Create Crate

Creating a New Crate

All new service crates must be generated from TypeSpec specifications in Azure/azure-rest-api-specs. Do not hand-write client libraries from scratch.

1. Install tsp-client

   • Use the repository-pinned CLI; do not invoke a globally installed binary:

     _TspClientDir="$(pwd)/eng/common/tsp-client"
     npm ci --prefix "$_TspClientDir"
     

   • Run commands with npm exec --prefix "$_TspClientDir" --no -- tsp-client

   • See eng/common/tsp-client/README.md for prerequisites and more context

2. Find the TypeSpec spec

   • Look for a tspconfig.yaml under specification/{service}/ in azure-rest-api-specs
   • Check the tspconfig.yaml for @azure-tools/typespec-rust emitter configuration
   • If no emitter configuration exists, stop and report an error indicating that the TypeSpec specification in Azure/azure-rest-api-specs must be updated before generating the client

3. Initialize the crate

   • From the repository root, run npm exec --prefix "$_TspClientDir" --no -- tsp-client init --tsp-config {url}
   • {url} is the GitHub URL to the tspconfig.yaml
   • Always use a specific commit SHA in the URL — never a branch or tag, which can move
   • Example: https://github.com/Azure/azure-rest-api-specs/blob/{commit-sha}/specification/{service}/{rp}/tspconfig.yaml

4. Generate the client

   • Use the azsdk_package_generate_code MCP tool, or
   • From the crate directory, run npm exec --prefix "$_TspClientDir" --no -- tsp-client update

5. Add hand-written wrappers

   • Create clients.rs (or similar) for custom client constructors, authentication setup, and convenience methods
   • Build on top of the generated code in src/generated/

6. Register the crate

   • Add the new crate to the workspace members list in the root Cargo.toml

7. Add tests, examples, and documentation

   • Write unit tests and integration tests (using #[recorded::test])
   • Add examples, a README.md, and a CHANGELOG.md