Decisions · 21Decisions 21 decision records, in number orderDecisionStatusDateADR-0001 Cairn as an AI-Native Artifact StoreACCEPTED2026-07-08ADR-0002 Extensible Share-Type Model with a Viewer RegistryACCEPTED2026-07-08ADR-0003 Triple-Surface Parity — Web, CLI, and MCP over One Core ServiceACCEPTED2026-07-08ADR-0004 MCP as a First-Class Surface with OAuth AuthorizationACCEPTED2026-07-08ADR-0005 Short Opaque Identifiers and the URL SchemeACCEPTED2026-07-08ADR-0006 Unified Annotation Layer — Reactions & Comments with Typed AnchorsACCEPTED2026-07-08ADR-0007 Provenance, Link-Based Access Control, and Default ExpiryACCEPTED2026-07-08ADR-0008 Storage & Content Model — Blob Bodies, Metadata, Content AddressingACCEPTED2026-07-08ADR-0009 Trajectory Capture and the OTel-Inspired Span ModelACCEPTED2026-07-08ADR-0010 Live Webhook Endpoints and Real-Time Stream CaptureACCEPTED2026-07-08ADR-0011 Frontend Architecture and the Unified App ShellACCEPTED2026-07-08ADR-0012 Backend Platform and API ShapeACCEPTED2026-07-08ADR-0013 Native OIDC Relying Party for Human AuthACCEPTED2026-07-09ADR-0014 The Public Site Is the Design RecordACCEPTED2026-07-25ADR-0015 OTLP Trace Ingestion as a Translation AdapterPROPOSED2026-07-29ADR-0016 Traces, Not TrajectoriesACCEPTED2026-07-29ADR-0017 Outbound Webhooks on Artifact CreationPROPOSED2026-09-06ADR-0018 Client-Asserted Artifact TagsPROPOSED2026-09-11ADR-0019 GitHub as an Additional Human Auth ProviderPROPOSED2026-09-13ADR-0020 The Single-Binary Runtime — Docs Served From the Cairnd ProcessPROPOSED2026-09-13ADR-0021 Cairn Exposes Prometheus Metrics, Led by Storage and ExpiryACCEPTED2026-09-15