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fix(mcp): preserve empty structured content in tool output #3575

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fix(mcp): preserve empty structured content in tool output #3575

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2 changes: 1 addition & 1 deletion src/agents/mcp/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -665,7 +665,7 @@ async def invoke_mcp_tool(

# If structured content is requested and available, use it exclusively
tool_output: ToolOutput
if server.use_structured_content and result.structuredContent:
if server.use_structured_content and result.structuredContent is not None:
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@chatgpt-codex-connector chatgpt-codex-connector Bot Jun 4, 2026

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P1 Badge Update tests for empty structured content

When this branch now serializes empty structured content such as {} instead of falling back to result.content, the committed tests still assert the old fallback behavior (for example tests/mcp/test_mcp_util.py::test_structured_content_handling scenario 4 and test_empty_structured_content_fallback). That leaves the MCP test suite failing for the exact case this change intends to fix, so the expected outputs/regression tests need to be updated in the same change.

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tool_output = json.dumps(result.structuredContent)
else:
tool_output_list: list[ToolOutputItem] = []
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