Conciseness

The body is dense and expert-aimed — it assumes MPS knowledge with zero padding about what MPS or a generator is, and every directive carries non-obvious gotcha value (e.g. "applicableConcept must be a structure-model node ref ... never the c:<langUUID>/<conceptId> form"). However, step 1's nested parenthetical digressions on startingPoint resolution and the meta companion-loading policy section are more than trivially trimmable, keeping it below the lean anchor-5.

Actionability

Provides copy-paste-ready commands with exact parameter forms: "mps_mcp_get_project_structure(moduleKind=\"Language\")", "mps_mcp_create_module(type=\"generator\", parentLanguage=\"<lang>\")", the exact ref syntax "r:<modelUUID>(<lang>.structure)/<nodeId>", a worked output-path example, and named validation/reading tools with argument-level guidance. For an instruction-only skill, guidance is fully executable and covers the common cases.

Workflow Clarity

The 8-step common-path workflow has explicit validation checkpoints and feedback loops: step 7 validates with mps_mcp_check_root_node_problems (including the onlyNodesWithProblems=false re-run when siblings look missing), step 8 MAKEs then reads generated text with a staleness re-MAKE warning, and the Generator Tracer / $TRACE$ bisection gives error-recovery guidance.

Progressive Disclosure

The Reference Index is well designed — one level deep, per-entry 'read when' conditions, and a 'start here — most common case' entry point — but scored against the actual bundle, none of the 18+ referenced files (references/macro-catalog.md, references/common-failures.md, etc.) exist in the package, so every navigation pointer dead-ends; several pointers additionally route through companion-skill roots (references/runtime-solutions.md 'in the mps-aspect-accessories skill root', references/dot-expression-basics.md in mps-model-manipulation), adding a second hop. Absent references are more than anchor 4's 'minor organization gaps', though the in-body structure is far better organized than anchors 1-2.

Specificity

Enumerates multiple concrete actions covering the full workflow: "author a generator module, add or edit root/reduction/weaving/pattern mapping rules, attach template macros ($COPY_SRC, $LOOP, $IF, ...), wire mapping labels, build template switches, write pre/post mapping scripts, navigate genContext" plus specific debug symptoms ("rule didn't fire", "infinite reduction loops", "generated-Java compile failures"). Coverage spans setup, all rule kinds, the complete macro list, and failure modes, exceeding the 'minor gaps' of anchor 4.

Completeness

Explicitly answers both: the "Use when defining or modifying MPS generators ... or debug ..." clause states when, and the action list (author module, add rules, attach macros, wire labels, build switches, write scripts, navigate genContext) states what, with concrete trigger phrases — matching the anchor-5 example pattern.

Trigger Term Quality

Contains the natural phrases an MPS user would actually say when they need this skill: "MPS generators", "generator module", "mapping rules", "template macros", "mapping labels", "rule didn't fire", "empty output", "missing references", "infinite reduction loops". Both action terms and failure-symptom synonyms are comprehensively covered rather than just 'good coverage with a few missing'.

Distinctiveness Conflict Risk

"MPS generators" is a clear, highly specific niche with distinct triggers, but closely related sibling skills in the same MPS family (mps-aspect-textgen, mps-aspect-generation-plan, mps-baselanguage) share trigger space around generated output and macro query bodies, creating minor overlap risk consistent with anchor 4 rather than the minimal-conflict of anchor 5.