Screenshot attached. In agent builder when trying to add a MCP Server the UI just spins [image]

Hi everyone! We deployed a fix for the issue where adding an MCP task and selecting “Add Server” or “Add Connection” caused the “Add connector” modal to freeze with an indefinite loading spinner. Thanks for the reports + please let us know if you run into any further issues.

I’m getting the same issue in other places where the MCP server tools dialog is used. In the DevTools console I see this error: index-BvhmMsip.js:66 Warning: Missing `Description` or `aria-describedby={undefined}` for {DialogContent}. Looks like some of the built-in MCP tools (Google Docs, Googl…

Same issue. When creating a new workflow in Agent Builder → Workflows, adding an MCP task and selecting “Add Server” or “Add Connection” causes the “Add connector” modal to freeze with an indefinite loading spinner. This occurs with a fresh workflow and default MCP task (no custom configuration).

Same issue here. I first observed the issue yesterday afternoon and have been battling through various different pathways assuming it was a problem on my end. Happy to see i’m not the only person facing this issue. It hangs at the spinner when trying to add an MCP server as an agent tool and also w…

Ditto! I really, really want to use Agent Builder, but everytime I try something it breaks. It doesn’t feel stable enough to be called Beta! I wonder has anyone on the thread contacted Support on this?

Same issue, appears limited in scope to MCP (from what I’ve seen)

It is fixed now, at least for me.

Agent Builder- When adding a MCP Server tool, UI just spins

API

Topic		Replies	Views
Agent Builder: MCP “Add Connector” spinner and config.allowed_tools error Bugs bug , mcp , agent-builder	9	337	November 17, 2025
MCP Task in a workflow Add Connection is not working Bugs api , mcp , agent-builder	5	252	November 17, 2025
Agent Builder and MCP: 424 errors and server timeouts Bugs mcp , agent-builder	5	504	February 18, 2026
Issue when try to use any of MCP servers or connectors in Agent Builder Bugs mcp , agent-builder	25	3669	January 4, 2026
Issue with Agent Builder: workflow page stuck after adding MCP API	0	121	October 21, 2025

Agent Builder- When adding a MCP Server tool, UI just spins

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