The short version
Trust isn't built over years. It's built in the first few interactions, and most teams waste them on logistics.
Newly formed teams spend their first week on tooling, access, and calendars. The teams that get to high performance fastest spend part of that week on something else: agreeing out loud about how they will work.
One: explicit working agreements
Response-time expectations, how decisions get made, what counts as an emergency, how to say no. Written down in thirty minutes, revisited in a month. The content matters less than the fact that it's shared rather than assumed.
Two: small promises, kept fast
Trust compounds from tiny reliability events. Commit to a small thing with a date, deliver it early, and repeat. Two weeks of that beats a workshop.
Reliability at small scale is what makes people willing to depend on you at large scale.
Three: disagree early, in public
A team that has never disagreed doesn't know whether disagreement is safe. Surfacing a real difference in week one — and handling it well — settles the question before the stakes are high.
None of this takes long. It just has to happen before the habits set.
Related resource
Team Norms Template
A one-page template for writing down how your team meets, decides, and disagrees — then reviewing it every quarter.
Get the Team Norms Template