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Current State

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Implemented Today

1. a Rust 2024 multi-crate workspace under cratestack/
2. schema parsing and semantic validation for an initial .cstack subset
3. compile-time include_schema! expansion into a generated full server/client cratestack_schema module
4. SQLx-backed model delegates for create, find_many, find_unique, update, and delete
5. generated Axum model CRUD and procedure routes
6. host-owned authentication through AuthProvider and internal binding through bind_auth(...) and bind_context(...)
7. generated Rust client support through both full-schema include_schema! and client-only include_client_macro!, plus generated Dart package output
8. policy enforcement for the current supported model and procedure policy subset
9. generated telemetry for procedure wrappers, procedure routes, and model list routes
10. top-level mixin declarations plus model @use(...) expansion for reusable field sets

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Still Narrow Or Deferred

1. COSE transport remains an unimplemented envelope seam
2. negotiated multi-codec routing is not complete end-to-end
3. the parser still validates only an initial schema subset
4. production-stable exact non-Rust selection typing is not complete
5. richer exposure controls and some field-level policy features are still deferred
6. the client runtime remains partially spiked rather than fully mature

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Best Fit Right Now

1. internal CRUD-heavy Rust services
2. teams that want one schema to drive delegates, routes, and client contracts
3. services that benefit from generated policy checks and typed query builders
4. CBOR-first or CBOR-aware HTTP APIs that still need JSON fallback

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Read Next

1. ../getting-started/quickstart for a minimal setup path
2. ../guides/auth-provider for the host auth boundary
3. ../architecture/transport-architecture for transport design
4. ../reference/auth-support-matrix for the current auth and policy surface