The question
How does testing an assistant versus a squad affect what a simulation actually validates about the implementation?
What the Review Identified
One finding illustrates the implementation risk examined in this area.
Individual assistants can each pass their own simulations while the composed squad introduces additional behavior that those isolated tests do not exercise, including routing, handoffs, and context transfer between assistants.
What we investigated
We examined how simulations target individual assistants or squads, and what additional implementation behavior is exercised when multiple assistants operate together.
What we found
An individual assistant simulation validates that assistant under the tested scenario.
A squad simulation exercises the composed behavior of the configured assistants, including the interactions and transitions between them.
Passing tests for individual assistants therefore do not automatically establish that the squad implementation works correctly as a whole.
Why it matters
A developer can test each assistant independently and see successful results while leaving the handoff, routing, context transfer, or downstream behavior between those assistants untested.
The composed implementation needs to be exercised as the target when those interactions matter.
Evidence
A comparison between individual assistant testing and squad testing shows that the squad introduces an additional implementation layer: the behavior between assistants, rather than only the behavior of each assistant in isolation.
Result
Individual assistant tests provide evidence about individual behavior. A squad simulation provides evidence about the configured end-to-end interaction between the assistants under the tested conditions.
Implementation implication
Developers need to distinguish between validating each assistant independently and validating the composed squad. A successful individual assistant test does not by itself validate the handoffs, routing, or context transfer required by the squad.
What This Demonstrates
Testing assistants individually validates their behavior in isolation. It does not automatically establish that the composed squad behaves correctly across the interactions between those assistants.
In practice: individually successful assistants can still expose handoff or context-transfer problems when they are composed into the production squad.