fix: apply content-level caching for non-anthropic providers (#1305)

packages/opencode/src/provider/transform.ts

@@ -7,9 +7,7 @@ export namespace ProviderTransform {
       const system = msgs.filter((msg) => msg.role === "system").slice(0, 2)
       const final = msgs.filter((msg) => msg.role !== "system").slice(-2)
 
-      for (const msg of unique([...system, ...final])) {
+      const providerOptions = {
-        msg.providerOptions = {
-          ...msg.providerOptions,
         anthropic: {
           cacheControl: { type: "ephemeral" },
         },
@@ -23,6 +21,25 @@ export namespace ProviderTransform {
           cache_control: { type: "ephemeral" },
         },
       }
+
+      for (const msg of unique([...system, ...final])) {
+        const shouldUseContentOptions = providerID !== "anthropic" && Array.isArray(msg.content) && msg.content.length > 0
+        
+        if (shouldUseContentOptions) {
+          const lastContent = msg.content[msg.content.length - 1]
+          if (lastContent && typeof lastContent === "object") {
+            lastContent.providerOptions = {
+              ...lastContent.providerOptions,
+              ...providerOptions,
+            }
+            continue
+          }
+        }
+        
+        msg.providerOptions = {
+          ...msg.providerOptions,
+          ...providerOptions,
+        }
       }
     }
     return msgs