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+---
+name: fesa-reference-models
+description: Use when designing FESA reference model portfolios, Abaqus input artifact bundles, metadata provenance, required reference CSV artifacts, coverage matrices, and implementation-planning handoffs.
+---
+
+# FESA Reference Models
+
+Use this skill to define test model portfolios and reference artifact contracts before implementation planning.
+
+## Inputs
+
+Read these first:
+
+- `AGENTS.md`
+- `docs/SOLVER_AGENT_DESIGN.md`
+- `docs/reference-models/README.md`
+- `docs/requirements/<feature-id>.md`
+- `docs/research/<feature-id>-research.md`
+- `docs/formulations/<feature-id>-formulation.md`
+- `docs/numerical-reviews/<feature-id>-review.md`
+- `docs/io-definitions/<feature-id>-io.md`
+
+## Workflow
+
+1. Define reference strategy: code verification, solution verification, and benchmark/reference comparison.
+2. Build a model inventory: smoke, analytical, patch test, benchmark, regression, and negative/invalid-input models.
+3. For each model, record `model_id`, purpose, verified requirements, analysis type, element type, material, boundary conditions, loads, expected quantities, tolerance, source, and status.
+4. Define `references/<feature-id>/<model-id>/` artifact bundle requirements.
+5. Require `model.inp`, `metadata.json`, `displacements.csv`, `reactions.csv`, `element_forces.csv`, `stresses.csv`, and `README.md` unless explicitly not applicable.
+6. Define optional `strains.csv` and `energy_or_residual.csv` only when upstream acceptance criteria require them.
+7. Define metadata provenance, units, coordinate system, output requests, artifact status, and limitations.
+8. Build a Coverage Matrix mapping requirement id, model id, compared quantity, artifact file, tolerance, verification method, and status.
+
+## Output Contract
+
+Produce or revise `docs/reference-models/<feature-id>-reference-models.md` with:
+
+- Metadata
+- Reference Strategy
+- Model Inventory
+- Model Record
+- Abaqus Input Requirements
+- Artifact Bundle Contract
+- Metadata JSON Contract
+- Reference CSV Requirements
+- Coverage Matrix
+- Artifact Acceptance Checklist
+- Open Issues and Downstream Handoff
+
+## Boundaries
+
+- Do not implement code.
+- Do not implement parsers.
+- Do not design C++ APIs or file ownership.
+- Do not run Abaqus, Nastran, or any reference solver.
+- Do not generate reference CSVs.
+- Do not compare solver results.
+- Do not approve release readiness.
+
+## Quality Gate
+
+- Every `must` requirement maps to at least one model and compared quantity.
+- `model.inp` stays within the supported Abaqus keyword subset or records an open issue.
+- `metadata.json` includes provenance, Abaqus version/source, units, coordinate system, tolerance, and CSV schema version.
+- Missing required CSVs keep the model at `needs-reference-artifacts`.
+
+## Handoff
+
+Send model order and tests that should fail first to Implementation Planning Agent. Send schema, matching, output location, and tolerance mapping to Reference Verification Agent. Send physical expectations to Physics Evaluation Agent.