# Oikos — the operating model

Oikos (Greek: *household*) is the agent operating system layered on this
repo. It is not new infrastructure: `inventory.yaml` is the kernel data
structure, the `homelab` CLI and MCP server are the syscall surface, and
this page defines the rules everything above them follows.

Read this after [AGENTS.md](AGENTS.md). Machine-readable companions:
[oikos/ontology.yaml](oikos/ontology.yaml) (systems model),
[oikos/policy.yaml](oikos/policy.yaml) (risk & approval).

## The kernel loop: OODA

Every Oikos activity — scheduled probe, agent task, operator request — is
one pass through **Observe → Orient → Decide → Act**:

1. **Observe** — probes, drift detectors, and agent findings produce
   **Signals** (structured records, not loose messages): pending updates,
   high temperature, low disk, service down, cert expiry, stale backup,
   inventory drift.
2. **Orient** — walk the ontology graph: what entity is affected, what
   depends on it (blast radius), its lifecycle state, whether a runbook
   matches, what the ledger says about past attempts.
3. **Decide** — the classifier scores **risk class × blast radius ×
   confidence** and routes:
   - **auto-act**: within autonomy policy, high confidence, contained radius
   - **escalate**: operator approval via Matrix (✅/❌ reaction; destructive
     actions additionally need a typed confirmation phrase)
   - **queue**: informational — console + reports
   The classifier can only *lower* autonomy relative to policy, never raise
   it. When in doubt, escalate.
4. **Act** — execute through `homelab` commands or runbooks (never ad-hoc
   SSH), then **verify** with the action's verification command, write a
   **ledger** entry, resolve the Signal, and update docs in the same session.

## Primitives

| Primitive | What it is | Lives in |
|---|---|---|
| Host / Service | topology entities | `inventory.yaml` (+ generated `hosts/*.yaml`) |
| Secret | SOPS+age encrypted value, per-client recipients | `secrets/` + `.sops.yaml` |
| Runbook | executable workflow with risk class + verification | `runbooks/` (Week 2) |
| Signal | something needing attention, with lifecycle | `signals/` ledger (Week 3) |
| Change | one mutation: who, what, risk, approval, verification | `ledger/` (Week 2) |
| Approval | short-TTL signed grant for a gated action | approval engine (Week 3) |
| Incident | investigation narrative | `investigations/` |
| Plan | design doc for non-trivial work | `plans/` |
| Agent | enrolled client identity = its age pubkey | `inventory.yaml` + `.sops.yaml` |

## Risk classes (enforced, not advisory)

From [oikos/policy.yaml](oikos/policy.yaml):

- **read_only** — status, logs, docs, inventory. Unattended.
- **reversible_low** — restart, cache clear, sync pull. Unattended + ledger.
- **config_mutation** — tracked-config edits (commit+push, never local),
  deploys, upgrades, DNS/ingress changes. Operator approval.
- **destructive** — destroy, format, wipe, rotate, revoke. Approval +
  typed confirmation phrase.

Lifecycle gates modify these: `provisioning` nodes are freely mutable
(nothing depends on them); `deprecated` nodes accept no new dependents;
anything touching a `destroyed` node is drift.

## The systems model

Eight domains — physical, compute, network, storage, software,
identity & access, operations, external — cover everything in the lab;
entities are connected by typed edges (`hosts`, `provides`, `mounts`,
`stores-on`, `routes-to`, `can-decrypt`, `depends-on`, `backs-up-to`, …)
defined in [oikos/ontology.yaml](oikos/ontology.yaml). Rule of
completeness: **if it can break, be changed, or hold data, it has an
entity and edges.** Blast-radius questions ("what breaks if strong goes
down?") are graph walks, not doc archaeology.

Nodes move through an explicit lifecycle —
`planned → provisioning → active → migrating → deprecated → destroyed` —
stored as `state:` in inventory (absent = active). Destroyed nodes live in
the `archaeology:` section. Each transition is a runbook checklist;
deprecation completes only when inbound edges reach zero.

Generated views: [infrastructure/topology.md](infrastructure/topology.md)
(Mermaid, regenerated from inventory).

## Conventions carried forward

- Inventory is the truth; live state wins over narrative docs.
- Prefer `homelab` CLI and MCP over ad-hoc SSH.
- Meaningful changes update docs in the same session.
- Secrets are decrypted locally via per-client keys; never into docs/comments.
- Tracked configs change by commit + push, not local edits.
- Netbird is the preferred mesh path for new traffic.
- Agents are terse ([CAVEMAN.md](CAVEMAN.md)), verify claims, and fix
  collateral drift when found.

## Build status (30-day roadmap, started 2026-07-05)

- **Week 1**: policy, ontology, service contract, archaeology, topology
  generator, this brief. Shipped.
- **Week 2**: context cards, `homelab service <name> …`, change ledger,
  `node relations`, runbooks. Shipped.
- **Week 3**: ops scheduler + state cache (`homelab service <name> health`
  is cache-first, `--live` forces a probe), drift detectors, signal engine
  (`homelab signal …`), decision classifier (`homelab decide …`), approval
  engine (`homelab approval …` — shared-HMAC grants; Matrix delivery is
  Hermes's existing `@dtoro:avispero` send path, not a new bot, see
  `oikos/approve.py`), daily brief + weekly report (`oikos/report.py`).
  Shipped, except: Prometheus is still `planned` (see
  [plans/2026-07-05-oikos-prometheus-lxc.md](plans/2026-07-05-oikos-prometheus-lxc.md)) —
  trend signals (disk-full prediction, temp creep) wait on that LXC; the
  scheduler's disk check today is point-in-time only, and CPU/NVMe
  temperature isn't probed at all yet (no confirmed sensor path on
  hubris/strong). DNS-vs-inventory and generic tracked-config-cleanliness
  drift checks are also deferred (see `oikos/drift.py` docstring).
- **Week 4**: Oikos Console (oikos.hubris.network, behind Authentik with
  step-up re-auth on approvals), per-agent age-key-signed approval
  requests (upgrading from Week 3's shared-HMAC), docs pass, 60/90-day
  backlog.

### Real drift found while building Week 3 (unresolved, needs operator action)

The drift detectors surfaced genuine, currently-true findings on first
run against production — recorded here rather than silently fixed, since
each is a `config_mutation`/`destructive`-class decision:

- `republic-laptop` has no `age_pubkey:` in `inventory.yaml`, but its real
  age key is granted on nearly every shared secret in `.sops.yaml`
  (`age1vf8h7...`) — the enrollment write-back to inventory never
  happened. Fix: `homelab client add republic-laptop --finalize-pubkey
  age1vf8h7s8mqsn2q5eadgpdupsj4mwn8zguc77d85ws3xj40sl9rgksx2rxw6`.
- `grimmory` has an `age_pubkey` in inventory but is missing from
  `secrets/hello.yaml`'s recipient list — incomplete enrollment the
  other direction. Fix: re-run `homelab client add grimmory
  --finalize-pubkey <its key>`.
- `pve_id 131` exists live on hubris (`pct list`) with no inventory entry
  — investigate before assuming it's a stale ID (see the Prometheus LXC
  plan doc above, which flags this explicitly).
- Three `lifecycle-pve-id-reuse` info findings (100, 106, 107 each shared
  between an active host and an archaeology entry) — expected/benign ID
  reuse after destroy, no action needed.