claude-codes 2.1.51

# claude-codes

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A typed Rust interface for the [Claude Code](https://docs.anthropic.com/en/docs/claude-code) JSON protocol.

Part of the [rust-code-agent-sdks](https://github.com/meawoppl/rust-code-agent-sdks) workspace.

## Overview

This library provides type-safe bindings for communicating with the Claude CLI via its JSON Lines protocol. It handles message serialization, streaming responses, and session management.

**Note:** The Claude CLI protocol is unstable and may change between versions. This crate tracks protocol changes and will warn if you're using an untested CLI version.

## Installation

### Default (All Features)
```bash
cargo add claude-codes
```

Requires the [Claude CLI](https://docs.anthropic.com/en/docs/claude-code) (`claude` binary) to be installed and available in PATH.

### Feature Flags

| Feature | Description | WASM-compatible |
|---------|-------------|-----------------|
| `types` | Core message types only (minimal dependencies) | Yes |
| `sync-client` | Synchronous client with blocking I/O | No |
| `async-client` | Asynchronous client with tokio runtime | No |

All features are enabled by default.

#### Types Only (WASM-compatible)
```toml
[dependencies]
claude-codes = { version = "2", default-features = false, features = ["types"] }
```

This gives you access to all typed message structures (`ClaudeInput`, `ClaudeOutput`, `ContentBlock`, etc.) without pulling in tokio or other native-only dependencies. Useful for frontend apps, shared type definitions, or any WASM context needing Claude protocol types.

#### Sync Client Only
```toml
[dependencies]
claude-codes = { version = "2", default-features = false, features = ["sync-client"] }
```

#### Async Client Only
```toml
[dependencies]
claude-codes = { version = "2", default-features = false, features = ["async-client"] }
```

## Usage

### Async Client

```rust
use claude_codes::AsyncClient;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut client = AsyncClient::with_defaults().await?;

    let mut stream = client.query_stream("What is 2 + 2?").await?;

    while let Some(response) = stream.next().await {
        match response {
            Ok(output) => println!("Got: {}", output.message_type()),
            Err(e) => eprintln!("Error: {}", e),
        }
    }

    Ok(())
}
```

### Sync Client

```rust
use claude_codes::{SyncClient, ClaudeInput};
use uuid::Uuid;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut client = SyncClient::with_defaults()?;

    let input = ClaudeInput::user_message("What is 2 + 2?", Uuid::new_v4());
    let responses = client.query(input)?;

    for response in responses {
        println!("Got: {}", response.message_type());
    }

    Ok(())
}
```

### Sending Images

```rust
use claude_codes::{AsyncClient, ClaudeInput};
use base64::{engine::general_purpose::STANDARD, Engine};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut client = AsyncClient::with_defaults().await?;

    let image_data = std::fs::read("diagram.png")?;
    let base64_image = STANDARD.encode(&image_data);

    let input = ClaudeInput::user_message_with_image(
        base64_image,
        "image/png".to_string(),
        Some("What's in this image?".to_string()),
        uuid::Uuid::new_v4(),
    )?;

    client.send(&input).await?;

    Ok(())
}
```

### Raw Protocol Access

```rust
use claude_codes::{Protocol, ClaudeOutput};

let json_line = r#"{"type":"assistant","message":{...}}"#;
let output: ClaudeOutput = Protocol::deserialize(json_line)?;

let serialized = Protocol::serialize(&output)?;
```

## Compatibility

**Tested against:** Claude CLI 2.1.47

The crate version tracks the Claude CLI version. If you're using a different CLI version, please report whether it works at:
https://github.com/meawoppl/rust-code-agent-sdks/issues

## License

Apache-2.0. See [LICENSE](../LICENSE).