Reproducible AI engineering labs for real-world Agent, MCP, LangGraph, n8n, OpenAI and AI SDK problems.
在高处看世界，在底层堆资产。
XBSTACK turns real engineering failures into public, verifiable assets:
real problem → minimal reproduction → version matrix → tested workaround → upstream issue → deep dive
Problem Labs · MCP & Agent Tools · XBSTACK.com
| Problem | Repro / Lab | Upstream / Analysis |
|---|---|---|
MCP StreamableHTTPClientTransport stays pending after request-scoped SSE EOF/error |
mcp-streamable-http-sse-pending-repro | typescript-sdk#2739 · analysis |
LangGraph Command(resume=dict) can misclassify ordinary dictionaries as interrupt maps |
langgraph-command-resume-dict-misclassification-repro | langgraph#8693 · tracker |
AI SDK WorkflowAgent signed approval: unsupported baseline → opt-in signed replay enforcement |
ai-sdk-workflowagent-signed-approval-repro | vercel/ai#19964 · analysis |
LangGraph async aupdate_state raises Ambiguous update where sync succeeds |
langgraph-aupdate-state-ambiguous-update-repro | langgraph#8714 · analysis |
| n8n Raw body + explicit JSON response returns stream internals | n8n-http-request-raw-body-stream-repro | n8n#36402 · analysis |
| OpenAI Agents SDK RunState approval/resume across processes and redelivery | openai-agents-runstate-approval-resume-lab | analysis |
- MCP Inspector — read-only MCP endpoint preflight and compatibility inspection.
- Agent Readiness Auditor — website discovery/readiness checks for AI agents.
- MCP / Agent Compatibility Tracker — issue/version observations across MCP, AI SDK, LangGraph and OpenAI Agents.
- Agent Security Auditor — configuration-level review with secret redaction and least-privilege checks.
AI Agent engineering · MCP protocol · LangGraph production state · n8n workflows · OpenAI APIs / Agents SDK · Vercel AI SDK · reproducible debugging · evaluation · security · deployment
- Reproduction evidence is separated from inference and vendor claims.
- Workarounds remain labeled as workarounds until a fixed release is independently verified.
- Version matrices are rerun when candidate releases appear.
- GitHub Issue / Discussion replies include an XBSTACK link only when it directly helps solve the thread's problem.
- No generic promotional replies or unrelated backlinks.
Browse all reproducible engineering assets → XBSTACK Problem Labs