AI SDK - Claude Agent SDK Provider

The ai-sdk-claude-agent-provider package provides a Claude Agent SDK-backed provider for the AI SDK, using @anthropic-ai/claude-agent-sdk under the hood.

Setup

Install the provider with ai:

npm i ai-sdk-claude-agent-provider ai

Skill for Coding Agents

If you use coding agents such as Claude Code or Cursor, we recommend adding the AI SDK skill to your repository:

npx skills add vercel/ai

Provider Instance

Import the default provider instance claudeAgentSdk:

import { claudeAgentSdk } from "ai-sdk-claude-agent-provider";

Or create a customized provider instance:

import { createClaudeAgentSdk } from "ai-sdk-claude-agent-provider";

const provider = createClaudeAgentSdk({
  name: "claude-agent-sdk",
  apiKey: process.env.ANTHROPIC_API_KEY,
  baseURL: process.env.ANTHROPIC_BASE_URL,
  queryOptions: {
    cwd: process.cwd(),
    permissionMode: "default",
    settingSources: ["project", "local"],
  },
});

Example

import { claudeAgentSdk } from "ai-sdk-claude-agent-provider";
import { generateText } from "ai";

const { text } = await generateText({
  model: claudeAgentSdk("default"),
  prompt: "Summarize the repository state in one paragraph.",
});

console.log(text);

Notes

• This provider targets LanguageModelV3 only.
• AI SDK tools are ignored by the provider because Claude Agent SDK manages tool execution internally.
• Provider-executed tool activity is surfaced through stream events (tool-call, tool-result) when available from SDK messages.
• Authentication can be supplied via provider settings (apiKey, authToken) or by pre-configured Claude Agent CLI environment.
• claudeAgentSdkModelIds is a non-exhaustive convenience list and may include aliases like default, sonnet, haiku.
• For canonical model IDs used at runtime (for example claude-opus-4-6), read providerMetadata["claude-agent-sdk"].resolvedModelId / resolvedModelIds on results.
• Use runtime discovery for low-maintenance model coverage:

import { listClaudeAgentSdkModels } from "ai-sdk-claude-agent-provider";

const models = await listClaudeAgentSdkModels({
  apiKey: process.env.ANTHROPIC_API_KEY,
});

console.log(models.map((model) => model.value));

To regenerate the static model id/info files from your current Claude Agent SDK account:

bun --cwd packages/ai-sdk-claude-agent-provider run sync:model-catalog

Option Coverage

Audited against @anthropic-ai/[email protected].

• Options support: all Claude Agent SDK Options fields are supported through the adapter, with four fields mapped from AI SDK primitives instead of direct passthrough:
  • prompt comes from AI SDK prompt/messages.
  • model comes from the selected model id (claudeAgentSdk("<model-id>")).
  • abortController comes from AI SDK abortSignal.
  • outputFormat comes from AI SDK JSON responseFormat.schema (mapped to json_schema; responseFormat.name/description map to schema title/description when missing).
• Pass-through layers for all other Claude Options fields:
  • Provider defaults: createClaudeAgentSdk({ queryOptions: ... })
  • Model defaults: claudeAgentSdk(modelId, modelSettings)
  • Per-call overrides: providerOptions["<provider-name>"]
• Provider convenience aliases: apiKey, authToken, baseURL/baseUrl, and env are merged into Claude process env (ANTHROPIC_API_KEY, ANTHROPIC_AUTH_TOKEN, ANTHROPIC_BASE_URL). If both baseURL and baseUrl are provided, baseURL wins.
• Provider options lookup supports both providerOptions["claude-agent-sdk"] (canonical key) and providerOptions["<provider-name>"] (custom provider name). If both are present, custom-key values override canonical values.

AI SDK call options currently not forwarded to Claude Agent SDK (warnings emitted):

• tools, toolChoice
• headers
• temperature, topP, topK
• maxOutputTokens
• stopSequences
• presencePenalty, frequencyPenalty
• seed

Documentation

• AI SDK community custom provider guide: https://ai-sdk.dev/providers/community-providers/custom-providers
• Claude Agent SDK docs: https://platform.claude.com/docs/en/agent-sdk/overview