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Understand and fix MCP -32000 errors in Claude Code where external tool servers crash on startup; users need to identify root causes like missing dependencies, wrong Node version, or stdout corruption Includes evidence for Claude Code troubleshooting demand.
MCP -32000 (JSON-RPC generic server-error) with 'Connection closed' — MCP server process crashes during launch or initialization Fix GitHub MCP OAuth authentication failure in Claude Code web sessions (claude.ai/code) where the authorization URL routes to the deprecated Google Drive MCP install page Includes evidence for Claude Code troubleshooting demand.
HTTP 403 / Server Turned Down — GitHub MCP OAuth flow lands on api.anthropic.com/mcp/gdrive/google/install instead of GitHub consent screen Repair Claude Code session state corruption where post-compaction request construction injects system-role message into messages array, making session permanently unrecoverable without /clear Includes evidence for Claude Code troubleshooting demand.
API Error: 400 role 'system' is not supported on this model — client builds malformed request after large twice-compacted session Fix Claude Desktop and claude.ai failing to establish OAuth flow for custom MCP servers despite all endpoints being spec-compliant and tested with curl Includes evidence for Claude Code troubleshooting demand.
OAuth flow never initiates — browser opens to about:blank, prompts to reopen Claude Desktop, creating infinite loop; web UI shows 'There was an error connecting...' Resolve GitHub-hosted MCP OAuth authentication failure exclusively in Claude Code web (claude.ai/code) sessions while desktop variant succeeds Includes evidence for Claude Code troubleshooting demand.
GitHub MCP OAuth flow fails specifically in claude.ai/code web sessions — standard Desktop CLI OAuth works but web-hosted sessions cannot complete GitHub authentication Fix Claude Code MCP servers timing out post-OAuth handshake, where authentication succeeds but the SSE stream becomes unreachable Includes evidence for Claude Code troubleshooting demand.
MCP server HTTP/SSE connection times out immediately after OAuth authentication completes successfully — successful login followed by unreachable SSE endpoint 在 VSCode 中使用 Claude Code 扩展配合 chrome-devtools-mcp 时，每次操作都需手动批准权限请求，严重影响工作流效率，用户需要配置静默自动授权 Includes evidence for Claude Code troubleshooting demand.
chrome-devtools-mcp keeps asking permissions repeatedly — no way to auto-allow in .claude/settings.json 开发者在 Claude Code 中集成 Supabase MCP Server 时反复遇到 Unauthorized 错误，导致 AI 代理无法读取数据库配置进行代码生成 Includes evidence for Claude Code troubleshooting demand.
MCP server filesystem connection fails — Unauthorized error on Supabase MCP connector Claude Code 用户在 Fast Mode 下因 Cloudflare 524 连接中断导致静默退出，需了解如何处理和恢复会话 Includes evidence for Claude Code troubleshooting demand.
Fast mode unavailable: Fast ... Cloudflare terminates connection with 524 error → Silent session exit with resume link Fix Claude Code binary crashing on startup when run from VS Code integrated terminal or extension, while working fine in standalone Terminal.app Includes evidence for Claude Code troubleshooting demand.
error: An unknown error occurred (Unexpected) — exit code 1, crash ~8ms after spawn from VS Code parent process Find solution to refresh/reconnect MCP tools in an active Claude Code Remote Control session without killing the entire session Includes evidence for Claude Code troubleshooting demand.
/mcp isn't available over Remote Control; in-session tool list frozen at boot-time snapshot after MCP server restart Resolve Claude Code subprocess timeout during initialization caused by auth failure or network connectivity issues Includes evidence for Claude Code troubleshooting demand.
Subprocess initialization did not complete within 60000ms — check authentication and network connectivity Make LangChain tool calling work together with OpenAI's structured output feature; resolve incompatibility between tool definitions and response_format=JSON_OBJECT Includes evidence for OpenAI API / LangChain troubleshooting demand.
OpenAI RAG LangChain tool calling is not working/compatible with withStructuredOutput() — tool calls fail silently when structured output format is enabled Developer experiencing repeated API errors where images fail to process, burning through their 5-hour usage window without getting actual image results; wants fix or workaround. Includes evidence for Claude Code troubleshooting demand.
an image in the conversation could not be processed and was removed User wants to use Claude Code WebSearch tool but encounters a 400 API error when deepseek-reasoner model is used; needs fix to restore search functionality for both Chinese and English queries. Includes evidence for Claude Code troubleshooting demand.
deepseek-reasoner does not support this tool_choice Fix Claude Code web client not performing OAuth discovery for MCP servers, causing connection failures when connecting to external authenticated services Includes evidence for Claude Code troubleshooting demand.
claude.ai skips OAuth discovery entirely — POST /oauth/token endpoint missing Fix Claude Code losing GitHub push permissions during extended coding sessions, preventing commit workflow Includes evidence for Claude Code troubleshooting demand.
Claude Code cloud environment cannot push: git push permission denied Fix Claude Code MCP server OAuth flow where PKCE state is lost between authenticate and complete_authentication steps Includes evidence for Claude Code troubleshooting demand.
"No OAuth flow is in progress for {provider}. Call mcp__{provider}__authenticate first" User blocked by undocumented per-minute rate limits in Claude Code despite low overall usage; needs workaround or per-minute limit documentation Includes evidence for Claude Code troubleshooting demand.
API Error: Rate limit reached (session usage 6%, weekly 29%, no per-minute docs) Developer expects SDK to auto-retry on 429 but agent crashes outright; needs robust retry/backoff for production reliability Includes evidence for Claude Code troubleshooting demand.
Agent SDK crashes on 429 rate limit — no exponential backoff or retry implemented