| Criterion | Agent observability dashboard | Rehearsal telemetry software |
| Primary user | Engineer, platform owner, infrastructure team, or agent framework maintainer. | Operator, founder, support lead, executive assistant, or personal agent owner. |
| Primary question | What happened during the run, and why did it fail or cost more than expected? | Does this proposed action have enough evidence, permission, freshness, and recovery coverage to proceed? |
| Best data | Traces, tool calls, model responses, latency, exceptions, retries, token usage, and cost. | Intent preview, source evidence, consent boundary, stale context warnings, operator corrections, and receipts. |
| Risk posture | Improves reliability after observing runs. | Improves governance before allowing actions. |
| Best fit | Complex agent systems with many tool paths and engineering owners. | Personal AI agents acting across messages, browsers, calendars, customer records, publishing tools, and receipts. |