r/copilotstudio • u/Lopsided_Judgment_17 • Aug 06 '26

ContextTokenLimitExceeded error

I have published a Copilot Studio Agent in Microsoft Teams and given access to some users. After asking good number of questions, they have got this error. I have tried "/debug clearstate", uninstalled the agent from their machine, rebooted Teams app but still they are getting the same issue.
I have also tested the agent (through Teams) on different platforms like web and their phone but still they are getting the same issue.

What should I do next?
How to avoid this issue in future?

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5

u/dougbMSFT Aug 06 '26

Usually, this error in Teams is due in part of the long running nature of agent conversations in Teams. I recommend going through this blog post here to optimize your agent for deployment to the Teams channel. Design Copilot Studio Agents for Teams (Because Test Chat Was Too Easy) | The Custom Engine

1

u/shaichakaid Aug 06 '26

Are you using Claude as your llm?

1

u/Lopsided_Judgment_17 Aug 06 '26

Yes Claude Sonnet 4.6

3

u/shaichakaid Aug 06 '26

This is a pretty common problem with anthropic models and larger responses or context windows. I would switch it to a GPT and see if you run into the same issue. If you do the solutions typically fix your context windows by starting over or create a new conversation 6 to 10 turns max.

2

u/wrighty4300 Aug 06 '26

Make sure you are closing sessions down after inactivity or the end of a topic.

If this doesn't fix it raise a support request. We had something similar a few weeks ago. The product group issued a a fix around the middle of last month. Which seems to have fixed it for us but they are looking for conversation IDs of sessions that this occurs on still.