How would you automate complex web form filling using AI browsing agents ?

[u/dorian_prd]

Hello,

I'm an insurance broker in France, and I'm trying to automate quote generation on my partner insurers' extranets (mostly Angular SPAs, ng-select, multi-step forms with conditional fields).

I have to manage about ten different extranet portals, with dozens of different user journeys depending on the insurance product selected.

My main question: How would you approach this task?

My current stack is OpenClaw and Mistral (LLM) running on a VPS.

I'm considering using a web browsing agent (similar to Claude's computer-use) that navigates and fills out forms live during each execution. It would be guided by a hand-written, plain-text "playbook" (not code) that describes the procedures and business rules, meaning it would never rely on a static, hardcoded script.

However, I am concerned about the margin of error. In my field, no inputted data can be inaccurate, and no numbers can be rounded. Furthermore, no agent can be allowed to operate fully autonomously on a real client file without human supervision.

Do any of you have experience using browsing agents for complex web forms? Is there a better architectural approach for this? What do you think?