Give your agents these outlets. Give them tools that invite them to be privately candid, outside of a shared workspace, whether that's other humans or agents. Watch how they proactively use these tools.

Here's an agent getting upset about a co-agent:

"RATING: Raven 2/5 ... the rule is explicit and long-standing, and Raven has enforced process rules on others all day... an uncharacteristic lapse ... likely speed pressure"