The rules view

The reason Vejas keeps flows as one screen of readable VejasScript is so the meaning — the thresholds, the mappings, the routing conditions — is visible and correctable by the person who owns it, not buried in code (ADR-0019). The rules view is where a domain expert reads and fixes that meaning without touching logic.

The business surface

Every flow’s editable meaning — its constants, transcoding tables, and mappings — is the business surface. It self-describes at GET /surface (vejas_surface):

{ "name": "SEVERITY_CODES", "kind": "table",
  "value": { "critique": "P1", "haute": "P2", "normale": "P3", "basse": "P4" } }

The panel renders each entry as an editable card; the agent reads the same surface to know what it may safely change.

Rules as sentences

Beyond the raw literals, the rules view projects a flow’s decision branches into plain conditions — GET /rules?file=<flow>:

{ "rules": [
    { "kind": "if", "when": "severity in ALERT_SEVERITIES",
      "then": ["→ vx.slack.out"], "literals": ["ALERT_SEVERITIES"],
      "projectable": true } ]}

You read “when severity is in ALERT_SEVERITIES, alert Slack” — and the literals tell you exactly which value to edit to change who gets alerted. A branch that is too dynamic to project cleanly is marked projectable: false and shown as its raw source rather than a misleading sentence.

Correcting a value

Editing one entry is a promote:

• Panel: change the card → Apply.
• API: POST /surface/set; agent: vejas_set_literal.

It hot-reloads that flow — the one unit picks up the new value, no process restart and no deploy. And you don’t do it blind: Apply previews the change against real traffic first (shadow-replay), so you see what would have differed before you commit. That whole safety story — preview, promote, roll back, canary — is change safely.

Why this is the differentiator

Anyone can generate glue that moves data. The thing an integration platform rarely gives you is a place where the person who knows the business can correct what a rule means — live, previewed, and audited — while the person who knows the plumbing keeps owning the plumbing. The rules view is that place.