# Operations domain — schema

The operations domain holds the procedural and time-stamped documentation: runbooks (repeatable
procedures), investigations (incident evidence), and plans (design docs for non-trivial work). It
follows [writing-style](../../shared/writing-style.md); runbooks and plans use the imperative voice
exception.

## Plans always live in `plans/`

**Any plan or design doc for the Homelab is written into the repo `plans/` folder as
`plans/YYYY-MM-DD-slug.md` — never a scratch path, an agent-private plan location, or a chat
message.** An agent drafting a plan:

1. Writes the file under `plans/` using the plan template in [page-templates.md](../../shared/page-templates.md).
2. Lists it in `plans/index.md`.
3. On completion, moves it to `plans/done/` and updates the index status.

This is the single source for homelab design intent; keeping it in-repo means the plan is
versioned, reviewable, and reachable by MCP `get_page`/`search_docs` like any other doc.

## Runbooks

Repeatable procedures live in `runbooks/<name>.md` with YAML front-matter that the Oikos policy and
lifecycle machinery reads:

```yaml
---
name: <name>
risk_class: read_only | reversible_low | config_mutation | destructive
inputs: [<param>, ...]
verification: "<shell expression that proves success>"
docs_update_checklist: [<doc artifacts to update>]
transition: "<from> -> <to>"   # only for lifecycle runbooks
---
```

`risk_class` values and the lifecycle `transition` states must match
[`oikos/policy.yaml`](../../../oikos/policy.yaml) and [`oikos/ontology.yaml`](../../../oikos/ontology.yaml).

## Investigations

Incident records live in `investigations/YYYY-MM-DD-slug.md` and are **evidence sources** — written
once at incident time, then linked from the changelogs of the nodes they implicate. Sections:
`## Summary`, `## Timeline`, `## Root cause`, `## Mitigations applied`, `## Open questions`. Resolved
incidents move to `investigations/archive/`.

## The operations log

`plans/log.md` and `investigations/log.md` are append-only records of documentation operations on
those areas (`## [YYYY-MM-DD] <op> | <summary>`), distinct from the Oikos change ledger.