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Anthropic API Anthropic API Updated May 11, 2026

Claude.ai MCP Connector Authorization Failed After OAuth Completes

Fix claude.ai MCP connector showing 'Authorization with the MCP server failed' after OAuth completes successfully Includes evidence for Anthropic API troubleshooting demand.

Authorization with the MCP server failed
Anthropic API Anthropic API Updated May 11, 2026

Fix Anthropic API 529 Overloaded Error

Fix Anthropic API 529 overloaded responses with safe retry backoff, lower concurrency, and provider-capacity checks.

Anthropic API 529 Overloaded