---
title: "Claude Code v2.1.231 Fixes MCP OAuth Sign-in Compatibility Issue"
source: "Claude Code：GitHub Releases（RSS）"
source_tier: "t1_5"
url: "https://github.com/anthropics/claude-code/releases/tag/v2.1.231"
permalink: "https://feed.astralor.com/items/itm_91de49cd54d71d5346b7c2fa"
published: "2026-08-13T08:38:50.000Z"
score: 73
channel: "ai"
tags: ["Anthropic","Claude Code","MCP","OAuth","Slack"]
---

# Claude Code v2.1.231 Fixes MCP OAuth Sign-in Compatibility Issue

## AI commentary

> This update may be a small patch, but for developers who have been struggling with MCP integration, it could be just the fix they were waiting for. Those frustrated by Slack OAuth redirect issues will save time troubleshooting after upgrading. As part of the developer toolchain, Claude Code's attention to such details is worth noting.

## At a glance

Claude Code, Anthropic's agentic coding tool, has shipped version 2.1.231. The release fixes an issue where MCP OAuth sign-in would fail with a redirect URI mismatch for servers that rely on a pre-registered OAuth client, such as Slack. This fix addresses compatibility when connecting to external services that have strict OAuth configuration, ensuring that the authentication flow now correctly matches the registered URI. Developers using MCP-based integrations with Slack or similar services should upgrade to this version to avoid login failures. The change is targeted but meaningful, reinforcing the stability of Claude Code's ecosystem and its support for standard authentication mechanisms.

## Key points

- Fixes redirect URI mismatch that caused MCP OAuth sign-in failures with pre-registered clients.
- Addresses compatibility for external services like Slack with strict OAuth configurations.
- Developers should upgrade to v2.1.231 to resolve authentication errors.
- The patch strengthens the stability of Claude Code's third-party integrations.

## Full text

What's changed Fixed MCP OAuth sign-in failing with a redirect URI mismatch for servers that use a pre-registered OAuth client, such as Slack

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