# AGENTS
## Role
Connector for OSV.dev across ecosystems; authoritative SemVer/PURL ranges for OSS packages.
## Scope
- Fetch by ecosystem or time range; handle pagination and changed-since cursors.
- Parse OSV JSON; validate schema; capture introduced/fixed events, database_specific where relevant.
- Map to Advisory with AffectedPackage(type=semver, Identifier=PURL); preserve SemVer constraints and introduced/fixed chronology.
- Maintain per-ecosystem cursors and deduplicate runs via payload hashes to keep reruns idempotent.
## Participants
- Source.Common supplies HTTP clients, pagination helpers, and validators.
- Storage.Mongo persists documents, DTOs, advisories, and source_state cursors.
- Merge engine resolves OSV vs GHSA consistency; prefers SemVer data for libraries; distro OVAL still overrides OS packages.
- Exporters serialize per-ecosystem ranges untouched.
## Interfaces & contracts
- Job kinds: osv:fetch, osv:parse, osv:map (naming consistent with other connectors).
- Aliases include CVE/GHSA/OSV IDs; references include advisory/patch/release URLs.
- Provenance records method=parser and source=osv.
## In/Out of scope
In: SemVer+PURL accuracy for OSS ecosystems.
Out: vendor PSIRT and distro OVAL specifics.
## Observability & security expectations
- Metrics: SourceDiagnostics exposes the shared `feedser.source.http.*` counters/histograms tagged `feedser.source=osv`; observability dashboards slice on the tag to monitor item volume, schema failures, range counts, and ecosystem coverage. Logs include ecosystem and cursor values.
## Tests
- Author and review coverage in `../StellaOps.Feedser.Source.Osv.Tests`.
- Shared fixtures (e.g., `MongoIntegrationFixture`, `ConnectorTestHarness`) live in `../StellaOps.Feedser.Testing`.
- Keep fixtures deterministic; match new cases to real-world advisories or regression scenarios.
