Step 4: interface

Read First

/AGENTS.md
/docs/ABAQUS_SUBROUTINE_AGENT_DESIGN.md
/docs/ARCHITECTURE.md
/docs/ADR.md
/.codex/skills/abaqus-subroutine-interface/SKILL.md
/docs/requirements/uel-3d-euler-beam.md
/docs/formulations/uel-3d-euler-beam.md
/docs/numerical-reviews/uel-3d-euler-beam.md
/docs/io-definitions/README.md

Task

Create /docs/io-definitions/uel-3d-euler-beam.md.

Define the Abaqus UEL ABI and data contract for this feature. Include:

Exact UEL subroutine signature and include convention for Abaqus/Standard.
Supported NDOFEL, NNODE, MCRD, NPROPS, NJPROP, and MLVARX assumptions.
DOF ordering and mapping between Abaqus arrays and kernel arrays.
PROPS and optional JPROPS schema, including units and validation rules.
COORDS and orientation definition contract.
U, DU, V, A, TIME, DTIME, PARAMS, LFLAGS, KSTEP, KINC responsibilities for supported static use.
RHS, AMATRX, SVARS, ENERGY, and PNEWDT update responsibilities.
CSV extraction schema for external solver-result validation, including required columns, units, coordinate systems, and tolerances.
model.inp keyword subset expected by the reference model plan.
Thin-wrapper boundary between Abaqus ABI code and no-Abaqus kernel code.

Do not create or modify Fortran source, tests, reference artifacts, or implementation plans in this step.

Tests To Write First

None. This is an interface artifact step.

Acceptance Criteria

python -m unittest discover -s scripts -p "test_*.py"
python scripts/validate_reference_artifacts.py
python scripts/validate_workspace.py

The step is complete only when /docs/io-definitions/uel-3d-euler-beam.md gives enough ABI and CSV detail for no-Abaqus tests and external artifact validation.

Validation Notes

Do not require this repository to parse ODB files.
Update /phases/uel-3d-euler-beam/index.json step 4 with completed, error, or blocked and a concrete summary or reason.

Forbidden

Do not add JavaScript/TypeScript/npm fallback.
Do not run Abaqus analyses from this project.
Do not generate reference CSVs.
Do not create Fortran production source.
Do not break existing tests.

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