# Sequence — <flow name> (/docs/maintain/_templates/sequence)

- **Status:** Draft
- **Last updated:** YYYY-MM-DD
- **Related ADRs:** ADR-NNNN

> Snapshot of the system as it stands today. Edit in place; never record what changed.

## Trigger [#trigger]

What starts this flow, and the preconditions that must hold.

## Diagram [#diagram]

Draw this diagram with Archify too. In a copy, wrap the fence in
`<Diagram src="/diagrams/<project-slug>/<slug>.html" title="…">` … `</Diagram>`, with nothing else
inside: the page shows the Archify view and its Markdown the Mermaid. Outside the templates, a
bare Mermaid fence fails the build (ADR-0022).

```mermaid
sequenceDiagram
  autonumber
  actor R as Reader
  participant B as Browser
  participant S as Site
  participant X as External service

  R->>B: action
  B->>S: request
  S->>X: call
  X-->>S: result
  S-->>B: response
  B-->>R: outcome
```

## Failure paths [#failure-paths]

| Step | Failure | Behaviour | Recovery |
|---|---|---|---|

## Post-conditions [#post-conditions]

What is true once the flow completes, including what was written or published.