feat: add cloudflare ai gateway provider

src/agents/cloudflare-ai-gateway.ts

@@ -0,0 +1,44 @@
+import type { ModelDefinitionConfig } from "../config/types.js";
+
+export const CLOUDFLARE_AI_GATEWAY_PROVIDER_ID = "cloudflare-ai-gateway";
+export const CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_ID = "claude-sonnet-4-5";
+export const CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_REF = `${CLOUDFLARE_AI_GATEWAY_PROVIDER_ID}/${CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_ID}`;
+
+export const CLOUDFLARE_AI_GATEWAY_DEFAULT_CONTEXT_WINDOW = 200_000;
+export const CLOUDFLARE_AI_GATEWAY_DEFAULT_MAX_TOKENS = 64_000;
+export const CLOUDFLARE_AI_GATEWAY_DEFAULT_COST = {
+  input: 3,
+  output: 15,
+  cacheRead: 0.3,
+  cacheWrite: 3.75,
+};
+
+export function buildCloudflareAiGatewayModelDefinition(params?: {
+  id?: string;
+  name?: string;
+  reasoning?: boolean;
+  input?: Array<"text" | "image">;
+}): ModelDefinitionConfig {
+  const id = params?.id?.trim() || CLOUDFLARE_AI_GATEWAY_DEFAULT_MODEL_ID;
+  return {
+    id,
+    name: params?.name ?? "Claude Sonnet 4.5",
+    reasoning: params?.reasoning ?? true,
+    input: params?.input ?? ["text", "image"],
+    cost: CLOUDFLARE_AI_GATEWAY_DEFAULT_COST,
+    contextWindow: CLOUDFLARE_AI_GATEWAY_DEFAULT_CONTEXT_WINDOW,
+    maxTokens: CLOUDFLARE_AI_GATEWAY_DEFAULT_MAX_TOKENS,
+  };
+}
+
+export function resolveCloudflareAiGatewayBaseUrl(params: {
+  accountId: string;
+  gatewayId: string;
+}): string {
+  const accountId = params.accountId.trim();
+  const gatewayId = params.gatewayId.trim();
+  if (!accountId || !gatewayId) {
+    return "";
+  }
+  return `https://gateway.ai.cloudflare.com/v1/${accountId}/${gatewayId}/anthropic`;
+}