Conciseness

Every section carries non-obvious, skill-specific content: the glossary redefines familiar words with precise project meanings ("Interface — everything a caller must know... Not just the type signature"; "Seam — ... Use this, not 'boundary'"), and full definitions are deferred to LANGUAGE.md rather than inlined. There is no filler explaining concepts Claude already knows, so it sits at the lean/efficient anchor rather than the minor-trim anchor of 4.

Actionability

For an instruction-only skill the guidance is fully executable: a concrete tool invocation ("use the Agent tool with `subagent_type=Explore`"), five specific friction questions, the deletion-test procedure, a fixed candidate format (Files/Problem/Solution/Benefits), a literal question to ask the user, and copy-paste-ready framing text for the ADR offer. It matches the anchor for specific, ready-to-use guidance covering the common cases.

Workflow Clarity

The three-stage sequence is clearly ordered with an explicit user gate ("Do NOT propose interfaces yet. Ask the user: 'Which of these would you like to explore?'") and a decision rule for ADR conflicts. It falls short of 5 because the Explore stage has no stopping or convergence criteria (when to stop exploring, how many candidates to surface) and there is no loop-back path when the user rejects every candidate rather than one — minor validation gaps consistent with anchor 4, but well above the missing-checkpoint level of 3.

Progressive Disclosure

The body is a clear overview with well-signaled, one-level-deep references: the working glossary is inlined while "Full definitions in [LANGUAGE.md]" and the full principles list are deferred, and [INTERFACE-DESIGN.md] is signaled exactly at the point of need. No reference nesting exists and the content split (summary inline, detail external) matches the top anchor; the cross-skill ../grill-with-docs/ links are a portability fragility but remain single-level and clearly signaled.

Specificity

The description lists several concrete actions ("find refactoring opportunities, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable") with only minor coverage gaps. It falls short of a 5 because the headline capability "Find deepening opportunities" is skill-internal jargon that a user browsing skills cannot decode without opening the body, and well above a 3 because action coverage goes beyond 1-2 generic actions.

Completeness

It explicitly answers both what ("Find deepening opportunities in a codebase, informed by the domain language in CONTEXT.md and the decisions in docs/adr/") and when ("Use when the user wants to improve architecture, find refactoring opportunities, consolidate tightly-coupled modules, or make a codebase more testable and AI-navigable") with concrete trigger phrases, matching the anchor-5 exemplar structure exactly. The when-clause could not reasonably be more explicit.

Trigger Term Quality

Good natural keyword coverage: "improve architecture," "refactoring opportunities," "tightly-coupled modules," "testable" are phrases users would actually say. Not a 5 because common synonyms like "restructure," "clean up the codebase," or "reduce coupling" are missing; not a 3 because the present terms are well chosen rather than partial or generic.

Distinctiveness Conflict Risk

The skill occupies a clear niche (architecture deepening informed by CONTEXT.md domain language and ADRs), but the triggers "improve architecture" and "refactoring opportunities" have minor overlap risk with generic refactoring or code-cleanup skills. Not a 5 because those shared triggers could route a plain "help me refactor" request to the wrong skill; well above a 3 because the CONTEXT.md/ADR framing is distinctly its own.