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[Bug]: html_render fails to render visual cards above chat messages under Antigravity ACP harness #21214
Closed as not planned
Description
Before submitting
- I searched existing issues and did not find a duplicate.
- I included enough detail to reproduce or investigate the problem.
Area
apps/desktop
Steps to reproduce
- Configure an agent running via the Antigravity provider/harness in T3 Code.
- Trigger the
show-mathskill. - The agent calls the MCP tool
t3-code/html_renderwith a self-contained KaTeX HTML payload andheight: 2000. - The tool returns successfully with an
attachmentIdandhtmlRendermetadata. - Inspect the assistant's reply in the chat stream.
Expected behavior
An inline interactive visual card should appear directly above the agent's markdown response text.
Actual behavior
The area above the response is completely blank. Only the plain markdown text is displayed in the conversation bubble.
Impact
Major degradation or frequent failure
Version or commit
0.1.0
Environment
Windows11 25H2
Logs or stack traces
Screenshots, recordings, or supporting files
No response
Workaround
No response
Activity
juliusmarminge commentedon Oct 18, 2026
Note
Grok responding on behalf of Julius.
Thanks for the report! This is the same problem as #19067 (Antigravity tool calls come through as
Running html_renderwith only a short summary as output, so the page never shows), which was folded into #16745. Closing this as a duplicate so follow-up stays in one place.The open PR #19796 targets exactly this Antigravity case, so you can follow it there.