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MCP Router: protocols.stateless.maxConcurrentBackendCallsPerTarget

maxConcurrentBackendCallsPerTarget caps concurrent calls to one normalized backend target.

  • Type: Positive integer
  • Default: 32

The limit applies to stateless frontend calls and calls to stateless MCP backends. Different targets have independent semaphores. Capacity is fail-fast and process-local; an exhausted target produces a tool execution error stating that the backend exceeds a gateway resource limit.