A small diff is easier to trust
Use specialist proposals to keep source changes reviewable.
Start with one behavior
Give the agent an observable problem: loading stays enabled after a failed search, or a user can update a project they do not own. Ask it to read the affected code and explain the cause before changing it.
Review the proposal
Use Suggest changes to save a proposed edit. Read the before and after source and check whether it covers the failure path. A focused edit is easier to test and easier to undo.
Verify and export
Apply the change to the working copy when you are satisfied. Export your accepted source and run the affected flow in your own environment. Bisc does not execute the app, so a successful proposal still needs that final check.