AI SDK Provider for Claude Agent SDK

Latest Release: Version 4.x supports AI SDK v7 stable with the Claude Agent SDK. Version 3.x moves to maintenance for AI SDK v6 under the ai-sdk-v6 tag.

ai-sdk-provider-claude-code lets you use Claude via the Vercel AI SDK through the official @anthropic-ai/claude-agent-sdk and the Claude Code CLI.

Version Compatibility

Install commands for each line are listed under Installation below.

Zod Compatibility

The 4.x line requires Zod ^4.1.8. Version 3.x remains available for AI SDK v6 under the ai-sdk-v6 tag.

npm install ai-sdk-provider-claude-code ai zod@^4.1.8

Note: Zod 3 support was dropped in v3.2.0 due to the underlying @anthropic-ai/claude-agent-sdk@0.2.x requiring Zod 4. If you need Zod 3 support, use ai-sdk-provider-claude-code@3.1.x.

Installation

1. Install and authenticate the CLI

See the official docs for platform-specific options.

curl -fsSL https://claude.ai/install.sh | bash
claude auth login

2. Add the provider

# For AI SDK v7 (4.x; current latest tag)
npm install ai-sdk-provider-claude-code ai

# For AI SDK v6 maintenance (3.x)
npm install ai-sdk-provider-claude-code@ai-sdk-v6 ai@^6.0.0

# For AI SDK v5
npm install ai-sdk-provider-claude-code@ai-sdk-v5 ai@^5.0.0

# For AI SDK v4 (legacy)
npm install ai-sdk-provider-claude-code@ai-sdk-v4 ai@^4.3.16
# or use a specific version: npm install ai-sdk-provider-claude-code@^0.2.2

Disclaimer

This is an unofficial community provider and is not affiliated with or endorsed by Anthropic or Vercel. By using this provider:

• You understand that your data will be sent to Anthropic's servers through the Claude Agent SDK
• You agree to comply with Anthropic's Terms of Service
• You acknowledge this software is provided "as is" without warranties of any kind

Please ensure you have appropriate permissions and comply with all applicable terms when using this provider.

Quick Start

AI SDK v7 (latest)

// npm install ai-sdk-provider-claude-code ai
import { streamText } from 'ai';
import { claudeCode } from 'ai-sdk-provider-claude-code';

const result = streamText({
  model: claudeCode('haiku'),
  prompt: 'Hello, Claude!',
});

const text = await result.text;
console.log(text);

AI SDK v6 (maintenance)

// npm install ai-sdk-provider-claude-code@ai-sdk-v6 ai@^6.0.0
import { streamText } from 'ai';
import { claudeCode } from 'ai-sdk-provider-claude-code';

const result = streamText({
  model: claudeCode('haiku'),
  prompt: 'Hello, Claude!',
});

const text = await result.text;
console.log(text);

AI SDK v5

// npm install ai-sdk-provider-claude-code@ai-sdk-v5 ai@^5.0.0
import { streamText } from 'ai';
import { claudeCode } from 'ai-sdk-provider-claude-code';

const result = streamText({
  model: claudeCode('haiku'),
  prompt: 'Hello, Claude!',
});

const text = await result.text;
console.log(text);

Breaking Changes

Version 4.0.0 (AI SDK v7)

This release ports the provider to AI SDK v7 / LanguageModelV4, adds first-class Claude Agent SDK callback, query-controller, MCP, and image support, and keeps the v7 support boundaries explicit:

• Requires Node.js ≥ 22 and Zod ^4.1.8
• ESM-only package output; CommonJS require() is no longer available
• Tool failures now use spec tool-result parts/events with isError: true instead of the provider-specific tool-error stream extension

Optional AI SDK v7 surfaces not implemented

Version 4.0.0 intentionally keeps optional provider surfaces absent unless the Claude Agent SDK has a durable provider-reference mapping:

• ProviderV4.files() is not implemented yet. The AI SDK interface uploads { type: 'data' } or { type: 'text' } bytes and returns a reusable provider reference, but Claude Agent SDK 0.3.205 exposes no direct upload/reuse API for that contract. This provider forwards inline image file parts in prompts; non-image inline files (for example PDFs) emit an unsupported-file call warning and are not forwarded. It does not upload files into durable provider references.
• Canonical V4 tool-result file parts are replayed into conversation history as text markers like [File <name>: <mediaType>]; raw file bytes are not re-sent on replay. Richer tool-result file replay, such as re-sending actual image/file bytes for tool-result file parts, is deferred.
• ProviderV4.skills() is not implemented yet. Claude Code skills are loaded from configured user/project/local skill directories with the existing skills setting below; there is no Agent SDK API that uploads a skill bundle and returns an AI SDK provider reference.
• Workflow serialization is deferred. @ai-sdk/provider-utils@5.0.5 exposes WORKFLOW_SERIALIZE, WORKFLOW_DESERIALIZE, and serializeModelOptions() for provider model classes in the AI SDK v7 stack, but this provider has not added a serialization contract for provider instances or settings. Callback/function settings such as canUseTool, hooks, logger, spawnClaudeCodeProcess, and SessionStore methods are not JSON-serializable and must be recreated by the application.
• V4 custom and reasoning-file parts are not emitted as provider output yet. Claude Agent SDK 0.3.205 has no durable reasoning-file artifact output that maps to AI SDK reasoning-file; assistant-history custom and reasoning-file parts have no Claude Code replay representation and are skipped (unknown unsupported content variants still warn).

Version 3.0.0 (AI SDK v6 Stable)

This version upgrades to AI SDK v6 stable with updated provider types:

• usage.raw now contains raw provider usage (previously in providerMetadata['claude-code'].rawUsage)
• Internal type changes for LanguageModelV3Usage and LanguageModelV3FinishReason (transparent to most users)

Version 2.0.0 (Claude Agent SDK Migration)

This version migrates to @anthropic-ai/claude-agent-sdk with new defaults for better control:

• System prompt is no longer applied by default
• Filesystem settings (CLAUDE.md, settings.json) are no longer loaded by default
• See Migrating to Claude Agent SDK section below for migration details

Version 1.x (AI SDK v5)

See Breaking Changes Guide for details on migrating from v0.x to v1.x.

Key changes:

• Requires AI SDK v5
• New streaming API pattern
• Updated token usage properties
• Changed message types

Models

• fable - Claude Fable (most capable)
• opus - Claude Opus (highly capable)
• sonnet - Claude Sonnet (balanced performance)
• haiku - Claude Haiku (fastest, most cost-effective)

You can also use full model identifiers directly (e.g., claude-fable-5, claude-sonnet-4-6, claude-opus-4-8).

Documentation

• Session Management - Creating, resuming, forking, inspecting, and deleting sessions
• Examples - Sample scripts and patterns
• Usage Guide - Comprehensive examples and configuration (written for provider 2.x / AI SDK v5; most patterns still apply)
• Troubleshooting - Common issues and solutions (written for provider 2.x / AI SDK v5)
• Tool Streaming Support - Event semantics and performance notes (written for provider 2.x / AI SDK v5)
• Breaking Changes - v0.x to v1.x migration guide (historical)

The docs/ai-sdk-v4/ and docs/ai-sdk-v5/ directories cover legacy provider versions (0.x and 1.x–2.x respectively) and are kept for reference.

Migrating to Claude Agent SDK (v2.0.0)

Version 2.0.0 migrates from @anthropic-ai/claude-code to @anthropic-ai/claude-agent-sdk. Two defaults changed:

• System prompt is no longer applied by default.
• Filesystem settings (CLA