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How does an MCP server select which tool or API to use?

How does an MCP server select which tool or API to use?

Tool selection is either implicit or explicit.
  • Implicit (default) The agent decides which server to invoke based on:
    • Tool availability
    • Past performance
    • Cost-efficiency
    • Security level
  • Explicit (power users) The user can hard-code tool preference:
{ “task”: “port_scan”, “target”: “socradar.io”, “server_hint”: “nmap-cloud”, “scan_type”: “udp” } Some servers also expose capability metadata, which helps agents auto-select based on task compatibility. Over time, this tool-routing layer will evolve to support scoring, fallback options, and fine-tuned performance heuristics, similar to a load balancer but for agents and tools.
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