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Developer has configured .mcp.json for Claude Code but MCP server loads with zero capabilities and no tools appear in the editor Includes evidence for Claude Code troubleshooting demand.
MCP server sees no capabilities / external MCP servers not loading in Claude Code 修复 MCP SDK 在 initialize 阶段同时接收 HTTP header 和 body 中的 protocolVersion 时，未能校验两者一致性的问题，避免 Claude Code/Cursor 等工具因版本协商失败导致的连接异常 Includes evidence for Claude Code troubleshooting demand.
initialize request accepted despite MISMATCHED MCP-Protocol-Version header vs body protocolVersion — server negotiates from JSON-RPC body, ignoring header Fix Dynamic Client Registration failure when connecting Claude Code to GitHub MCP server Includes evidence for Claude Code troubleshooting demand.
Error: Incompatible auth server: does not support dynamic client registration Fix Claude Code MCP server authentication/connection failures Includes evidence for Claude Code troubleshooting demand.
Error: MCP connection failed; could not connect to MCP server Fix Claude Code desktop integration failure on Windows with MSIX/Store installation Includes evidence for Claude Code troubleshooting demand.
/desktop fails on Windows when Claude Desktop is installed as MSIX/Store package (refile of #36079) Fix Claude Code hitting usage limits instantly on simple tasks, partial code generation, forced 4-hour waits Includes evidence for Claude Code troubleshooting demand.
Claude keeps hitting limit on every simple tasks and asks to wait 4 hours — code generation stops midway after 3 lines Fix Claude Code session rate limit hitting 80%/99% and stopping all sessions while API quota usage is low Includes evidence for Claude Code troubleshooting demand.
You've used 80% of your session rate limit — sessions stop working despite being under 30% of overall quota Fix LangChain MCP adapter validation error where model outputs numeric values as strings causing JSON Schema validation failure Includes evidence for LangChain troubleshooting demand.
Input validation error: '1.57' is not of type 'number' — langchain_mcp_adapter validates tool call arguments and model emits string instead of number Fix Claude Code refusing to respond, likely session or quota limit Includes evidence for Claude Code troubleshooting demand.
Claude Code is unable to respond to this request Recover or fix Claude Code sessions stuck with thinking blocks error Includes evidence for Claude Code troubleshooting demand.
thinking blocks error bricking Claude Code sessions Resolve Claude Code SSL certificate expired error on Windows 11 Enterprise that blocks all API calls during Cowork mode Includes evidence for Claude Code troubleshooting demand.
API Error: Unable to connect to API: SSL certificate has expired Fix Claude Code 429 rate limit / quota exhaustion — understand when limit resets and how to avoid hitting it Includes evidence for Claude Code troubleshooting demand.
Error: 429 {"type":"error","error":{"message":"You've hit your limit"}} Fix Claude Code background agent crash after upgrading to version 2.1.143 on macOS arm64 Includes evidence for Claude Code troubleshooting demand.
exit 1 before init — background-spawned agents crash within 60-200ms Fix Claude Code plugin duplicate hook load error — resolve /doctor hook warning for plugins Includes evidence for Claude Code troubleshooting demand.
Plugin hook loaded twice — .claude-plugin/plugin.json declares "hooks": "./hooks/hooks.json" causing duplicate-load error in /doctor Fix Claude Code /clear command that corrupts session history and triggers API 400 errors Includes evidence for Claude Code troubleshooting demand.
/clear corrupts message history — orphaned tool_result causes 400 API error Fix Claude Code that hangs indefinitely when using Sonnet 4-6 with large prompts at default or high effort Includes evidence for Claude Code troubleshooting demand.
claude --print hangs on Sonnet 4-6 at default/high effort with large prompts Fix Claude Code request that fails after significant token consumption, wasting money Includes evidence for Claude Code troubleshooting demand.
Anthropic API Error: Request failed after $25 token consumption in /ultrawork Fix Claude Code session that becomes unrecoverable after a rate limit (429) error Includes evidence for Claude Code troubleshooting demand.
Session unrecoverable after upstream 429: every retry returns 400 previous Fix Claude Code false positive usage policy violation that blocks all queries on Opus 4.7 Includes evidence for Claude Code troubleshooting demand.
API Error: Claude Code is unable to respond to this request, which appears to violate our Usage Policy Fix Anthropic Opus 4.6/4.7 policy changes that block legitimate security research and bug bounty workflows Includes evidence for Claude Code troubleshooting demand.
Anthropic tightened cyber usage filters block authorized bug bounty work retroactively on Opus 4.6/4.7