`@anvia/anthropic`

Anthropic’s provider adapter supplies streaming Claude completion models for Anvia agents, direct completions, extractors, and pipelines. It supports Anthropic’s API, compatible Messages endpoints, and Claude on Google Vertex AI.


Support	First-party
Version	`0.5.1`
Runtime	ESM, server-side JavaScript
Peer	`@anvia/core >=0.7.1 <1.0.0`

Install

bash

pnpm add @anvia/anthropic @anvia/core

Create a Claude agent

import { AgentBuilder } from '@anvia/core'
import { AnthropicClient } from '@anvia/anthropic'

const anthropic = new AnthropicClient({
  apiKey: process.env.ANTHROPIC_API_KEY,
})

const agent = new AgentBuilder(
  'assistant',
  anthropic.completionModel('claude-sonnet-4-20250514'),
)
  .instructions('Give direct, well-supported answers.')
  .build()

const result = await agent.prompt('Summarize the release notes.').send()
console.log(result.output)

Capabilities

Capability	Support
Completion and streaming	Yes
Tools and structured output	Yes
Text and image message content	Yes
Model listing	Anthropic API client only
Vertex AI	Dedicated client
Embeddings and media generation	No

The package maps Anvia history, documents, tools, tool results, reasoning, streaming events, and usage to Anthropic Messages. It intentionally does not pretend that Anthropic exposes Anvia embedding or media model contracts.

Common patterns

Use an Anthropic-compatible endpoint

const compatible = new AnthropicClient({
  apiKey: process.env.PROVIDER_API_KEY,
  baseUrl: 'https://provider.example.com',
})

const model = compatible.completionModel('provider/model-name')

Run Claude through Vertex AI

import { AnthropicVertexClient } from '@anvia/anthropic'

const vertex = new AnthropicVertexClient({
  projectId: 'my-gcp-project',
  region: 'global',
})

const model = vertex.completionModel('claude-sonnet-5')

The Vertex client follows Google authentication through the official Anthropic Vertex SDK. It can use Application Default Credentials or explicit SDK authentication options, but it does not expose listModels() because Vertex does not provide Anthropic’s Models API.

Compatibility

@anvia/anthropic is ESM and depends on the official Anthropic and Anthropic Vertex SDKs. AnthropicClient accepts a preconfigured Anthropic client. AnthropicVertexClientOptions extends the official Vertex ClientOptions, so transport and authentication compatibility follow that SDK.

@anvia/anthropic ​

Install ​

Create a Claude agent ​

Capabilities ​

Common patterns ​

Use an Anthropic-compatible endpoint ​

Run Claude through Vertex AI ​

Compatibility ​

Continue ​