# Migrate to Claude Agent SDK

> Guide for migrating the Claude Code TypeScript and Python SDKs to the Claude Agent SDK

## Overview

The Claude Code SDK has been renamed to the **Claude Agent SDK** and its documentation has been reorganized. This change reflects the SDK's broader capabilities for building AI agents beyond just coding tasks.

## What's Changed

| Aspect                     | Old                            | New                              |
| :------------------------- | :----------------------------- | :------------------------------- |
| **Package Name (TS/JS)**   | `@anthropic-ai/claude-code`    | `@anthropic-ai/claude-agent-sdk` |
| **Python Package**         | `claude-code-sdk`              | `claude-agent-sdk`               |
| **Documentation Location** | Claude Code docs → SDK section | API Guide → Agent SDK section    |

<Note>
  **Documentation Changes:** The Agent SDK documentation has moved from the Claude Code docs to the API Guide under a dedicated [Agent SDK](/en/api/agent-sdk/overview) section. The Claude Code docs now focus on the CLI tool and automation features.
</Note>

## Migration Steps

### For TypeScript/JavaScript Projects

**1. Uninstall the old package:**

```bash  theme={null}
npm uninstall @anthropic-ai/claude-code
```

**2. Install the new package:**

```bash  theme={null}
npm install @anthropic-ai/claude-agent-sdk
```

**3. Update your imports:**

Change all imports from `@anthropic-ai/claude-code` to `@anthropic-ai/claude-agent-sdk`:

```typescript  theme={null}
// Before
import { query, tool, createSdkMcpServer } from "@anthropic-ai/claude-code";

// After
import {
  query,
  tool,
  createSdkMcpServer,
} from "@anthropic-ai/claude-agent-sdk";
```

**4. Update package.json dependencies:**

If you have the package listed in your `package.json`, update it:

```json  theme={null}
// Before
{
  "dependencies": {
    "@anthropic-ai/claude-code": "^1.0.0"
  }
}

// After
{
  "dependencies": {
    "@anthropic-ai/claude-agent-sdk": "^0.1.0"
  }
}
```

That's it! No other code changes are required.

### For Python Projects

**1. Uninstall the old package:**

```bash  theme={null}
pip uninstall claude-code-sdk
```

**2. Install the new package:**

```bash  theme={null}
pip install claude-agent-sdk
```

**3. Update your imports:**

Change all imports from `claude_code_sdk` to `claude_agent_sdk`:

```python  theme={null}
# Before
from claude_code_sdk import query, ClaudeCodeOptions

# After
from claude_agent_sdk import query, ClaudeAgentOptions
```

**4. Update type names:**

Change `ClaudeCodeOptions` to `ClaudeAgentOptions`:

```python  theme={null}
# Before
from claude_agent_sdk import query, ClaudeCodeOptions

options = ClaudeCodeOptions(
    model="claude-sonnet-4-5"
)

# After
from claude_agent_sdk import query, ClaudeAgentOptions

options = ClaudeAgentOptions(
    model="claude-sonnet-4-5"
)
```

**5. Review [breaking changes](#breaking-changes)**

Make any code changes needed to complete the migration.

## Breaking changes

<Warning>
  To improve isolation and explicit configuration, Claude Agent SDK v0.1.0 introduces breaking changes for users migrating from Claude Code SDK. Review this section carefully before migrating.
</Warning>

### Python: ClaudeCodeOptions renamed to ClaudeAgentOptions

**What changed:** The Python SDK type `ClaudeCodeOptions` has been renamed to `ClaudeAgentOptions`.

**Migration:**

```python  theme={null}
# BEFORE (v0.0.x)
from claude_agent_sdk import query, ClaudeCodeOptions

options = ClaudeCodeOptions(
    model="claude-sonnet-4-5",
    permission_mode="acceptEdits"
)

# AFTER (v0.1.0)
from claude_agent_sdk import query, ClaudeAgentOptions

options = ClaudeAgentOptions(
    model="claude-sonnet-4-5",
    permission_mode="acceptEdits"
)
```

**Why this changed:** The type name now matches the "Claude Agent SDK" branding and provides consistency across the SDK's naming conventions.

