2026-07-26 12:29:06 +02:00
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# INTENT
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> Why rein-openweights exists, its boundary, and what it must never
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> become. Established by glas-harness
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> `docs/adr/ADR-001-rein-harness-family.md`.
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## Why it exists
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Every current agent harness in the ecosystem (Claude Code, Grok CLI,
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Codex/GPT CLI) is a frontier-model-vendor harness: it only drives that
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vendor's own model. There is no way to run a current open-weight model
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through an equivalent agentic tool-use loop (plan → tool call → observe →
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repeat, with a bounded tool policy) without building one from scratch per
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occasion.
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rein-openweights exists to be that harness: one agentic loop, model
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2026-07-26 13:37:09 +02:00
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supplied via OpenRouter, usable anywhere a rein-aharness-equivalent
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session is wanted but a frontier-vendor dependency is not —
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cost-sensitive workloads, offline/degraded-network tolerance, or simply
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comparing open-weight model capability against frontier baselines on
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the same task.
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2026-07-26 12:29:06 +02:00
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## Governing principle
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It is a **rein** — a concrete harness backend under glas-harness's
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router, implementing the same harness contract as `rein-aharness`
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(session lifecycle, tool dispatch + policy, sandbox consumption via
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sand-boxer, State Hub reporting). It does not reimplement any of that
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framework machinery itself; glas-harness owns the contract, this repo
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owns the open-weight-model-specific agentic loop and tool execution.
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## What it must never become
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- **Not a model router.** Choosing which OpenRouter model to use for a
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2026-07-26 13:37:09 +02:00
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given task, pricing, and fallback is a caller/config concern (`--model`),
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not logic this repo owns. `llm-connect` remains available as an
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optional dependency for future needs (structured-JSON side calls,
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diagnostics/replay) but is not load-bearing for the base agentic loop
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— see glas-harness ADR-002 and `src/rein_openweights/openrouter_client.py`.
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2026-07-26 12:29:06 +02:00
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- **Not a second harness framework.** Session semantics, tool policy
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schema, sandbox consumption, and audit reporting are glas-harness's
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contract (`GLAS-WP-0001-T01`) — this repo implements it, not forks it.
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- **Not a sandbox provisioner.** Isolation comes from sand-boxer via
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glas-harness, the same as every other rein.
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- **Not tenant-specific logic.** Anything specific to one consumer
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belongs in that consumer's configuration, not hardcoded here.
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## Status
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2026-07-26 13:37:09 +02:00
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Minimal agentic loop implemented and unit-tested (26 tests, all mocked
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at the network/subprocess boundary): tool surface, OpenRouter client,
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credential acquisition, commit-verified success criterion, State Hub
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2026-07-26 13:46:24 +02:00
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reporting. See `workplans/REIN-OW-WP-0001-bootstrap.md`.
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**Live-proven (2026-07-26):** run for real through glas-harness's
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gateway (`glas_harness.reins.rein_openweights.ReinOpenWeights`) inside a
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real `ext.bwrap` sandbox, against the real OpenRouter API
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(`qwen/qwen-2.5-72b-instruct`) — a 2-turn tool-calling loop produced a
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real, verified git commit. Credential reused the `OPENROUTER_API_KEY`
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already present in the environment (the same one llm-connect resolves),
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via this repo's own `credentials.py` env-var short-circuit — no OpenBao
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round trip needed for this run.
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The glas-harness adapter (`glas_harness/reins/rein_openweights.py`,
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mirroring `reins/rein_aharness.py`) now exists and is what performed
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this run.
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