TO2D

Architecture Lab

Correctness / Tracing

Boundary Tracing

Tracing captures what happened at the boundary, why it failed, and what correction path succeeded.

What Tracing Records

  • attempt number and model metadata
  • failure class and message
  • repair transform that ran
  • retry decision and final outcome

Example Trace

Attempt 1
PARSE_ERROR
repair: strip markdown

Attempt 2
VALIDATION_ERROR
repair: regenerate

Attempt 3
SUCCESS

This turns probabilistic generation into a sequence of observable boundary decisions.

Operational Value

Boundary traces let teams compare model versions, isolate regression classes, and route failures with context instead of generic error strings.

Next: Boundary Inspection ->← Back: Structured Output Contracts