Sails New App

Goal

Move a greenfield request from scope to an approved Sails workspace path without skipping the planning artifacts that later implementation depends on.

Sequence

1. If the machine does not already have rustup, the required Wasm targets, cargo-sails, and a local gear binary, start with ../sails-dev-env/SKILL.md.
2. For a new standard Sails/Vara project, bootstrap the workspace first with cargo sails new <project-name> unless the user explicitly needs a custom non-template layout.
3. Write the feature or app goal to docs/plans/YYYY-MM-DD-<topic>-spec.md using ../../assets/spec-template.md.
4. Route architecture decisions through ../sails-architecture/SKILL.md.
5. Keep the standard template workspace shape created by cargo sails new <project-name> intact: app, client, src, tests, top-level build.rs, Wasm output, and generated-client path.
6. Keep the standard build-script pipeline intact. In a standard Sails workspace, use the repo-generated build path for .idl and Rust client artifacts. For a dedicated client crate, prefer sails-rs with features = ["build"] and sails_rs::build_client::<Program>() before introducing manual sails-idl-gen / sails-client-gen-v2 wiring.
7. Validate before moving to later phases by finishing with ../sails-gtest/SKILL.md, then ../sails-local-smoke/SKILL.md.
8. When the builder needs a frontend, use create-vara-app to scaffold it from the program's .idl: npx create-vara-app <name> --idl path/to/service.idl. Then route to ../sails-frontend/SKILL.md for customization.

Shared Inputs

• ../../references/vara-domain-overview.md
• ../../references/sails-cheatsheet.md
• ../../references/sails-program-and-service-architecture.md
• ../../references/sails-idl-client-pipeline.md
• ../../references/sails-idl-v2-syntax.md — IDL v2 annotations, !@include, service-scoped types

Guardrails

• Keep the builder on standard Sails scaffolding and generated clients.
• Keep the standard Sails workspace shape and build-generated .idl and .opt.wasm artifact path intact, and check the crate's build.rs before adding ad hoc generation steps.
• Do not jump into raw Gear primitives when a Sails path already exists.
• Do not skip the planning docs just because the repo is greenfield.
• Always use cargo sails new <project-name> for greenfield Sails/Vara work. Hand-assembled workspaces are a known source of errors: shared top-level workspaces cause Cargo feature unification to enable both gstd and gtest on sails-rs simultaneously, breaking the build. See ../../references/sails-rs-imports.md for the canonical layout.
• Use #[sails_type] for all custom types (structs, enums) used in service interfaces. This replaces the verbose #[derive(Encode, Decode, TypeInfo)] #[codec(crate = ...)] pattern from 0.x.