The body is lean — it assumes Claude already knows what Gibson/Golden Gate are and uses tight tables and bullets with no padding about basic molecular biology. It is not a 2 because every section earns its tokens rather than including unnecessary explanation.

Provides copy-paste-ready executable `tu run` commands with full JSON arguments and named output fields, plus a real referenced QC script with documented usage. It is not a 2 because the guidance is fully executable rather than pseudocode or abstract direction.

Clear sequenced workflow (Step 0 method choice through Step 4 gotchas) with an explicit validation checkpoint at Step 3 ('QC before ordering', PASS/WARN) before the costly ordering step. It is not a 2 because an explicit feedback loop is present for this batch/risky operation.

Well-organized sections with a one-level-deep reference to a real bundle script (scripts/cloning_qc.py for QC details) and Related-skills links; for a sub-50-line body this satisfies the simple-skill allowance. It is not a 2 because navigation is clearly signaled and content is appropriately split rather than inlined.

Lists multiple concrete capabilities — 'Gibson Assembly (overlap design for seamless multi-fragment joining)' and 'Golden Gate Assembly (Type IIS / BsaI / BbsI design with unique 4-bp fusion overhangs)' plus domestication, overhang-uniqueness, and overlap-Tm rules. It is not a 2 because it enumerates comprehensive specific actions rather than naming only the domain.

Explicitly states both what ('Gibson/Golden Gate design', 'domestication', 'overhang-uniqueness', 'overlap-Tm') and when ('Use when you need to plan how to join DNA fragments... design assembly overlaps/overhangs, or decide between cloning methods'). It is not a 2 because the 'when' is an explicit trigger clause, not merely implied.

Includes natural terms a cloning user would say — 'Gibson Assembly', 'Golden Gate Assembly', 'plan how to join DNA fragments into a construct', 'design assembly overlaps/overhangs', 'cloning methods'. It is not a 2 because coverage spans the common variations rather than a single keyword.

Occupies a clear molecular-cloning niche and explicitly distinguishes itself from the primer-design skill ('For PCR primers... see tooluniverse-primer-design'), so it is unlikely to trigger for the wrong skill. It is not a 2 because the triggers are specific and non-overlapping with sibling skills.