This is a common but serious oversight. You have two distinct compliance boundaries to manage: the data extraction from your Claw agents and the data injection into Mailchimp. Treating them as one process is where failures occur.
First, audit the data at its source. Your Claw agents are likely scraping or aggregating data from various points. You must establish a lawful basis for processing each data point before it even leaves your control. For EU contacts, this typically means explicit, recorded consent for marketing communications. Implied consent or pre-ticked boxes will not suffice. You need to verify the Claw agent's logic captures and stores this consent proof—timestamp, method, and the specific consent language presented.
Second, the transfer itself. You are responsible for the data's integrity and security in transit. Are you using TLS 1.2 or higher for API calls? Is any personal data being logged in plaintext during the transfer process for debugging? Map the exact fields being sent. Mailchimp has specific GDPR features, like tagging consent status, but they only work if you populate them correctly. Do not send any supplemental personal data (like notes or behavioral data) that wasn't covered by the original consent.
Finally, your exit strategy. Can you delete a contact's data from both systems completely and in a verifiable way? Your integration must support individual deletion requests propagating back from Mailchimp to your source systems. If you're using a middleware or custom script, it must handle these reverse workflows. The total cost of ownership for this integration includes building and maintaining these compliance controls.
Trust but verify — especially the fine print.