fix: accept Anthropic tool_reference blocks as text

CHANGELOG.md

@@ -7,8 +7,12 @@ Write each change in both `### English` and `### 中文` under `## Unreleased`.
 
 ### English
 
+- Accept `tool_reference` blocks inside Anthropic tool results and keep them as text instead of rejecting the whole request
+
 ### 中文
 
+- 接受 Anthropic 工具结果中的 `tool_reference` 块并保留为文本，不再整条请求报错
+
 ## 0.4.10 - 2026-09-12
 
 ### English

internal/translate/compat.go

@@ -271,6 +271,16 @@ func anthropicToolResultContent(raw json.RawMessage) (string, []any, error) {
 		switch rawMapString(source, "type") {
 		case "text":
 			texts = append(texts, rawMapContentString(source, "text"))
+		case "tool_reference":
+			// Claude Code's tool search returns references to tools it has
+			// just made available. The Qoder upstream has no equivalent
+			// block, so keep the information as text instead of rejecting
+			// the whole request.
+			name := rawMapString(source, "tool_name")
+			if name == "" {
+				name = "unknown"
+			}
+			texts = append(texts, "Tool available: "+name)
 		case "image":
 			image, err := anthropicImagePart(source)
 			if err != nil {

internal/translate/compat_test.go

@@ -2,6 +2,7 @@ package translate
 
 import (
 	"encoding/json"
+	"strings"
 	"testing"
 )
 
@@ -125,3 +126,42 @@ func TestTranslatedImageOnlyRequestsProduceContentSessionSeed(t *testing.T) {
 		t.Fatal("different anthropic images must not share a seed")
 	}
 }
+
+func TestTranslateAnthropicToolReferenceDegradesToText(t *testing.T) {
+	request := AnthropicMessagesRequest{
+		Model: "deepseek-flash",
+		Messages: []AnthropicMessage{
+			{Role: "assistant", Content: json.RawMessage(`[{"type":"tool_use","id":"toolu_1","name":"ToolSearch","input":{"query":"stop task"}}]`)},
+			{Role: "user", Content: json.RawMessage(`[{"type":"tool_result","tool_use_id":"toolu_1","content":[{"type":"tool_reference","tool_name":"TaskStop"}]}]`)},
+			{Role: "user", Content: json.RawMessage(`[{"type":"text","text":"continue"}]`)},
+		},
+	}
+	chat, err := TranslateAnthropicMessages(request)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(chat.Messages) != 3 || chat.Messages[1].Role != "tool" {
+		t.Fatalf("messages=%#v", chat.Messages)
+	}
+	got := ContentToString(chat.Messages[1].Content)
+	if !strings.Contains(got, "TaskStop") {
+		t.Fatalf("tool reference lost: %#v", chat.Messages[1].Content)
+	}
+	if chat.Messages[2].Role != "user" || ContentToString(chat.Messages[2].Content) != "continue" {
+		t.Fatalf("trailing user message=%#v", chat.Messages[2])
+	}
+
+	unnamed := AnthropicMessagesRequest{
+		Model: "deepseek-flash",
+		Messages: []AnthropicMessage{
+			{Role: "user", Content: json.RawMessage(`[{"type":"tool_result","tool_use_id":"toolu_2","content":[{"type":"tool_reference"}]}]`)},
+		},
+	}
+	chat, err = TranslateAnthropicMessages(unnamed)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if ContentToString(chat.Messages[0].Content) == "" {
+		t.Fatalf("unnamed tool reference must still render text: %#v", chat.Messages[0].Content)
+	}
+}