Conciseness

The body is dense with non-obvious, QuTiP-5-specific constraints (ptrace semantics, sqrt(gamma) generator convention, QFunc API, seeds, keyword-only options) and avoids explaining concepts Claude already knows. Minor sections could be trimmed — the family-package commentary (qutip-qip/qtrl/jax/cupy), the long citation instructions — and some version/date detail sits outside a dedicated deprecated/old-patterns section, matching the 4 anchor 'efficient; minor instances of over-explanation that could be trimmed' rather than the fully lean 5 anchor.

Actionability

Nearly all snippets are executable with concrete parameters, asserts, and copy-paste-ready uv and CLI commands (mesolve, mcsolve, QobjEvo, Qobj/dims examples). The steady-state snippet uses undefined placeholders (H, c_ops) the skill itself flags as illustrative, which keeps it just short of the 5 anchor's 'fully executable, covers common cases'.

Workflow Clarity

The workflow is clearly sequenced with explicit validation: a numbered 7-step model contract, a solver-selection table with required justification, in-code asserts (norm, residual < 1e-9, population decay), feedback loops ('do not change an integrator without rerunning tolerance and invariant checks', convergence sweeps over every artificial cutoff), and a completion checklist. This matches the 5 anchor (explicit validation steps, feedback loops, checklists) and exceeds the 4 anchor, which allows missing checkpoints.

Progressive Disclosure

The body is an overview that defers detail to five real, one-level-deep reference files, each listed with a purpose in the References section, plus a scripts table with purposes; all referenced paths exist. The only cross-pointer found is a lateral sibling reference (time_evolution.md → advanced.md), not deep nesting, so it matches the 5 anchor (well-signaled one-level references, easy navigation).

Specificity

The description names concrete actions ('Simulate and audit closed and open quantum-system models with QuTiP 5') and enumerates five specific workflow families ('deterministic, trajectory, steady-state, spectral, and phase-space'), which comprehensively matches the skill's actual coverage. It clearly fits the anchor 'lists multiple specific concrete actions; comprehensive coverage' rather than the 4 anchor, which requires minor coverage gaps.

Completeness

Both parts are present: a concrete 'what' (simulate and audit closed/open quantum-system models with the workflow list) and an explicit 'when' clause ('Use for local quantum-dynamics work...'). The 'when' is phrased as a rigor condition ('where physical assumptions, dimensions, and numerical convergence must be explicit') rather than concrete trigger situations users would naturally express, matching the 4 anchor ('when' could be more explicit or specific) instead of the 5 anchor's natural trigger phrases.

Trigger Term Quality

Good natural-term coverage: 'QuTiP 5', 'quantum-system models', 'quantum-dynamics', 'trajectory', 'steady-state', 'spectral', 'phase-space' are phrases users of this domain would say. It misses common variations like 'master equation', 'Lindblad', 'density matrix', 'Hamiltonian', or 'qubit', so it falls just short of the comprehensive-synonyms anchor at 5.

Distinctiveness Conflict Risk

It names a specific niche package ('QuTiP 5') with domain-distinct triggers (quantum dynamics, phase space, steady-state spectra), giving it a clear niche with minimal conflict risk against generic simulation or other scientific skills. It does not match the 4 anchor's 'minor overlap risk with closely related skills' since the named tool and workflow families are unambiguous.