{ "schema": "varexis-index-free-publication-preview/1", "catalogue_version": "ice-10-tranche-70-v1", "route_id": "agentic_reviewed_claude_code_skill_frontmatter_fallback", "record_id": "VXI-EXT-ICE10-CLAUDE-CODE-SKILL-FRONTMATTER-FALLBACK-01-v1", "question": "Can malformed Claude Code skill frontmatter fail open to default invocation behaviour?", "answer": "The captured Claude Code guide says unrecognised fields are ignored, frontmatter is read only when the opening marker is the first line, and unparseable YAML still loads the skill with no fields set.", "records": [ { "record_id": "VXI-EXT-ICE10-CLAUDE-CODE-SKILL-FRONTMATTER-FALLBACK-01-v1", "url": "/varexis-index/records/claude-code-skill-frontmatter-fallback.json", "content_sha256": "77703eaea0960940918d90333d314eae197ada92c3431d9e0e129014701b3fbd", "evidence": { "schema": "varexis-public-evidence-record/0.3", "generated_at_utc": "2026-10-30T18:53:33.881Z", "record_id": "VXI-EXT-ICE10-CLAUDE-CODE-SKILL-FRONTMATTER-FALLBACK-01-v1", "record_kind": "external_reference", "title": "Malformed or ignored Claude Code frontmatter versus intended invocation restriction", "system": "Anthropic", "evidence_family": "vendor_evidence_review", "index_status": "PUBLIC_SAFE_SOURCE_REVIEW", "evidence_state": "PRIMARY_DOCUMENTATION_REVIEW_ONLY", "canonical_question": "Can malformed Claude Code skill frontmatter fail open to default invocation behaviour?", "near_questions": [ "Does malformed Claude Code frontmatter prevent a skill from loading?", "Are unknown Claude Code skill metadata fields enforced?", "What happens when skill frontmatter is not on the first line?", "Can a loaded Claude Code skill have ignored policy metadata?" ], "supported_claims": [ { "claim": "The captured Claude Code guide says unrecognised fields are ignored, frontmatter is read only when the opening marker is the first line, and unparseable YAML still loads the skill with no fields set.", "reliance": "DOCUMENTED_CAPABILITY_ONLY" } ], "not_demonstrated_claims": [ "Do not assume a misspelled or malformed restriction prevents loading; inspect parsed behaviour in the pinned client.", "Buyer implementation, live runtime enforcement, settled payment, verified deletion or certification are not established.", "No expanded capabilities or licences for existing INDEX executables." ], "public_summary": "The captured Claude Code guide says unrecognised fields are ignored, frontmatter is read only when the opening marker is the first line, and unparseable YAML still loads the skill with no fields set.", "related_record_ids": [], "source_review": { "source_type": "official_external_documentation", "source_title": "Anthropic primary documentation: claude code skills", "source_url": "https://code.claude.com/docs/en/skills.md", "checked_on": "2026-10-30", "candidate_record_id": "VXI-EXT-ICE10-CLAUDE-CODE-SKILL-FRONTMATTER-FALLBACK-01-v1", "candidate_record_sha256": "742a12fdd5f7fe605a719c61f3dd235b24f5a6997959fa25d30ec1af03ac3d5d", "method": "Primary documentation reviewed for the published bounded statement.", "deployment_tested_by_varexis": false, "revalidation": "The delivered snapshot preserves the review date shown. Recheck current primary documentation and deployment context before relying on present applicability; payment does not trigger fresh research." }, "answer_policy": { "classification": "DOCUMENTED_WITH_DEPLOYMENT_BOUNDARY", "bounded_answer": "The captured Claude Code guide says unrecognised fields are ignored, frontmatter is read only when the opening marker is the first line, and unparseable YAML still loads the skill with no fields set.", "required_buyer_context": "raw SKILL.md bytes; parser/client version; intended invocation restrictions; loaded metadata. Buyer deployment not inspected.", "missing_evidence": "A broader claim needs evidence matching the intended use. 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