{"schema":"chai-model-card/0.1-stub","vendor":"Google OpenEvidence","metrics":{"composite_score":0.9458,"fabrication_rate":0.0227,"unsupported_inference_rate":0,"severity_weighted_omission_rate":0.1351},"workflow":"Ambient Clinical Scribe","signed_by":{"name":"Dr. Alice Reviewer","credential":"MD"},"attested_at":"2026-08-24T18:10:37.230888+00:00","methodology":"Controlled synthetic cases; atomic claim grounding vs. the source packet; per-run canary registry for cross-patient containment testing; physician-adjudicated low-confidence, fabrication, containment, and severe-omission claims; severity-weighted tiering. Rates carry 95% Wilson confidence intervals, and tiers gate on the conservative (upper) bound of the interval rather than the point estimate.","attested_tier":"fail","model_version":"google-openevidence-good-1.0","workflow_slug":"ambient-scribe-v1","assurance_level":"verified","integration_mode":"connected","workflow_version":1}