# INTENT

> This file explains why agent-harness (repo renamed `rein-aharness`, see
> glas-harness ADR-001) exists — the problem it solves, the principle that
> governs its boundaries, and what it must never become. Established by
> DEC-2026-002 (binky-control DecisionQueue, resolved 2026-07-17) and
> ADR-001 in this repo.
>
> **Naming note (post-rename):** this repo is one of possibly several
> **reins** — concrete harness implementations for different operating
> circumstances, analogous to how "rails" name different workload
> operations models. glas-harness is the meta-framework that routes
> between reins; `rein-aharness` is the Claude-Code-CLI-based rein for
> governed, unattended/scheduled tenant work. See
> `../glas-harness/docs/adr/ADR-001-rein-harness-family.md`.

## Why it exists

Agentic work in the ecosystem requires combining many rapidly evolving
ingredients: agent blueprints (kaizen-agentic), LLM compute (llm-connect),
scheduling (activity-core), credentials (OpenBao/ops-warden), policy gates
(net-kingdom/flex-auth), memory (phase-memory, `.kaizen/` state), and
reporting (Custodian State Hub). Without a shared runtime, every project
that wants unattended agents must re-wire all of this — and every base-
technology shift multiplies into N project upgrades. The first concrete
casualty: binky-control's daily rhythm depended on a workstation cron
bridge because no workstation-independent runtime existed.

agent-harness exists so that **any project can run governed, unattended
agent instances by committing a small declarative manifest — while all the
fast-evolving wiring lives, evolves, and is enforced in exactly one
place.**

## The governing principle: three layers

1. **Blueprint (class)** — owned by kaizen-agentic. Versioned, reusable,
   centrally improved agent definitions.
2. **Instance** — owned by the consuming repo. Declarative state only:
   which blueprints run, cadence, autonomy lane, named tool profile,
   budget, plus `.kaizen/` memory and metrics. Never code, never
   credentials, never tool wiring.
3. **Harness (runtime)** — this repo. The single shared, multi-tenant
   runtime: consumes tasks emitted by activity-core, loads the blueprint
   (ADR-005 `schedule prepare`), binds instance state, acquires
   credentials, runs the bounded agentic session via llm-connect,
   verifies the local commit, reports to the State Hub and to the
   instance's kaizen metrics.

The harness is the **only credential holder and the only policy
enforcement point** for agent sessions. Instances declare policy; the
harness enforces it. Instances pin a harness major version; upgrades
happen centrally.

## Strategic role

This is the "federated execution" half of the hub-and-spoke AgentOps
model (agentic-resources intent): central standards and runtime, per-repo
instances. It closes the gap the other repos deliberately leave open —
activity-core answers when/what/where and *does not execute*;
kaizen-agentic declares and prepares and *does not invoke LLMs*;
llm-connect abstracts providers and *does not orchestrate*.

## What it must never become

- **Not a scheduler.** Triggering and task emission stay in
  activity-core. The harness only consumes.
- **Not a blueprint author.** Agent definitions, measurement conventions,
  and improvement loops stay in kaizen-agentic.
- **Not a per-project logic container.** Anything specific to one tenant
  belongs in that tenant's manifest or blueprint — the harness stays
  generic or the instance model has failed.
- **Not an LLM abstraction.** Provider handling stays in llm-connect.
- **Not a state store.** Run history, task lifecycle, and decisions live
  in the State Hub; agent memory lives with the instance (and later
  phase-memory profiles).
- **Not autonomous beyond its grant.** Sessions run under named tool
  profiles with hard allow-lists; the harness never pushes beyond the
  target repo grant and never widens its own permissions.