fix: convert anthropic image content blocks

tests/test_run_agent.py

@@ -12,7 +12,7 @@ import uuid
 from logging.handlers import RotatingFileHandler
 from pathlib import Path
 from types import SimpleNamespace
-from unittest.mock import MagicMock, patch
+from unittest.mock import AsyncMock, MagicMock, patch
 
 import pytest
 
@@ -1986,6 +1986,69 @@ class TestBuildApiKwargsAnthropicMaxTokens:
                 assert call_args[0][3] is None
 
 
+class TestAnthropicImageFallback:
+    def test_build_api_kwargs_converts_multimodal_user_image_to_text(self, agent):
+        agent.api_mode = "anthropic_messages"
+        agent.reasoning_config = None
+
+        api_messages = [{
+            "role": "user",
+            "content": [
+                {"type": "text", "text": "Can you see this now?"},
+                {"type": "image_url", "image_url": {"url": "https://example.com/cat.png"}},
+            ],
+        }]
+
+        with (
+            patch("tools.vision_tools.vision_analyze_tool", new=AsyncMock(return_value=json.dumps({"success": True, "analysis": "A cat sitting on a chair."}))),
+            patch("agent.anthropic_adapter.build_anthropic_kwargs") as mock_build,
+        ):
+            mock_build.return_value = {"model": "claude-sonnet-4-20250514", "messages": [], "max_tokens": 4096}
+            agent._build_api_kwargs(api_messages)
+
+        kwargs = mock_build.call_args.kwargs or dict(zip(
+            ["model", "messages", "tools", "max_tokens", "reasoning_config"],
+            mock_build.call_args.args,
+        ))
+        transformed = kwargs["messages"]
+        assert isinstance(transformed[0]["content"], str)
+        assert "A cat sitting on a chair." in transformed[0]["content"]
+        assert "Can you see this now?" in transformed[0]["content"]
+        assert "vision_analyze with image_url: https://example.com/cat.png" in transformed[0]["content"]
+
+    def test_build_api_kwargs_reuses_cached_image_analysis_for_duplicate_images(self, agent):
+        agent.api_mode = "anthropic_messages"
+        agent.reasoning_config = None
+        data_url = "data:image/png;base64,QUFBQQ=="
+
+        api_messages = [
+            {
+                "role": "user",
+                "content": [
+                    {"type": "text", "text": "first"},
+                    {"type": "input_image", "image_url": data_url},
+                ],
+            },
+            {
+                "role": "user",
+                "content": [
+                    {"type": "text", "text": "second"},
+                    {"type": "input_image", "image_url": data_url},
+                ],
+            },
+        ]
+
+        mock_vision = AsyncMock(return_value=json.dumps({"success": True, "analysis": "A small test image."}))
+        with (
+            patch("tools.vision_tools.vision_analyze_tool", new=mock_vision),
+            patch("agent.anthropic_adapter.build_anthropic_kwargs") as mock_build,
+        ):
+            mock_build.return_value = {"model": "claude-sonnet-4-20250514", "messages": [], "max_tokens": 4096}
+            agent._build_api_kwargs(api_messages)
+
+        assert mock_vision.await_count == 1
+
+
 class TestFallbackAnthropicProvider:
     """Bug fix: _try_activate_fallback had no case for anthropic provider."""