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Claude Code 2.1.231 Fixes an MCP OAuth Bug Specific to Slack-Style Servers

2026-08-21 ยท source:

Claude Code 2.1.231 fixes MCP OAuth sign-in failing with a redirect URI mismatch for servers using a pre-registered OAuth client, such as Slack's.

What it is

The v2.1.231 patch release of Claude Code, Anthropic's CLI coding agent.

What it does

It fixes MCP OAuth sign-in failing with a redirect URI mismatch specifically for MCP servers that require a pre-registered OAuth client rather than dynamic client registration, with Slack cited as the example case.

Why it matters

MCP servers that use pre-registered OAuth clients instead of dynamic registration are common for enterprise SaaS integrations, so a redirect mismatch there silently blocked a whole class of connections until this fix.

How to use it

Update to Claude Code 2.1.231 or later and retry MCP OAuth sign-in against servers like Slack that use a fixed, pre-registered OAuth client.

Go to source →
claude-codemcpoauthrelease-notes
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