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fix: validate participants early in BaseGroupChat - #8261

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MOHAMMED WASIM KHAN (wasim-builds) wants to merge 3 commits into
microsoft:mainfrom
wasim-builds:fix/7580-roundrobin-participants-validation
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MOHAMMED WASIM KHAN (wasim-builds) wants to merge 3 commits into
microsoft:mainfrom
wasim-builds:fix/7580-roundrobin-participants-validation

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Fixes #7580

Previously, passing None, a non-sequence, or non-agent objects as
participants would raise internal AttributeError/TypeError. Now raises
clear TypeError with descriptive message.

Fixes microsoft#7580
Copilot AI lite review requested due to automatic review settings September 19, 2026 19:07

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@wasim-builds

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Hello everyone,

Checking in regarding this contribution for microsoft/autogen (fix: validate participants early in BaseGroupChat). Contributing around multi-agent orchestration, agent communication, and tool execution in AutoGen has been exciting, and I'd love to help out with additional improvements and features across microsoft/autogen.

I am actively exploring freelance/contract engagements as well as full-time engineering positions and contributor roles.

More details about my background and projects can be found on my profile: https://github.com/wasim-builds.

@wasim-builds
MOHAMMED WASIM KHAN (wasim-builds) force-pushed the fix/7580-roundrobin-participants-validation branch from 6b37d83 to 01543e6 Compare October 6, 2026 19:38

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RoundRobinGroupChat raises raw AttributeError/TypeError for invalid participants instead of a clear validation error

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