### System prompt no longer default

**What changed:** The SDK no longer uses Claude Code's system prompt by default.

**Migration:**

<CodeGroup>
  ```typescript TypeScript theme={null}
  // BEFORE (v0.0.x) - Used Claude Code's system prompt by default
  const result = query({ prompt: "Hello" });

  // AFTER (v0.1.0) - Uses empty system prompt by default
  // To get the old behavior, explicitly request Claude Code's preset:
  const result = query({
    prompt: "Hello",
    options: {
      systemPrompt: { type: "preset", preset: "claude_code" }
    }
  });

  // Or use a custom system prompt:
  const result = query({
    prompt: "Hello",
    options: {
      systemPrompt: "You are a helpful coding assistant"
    }
  });
  ```

  ```python Python theme={null}
  # BEFORE (v0.0.x) - Used Claude Code's system prompt by default
  async for message in query(prompt="Hello"):
      print(message)

  # AFTER (v0.1.0) - Uses empty system prompt by default
  # To get the old behavior, explicitly request Claude Code's preset:
  from claude_agent_sdk import query, ClaudeAgentOptions

  async for message in query(
      prompt="Hello",
      options=ClaudeAgentOptions(
          system_prompt={"type": "preset", "preset": "claude_code"}  # Use the preset
      )
  ):
      print(message)

  # Or use a custom system prompt:
  async for message in query(
      prompt="Hello",
      options=ClaudeAgentOptions(
          system_prompt="You are a helpful coding assistant"
      )
  ):
      print(message)
  ```
</CodeGroup>

**Why this changed:** Provides better control and isolation for SDK applications. You can now build agents with custom behavior without inheriting Claude Code's CLI-focused instructions.

### Settings Sources No Longer Loaded by Default

**What changed:** The SDK no longer reads from filesystem settings (CLAUDE.md, settings.json, slash commands, etc.) by default.

**Migration:**

<CodeGroup>
  ```typescript TypeScript theme={null}
  // BEFORE (v0.0.x) - Loaded all settings automatically
  const result = query({ prompt: "Hello" });
  // Would read from:
  // - ~/.claude/settings.json (user)
  // - .claude/settings.json (project)
  // - .claude/settings.local.json (local)
  // - CLAUDE.md files
  // - Custom slash commands

  // AFTER (v0.1.0) - No settings loaded by default
  // To get the old behavior:
  const result = query({
    prompt: "Hello",
    options: {
      settingSources: ["user", "project", "local"]
    }
  });

  // Or load only specific sources:
  const result = query({
    prompt: "Hello",
    options: {
      settingSources: ["project"]  // Only project settings
    }
  });
  ```

  ```python Python theme={null}
  # BEFORE (v0.0.x) - Loaded all settings automatically
  async for message in query(prompt="Hello"):
      print(message)
  # Would read from:
  # - ~/.claude/settings.json (user)
  # - .claude/settings.json (project)
  # - .claude/settings.local.json (local)
  # - CLAUDE.md files
  # - Custom slash commands

  # AFTER (v0.1.0) - No settings loaded by default
  # To get the old behavior:
  from claude_agent_sdk import query, ClaudeAgentOptions

  async for message in query(
      prompt="Hello",
      options=ClaudeAgentOptions(
          setting_sources=["user", "project", "local"]
      )
  ):
      print(message)

  # Or load only specific sources:
  async for message in query(
      prompt="Hello",
      options=ClaudeAgentOptions(
          setting_sources=["project"]  # Only project settings
      )
  ):
      print(message)
  ```
</CodeGroup>

**Why this changed:** Ensures SDK applications have predictable behavior independent of local filesystem configurations. This is especially important for:

* **CI/CD environments** - Consistent behavior without local customizations
* **Deployed applications** - No dependency on filesystem settings
* **Testing** - Isolated test environments
* **Multi-tenant systems** - Prevent settings leakage between users

<Note>
  **Backward compatibility:** If your application relied on filesystem settings (custom slash commands, CLAUDE.md instructions, etc.), add `settingSources: ['user', 'project', 'local']` to your options.
</Note>

## Why the Rename?

The Claude Code SDK was originally designed for coding tasks, but it has evolved into a powerful framework for building all types of AI agents. The new name "Claude Agent SDK" better reflects its capabilities:

* Building business agents (legal assistants, finance advisors, customer support)
* Creating specialized coding agents (SRE bots, security reviewers, code review agents)
* Developing custom agents for any domain with tool use, MCP integration, and more

## Getting Help

If you encounter any issues during migration:

**For TypeScript/JavaScript:**

1. Check that all imports are updated to use `@anthropic-ai/claude-agent-sdk`
2. Verify your package.json has the new package name
3. Run `npm install` to ensure dependencies are updated

**For Python:**

1. Check that all imports are updated to use `claude_agent_sdk`
2. Verify your requirements.txt or pyproject.toml has the new package name
3. Run `pip install claude-agent-sdk` to ensure the package is installed

See the [Troubleshooting](/en/docs/claude-code/troubleshooting) guide for common issues.

## Next Steps

* Explore the [Agent SDK Overview](/en/api/agent-sdk/overview) to learn about available features
* Check out the [TypeScript SDK Reference](/en/api/agent-sdk/typescript) for detailed API documentation
* Review the [Python SDK Reference](/en/api/agent-sdk/python) for Python-specific documentation
* Learn about [Custom Tools](/en/api/agent-sdk/custom-tools) and [MCP Integration](/en/api/agent-sdk/mcp)