MCP Incident Lab
An inventory agent (Node, @sentry/node) asks an MCP tool (Python, sentry-sdk with MCPIntegration) whether SKU-1001 is in stock. Really: 42 units. Break the tool and compare what the agent said, what really happened, and what Sentry recorded.
What really happened
What Sentry recorded (spans read back from Sentry)
JS agentPY / JS·S MCP server, Python or JSdashed bar: span that never arrived