OpenAPI

Tool discovery fails when OpenAPI schemas contain circular references, blocking the ability to properly register and expose tools.

Authentication headers from the MCP transport layer were being improperly forwarded to downstream OpenAPI APIs, creating security and information disclosure risks.

API providers must maintain SDKs for 8+ languages (JavaScript, Python, Ruby, PHP, Go, Java, C#, etc.), each with different conventions and release cycles. When APIs change, coordinating updates, testing, and releases across all SDKs becomes unsustainable, forcing providers to move slowly or maintain legacy versions for years.