Python: Citation Annotation Support for Responses API and AGUI

I'm not sure if this is a bug or a feature request. When connecting to Foundry agents with SharePoint grounding (via agent-framework-openai / agent-framework-ag-ui) , the OpenAI Responses API emits response.content_part.done events containing AnnotationURLCitation objects. These are currently logged as "Unparsed" by agent_framework.openai and discarded, so citation data never reaches the AG-UI event stream or frontend.

We think this is maybe by design - the framework is transport-agnostic and doesn't parse provider-specific events. However, there's currently no supported way for applications to access this data, which means building citation UI requires fragile workarounds (see below).

Environment

• agent-framework-core: 1.13.0 / agent-framework-foundry: 1.10.4 / agent-framework-ag-ui: 1.0.1 / agent-framework-openai: 1.12.0
• azure-ai-projects: 2.3.0 / openai: 2.51.0 / Python: 3.12

Evidence

The citation data arrives complete and well-formed, but is discarded:

2026-07-31 12:05:54,178 [DEBUG] agent_framework.openai - Unparsed event of type: response.output_text.done: ResponseTextDoneEvent(...)
2026-07-31 12:05:54,179 [DEBUG] agent_framework.openai - Unparsed event of type: response.content_part.done: ResponseContentPartDoneEvent(
  part=ResponseOutputText(
    annotations=[
      AnnotationURLCitation(
        end_index=1154, start_index=1142,
        title='https://sharepoint.example.com/sites/internal-site/Shared Documents/document-one.pdf',
        type='url_citation',
        url='https://sharepoint.example.com/sites/internal-site/Shared Documents/document-one.pdf'
      ),
      # ... more citations
    ],
    text='Full response text...',
    type='output_text'
  ),
  type='response.content_part.done'
)

Current Workaround

We've implemented a logging handler that intercepts agent_framework.openai log records, extracts AnnotationURLCitation objects from response.content_part.done events, and re-emits them as a CustomEvent before RUN_FINISHED. This works but is fragile (depends on log message format) and non-discoverable.

Status: Tested and confirmed working - captures citations per grounded query

Request

Is there a supported or recommended way to access response.content_part.done annotation data from an AG-UI application? If not, could the framework provide one?

Some options we've considered:

• Emit a CustomEvent from the framework when citations are detected (similar to the existing oauth_consent_request pattern)
• A hook or callback mechanism for applications to handle unparsed provider events
• Documentation on the recommended pattern for extracting grounding metadata

Questions

1. Is citation/annotation support on the roadmap for agent-framework?
2. Is the logging-handler workaround ok short-term, or is there a better supported path?
3. Are there other Responses API events (reasoning, moderation, etc.) that other teams have needed to surface similarly?