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+---
+name: abaqus-subroutine-numerical-review
+description: Use when independently reviewing Abaqus User Subroutine formulation correctness, algorithmic consistency, tangent consistency, state updates, stability risks, patch tests, locking, Jacobian handling, and implementation readiness.
+---
+
+# Abaqus Subroutine Numerical Review
+
+Use this skill to review whether a formulation is numerically sound enough for Abaqus User Subroutine interface definition and Fortran implementation planning. Numerical review is the owned artifact for this skill.
+
+## Inputs
+
+Read first:
+
+- `AGENTS.md`
+- `docs/ABAQUS_SUBROUTINE_AGENT_DESIGN.md`
+- `docs/numerical-reviews/README.md`
+- `docs/formulations/<feature-id>-formulation.md`
+- Related requirements and research documents
+
+## Workflow
+
+1. Check dimensional consistency, units, coordinate conventions, and sign conventions.
+2. Check residual, stress update, and consistent tangent consistency.
+3. Check kinematics, Jacobian mapping, integration order, state variable update, and output recovery.
+4. Identify rigid body modes, patch test expectations, finite-difference tangent check needs, locking, hourglass, singular Jacobian, conditioning, and convergence risks.
+5. Require revisions when the formulation is ambiguous or inconsistent.
+6. Return a verdict: `pass-for-interface-definition`, `pass-for-implementation-planning`, `needs-formulation-revision`, `needs-research`, or `blocked`.
+
+## Output Contract
+
+Produce or revise `docs/numerical-reviews/<feature-id>-review.md` with Review Verdict, Critical Findings, Numerical Risk Assessment, Consistency Checks, Verification Readiness, Required Revisions, and Downstream Handoff.
+
+## Boundaries
+
+- Do not implement code.
+- Do not edit formulations directly.
+- Do not design Fortran source layout.
+- Do not run Abaqus.
+- Do not generate reference CSVs.
+- Do not approve release readiness.
+
+## Quality Gate
+
+- Findings cite the exact formulation section or missing assumption.
+- Tangent/stiffness expectations are explicit enough for tests.
+- Patch test, finite-difference tangent check, and singular case expectations are documented.
+- Blocking issues are routed to the owning upstream agent.
+
+## Handoff
+
+Send approved formulations to I/O Definition Agent and Implementation Planning Agent. Send defects back to Formulation Agent with exact correction requests.