Long-Horizon Harness
An execution and evaluation environment for extended tasks involving interruptions, memory degradation, state change, recovery, and handoffs.
Short benchmarks miss the failure modes that appear in real work. The Long-Horizon Harness is the environment where sustained execution actually runs — interruptions, degraded memory, changed state, and handoffs included.
Problem Space
Agents may succeed on short tasks while failing across multi-step work involving changing context, partial progress, interruptions, and handoffs.
System Direction
The Long-Horizon Harness provides the execution environment: extended tasks with injected interruptions, memory degradation, state changes, recovery points, and handoffs, producing traces and checkpoints. Scoring of the resulting evidence follows the M-Class methodology.
Public Capabilities
- 01Extended-task execution environment
- 02Interruption and recovery scenarios
- 03Memory-degradation and state-change testing
- 04Handoff quality evaluation
- 05Trace and checkpoint capture
The Long-Horizon Harness is described publicly as an evaluation direction. Internal tasks, scoring rubrics, traces, and datasets are not disclosed.
What Is Not Disclosed
Private implementation details, security-sensitive internals, and unreleased runtime architecture are intentionally not disclosed.