Crate agentkit_provider_anthropic 

Anthropic Messages API adapter for the agentkit agent loop.

This crate implements the agentkit ModelAdapter directly against Anthropic’s /v1/messages endpoint. The API is not OpenAI-compatible (different message shape, system is top-level, tool results live as content blocks inside user messages, etc.), so the generic completions adapter is not reused.

Streaming is on by default: the adapter consumes Anthropic’s SSE response and yields ModelTurnEvents as tokens arrive. Call [AnthropicConfig::with_streaming(false)] to opt out in favour of a single buffered request.

Quick start

use agentkit_loop::{Agent, SessionConfig};
use agentkit_provider_anthropic::{AnthropicAdapter, AnthropicConfig};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = AnthropicConfig::from_env()?;
    let adapter = AnthropicAdapter::new(config)?;
    let agent = Agent::builder().model(adapter).build()?;
    let _driver = agent.start(SessionConfig::new("demo")).await?;
    Ok(())
}

Structs

AnthropicAdapter

Model adapter that connects the agentkit agent loop to the Anthropic Messages API.

AnthropicConfig

Configuration for connecting to the Anthropic Messages API.

AnthropicMcpServer

MCP server descriptor passed through to Anthropic’s mcp_servers array.

AnthropicSession

An active session with the Anthropic Messages API.

AnthropicTurn

A turn in progress against the Messages API.

BashCodeExecutionTool

Anthropic server-side bash execution sandbox.

CodeExecutionTool

Anthropic server-side Python code execution sandbox.

RawServerTool

Passthrough wrapper for any server tool Anthropic has shipped but this crate has not yet added first-class support for.

TextEditorCodeExecutionTool

Anthropic server-side text editor sandbox.

WebFetchTool

Anthropic server-side web fetch.

WebSearchTool

Anthropic server-side web search.

Enums

AnthropicError

Errors produced by the Anthropic adapter.

OutputEffort

Relative reasoning effort hint.

OutputFormat

Structured output format constraint.

ServiceTier

Priority/standard routing hint.

ThinkingConfig

Extended thinking configuration.

ToolChoice

Constraint applied to the model’s tool-choice behaviour.

Constants

DEFAULT_ANTHROPIC_VERSION

Default anthropic-version header.

DEFAULT_BASH_EXECUTION_VERSION

The default type version string for BashCodeExecutionTool.

DEFAULT_CODE_EXECUTION_VERSION

The default type version string for CodeExecutionTool.

DEFAULT_ENDPOINT

Default Messages API endpoint.

DEFAULT_TEXT_EDITOR_EXECUTION_VERSION

The default type version string for TextEditorCodeExecutionTool.

DEFAULT_WEB_FETCH_VERSION

The default type version string for WebFetchTool.

DEFAULT_WEB_SEARCH_VERSION

The default type version string for WebSearchTool.

Traits

ServerTool

A server-side tool definition appended to the tools array of a Messages API request.

Functions

boxed

Wraps any ServerTool as an Arc so it can live in AnthropicConfig.

Type Aliases

ServerToolHandle

Convenience alias for an owned, clonable handle to a ServerTool.