# Claude Code 2.1.231: MCP OAuth redirect URI fix

> Fixes MCP OAuth sign-in failing with a redirect URI mismatch for servers that use a pre-registered OAuth client (e.g. Slack).

| | |
|---|---|
| **Tool** | Claude Code |
| **Version** | 2.1.231 |
| **Kind** | release |
| **Published** | 2026-08-13 |
| **Observed** | 2026-08-21 |
| **Significance** | 2/5 |
| **Breaking** | no |
| **Categories** | fix |

## What changed


- Fixed MCP OAuth sign-in redirect URI mismatch for servers using a pre-registered OAuth client such as Slack.


## Sources

- [changelog_md](https://github.com/anthropics/claude-code/blob/main/CHANGELOG.md) — retrieved 2026-08-21


## Community

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---
Canonical: https://changelogs.info/claude-code/2-1-231
Entity: https://changelogs.info/claude-code
Event ID: `evt_2026-08-13_claude-code_2-1-231`
Licence: event synthesis © changelogs.info, CC BY 4.0. Linked sources belong to their vendors.