openpencil/crates/anthropic-agent-sdk

Claude Agent SDK for Rust

Rust SDK for building AI agents powered by Claude Code. Mirrors the TypeScript Claude Agent SDK with idiomatic Rust patterns.

Installation

Prerequisites:

• Rust 1.85.0+ (edition 2024)
• Node.js
• Claude Code 2.0.75+: npm install -g @anthropic-ai/claude-code

[dependencies]
anthropic-agent-sdk = "0.2"
tokio = { version = "1", features = ["rt-multi-thread", "macros"] }

Quick Start

use anthropic_agent_sdk::{query, Message, ContentBlock, StreamExt};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let stream = query("What is 2 + 2?", None).await?;
    let mut stream = Box::pin(stream);

    while let Some(message) = stream.next().await {
        if let Message::Assistant { message, .. } = message? {
            for block in &message.content {
                if let ContentBlock::Text { text } = block {
                    println!("{}", text);
                }
            }
        }
    }
    Ok(())
}

Examples

# Core functionality
cargo run --example simple_query
cargo run --example convenience_methods
cargo run --example bidirectional_demo
cargo run --example message_queue_demo
cargo run --example session_binding_demo
cargo run --example interactive_client

# Hooks and permissions
cargo run --example hooks_demo
cargo run --example permissions_demo
cargo run --example hooks_lifecycle_test

# Introspection and runtime
cargo run --example introspection_demo
cargo run --example result_fields_demo
cargo run --example runtime_setters_demo

# Security
cargo run --example security_demo

# OAuth authentication
cargo run --example oauth_demo
cargo run --example oauth_demo -- status
cargo run --example oauth_demo -- logout

# Structured output
cargo run --example structured_output_demo

# MCP (requires --features rmcp for mcp_server)
cargo run --example mcp_integration
cargo run --example mcp_server --features rmcp

TypeScript SDK Parity

Hook Events

Event	TypeScript	Rust SDK
PreToolUse	✓	✓
PostToolUse	✓	✓
PostToolUseFailure	✓	✓
Notification	✓	✓
UserPromptSubmit	✓	✓
SessionStart	✓	✓
SessionEnd	✓	✓
Stop	✓	✓
SubagentStart	✓	✓
SubagentStop	✓	✓
PreCompact	✓	✓
PermissionRequest	✓	✓

Query/Client Methods

Method	TypeScript	Rust SDK
interrupt()	✓	✓
setPermissionMode()	✓	✓
setModel()	✓	✓
setMaxThinkingTokens()	✓	✓
supportedCommands()	✓	✓
supportedModels()	✓	✓
mcpServerStatus()	✓	✓
accountInfo()	✓	✓

Options

Option	TypeScript	Rust SDK
allowedTools	✓	✓
disallowedTools	✓	✓
systemPrompt	✓	✓
mcpServers	✓	✓
permissionMode	✓	✓
canUseTool	✓	✓
hooks	✓	✓
agents	✓	✓
maxTurns	✓	✓
model	✓	✓
cwd	✓	✓
env	✓	✓
resume	✓	✓
forkSession	✓	✓
settingSources	✓	✓
maxBudgetUsd	✓	✓
maxThinkingTokens	✓	✓
fallbackModel	✓	✓
outputFormat	✓	✓
sandbox	✓	✓
plugins	✓	✓
betas	✓	✓
strictMcpConfig	✓	✓
resumeSessionAt	✓	✓
allowDangerouslySkipPermissions	✓	✓
pathToClaudeCodeExecutable	✓	✓
stderr	✓	✓
tools (preset)	✓	✓
enableFileCheckpointing	✓	✓
sessionId	✓	✓

MCP Server Types

Type	TypeScript	Rust SDK
stdio	✓	✓
sse	✓	✓
http	✓	✓
sdk (in-process)	✓	✓

Result Message Fields

Field	TypeScript	Rust SDK
modelUsage	✓	✓
permission_denials	✓	✓
structured_output	✓	✓
errors	✓	✓

Development

cargo build
cargo test
cargo clippy
cargo doc --open

Security

The SDK implements strict security measures:

• Environment variables: Dangerous vars (LD_PRELOAD, PATH, etc.) cause errors
• CLI arguments: Only allowlisted flags permitted, others rejected
• Session binding: Auto-binds on first Result, validates on send
• Buffer limits: Configurable max buffer size (default 1MB)
• 100% safe Rust: No unsafe code

See SECURITY.md for full documentation.

OAuth Authentication

For Claude Max/Pro subscribers, authenticate without API keys:

use anthropic_agent_sdk::auth::OAuthClient;

let client = OAuthClient::new()?;
let token = client.authenticate().await?;
// Token is cached in platform-specific config directory

See oauth_demo example for full usage including status check and logout.

Documentation

• README_API.md - Full API reference
• SECURITY.md - Security documentation and threat model

License

MIT

Related

• TypeScript Claude Agent SDK
• Claude Code