Skip to main content
Original Research — Stahl Systems

104 Failure Modes.
247 Incidents.
19 Project Spaces.

The first bidirectional taxonomy of human-AI collaborative failure.

Empirically derived from 129 structured incidents across 21 Claude project spaces. Covers AI errors (Direction A), human-process errors (Direction B), and 9 cross-project failure patterns.

104

Failure modes catalogued

247+

Qualifying incidents analyzed

103

Direction A — AI errors

1

Direction B — human error

13

CRITICAL-severity incidents

Key Finding

Fabrication represents 13.1% of incidents but accounts for 46% of all CRITICAL severity incidents. When AI fabricates, it tends to be catastrophic. When it makes process or quality errors, they tend to be medium or low severity.