Enumerates security threats against a feature specification or design using Microsoft's six STRIDE categories (spoofing, tampering, repudiation, information disclosure, denial of service, elevation of privilege), each paired with the security property it violates. Covers the asset-and-trust-boundary walk that produces threat rows, the threat-row output schema, a likelihood x impact triage rule labelled plainly as practitioner convention rather than standard, a worked example, an anti-pattern catalog, and the from-spec workflow: read the spec, run the walk end to end, and write the threat-model document into the repo, with a no-fabrication rule for asset-free specs. Enumer…