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Claude Code v2.1.231 Fixes MCP OAuth Sign-in Failures for Servers Like Slack

Claude Code Release ★★ View Markdown
#anthropic#devops#security

Hey everyone, it's Shiichan! There's a new Claude Code release out, so let's take a quick look.

Claude Code Release github.com

What was announced?

According to the Claude Code Release notes on GitHub, v2.1.231 just shipped. This release lists just one change: a fix for MCP OAuth sign-in failing with a redirect URI mismatch on servers that use a pre-registered OAuth client, such as Slack.

The story so far

Some MCP servers, like Slack, use an OAuth client that's registered ahead of time, with a fixed callback redirect URI on the server side. When Claude Code tried to complete OAuth sign-in against a server like that, the redirect URI it used could mismatch the one already registered on the server, causing sign-in to fail partway through.

What changes

With this fix, sign-in now completes successfully against MCP servers that use a pre-registered OAuth client, without the redirect URI mismatch. If your team was hitting auth errors connecting Claude Code to a server like Slack, updating should clear that up.

Wrap-up

  • Claude Code v2.1.231 has been released
  • Fixed MCP OAuth sign-in failing with a redirect URI mismatch for servers with a pre-registered OAuth client (like Slack)
  • If you connect to one of these MCP servers, it's worth updating!

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