[bug] Agent Preview Share Link does not preserve ?version= parameter, causing start prompt and description to be missing

[Ethan-Tsai]

Technical Feedback

Following up on discussion #386, I found a likely root cause for the Agent Preview shared-link issue.

An Agent configured with a description and start prompt works correctly in my own preview. However, when opened through a shared preview link in another browser/account, the description and start prompt are not preserved, and the page falls back to the default “How can I help you today...” message. I also observed this error in the shared-link flow: invalid_value Invalid 'thread_id': 'conv_...'. Expected an ID that begins with 'thread'.

The likely cause is that the Agent Preview Share / Copy link button does not preserve the current ?version=<version-number> parameter.

Original preview URL:

https://ai.azure.com/nextgen/r/<resource-info>/agents/<agent-name>/preview?version=<version-number>

Copied share link:

https://ai.azure.com/nextgen/r/<resource-info>/agents/<agent-name>/preview

Because the copied link is missing ?version=..., the shared preview does not load the intended agent version. After manually adding the correct version parameter back, the description/start prompt load correctly, and the thread/conversation issue is resolved.

I tested this across two different Foundry projects/resources with different Foundry(new) agents, and the same behavior occurred.

Desired Outcome

The Agent Preview Share / Copy link button should preserve the current ?version= parameter when generating the shared preview URL.

Current Workaround

After adding the version parameter manually, the configured description and start prompt load correctly.