A monitoring agent is used on platforms such as UpWork, where you often deal with untrusted contractors for hourly contracts. That is a part of the contract that both sides need to agree on before starting any work.
The screenshots can then be as part of the dispute resolution process, and can also protect the contractor in case of disputes from unscrupulous companies.
The agent captures screenshots every few minutes, and the contractor can review and redact any screenshots before sending them.
Adding a monitoring agent for an existing contractor is a major change in the contract terms, and not something that I would consider acceptable.
It's not normal, and not something you should agree to.
The screenshots can then be as part of the dispute resolution process, and can also protect the contractor in case of disputes from unscrupulous companies.
The agent captures screenshots every few minutes, and the contractor can review and redact any screenshots before sending them.
Adding a monitoring agent for an existing contractor is a major change in the contract terms, and not something that I would consider acceptable.
It's not normal, and not something you should agree to.