model-sovereignty

name	model-sovereignty
description	This skill should be used when the user asks about "local models", "custom models", "fine-tuning", "self-hosting models", "model selection", "which model should I use", "data privacy and models", "LoRA", "RAG vs fine-tuning", "Ollama", "vLLM", or wants guidance on whether to build, host, or customise their own AI models.

Model Sovereignty

Model sovereignty is the practice of making deliberate decisions about which models to use, where they run, and whether to create custom models. It extends the framework's Theme #2 (Agency and Sovereignty) into the model layer.

This skill guides practitioners through the decision framework from cross-cutting Theme #17 and Appendix P of the framework.

The Decision Hierarchy

Exhaust simpler approaches before escalating complexity. Each step adds maintenance burden.

1. Prompting + context engineering — the default. Most teams underestimate how far this carries them. Exhaust it first.
2. RAG — when the limitation is knowledge (volatile, large, or frequently changing information).
3. Fine-tuning (LoRA/QLoRA) — when the limitation is behaviour (consistent domain-specific patterns at scale).
4. Distillation — when the limitation is size or speed (edge deployment, latency-sensitive applications).
5. Local hosting — when the limitation is privacy, cost at scale, or independence from vendor defaults.

The Decision Framework

Walk through these questions in order. Stop at the first "yes."

Does your data require local processing? PII, regulated data, trade secrets, or data subject to residency requirements → local hosting is non-negotiable for those interactions. Consult references/decision-framework.md.

Does knowledge change frequently? Information changing weekly/monthly → add a RAG layer regardless of hosting choice. RAG updates instantly; fine-tuning requires retraining.

Does the model need consistent domain behaviour at scale? Reliable format compliance, style consistency, or decision logic across thousands of requests → fine-tune with LoRA/QLoRA. Consult references/technique-comparison.md.

Is baseline load above the break-even threshold? ~30M tokens/day sustained → self-hosted inference is economically justified within 4 months. Consult references/hosting-options.md.

None of the above? Use cloud API models with good prompting and context engineering.

The Sovereignty Test

Ask: "If my API provider changed pricing, rate-limited me, or discontinued my model tomorrow, what would happen?"

A sovereign engineer has an answer:

• A fallback model identified and tested
• Specifications precise enough to regenerate with any capable model
• Local alternatives evaluated for critical workflows
• Data classification that determines what can route where

Getting Started

For data sovereignty: Start with data classification. List every type of data that flows through your AI interactions. Classify each as Public, Internal, Sensitive, or Restricted. Update MODEL_ROUTING.md with routing rules based on classification.

For cost sovereignty: Calculate your monthly token usage. Compare API costs against self-hosted alternatives at your volume. The break-even is typically 30M tokens/day sustained.

For domain sovereignty: Identify your three most common AI failure modes. If failures come from missing knowledge → evaluate RAG. If failures come from inconsistent behaviour → evaluate fine-tuning. If failures come from reasoning capability → stay on frontier APIs with better prompting.

For operational sovereignty: Identify your vendor dependency. Could you switch providers in a week? A month? Never? The answer determines your urgency.

Maintenance Awareness

Custom models accumulate maintenance debt. Budget for:

• Model versioning (pin versions, test before updating)
• Retraining cadence (quarterly for fine-tuned models)
• Drift detection (monitor output quality metrics)
• Exit strategy (every custom model should have a fallback)

For detailed technique comparisons, hosting option evaluation, and current-era model recommendations, consult the reference files.