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Auto-VEX Drafting Attestation

Module

Attestor

Status

VERIFIED

Description

VEX draft generation attestation types for AI-generated VEX statements with justifications, enabling lattice-aware merge preview.

Implementation Details

  • AIVexDraftPredicate: src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Predicates/AI/AIVexDraftPredicate.cs -- extends AIArtifactBasePredicate with VEX-specific draft fields.
  • AIVexStatementDraft: AIVexStatementDraft.cs -- individual VEX statement draft with status, justification, and product/vulnerability references.
  • AIVexJustification: AIVexJustification.cs -- AI-generated justification for VEX status decisions.
  • Classifier Integration: AIAuthorityClassifier.VexDraft.cs and AIAuthorityClassifier.VexDraftScore.cs -- classifies VEX drafts into Suggestion/EvidenceBacked/AuthorityThreshold.
  • Statement: src/Attestor/__Libraries/StellaOps.Attestor.ProofChain/Statements/AIVexDraftStatement.cs -- wraps VEX draft as in-toto statement.
  • VEX Predicate: __Libraries/StellaOps.Attestor.ProofChain/Predicates/VexPredicate.cs -- base VEX predicate. VexAttestationPredicate.cs -- VEX attestation predicate.
  • VEX Override System: src/Attestor/__Libraries/StellaOps.Attestor.StandardPredicates/VexOverride/ -- VexOverridePredicateBuilder.cs (with .Build, .Serialize, .WithMethods), VexOverridePredicateParser.cs (with multiple partials) for building and parsing VEX overrides.
  • VEX Proof Integration: __Libraries/StellaOps.Attestor.ProofChain/Generators/VexProofIntegrator.cs (with .Helpers, .Metadata) and VexVerdictProofPayload.cs -- integrates VEX drafts into the proof chain.

E2E Test Plan

  • Create an AIVexDraftPredicate with multiple AIVexStatementDraft entries (not_affected, affected, under_investigation) and verify JSON serialization preserves all fields
  • Create a VEX draft with AIVexJustification containing evidence citations and classify via AIAuthorityClassifier.VexDraft, verifying EvidenceBacked authority when citations are sufficient
  • Wrap the VEX draft in AIVexDraftStatement and verify it produces a valid in-toto statement with correct predicate type
  • Build a VexOverridePredicate from an AI-generated draft via VexOverridePredicateBuilder and verify the override captures the draft's justification
  • Parse a serialized VEX override via VexOverridePredicateParser and verify all fields round-trip correctly
  • Integrate a VEX draft into the proof chain via VexProofIntegrator and verify the proof payload contains the draft evidence

Verification

Check Result
Tier 0 - Source Verification PASS
Tier 1 - Build + Code Review PASS
Tier 2 - Behavioral Verification PASS
Verified Date 2026-02-13
Run ID run-001