> ## Documentation Index
> Fetch the complete documentation index at: https://openrouter-d02e98a0-mintlify-7021d5f4.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# ApplyPatchEngineEnum - Python SDK

> ApplyPatchEngineEnum method reference

<Warning>
  The Python SDK and docs are currently in beta.
  Report issues on [GitHub](https://github.com/OpenRouterTeam/python-sdk/issues).
</Warning>

Which apply\_patch engine to use. "auto" (default) uses native passthrough when the endpoint advertises native apply\_patch support, otherwise falls back to OpenRouter's HITL validator. "native" forces native passthrough — when the endpoint does not support native, the request falls back to HITL. "openrouter" always runs the HITL validator. Native passthrough streams the diff incrementally via `apply_patch_call_operation_diff.delta` events; HITL buffers the diff for atomic delivery as a single delta.

## Values

| Name         | Value      |
| ------------ | ---------- |
| `AUTO`       | auto       |
| `NATIVE`     | native     |
| `OPENROUTER` | openrouter |