From 2b9fed3bbdbf5c1681458f9a17017ad431825f8d Mon Sep 17 00:00:00 2001
From: chiri <chirizxc@proton.me>
Date: Mon, 19 Jan 2026 19:23:51 +0300
Subject: [PATCH] [`FastAPI`] Document fix safety for `FAST001` (#22655)

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## Summary

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## Test Plan

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---
 .../rules/fastapi/rules/fastapi_redundant_response_model.rs  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/crates/ruff_linter/src/rules/fastapi/rules/fastapi_redundant_response_model.rs b/crates/ruff_linter/src/rules/fastapi/rules/fastapi_redundant_response_model.rs
index d31ffbf61e..a52b1c5bd9 100644
--- a/crates/ruff_linter/src/rules/fastapi/rules/fastapi_redundant_response_model.rs
+++ b/crates/ruff_linter/src/rules/fastapi/rules/fastapi_redundant_response_model.rs
@@ -58,6 +58,11 @@ use crate::{AlwaysFixableViolation, Fix};
 /// async def create_item(item: Item) -> Item:
 ///     return item
 /// ```
+///
+/// ## Fix safety
+/// This fix is always unsafe, as removing the `response_model` argument can change
+/// runtime behavior and API documentation generation. Additionally, comments inside
+/// the decorator might be removed when the argument is deleted.
 #[derive(ViolationMetadata)]
 #[violation_metadata(stable_since = "0.8.0")]
 pub(crate) struct FastApiRedundantResponseModel;