Designing for Portability: Keeping the Pattern Independent of the Vendor

The center of a Desk loop appears below, with four comments marking the places where the agent's code depends on one vendor's API:

const reply = vendorA.createMessage({
  model: "vendor-a-large",            // 1. A model name inside the loop
  tools: deskToolsInVendorAFormat,    // 2. Tool definitions in this vendor's format
  messages: historyInVendorAFormat    // 3. A history in this vendor's format
})

if (reply.stop_reason === "tool_use") {  // 4. This vendor's stop value
  for (const block of reply.content) {
    if (block.type === "tool_use") runTool(block)
  }
}