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Create, update, refactor, audit, or align repository AGENTS.md guidance from repository evidence without adding language, tool, or dependency recommendations.

Guide for writing, refactoring, reviewing, optimizing, and documenting idiomatic Rust code on a Rust 1.97 stable baseline.

Design, patch, audit, or align Rust tests with evidence-based guidance for unit tests, integration/e2e tests, doctests, insta snapshots, compile-fail/UI tests, golden files, fixtures, property tests, fuzz tests, async/concurrency tests, unsafe-code validation, Criterion benchmarks, Cargo test semantics, Rust 1.97 test idioms, feature/target/MSRV matrices, flaky-test triage, coverage/mutation evidence, and focused validation.

Apply forward-only editing, documentation, and review rules for Rust crates or workspaces whose package or workspace version is below 1.0. Use when editing, reviewing, or documenting pre-1.0 Rust APIs, READMEs, AGENTS.md guidance, examples, release notes, migration text, or workflow docs: omit durable absent-surface negative prose such as "does not currently..." and avoid backward/legacy compatibility obligations, old API preservation, aliases, wrappers, or shims unless explicit repository policy or the user requires them.

Use when Codex needs to wire component-shape-gpui shapes into gpui-form forms, including #[gpui_form(component(...))], gpui-form-runtime storage policy, configured shape builders, value compatibility or binding, generated fields/components/value holders, component MCP metadata, and inventory prototyping.

Use when Codex needs to build or expose user-facing application forms with gpui-form, including #[derive(GpuiForm)], field intents and conversions, generated fields/components/value holders, built-in component shapes, SelectItem or InfiniteSelect enums, Koruma validation, inventory prototyping, and MCP submit or editor tools.

Use when Codex needs to wire component-shape filter shapes into gpui-table tables, including #[gpui_table(filter(...))], GpuiTableFilterShape, field support, generated filter entities/values, MCP filter decoding, Koruma newtype filters, or prototyping metadata.

Build or extend user-facing Rust GPUI application tables with gpui-table. Use when application code needs #[derive(GpuiTable)], #[derive(Filterable)], #[derive(TableCell)], #[gpui_table_impl], generated table delegates, columns, filter entities, and filter values, built-in filters such as text, faceted, number_range, or date_range, TableStatusBar, load-more behavior, custom cell rendering, row context menus, localized labels with fluent, MCP query tools, or feature flags such as mcp, rust_decimal, chrono, or spacetimedb.

Use when Codex needs to add, review, or refactor GPUI component shape declarations with component_shape_gpui::GpuiComponentShape, component_shape_gpui::component_shape!, declared-shape markers, render and value-binding contracts, configured shape builders, MCP input metadata, or GPUI macro syntax.

Use when Codex needs to add, review, or refactor framework-neutral component-shape metadata, including ComponentShapeMetadata, ComponentShapeFor, DeclaredComponentShape, ComponentShapeUse, capabilities, prototyping suffixes, Rust syntax wrappers, MCP input metadata, value changes, or generator-facing contracts.

Use when adding, reviewing, or updating Bevy integrations for frame-capture, including frame-capture-bevy live and capture mode setup, offscreen screenshot runtime wiring, RoutePlugin route selection, capture_window_plugin, CaptureReady, Bevy registered-route APIs, capture env parsing, frame gates, and scenarios.

Use when adding, reviewing, or updating generic frame-capture integrations in Rust applications that own their renderer or screenshot pipeline, including direct frame-capture usage, frame-capture-routes, egui, GPUI, raw wgpu, custom renderer facades, route enums, registered routes, capture environment parsing, scenarios, frame gates, output paths, and route catalog metadata.

Use when helping application developers adopt GPUI Storybook in an app: setting up a storybook binary, adding stories with #[story] or #[derive(ComponentStory)], configuring storybook.toml group/allow/disable_story behavior, choosing gallery versus dock mode, wiring locale initialization, enabling MCP automation/capture, or troubleshooting missing stories.

Use when adding, changing, documenting, or reviewing es-fluent localization in Rust applications. Covers choosing `es-fluent`, using the `cargo es-fluent` CLI, embedded/Dioxus/Bevy managers, typed language enums, deriving Fluent messages, generated FTL, and explicit manager contexts.

Use only for user-facing guidance on applying koruma or koruma-collection in application Rust code, including feature flags, core traits, custom #[validator] validators and setter metadata, field #[koruma(...)] validators/modifiers/labels/target selectors, optional and per-element each(...) validation, generated error accessors, KorumaAllDisplay or KorumaAllFluent rendering, nested validation, newtype validation, try_new or TryFrom checked constructors, built-in validator selection, validator messages, and i18n. Do not use for generic Rust build/test tasks.