A context engineer wants to reduce input-token use before introducing lossy summarization. Which two changes should be evaluated? Select 2 answers.

1. Remove the user's current constraints before removing duplicate boilerplate.
2. Append the entire organization's wiki to every request.
3. Return all historical tool results even when a compact result is sufficient.
4. Retrieve only the evidence relevant to the current task step.
5. Expose only the tool schemas relevant to the current task stage.