Hello,
A Copilot Studio custom agent can be published to and invoked from Microsoft 365 Copilot Chat. However, current documentation does not indicate that the Edge sidebar’s browsing or page context is automatically passed to the selected custom agent.
This is a current product limitation/by-design behavior, rather than a bug.
For this scenario, consider explicitly passing the required form data to the agent through webpage context variables, a secured connector/API, or a user-provided screenshot. The agent can then use SharePoint as its grounded knowledge source. Review DLP and sensitive-data requirements before transferring form content.
A feature request can also be submitted for automatic forwarding of consented Edge page context to Copilot Studio agents.
References: