Michael Bolin
b1546008fc
## Why We have run into two avoidable problems when introducing async trait APIs in Rust: - `#[async_trait]` has caused materially worse build times in this repository. - `#[allow(async_fn_in_trait)]` makes it too easy to ship a public trait without spelling out whether the returned future is `Send`, which hides an important part of the trait contract. We already have a good example of the preferred alternative in [#16630](https://github.com/openai/codex/pull/16630) / [`3c7f013f9735`](https://github.com/openai/codex/commit/3c7f013f9735), but that guidance currently lives only as prior art in the codebase. This PR documents the rule in `AGENTS.md` so contributors are more likely to follow the native RPITIT pattern before these two shortcuts spread further. ## What Changed - added Rust guidance in `AGENTS.md` discouraging both `#[async_trait]` and `#[allow(async_fn_in_trait)]` - pointed contributors to the native RPITIT pattern with explicit `Send` bounds on the returned future - clarified that implementations may still use `async fn` when they satisfy that trait contract ## Verification - docs-only change; no tests run
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