Fix: add codeexec attachments output (#14787)

### What problem does this PR solve?

add codeexec attachments output

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/tools/code_exec.py

@@ -37,6 +37,7 @@ SYSTEM_OUTPUT_KEYS = frozenset(
     {
         "content",
         "actual_type",
+        "attachments",
         "_ERROR",
         "_ARTIFACTS",
         "_ATTACHMENT_CONTENT",
@@ -312,7 +313,10 @@ module.exports = { main };
         self.lang = Language.PYTHON.value
         self.script = 'def main(arg1: str, arg2: str) -> dict: return {"result": arg1 + arg2}'
         self.arguments = {}
-        self.outputs = {"result": {"value": "", "type": "object"}}
+        self.outputs = {
+            "result": {"value": "", "type": "object"},
+            "attachments": {"value": [], "type": "Array<String>"},
+        }
 
     def check(self):
         self.check_valid_value(self.lang, "Support languages", ["python", "python3", "nodejs", "javascript"])
@@ -468,11 +472,13 @@ class CodeExec(ToolBase, ABC):
             self.set_output("_ARTIFACTS", artifact_urls or None)
             attachment_text = self._build_attachment_content(artifacts, artifact_urls)
             self.set_output("_ATTACHMENT_CONTENT", attachment_text)
+            self.set_output("attachments", self._build_attachment_markdown_list(artifact_urls))
             if attachment_text:
                 content_parts.append(attachment_text)
         else:
             self.set_output("_ARTIFACTS", None)
             self.set_output("_ATTACHMENT_CONTENT", "")
+            self.set_output("attachments", [])
 
         self.set_output("content", "\n\n".join([part for part in content_parts if part]).strip())
 
@@ -641,6 +647,23 @@ class CodeExec(ToolBase, ABC):
             return f"attachment_count: {len(sections)}\n\n" + "\n\n".join(sections)
         return "attachment_count: 0"
 
+    def _build_attachment_markdown_list(self, artifact_urls: list[dict]) -> list[str]:
+        markdown_items = []
+        for art in artifact_urls:
+            name = _art_field(art, "name")
+            url = _art_field(art, "url")
+            mime_type = str(_art_field(art, "mime_type") or "").strip().lower()
+            if not name:
+                continue
+
+            if mime_type.startswith("image/") and url:
+                markdown_items.append(f"![{name}]({url})")
+            elif url:
+                markdown_items.append(f"[Download {name}]({url})")
+            else:
+                markdown_items.append(name)
+        return markdown_items
+
     def _normalize_attachment_type(self, name: str, mime_type: str) -> str:
         mime_type = str(mime_type or "").strip().lower()
         if mime_type.startswith("image/"):

test/testcases/test_web_api/test_canvas_app/test_code_exec_contract_unit.py

@@ -140,7 +140,7 @@ def test_select_business_output_ignores_system_outputs():
         "actual_type": {"value": "", "type": "string"},
         "_ERROR": {"value": "", "type": "string"},
         "_ARTIFACTS": {"value": [], "type": "Array<Object>"},
-        "_ATTACHMENT_CONTENT": {"value": "", "type": "string"},
+        "attachments": {"value": [], "type": "Array<String>"},
         "raw_result": {"value": None, "type": "Any"},
         "_created_time": {"value": 1.0, "type": "Number"},
         "_elapsed_time": {"value": 2.0, "type": "Number"},
@@ -297,7 +297,7 @@ def test_legacy_multi_output_schema_is_rejected():
         )
 
 
-@pytest.mark.parametrize("name", ["content", "actual_type", "_ERROR", "_ARTIFACTS", "_ATTACHMENT_CONTENT", "raw_result"])
+@pytest.mark.parametrize("name", ["content", "actual_type", "attachments", "_ERROR", "_ARTIFACTS", "raw_result"])
 def test_reserved_business_output_names_are_rejected(name):
     module = _load_module()
     with pytest.raises(module.ContractError, match="reserved output name"):
@@ -387,7 +387,6 @@ def test_process_execution_result_returns_early_for_stderr_only_without_artifact
 def test_process_execution_result_appends_artifact_content_to_canonical_content():
     tool = _build_code_exec("Object")
     tool._upload_artifacts = lambda _artifacts: [{"name": "chart.png", "url": "/artifact/chart.png", "mime_type": "image/png", "size": 12}]
-    tool._build_attachment_content = lambda _artifacts, _artifact_urls: "attachment_count: 1\n\nattachment1 (image): chart.png\nparsed artifact"
 
     result = tool._process_execution_result(
         '{"foo": "bar"}',
@@ -400,8 +399,7 @@ def test_process_execution_result_appends_artifact_content_to_canonical_content(
     assert result["content"] == '{\n  "foo": "bar"\n}\n\nattachment_count: 1\n\nattachment1 (image): chart.png\nparsed artifact'
     assert result["_ARTIFACTS"] == [{"name": "chart.png", "url": "/artifact/chart.png", "mime_type": "image/png", "size": 12}]
     assert result["_ARTIFACTS"][0]["mime_type"] == "image/png"
-    assert result["_ATTACHMENT_CONTENT"] == "attachment_count: 1\n\nattachment1 (image): chart.png\nparsed artifact"
-    assert "attachment1 (image): chart.png" in result["_ATTACHMENT_CONTENT"]
+    assert result["attachments"] == ["![chart.png](/artifact/chart.png)"]
 
 
 def test_process_execution_result_without_artifacts_clears_stale_artifacts_output():

web/src/pages/agent/form-sheet/single-debug-sheet/utils.ts

@@ -4,6 +4,7 @@ import { CodeOutputContract } from '../../form/code-form/utils';
 const SYSTEM_OUTPUT_NAMES = new Set([
   '_ERROR',
   '_ARTIFACTS',
+  'attachments',
   '_ATTACHMENT_CONTENT',
 ]);
 

web/src/pages/agent/form/code-form/utils.ts

@@ -14,6 +14,7 @@ const CodeExecReservedOutputKeys = [
   'content',
   'actual_type',
   'raw_result',
+  'attachments',
   '_ERROR',
   '_ARTIFACTS',
   '_ATTACHMENT_CONTENT',
@@ -30,6 +31,10 @@ export const CodeExecPanelSystemOutputs: ICodeForm['outputs'] = {
     type: 'String',
     value: '',
   },
+  attachments: {
+    type: 'Array<String>',
+    value: [],
+  },
 };
 
 const CodeExecReservedOutputKeySet = new Set<string>(

web/src/utils/canvas-util.tsx

@@ -73,6 +73,10 @@ function getNodeOutputs(x: BaseNode) {
       type: JsonSchemaDataType.String,
       value: '',
     },
+    attachments: outputs.attachments ?? {
+      type: 'Array<String>',
+      value: [],
+    },
   };
 }