feat(bedrock): Add token caching for any amazon-bedrock provider (#18959)

packages/opencode/src/provider/transform.ts

@@ -194,7 +194,10 @@ export namespace ProviderTransform {
     }
 
     for (const msg of unique([...system, ...final])) {
-      const useMessageLevelOptions = model.providerID === "anthropic" || model.providerID.includes("bedrock")
+      const useMessageLevelOptions =
+	      model.providerID === "anthropic" ||
+	      model.providerID.includes("bedrock") ||
+	      model.api.npm === "@ai-sdk/amazon-bedrock"
       const shouldUseContentOptions = !useMessageLevelOptions && Array.isArray(msg.content) && msg.content.length > 0
 
       if (shouldUseContentOptions) {

packages/opencode/test/provider/transform.test.ts

@@ -1629,6 +1629,43 @@ describe("ProviderTransform.message - claude w/bedrock custom inference profile"
   })
 })
 
+describe("ProviderTransform.message - bedrock caching with non-bedrock providerID", () => {
+  test("applies cache options at message level when npm package is amazon-bedrock", () => {
+    const model = {
+      id: "aws/us.anthropic.claude-opus-4-6-v1",
+      providerID: "aws",
+      api: {
+        id: "us.anthropic.claude-opus-4-6-v1",
+        url: "https://bedrock-runtime.us-east-1.amazonaws.com",
+        npm: "@ai-sdk/amazon-bedrock",
+      },
+      name: "Claude Opus 4.6",
+      capabilities: {},
+      options: {},
+      headers: {},
+    } as any
+
+    const msgs = [
+      {
+        role: "system",
+        content: [{ type: "text", text: "You are a helpful assistant" }],
+      },
+      {
+        role: "user",
+        content: [{ type: "text", text: "Hello" }],
+      },
+    ] as any[]
+
+    const result = ProviderTransform.message(msgs, model, {}) as any[]
+    
+    // Cache should be at the message level and not the content-part level
+    expect(result[0].providerOptions?.bedrock).toEqual({
+      cachePoint: { type: "default" },
+    })
+    expect(result[0].content[0].providerOptions?.bedrock).toBeUndefined()
+  })
+})
+
 describe("ProviderTransform.message - cache control on gateway", () => {
   const createModel = (overrides: Partial<any> = {}) =>
     ({