Independent AI engineering lab for reproducible Agent, LangGraph, n8n, MCP, OpenAI and AI SDK problems.
在高处看世界,在底层堆资产。
aupdate_state→InvalidUpdateError: Ambiguous update· full analysis- ToolNode async
max_concurrencyignored · full analysis - SQLite failed batch partially commits state · full analysis
- 2.35.3
$jsonmutating Array methods returnnull· full analysis - HTTP Request Raw body returns stream internals · full analysis
- ARM64 distroless
GLIBC_PRIVATEfailure · full analysis
- Responses API stream abort /
No tool call found· full analysis - Agents SDK RunState approval/resume lab · full analysis
StreamableHTTPClientTransportSSE disconnect leaves POST pending until timeout · upstream #2739 · full analysis- MCP stdio /
-32700 Parse Errordiagnostics · full analysis - AI SDK 7 migration demo · full analysis
Browse the XBSTACK Problem Labs index →
Every lab aims to preserve this chain:
real problem → minimal reproduction → version matrix → tested workaround → upstream thread → XBSTACK deep dive
- MCP StreamableHTTPClientTransport POST Stays Pending After SSE Disconnect: Issue #2739 Reproduced (2026-09-01)
- How to Configure llms.txt v2: alternate, describedby, and Markdown Discovery (2026-08-31)
- How to Add WebMCP to a Website: Chrome 149, Tool Schemas, and registerTool (2026-08-31)
- How to Test an MCP Server Before Production: Read-Only Inspector Preflight (2026-08-31)
- How to Security Check an MCP Configuration: Secrets, Shell, Remote MCP, and Permissions (2026-08-31)
- Agent Readiness Auditor — public website discovery/readiness checks.
- MCP Inspector — read-only MCP endpoint preflight and compatibility inspection.
- MCP / Agent Compatibility Tracker — live MCP server observations plus MCP, AI SDK, LangGraph and OpenAI Agents issue/version tracking.
- Agent Security Auditor — configuration-level security review with secret redaction and least-privilege checks.
AI Agent engineering · MCP protocol · LangGraph production state · n8n workflows · OpenAI APIs/Agents SDK · AI SDK · reproducible debugging · evaluation · security · deployment