Compatibility intelligence
MCP Failure Observatory
Explore how MCP implementations handle real failure scenarios across transports.
Data synced Nov 15, 2026, 11:08 AM
2995943Compatibility Matrix
Latest recorded outcome for each implementation and scenario
| Implementation | Late Response After Cancellation | Baseline | Delay | Delay Timeout | Duplicate | Liveness Legacy | Malformed Missing | Malformed Version | Malformed Both | Late Cancellation | Disconnect | Session Loss | Hang Timeout | Liveness Modern | Duplicate Response | Bounded Delay | Delay Timeout and Recovery | Hang Timeout/Cancellation and Recovery | Initialize | Injected Disconnect Observed | List All Five Tools | Missing/Invalid JSON-RPC Detection and Recovery | Ping Tool | Protocol Ping | Reject Result-With-Error and Recover | Same-Client Recovery After Disconnect | Authenticated get_me | Tool Filter Exclusion | Invalid Authorization | Missing Authorization | Regressing progress | Baseline Ping | 64 KiB response recovery | Result With Error Recovery | Bounded delay | Duplicate Response Recovery | Unknown progress token | Missing Jsonrpc Recovery | Invalid Jsonrpc Version Recovery | Progress after completion | Liveness | Session Loss Availability | Two-second Delay Timeout and Recovery | Missing JSON-RPC Version | Invalid JSON-RPC Version | Late Response After Cancellation | Disconnect Recovery | Protocol Liveness | Timeout Recovery | Disconnect Reconnect | Response After Cancellation Recovery | Hang Timeout Recovery | Session Loss After Response | 250 ms Bounded Delay | Result and Error Response | Baseline Echo | 400 ms Timeout | Recovery After Timeout | Invalid Tool Input | Recovery After Input Error | Cleanup After Timeout | 500 ms Bounded Delay | Normal Cleanup | Liveness Success | Liveness Rejected | Liveness Timeout | Session Loss During Active Request | Protocol Ping Liveness | Hang Cancellation Recovery | Requested Modern Liveness Fallback | Clean Install Startup | New Session After Reconnect | Graceful Proxy Shutdown | Control Route Isolation | Primary Auto-Reconnect | Primary Child Disconnect |
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| C# MCP SDKv2.2.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||||||||||||||||||||||||
| GitHub MCP Serverv1.12.2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||
| Go MCP SDKv1.8.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||||||||||||||||||||
| Java MCP SDKv2.0.1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||||||
| MCP Inspector CLIv2.7.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||
| Official Everything Serverv2026.8.31 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||||||
| Python MCP SDKv2.3.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||||||||||||||||||||||||
| Ruby MCP SDKv1.6.1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||
| Rust MCP SDKv3.4.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||||||||||||||||||||||||
| Supergatewayv4.0.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||||||||
| TypeScript MCP SDKv2.4.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||||||||||||||||||||||||||||||||
| punkpeye/mcp-proxyv6.7.19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | ||||||||||
| sparfenyuk/mcp-proxyv0.12.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |||||||||
| tbxark/mcp-proxyv1.1.0 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Recent Test Runs
Latest records added to the observatory
Go MCP SDKRegressing progress
Go MCP SDKRegressing progress
Go MCP SDKRegressing progress
Go MCP SDK64 KiB response recovery
Go MCP SDKDuplicate Response Recovery
Go MCP SDKRegressing progress
Go MCP SDKRegressing progress
Go MCP SDKUnknown progress token