---
id: pr-vllm-22217
repo: vllm-project/vllm
pr: 22217
title: '[UX] Fail if an invalid attention backend is specified'
author: mgoin
date: '2025-08-05'
url: https://github.com/vllm-project/vllm/pull/22217
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: e79a12fc3afb33171b06af3f1b74a42b29d1c6c2
inclusion_reason: defer
changed_paths:
- tests/kernels/attention/test_attention_selector.py
- vllm/attention/selector.py
artifact_dir: evidence/pull-bundles/vllm/gh-22217
head_ref_oid: 5c86d200b47e05c2c8afdf3354f35ff643978db8
---
# [UX] Fail if an invalid attention backend is specified

- Repository: `vllm-project/vllm`
- PR: [22217](https://github.com/vllm-project/vllm/pull/22217)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `tests/kernels/attention/test_attention_selector.py`
- `vllm/attention/selector.py`

## Evidence Bundle

`evidence/pull-bundles/vllm/gh-22217`
