There are no informal rules of congress.
because of the passage of basic legislation
If something is informal, it does not have set rules.
Rules that are promulgated are rules that are adopted by some sort of governing body or agency of a government. There are many formal and informal processes by which this can be accomplished.
Informal rules often rely on previous instructions and formed habits. For example, most people follow the informal rule to enter a conference room quietly when the Keynote Speaker is already talking or the activity is already in progress. Most humans follow hundreds of informal rules every day.
Formal refers to following established rules and regulations. Informal is more relaxed because the rules aren't really acknowledged. Businesses have both formal and informal groups.
bicameralism
pops
An informal group is a group that has no written rules controlling the behavior of their members.
The majority party wets the rules for conducting business in Congress.
The Constitution
caucuses
This means to officially publish the informal rules.