---
name: fesa-requirements-baseline
description: Use when defining FESA solver feature requirements, acceptance criteria, tolerance decisions, verification quantities, and a requirement verification matrix before research, formulation, reference modeling, or implementation planning.
---

# FESA Requirements Baseline

Use this skill to turn a solver feature request into a verifiable baseline that downstream agents can use without guessing.

## Inputs

Read these first:

- `AGENTS.md`
- `docs/SOLVER_AGENT_DESIGN.md`
- `docs/requirements/README.md`
- User feature request, target capability, constraints, and known exclusions
- Existing `docs/requirements/<feature-id>.md` when revising a feature

## Workflow

1. Assign a stable `feature_id` in kebab case.
2. Define purpose, included scope, excluded scope, and analysis definition.
3. Convert requested behavior into `shall` statements with ids like `FESA-REQ-<FEATURE>-###`.
4. Define verification quantities: displacement, reaction, element force, stress, strain, energy, or residual.
5. Record Tolerance Policy values or mark them `needs-user-decision`.
6. Record Reference Artifact Requirements under `references/<feature-id>/`.
7. Build a Requirement Verification Matrix that maps requirement, source, verification method, acceptance criteria, tolerance, downstream agents, and status.
8. Keep unresolved decisions visible as open issues; do not hide gaps behind vague wording.

## Output Contract

Produce or revise `docs/requirements/<feature-id>.md` with:

- Metadata with `feature_id`, status, owner agent, and date
- Purpose, In Scope, Out Of Scope, and Analysis Definition
- Input and Output Requirements
- Verification Quantities
- Tolerance Policy
- Reference Artifact Requirements
- Requirement Verification Matrix
- Open Questions and Downstream Handoff

## Boundaries

- Do not implement C++ code.
- Do not write finite element formulations.
- Do not design C++ APIs or file ownership.
- Do not run Abaqus, Nastran, or any reference solver.
- Do not generate reference HDF5 files or deterministic CSV views.
- Do not approve release readiness.

## Quality Gate

- Every `must` requirement has a verification method and acceptance criteria.
- Every numerical requirement has units, coordinate system, and tolerance or an explicit owner for the decision.
- Every reference-comparison requirement names required artifacts.
- Words like "accurate", "fast", and "Abaqus-like" are converted into measurable criteria or open questions.

## Handoff

Route theory gaps to Research Agent, math gaps to Formulation Agent, schema gaps to I/O Definition Agent, reference artifact needs to Reference Model Agent, and implementation readiness to Implementation Planning Agent.