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Fix Claude Code failing to authenticate with GitHub's remote MCP server; resolve Dynamic Client Registration failures and configure PAT fallback or new OAuth app Includes evidence for Claude Code troubleshooting demand.
Claude Code cannot connect to GitHub's remote MCP server using OAuth; Dynamic Client Registration not supported Resolve Claude Code forcing OAuth2 DCR flow even when MCP server has pre-configured Bearer token via Authorization header — causes unexpected authentication redirects for existing API-based MCP servers Includes evidence for Claude Code troubleshooting demand.
Claude Code attempts OAuth2 Dynamic Client Registration despite the MCP being configured with an Authorization header Fix Claude Code MCP OAuth authentication that times out every 5 minutes because offline_access scope is never requested, preventing refresh token issuance Includes evidence for Claude Code troubleshooting demand.
Fetched OAuth metadata with scope: NONE; No scopes stored to add to token request!; authentication timeouts every 5 minutes Fix Claude Desktop and claude.ai web interface failing to initiate OAuth flow for custom MCP servers — browser stays on about:blank creating infinite reconnect loop, while Claude Code CLI works fine Includes evidence for Claude Code troubleshooting demand.
Browser opens to about:blank; 'Open Claude?' dialog appears immediately; There was an error connecting to [ServerName] Fix MCP servers requiring OAuth authentication not exposing their tools to Claude Code session — tools invisible despite server showing connected Includes evidence for Claude Code troubleshooting demand.
No such tool available: mcp__azure-devops__core_list_projects Resolve Claude Code 403 and 529 API errors that block code generation and AI-assisted development workflows Includes evidence for Claude Code troubleshooting demand.
Claude Code 403 Forbidden / 529 Too Many Connections when calling Anthropic API Fix Claude Desktop/claude.ai OAuth MCP connection failure where about:blank opens instead of redirecting to the OAuth authorization server Includes evidence for Claude Code troubleshooting demand.
[BUG] Claude Desktop and claude.ai fail to connect to custom OAuth-protected MCP server — opens about:blank page instead of authorization endpoint; infinite 'Open Claude?' dialog loop Fix M365 MCP server authorization failure in Claude Desktop despite having admin consent and correct Entra login Includes evidence for Claude Code troubleshooting demand.
Authorization with the MCP server failed. You can check your credentials and permissions Fix Claude Code OAuth 2.1 + AWS Cognito token exchange failure for MCP server connections Includes evidence for Claude Code troubleshooting demand.
mcp_token_exchange_failed against OAuth 2.1 + Cognito stack Recover from Claude Code session lockout caused by mid-run OAuth token expiry that prevents any further tool calls Includes evidence for Claude Code troubleshooting demand.
authentication_error — every subsequent tool call returns 401 after OAuth token expires mid-autonomous run Fix Claude Code hanging indefinitely when Server-Sent Events (SSE) stream drops during MCP tool calls, causing no automatic retry or failure notification Includes evidence for Claude Code troubleshooting demand.
silently hangs MCP tool calls after SSE drop; does not fail or reconnect Fix Claude Desktop settings file collision causing EACCES crashes in multi-user macOS environments due to missing UID namespacing Includes evidence for Claude Code troubleshooting demand.
EACCES permission denied; /tmp/claude-settings-<hash>.json not UID-namespaced; Claude Code panel crashes on second macOS user Fix duplicate 'prompt' parameter generation in OAuth flow when using Microsoft 365 connector integration with Claude Code Includes evidence for Claude Code troubleshooting demand.
OAuth generates duplicate prompt parameter in Microsoft 365 connector Fix excessive context consumption caused by eagerly loading full MCP tool schemas and skill listings into subagent context budget Includes evidence for Claude Code troubleshooting demand.
Context budget exhausted / blown by eagerly-materialized MCP tool schemas and skill listing Fix Claude Code stuck in auth loop after token revocation; cannot refresh OAuth session via /login command Includes evidence for Claude Code troubleshooting demand.
OAuth token revoked → run /login; OAuth Request Failed / Internal server error during re-authentication Fix MCP server OAuth authentication failures where valid configs work in Claude Code client but fail on specific third-party MCP servers (e.g., Datadog invalid_scope) Includes evidence for Claude Code troubleshooting demand.
Datadog MCP OAuth fails with invalid_scope error (works in Claude Code with identical config) Fix MCP filesystem server ENOENT error in Claude Desktop where Windows absolute paths get mangled during npx-based server launch Includes evidence for Claude Code troubleshooting demand.
ENOENT: no such file or directory, stat 'C:\Users\...'. Error accessing directory — MCP filesystem server path resolution bug between Windows paths and npx cross-platform execution Fix MCP -32001 timeout error when Claude Desktop loses connection to custom Node.js/Express MCP server after initial handshake Includes evidence for Claude Code troubleshooting demand.
McpError: MCP error -32001: Request timed out Debug why custom MCP server built in C#/.NET exits immediately after successful initialization when connecting to Claude Desktop — find proper JSON-RPC 2.0 lifecycle handling Includes evidence for Claude Code troubleshooting demand.
MCP server launches correctly and sends valid initialize response over stdin/stdout, but Claude connection closes immediately afterward with logs showing server started and connected then disconnect Paid Claude Code user cannot select or access Opus 4.7 standard model via VS Code extension — likely a platform-specific availability bug blocking paid tier usage Includes evidence for Claude Code troubleshooting demand.
Opus 4.7 standard unavailable in VS Code extension