mcp-server-debug

Debug MCP servers failing to register tools by validating the stdio initialization handshake, checking environment-variable propagation, and inspecting tool-schema wiring to isolate the fault across the server, transport, or host routing.

MCP servers return initialization errors when the stdio handshake fails schema validation or environment variables are not properly injected, requiring step-by-step diagnostic checks of the initialize flow to surface actionable clues.

Validate environment variable injection in an MCP server by running diagnostic checks on env-var propagation to verify whether the host correctly routes required variables to the server process during the stdio initialization.

Inspect tool-schema mismatches in an MCP server by performing tools-list inspection and schema mismatch detection to identify registration issues caused by incorrect tool-schema wiring between the server and host.

Yes, the diagnostic workflow localizes transport bugs in MCP servers by validating the stdio handshake and environment propagation to determine whether the failure originates in the server, the transport, or the host's tool routing.