Attribute Macro get 

#[get]

Declares a GET operation.

#[get("/users/{id}", id = "users.read", summary = "Read a user")]
async fn read_user(Path(id): Path<u64>) -> Json<UserView> { .. }

The path is positional and first. id is required and is the operation’s stable identity: it names the operation in the contract, in OpenAPI, in the generated documentation, in compatibility reports, and as the MCP tool name, so it must outlive changes to the path and to the function name. summary is optional and supplies the one-line description that reaches the OpenAPI operation, the cargo blazingly routes table, and the MCP tool description.

Handler arguments are the extractors — Path, Query, Header, Cookie, Json, Form, Multipart, File, Extract<T> — and compiled dependency requests, in any combination. The return type declares the response contract. The handler may be async or plain fn; a plain fn runs inline on the calling thread and is never moved to the blocking pool, so work that genuinely blocks must call run_blocking.

This is an alias for operation with the method fixed.