docs(prd): AI back-office — agent fleet for daily admin & accounting
New PRD tree vibe/PRD/ai-back-office/ (hub + 6 leaves + STATUS): task inventory T01-T16 with mode operatoire, atom/contract architecture on the ADR-0003 write gate, four-tier model fleet (Claude/Mistral/M4/Pi), 12 challenges with mitigations, POC plan with exit criteria, QA strategy with autonomy promotion gates. Index row + bidirectional backlinks (erp guidebook, safe-prod PRD). Co-Authored-By: Claude Fable 5 <[email protected]>
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[vibe](../../README.md) > [PRD](../README.md) > [AI back-office](README.md) > **Model fleet**
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# Model fleet — four tiers, one routing policy
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> **Status:** In design
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> **Last Updated:** 2026-07-11
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> **Up:** [AI back-office hub](README.md)
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> **Related:** [Agent architecture](agent-architecture.md) · [Task inventory](task-inventory.md) · [POC plan](poc-plan.md)
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## The four tiers
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| Tier | Where | Availability | Assigned work | Data policy | Marginal cost |
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| --- | --- | --- | --- | --- | --- |
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| **Pi SLM** | k3s cluster (pi1–3, arm64), llama.cpp/Ollama server, quantized 1–4B | **24/7** (survives cloud + laptop outages) | T01 triage, T11 reminders, event detection, queue enrichment | everything stays in the lab | ~0 € (electricity) |
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| **M4 local** | MacBook Pro M4, Ollama/MLX, 7–30B class | **when awake** — opportunistic, never time-critical | T02/T16 sensitive extraction, T09 cash report, second extractor, drafting | on-device; bank/contract content never leaves | 0 € |
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| **Mistral (EU cloud)** | La Plateforme API (Mistral Large/Medium class + OCR) | on-demand | second/independent extractor, OCR for scans, FR fiscal wording, volume overflow | EU residency; acceptable for business documents | cents/doc |
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| **Claude (frontier)** | Claude Code + skills (interactive), Agent SDK / API (headless) | on-demand | business validation vs fiscal profile, manifest assembly, orchestration, escalations, T12 research, **building the atoms themselves** | prefer minimized/structured payloads; full docs only when the human says so | subscription + API cents |
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Model *candidates* per tier (evaluate at POC time — the named models will age faster than this PRD): Pi → Qwen3 1.7B/4B, Gemma 3 1B/4B class GGUF Q4; M4 → Qwen3 14B/30B-A3B, Mistral Small 3.x, Gemma 3 27B class (RAM-dependent); Mistral → current Large/Medium + dedicated OCR; Claude → current Opus-class frontier model. [POC-5](poc-plan.md#poc-5--model-routing-bench) produces the actual accuracy/latency/cost table; the registry's `model_policy` fields hold the outcome, not this page.
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## Routing policy
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Route by **(sensitivity, complexity, stakes, availability)** — in that order:
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1. **Sensitivity floor**: bank statements, contracts, anything with credentials → local tiers (M4/Pi) or EU cloud at most; escalation to Claude sends *extracted fields*, not raw documents, unless the human explicitly widens it.
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2. **Complexity ceiling per tier**: Pi handles closed-set classification and template rendering only; M4/Mistral handle structured extraction and drafting; ambiguity, multi-document reasoning, and anything touching the fiscal profile go to Claude.
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3. **Stakes gate**: any output that feeds a `write-*` or `outbound` atom must come from a tier that passed that atom's eval at the required accuracy — regardless of what cheaper tier "could" do it.
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4. **Availability fallback**: each atom's `model_policy` lists an ordered fallback chain; the router degrades along it and *flags the degradation in the journal* (a result produced by a fallback tier is marked as such).
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**Escalation rules** (mechanical, not vibes): confidence below the atom's threshold → next tier up; dual-extraction disagreement on critical fields → Claude; Claude uncertain → human review queue. Every escalation is journaled with its reason — escalation *rates* are a fleet health metric.
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## Structured output enforcement
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The format guarantee never rests on the model:
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| Tier | Mechanism |
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| --- | --- |
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| Pi (llama.cpp) | GBNF grammar / JSON-schema constrained decoding — a 1–4B model *cannot* emit malformed JSON |
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| M4 (Ollama/MLX) | JSON-schema `format` constrained decoding |
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| Mistral | JSON mode / function-calling schemas |
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| Claude | tool-use schemas (forced tool choice) |
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…and regardless of tier, every payload passes the same deterministic validators downstream ([agent architecture](agent-architecture.md#atom-contract)). Constrained decoding guarantees *shape*; validators guarantee *truth conditions* (arithmetic, checksums, plausibility).
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## Degraded modes
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| Outage | Keeps working | Queues | Lost until recovery |
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| --- | --- | --- | --- |
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| **Cloud down** (Anthropic + Mistral) | Pi triage, reminders, digests; M4 extraction when awake | writes awaiting business validation | escalations, T12 research |
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| **Laptop asleep/away** | everything cloud + Pi | M4-assigned sensitive extraction (or reroute to Mistral if policy allows) | nothing time-critical (by design) |
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| **Cluster down** | cloud tiers driven manually from the M4 | sentinel triage, reminders | 24/7 watching — operator falls back to the manual runbooks |
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| **ERP down** | triage, extraction, drafting | all `write-*` and read-verify stages | recording; restore runbook applies |
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| **Source or channel down** (Zoho, a bank API, Telegram) | every other lane, all tiers | the affected lane parks; item age stays visible once the channel returns | that feed/channel — its manual fallback applies ([C9](challenges.md#c9--provider--api-dependency): IMAP for mail, CSV export for banks, direct check-in replacing the digest) |
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The quarterly game-day ([QA strategy](qa-strategy.md#ops-qa)) exercises one of these on purpose.
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## Cost envelope
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At current volumes (~30 relevant mails, ~5–10 supplier invoices, 1 client invoice, 4 recos, ≤1 fiscal event per month), cloud inference is **single-digit euros per month** — the 30 €/month budget in the [success criteria](README.md#success-criteria) is generous headroom, with an alert at 20 €. The honest framing: at Arcodange's scale, the local tiers are **not** a cost play — they buy **resilience** (24/7 sentinel through cloud outages), **privacy** (bank/contract content stays home), and **institutional learning** (operating SLMs is itself lab capital). The expensive resource is frontier-tier *authoring* of atoms (Claude Code sessions), covered by the existing subscription and amortized as each atom graduates to cheaper tiers.
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