Qiskit

This gives Claude full access to Qiskit, IBM's quantum computing framework with 13M+ downloads. You get circuit building with gates and measurements, transpilation that's 83x faster than competitors, and execution on both local simulators and real quantum hardware like IBM's 100+ qubit systems. The skill covers the complete workflow from constructing circuits to optimizing them for hardware constraints to running variational algorithms like VQE and QAOA. Use it when you're prototyping quantum algorithms, need to interface with IBM Quantum or other providers, or want to experiment with quantum chemistry and optimization problems. The reference docs are well organized around primitives, transpilation stages, and the four step Qiskit Patterns workflow.