Python: [AG-UI]: MESSAGES_SNAPSHOT merges toolCalls and content in single assistant message #3619
Description
I'm building a web app using Microsoft Agent Framework AG-UI and CopilotKit.
When using agent-framework-ag-ui and call a tool, the MESSAGES_SNAPSHOT event emitted after tool execution contains a single assistant message with both toolCalls and content fields populated.
This differs from version 1.0.0b260116, where the framework emitted two separate assistant messages: one containing only toolCalls, followed by another containing only content.
Event Log Comparison
Working Version (1.0.0b260116)
{
"id": "agent:1767",
"agentId": "agent",
"type": "MESSAGES_SNAPSHOT",
"timestamp": 1770029417490,
"payload": {
"type": "MESSAGES_SNAPSHOT",
"messages": [
{
"id": "a230ffeb-6e00-4eff-83ff-fbf7af80d978",
"role": "user",
"content": "hi, please can you..."
},
{
"id": "6c310e7e-0cfa-47b3-b028-337d3581172e",
"role": "assistant",
"toolCalls": [
{ "id": "call_NxeUZKVxtof9b1T6tPjulVrT", "function": { "name": "get_alert_by_id", "arguments": "{...}" } },
{ "id": "call_fWQA2lyfVFk9nv26J2XNJrby", "function": { "name": "run_arg_query", "arguments": "{...}" } },
{ "id": "call_Z1BQGGf4qcV0yAwvzMI5MdYi", "function": { "name": "get_dcr_associations", "arguments": "{...}" } }
]
},
{
"id": "2114b057-5ac8-4e2c-9106-ccf7121b116c",
"role": "tool",
"content": "{\"success\": true, \"status\": 200, \"details\": {...}}",
"toolCallId": "call_NxeUZKVxtof9b1T6tPjulVrT"
},
{
"id": "898380bd-b403-43ef-8052-a6aa81408a6b",
"role": "assistant",
"content": "(**alert-investigator-agent**)\n\nHere you found the..."
}
]
}
}Note: Two separate assistant messages - first with toolCalls only, second with content only.
Not working Version (1.0.0b260130)
{
"id": "agent:1722",
"agentId": "agent",
"type": "MESSAGES_SNAPSHOT",
"timestamp": 1770027381461,
"payload": {
"type": "MESSAGES_SNAPSHOT",
"messages": [
{
"id": "e850de5a-384e-4ac4-b983-93dcaa38eb0d",
"role": "user",
"content": "hi, please can you..."
},
{
"id": "5d8a71bb-ccec-493f-afba-a588d3d2e517",
"role": "assistant",
"content": "(**alert-investigator-agent**)\n\nHere you found the...",
"toolCalls": [
{ "id": "call_EaYXZJKsZbQ8uWk6pFuQbPN4", "function": { "name": "get_alert_by_id", "arguments": "{...}" } },
{ "id": "call_n6uPGmtMeRy1RSurnzPfbE9o", "function": { "name": "run_arg_query", "arguments": "{...}" } },
{ "id": "call_90ZLhseHNdWQoFtvrnmZ6jPW", "function": { "name": "get_dcr_associations", "arguments": "{...}" } }
]
},
{
"id": "333d9b38-9cd3-4bc2-b8f9-a0fb40520fcb",
"role": "tool",
"content": "{\"success\": true, \"status\": 200, \"details\": {...}}",
"toolCallId": "call_EaYXZJKsZbQ8uWk6pFuQbPN4"
}
]
}
}Note: Single assistant message containing both toolCalls and content fields simultaneously.
Related Issues
Possibly related to #3568, which reports missing TEXT_MESSAGE_END events. Both issues involve event stream protocol changes in version 1.0.0b260130.
Version information
Python 3.13.3
agent-framework-ag-ui==1.0.0b260130
agent-framework-core==1.0.0b260130
Thank you in advance.
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