{"uid":"cap_MFAQS4ccTGEc7OQDmMatN","slug":"saylor-innovations-guide-library-mcp-connection-and-tool-call-failures-dedfb309","name":"Saylor Innovations Guide Library: MCP Connection and Tool-Call Failures","description":"Debug MCP server connection and tool-call failures - stdio transport, initialize handshake, tool schemas, isError results, inspector","url":"https://saylorinnovations.com/api/kb/mcp-connection-and-tool-call-failures?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string","const":"json"},"example":{"type":"object","required":["id","t","c","body"],"properties":{"c":{"type":"string","description":"Category of the guide"},"t":{"type":"string","description":"Title of the guide"},"id":{"type":"string","description":"Identifier of the record"},"body":{"type":"string","description":"Main body text"},"price":{"type":["number","null"],"description":"Price"},"license":{"type":"string","description":"License identifier"}}}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_7pDUkRmkgfVMKsXvm92wJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a structured guide article explaining how to debug MCP server connection failures and tool-call errors, covering stdio transport, initialize handshake, tool schemas, isError results, and the inspector.","exampleAgentPrompt":"I'm getting connection errors with my MCP server using stdio transport and I can't figure out why my tool calls are failing — can you pull up the Saylor Innovations guide on debugging MCP connection and tool-call failures?","exampleUseCases":[{"title":"Fixing MCP stdio transport startup","prompt":"My MCP server using stdio transport won't connect — the initialize handshake seems to be failing. 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