Error category
Fix Claude Code, OpenCode, OpenClaw, and AI coding assistant failures around login, model routing, tool calls, file edits, permissions, quotas, and stalled agent sessions.
This AI Coding Tools troubleshooting hub collects real error signatures, quick fixes, common causes, and step-by-step debugging paths for developers who need a practical answer instead of a broad overview.
291 articles in this category.
Start by matching the exact error message, then check the technology, environment, credentials, network path, and deployment context. The pages below are grouped so you can move from broad AI Coding Tools symptoms to specific root-cause families without relying on client-side search.
Fix MCP tools in Claude Code returning user denied error even when permissions.allow contains correct server entry, no permission prompt appears Includes evidence for Claude Code troubleshooting demand.
tools spuriously rejected as 'user denied' without permission prompt Fix Claude Code Chrome MCP tools failing on all domains when navigating or reading pages Includes evidence for Claude Code troubleshooting demand.
"Navigation to this domain is not allowed" / "Permission denied for reading pages on this domain" Fix Claude Code on Windows where git worktree remove fails with Permission denied because MCP servers aren't shut down before worktree operations Includes evidence for Claude Code troubleshooting demand.
worktree removal fails with Permission denied due to MCP shutdown ordering User ran /login in Claude Code on Windows, sees success message but tool remains unauthenticated and rejects all commands afterward Includes evidence for Claude Code troubleshooting demand.
/login shows "Login successful" but immediately reverts to "Not logged in". Any subsequent command fails with "Not logged in". Developer calls langgraph.with_structured_output() expecting it to preserve pre-bound tools, but they are silently dropped — functional regression breaking LLM function calling workflows Includes evidence for LangChain troubleshooting demand.
[langchain-openai] with_structured_output() silently drops previously bound tools and lacks support for OpenAI native tool bindings Fix Claude Code MCP server authentication returning HTTP 431 error on Linux platform Includes evidence for Claude Code troubleshooting demand.
HTTP ERROR 431 — MCP server authentication failure (browser restart!) Fix Claude Code OAuth authentication failure after auto-update preventing login to AI coding assistant Includes evidence for Claude Code troubleshooting demand.
OAuth Request Failed — This isn't working right now. You can try again later Fix Claude Code SDK crashing immediately on startup during GitHub Actions CI, no API calls made Includes evidence for Claude Code troubleshooting demand.
error: Claude Code process exited with code 1; SDK execution error: 14 | depsCount Claude Code user wrapping claude in shell function with --dangerously-skip-permissions accidentally triggers recursive process spawning (~197 instances), consuming entire monthly usage quota instantly Includes evidence for Claude Code troubleshooting demand.
[BUG] Running claude sessions list via Bash tool triggers recursive process fork bomb — spawns ~197 concurrent claude --dangerously-skip-permissions instances Claude Code user experiencing sudden quota exhaustion (30%+ per message) despite unchanged usage — wants to understand why quota is consumed faster and how to fix Includes evidence for Claude Code troubleshooting demand.
[Bug] Unexpected quota consumption spike without usage pattern changes — RangeError [ERR_CHILD_PROCESS_STDIO_MAXBUFFER]: stdout maxBuffer length exceeded Claude Code session fails due to Anthropic backend 500 errors; user needs workaround or fix to continue coding session Includes evidence for Claude Code troubleshooting demand.
Anthropic API Error: 500 Internal Server Error LangChain application hitting LLM provider rate limits; developer needs to implement proper retry logic, exponential backoff, or request batching to prevent application crashes Includes evidence for LangChain troubleshooting demand.
Rate limit exceeded – please retry after X seconds (langchain) Fix OAuth Dynamic Client Registration failure when connecting Claude Code MCP servers to external services like Calendly Includes evidence for Claude Code troubleshooting demand.
MCP OAuth DCR fails for third-party service: client_name rejected as invalid_client_metadata Fix Claude Code failing to execute because an MCP server tool is not recognized or registered by the CLI Includes evidence for Claude Code troubleshooting demand.
No handler registered for 'mcp__tools' / MCP tool not registered Fix Claude Code OAuth login failure caused by DNS resolution failure for auth.anthropic.com, especially Windows users on home networks Includes evidence for Claude Code troubleshooting demand.
OAuth login fails: auth.anthropic.com does not resolve via DNS — timeout error prevents authentication Developer discovers unexpectedly high token usage in Claude Code, searching for causes beyond normal rate limits — specifically cache-related cost inflation Includes evidence for Claude Code troubleshooting demand.
Prompt cache broken — silently inflates costs 10-20x in Claude Code; downgrading helps Developer automating Claude Code encounters unexplained daily quota exhaustion, seeking explanation for silent retry behavior Includes evidence for Claude Code troubleshooting demand.
Rate-limit errors appear as generic failures triggering silent retry loops, draining daily budget in minutes Developer on paid Claude Code plan experiencing rapid quota drain, wants to understand why usage limits deplete so quickly and how to extend usage time Includes evidence for Claude Code troubleshooting demand.
Usage limits exhausted in Claude Code — 'Maxed out every Monday, resets Saturday' on $100/mo Max plan 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 Continue through the full static archive for this hub. Every listed page is crawlable and keeps its existing canonical URL.