reporting

name	reporting
description	Deterministic multi-format reporting architecture, serialization schemas, sanitization, and safe output writing in PcapRaven.

Reporting Skill

This skill governs the design, implementation, review, and verification of the pcapraven-reporting crate, DTO schemas, and structured output formats (table, json, ndjson, csv). The canonical schema owner is docs/REPORTING.md. The Phase 22 source-backed evidence ledger is docs/REPORTING_SCHEMA_V1_AUDIT.md.

Core Invariants

1. Domain Model Purity: pcapraven-domain must remain pure std and never depend on serde, serde_json, csv, or any third-party serializer. All serializable structures reside in pcapraven-reporting::dto.
2. Schema Versioning Anchor: All structured outputs anchor to REPORT_SCHEMA_VERSION = "v1.0".
3. Wide Integer String Policy: All 64-bit and larger integers (u64, i64, u128, i128, usize), packet/flow/observation/evidence/finding ordinals, and sample counts serialize as decimal string tokens (String). Standard protocol types (u8, u16, u32, bool) remain JSON numbers/booleans.
4. Duration and Ratio Exactness: DurationDto and RatioDto serialize numerator and denominator as decimal strings and preserve their existing display/string-representation fields. Durations and ratios never use floating-point numbers.
5. Complete Evidence Provenance: EvidenceRecordDto includes packet_references, flow_references, observation_references, structured measurements, and limitations.
6. Full Machine Flow Projection: FlowRecordDto includes 4-directional traffic counters (total, a_to_b, b_to_a, same_endpoint), timestamp coverage, exact timestamps, and inter-arrival statistics.
7. Unified Observation Identity: For analyze, ProtocolObservationDto preserves ObservationReference, protocol kind, completeness, and ObservationFlowAssociation.
8. Filter Metadata and Evidence Closure: Filtered reports serialize FindingFilterDto and restrict emitted evidence records to only those referenced by retained findings.
9. Whole-Analysis Completion: ReportCompletionDto captures status and structured limitations reflecting reader, flow, observation, and detection completeness.
10. Self-Describing NDJSON: Every NDJSON line is a tagged envelope: {"schema_version": "v1.0", "kind": "...", "record_type": "...", "data": { ... }} in canonical record order.
11. Strict LF CSV: CSV output uses explicit LF (\n) line endings across all platforms with no BOM.
12. CSV Formula Injection Defense: Untrusted string values starting with =, +, -, @, \t, \r, \n or whitespace followed by =, +, -, @ are prefixed with ' without mutating or trimming original content.
13. Safe Output Lifecycle: with_output_sink creates files exclusively via create_new(true), flushes explicitly, cleans up newly created files on failure, and returns Exit Code 2 on collision.
14. Null and Empty Array Invariants: None serializes as null; empty collections serialize as [].
15. Schema Freeze Policy: REPORT_SCHEMA_VERSION remains "v1.0" for the audited contract. After Phase 22 acceptance, breaking changes to fields, types, nullability, tokens, tagged values, reference grammar, envelopes, ordering, CSV headers, missing values, integer representation, or rational representation require explicit user approval and a schema-versioning decision.

Verification

• Schema contract tests in crates/pcapraven-reporting/tests/schema_contract.rs.
• Format projection and formula defense tests in crates/pcapraven-reporting/tests/reporting.rs.
• CLI integration tests in crates/pcapraven-cli/tests/cli.rs.