fix: filter empty content blocks for Bedrock provider (#14586)

2 files changed, 33 insertions, 1 deletions

diff --git a/packages/opencode/src/provider/transform.ts b/packages/opencode/src/provider/transform.ts
index 407c26878..05b9f031f 100644
--- a/packages/opencode/src/provider/transform.ts
+++ b/packages/opencode/src/provider/transform.ts
@@ -51,7 +51,7 @@ export namespace ProviderTransform {
   ): ModelMessage[] {
     // Anthropic rejects messages with empty content - filter out empty string messages
     // and remove empty text/reasoning parts from array content
-    if (model.api.npm === "@ai-sdk/anthropic") {
+    if (model.api.npm === "@ai-sdk/anthropic" || model.api.npm === "@ai-sdk/amazon-bedrock") {
       msgs = msgs
         .map((msg) => {
           if (typeof msg.content === "string") {
diff --git a/packages/opencode/test/provider/transform.test.ts b/packages/opencode/test/provider/transform.test.ts
index ecb3a7480..917d357ea 100644
--- a/packages/opencode/test/provider/transform.test.ts
+++ b/packages/opencode/test/provider/transform.test.ts
@@ -1096,6 +1096,38 @@ describe("ProviderTransform.message - anthropic empty content filtering", () =>
     expect(result[0].content[1]).toEqual({ type: "text", text: "Result" })
   })
 
+  test("filters empty content for bedrock provider", () => {
+    const bedrockModel = {
+      ...anthropicModel,
+      id: "amazon-bedrock/anthropic.claude-opus-4-6",
+      providerID: "amazon-bedrock",
+      api: {
+        id: "anthropic.claude-opus-4-6",
+        url: "https://bedrock-runtime.us-east-1.amazonaws.com",
+        npm: "@ai-sdk/amazon-bedrock",
+      },
+    }
+
+    const msgs = [
+      { role: "user", content: "Hello" },
+      { role: "assistant", content: "" },
+      {
+        role: "assistant",
+        content: [
+          { type: "text", text: "" },
+          { type: "text", text: "Answer" },
+        ],
+      },
+    ] as any[]
+
+    const result = ProviderTransform.message(msgs, bedrockModel, {})
+
+    expect(result).toHaveLength(2)
+    expect(result[0].content).toBe("Hello")
+    expect(result[1].content).toHaveLength(1)
+    expect(result[1].content[0]).toEqual({ type: "text", text: "Answer" })
+  })
+
   test("does not filter for non-anthropic providers", () => {
     const openaiModel = {
       ...anthropicModel,