Skip to content
MCP Lab

Reporting

The console reporter shows the scenario name, observed outcome, duration, assertion status, and failures. The JSON reporter emits a stable machine-readable structure.

{
  "name": "bounded delay succeeds",
  "outcome": "success",
  "durationMs": 251.25,
  "passed": true,
  "failures": []
}

When an observer is configured, the report includes a separate observer object with its outcome, duration, pass state, failures, returned result, or execution error.

Terminal window
npm run dev -- run examples/scenarios/delay-observe-ping.json --report json

Input and execution failures also produce JSON when JSON reporting is selected. Reporters return formatted output to the command layer; they do not write to stdout themselves.