Claude Code Major Update: Remote MCP Server Support, Plan Mode, and SDK Launch

Anthropic announced the addition of three important new features to Claude Code in June 2025. Remote MCP server support, plan mode implementation, and TypeScript and Python SDK provision aim to enhance developer productivity.

Remote MCP Server Support for Seamless External Tool Integration

The most notable update to Claude Code is support for remote MCP (Model Context Protocol) servers¹. External tool integration, which previously required local server management, can now be easily achieved through remote servers.

Sentry and Linear Integration Now Available

As initial support, integration with error monitoring service Sentry and project management tool Linear is now possible. With Sentry integration, you can access error and issue information and debug using contextual information without leaving the terminal. Linear integration allows you to handle projects and issues directly within Claude Code, enabling seamless transitions between planning, coding, and issue management workflows.

Setup is simple - just add the vendor’s URL to Claude Code. OAuth-based secure connections are natively supported, and once authenticated, you can use them continuously. Updates, scaling, and availability management are handled by the vendor side, allowing developers to focus on their primary work.

Plan Mode for Reviewing Plans Before Implementation

The second new feature, Plan Mode, is activated by pressing Shift+Tab twice². In this mode, Claude does not write to the file system and uses only read-only tools to conduct research and planning.

The main benefits of Plan Mode are as follows:

• Safety and Control: No need to guess whether files will be edited or just suggested; you can approve before execution
• Consistent Format: Provides structured, predictable responses with appropriate detail levels
• Performance: Operates at high speed, and the generated plans are compact, significantly improving Opus model usage efficiency
• Structured Responses: Presents multiple options in numbered format, clearly showing the advantages of each approach (speed differences, required changes, etc.)

When exiting Plan Mode, additional confirmation is requested for tasks to be executed, enabling more careful work.

TypeScript and Python SDKs Provided

As the third new feature, SDKs for TypeScript and Python have been released³. This allows developers to incorporate Claude Code functionality into their own applications.

TypeScript SDK

Provided as the NPM package @anthropic-ai/claude-code, it can be used with concise code like the following:

import { query, type SDKMessage } from "@anthropic-ai/claude-code";

const messages: SDKMessage[] = [];
for await (const message of query({
  prompt: "Write a haiku about foo.py",
  abortController: new AbortController(),
  options: { maxTurns: 3 }
})) {
  messages.push(message);
}

Python SDK

Provided as the PyPI package claude-code-sdk. Requires Python 3.10 or higher, Node.js, and Claude Code CLI:

import anyio
from claude_code_sdk import query, ClaudeCodeOptions, Message

async def main():
    messages: list[Message] = []
    async for message in query(
        prompt="Write a haiku about foo.py",
        options=ClaudeCodeOptions(max_turns=3)
    ):
        messages.append(message)
    print(messages)

anyio.run(main)

Both SDKs support features such as non-interactive mode, multi-turn conversations, custom system prompts, MCP configuration, flexible input/output formats, and conversation resumption.

Update Method and Future Prospects

These new features are available to all Claude Code users. You can update to the latest version by running the claude update && claude command.

Anthropic states that the MCP server ecosystem continues to grow and new features will be continuously added. With this update, Claude Code has evolved from a simple coding assistant to an integrated development environment that supports developers’ entire workflow.

Sources

1. Claude Code now supports remote MCP servers - Anthropic Official Blog (Remote MCP server support details)
2. ClaudeLog - Plan Mode - Claude Code plan mode feature details
3. Claude Code SDK Documentation - Anthropic Official Documentation (SDK specifications)