system-prompts-and-models-o.../docs/ws5-connector-events-metrics.md
Sami Assiri b4531f0a4c feat(tier1): docs-governance CI, evidence gate, closure artifacts, trust/execution docs
- Replace repo-preflight with docs-governance workflow and check_docs_links.py
- Class B bundle: require correlation_id for external_*; AuditMetadata trace fields
- Root-safe TIER1 §2; optional .githooks pre-push for main
- Add RELEASE_READINESS_MATRIX_AR, SOURCE_OF_TRUTH_INDEX, operational severity, external index
- ExecWeeklyGovernanceContract; expand trust-fabric, execution-fabric, ADR-0001, ws5, Saudi overlays
- Wire MASTER TOC, enterprise-readiness, completion-program, architecture_brief paths

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# WS5 — Connector facade, events, semantic metrics (completion)
## Connector facade standard (required for new integrations)
Each connector MUST document: **contract**, **version**, **retry**, **timeout**, **idempotency key**, **approval policy hook**, **audit field mapping**, **observability hooks**, **rollback notes**.
Pattern reference: [`governance/connectors-and-data-plane.md`](governance/connectors-and-data-plane.md).
**Rule:** No new agent path may call a vendor SDK directly for a production integration; add a facade module under `salesflow-saas/backend/app/services/integrations/` (or agreed package) with tests.
## Event envelope and schema registry
- Envelope fields: see [`governance/events-and-schema.md`](governance/events-and-schema.md).
- Registry: start with versioned JSON Schema under `docs/schemas/events/` (create per event family) before adopting a hosted registry.
## Semantic metrics dictionary
Authoritative definitions: [`semantic-metrics-dictionary.md`](semantic-metrics-dictionary.md). Application code must import metric keys from a single module once introduced (WS5 follow-up PR).
## Lineage / catalog
Single choice documented in [`lineage-catalog-choice.md`](lineage-catalog-choice.md) until an ADR changes it.
---
## Dual connector strategy (runtime tools vs data movement)
| Layer | Purpose | Examples | Governance |
|-------|---------|-----------|------------|
| **Runtime tool connectors** | LLM/agent tool calls during a session (read/write bounded) | MCP tools, built-in HTTP tools behind facade | Decision plane + tool verification + allowlists |
| **Data movement connectors** | Scheduled/batch replication or sync between systems | ELT/CDC-style pipelines (Airbyte-class) | Execution plane ownership, SLAs, backfill runbooks |
**Rule:** never confuse the two in architecture diagrams — they share “connector” language but have different failure domains, retention, and approval classes.
### MCP Tasks / async operations (watchlist)
Long-running MCP operations (tasks that outlive a single HTTP interaction) MUST have: visible **status polling** or webhook, **timeout**, **idempotency key**, and an owner in [`semantic-metrics-dictionary.md`](semantic-metrics-dictionary.md) or the connector runbook. Track vendor-specific “MCP Tasks” behavior as **V1V2** severity candidates when SLAs slip — see [`governance/operational-severity-model.md`](governance/operational-severity-model.md). External overview: [`references/tier1-external-index.md`](references/tier1-external-index.md) (Airbyte MCP).
---
## Great Expectations (GE) as a release gate
When GE is in-path:
- Tie **checkpoint success** explicitly to [`RELEASE_READINESS_MATRIX_AR.md`](RELEASE_READINESS_MATRIX_AR.md) (row: schema adherence / data quality) and to promotion of workflows that consume the underlying datasets.
- Failed checkpoints are **V2** by default if customer reports or downstream models consume the data; **V3** if PII/regulated fields are involved.
Reference: GE checkpoints — [`references/tier1-external-index.md`](references/tier1-external-index.md).