Module blocking 

Available on crate feature sync only.

Blocking (synchronous) variants of the HTTP surface.

Mirrors the async API in crate::client / crate::messages::api / crate::models but uses reqwest::blocking under the hood, so no tokio runtime is required.

Gated on the sync feature.

use claude_api::blocking::Client;
use claude_api::messages::CreateMessageRequest;
use claude_api::types::ModelId;

let client = Client::new(std::env::var("ANTHROPIC_API_KEY").unwrap());
let req = CreateMessageRequest::builder()
    .model(ModelId::SONNET_4_6)
    .max_tokens(64)
    .user("hi")
    .build()
    .unwrap();
let resp = client.messages().create(req).unwrap();

Scope

v0.2 ships sync support for the transport layer only: Client, Messages, Models. Higher-level helpers (Conversation, ToolRegistry, Client::run, streaming) remain async-only. Most apps that want sync are looking for “I just need a simple HTTP client” – reach for the async path if you need the multi-turn or agent helpers.

Structs

Client

Synchronous HTTP client for the Anthropic API.

ClientBuilder

Builder for Client.

Messages

Namespace handle for the Messages API (sync).

Models

Namespace handle for the Models API (sync).