splitlines so a form feed breaks Add File