The description names the domain (legacy system migrations, codebase modernization) and lists several scenarios, but it focuses more on 'when to use' triggers than on concrete actions the skill performs. It never explicitly states what the skill *does* — e.g., 'generates migration plans', 'produces refactoring roadmaps' — only when to invoke it.

The 'when' is thoroughly addressed with explicit trigger scenarios and even negative boundaries (Do NOT use for...). However, the 'what does this do' is largely missing — the description never clearly states the concrete actions or outputs the skill produces, only the contexts in which to invoke it.

Excellent coverage of natural trigger terms: 'legacy system migrations', 'codebase modernization', 'monolith decomposition', 'microservices consolidation', 'cross-language rewrites', 'framework upgrades', 'strangler fig pattern', 'incremental migration strategy', 'refactoring roadmaps'. These are terms users would naturally use when requesting this kind of help.

The description explicitly delineates boundaries by naming three related skills and specifying what NOT to use this skill for (domain analysis, component sizing, decomposition planning). This makes it highly distinctive and minimizes conflict risk with adjacent skills.

The skill is mostly efficient but has some redundancy — the core principles repeat constraints that appear again in the MUST DO/MUST NOT DO section (e.g., 'never assume' and 'guess the meaning of acronyms' appear in both). The ASCII workflow diagram is helpful but the surrounding prose could be tighter. Overall reasonably lean for a complex multi-phase skill.

The skill provides a clear workflow structure and specific output file paths, but the actual detailed instructions are deferred to reference files (references/research-phase.md, references/plan-phase.md, etc.) that we cannot evaluate. The steps described are more procedural descriptions than fully executable guidance — there are no concrete examples of what a domain migration file should look like, no template snippets, and no example file:line citation format.

The two-phase workflow (RESEARCH → PLAN) is clearly sequenced with explicit ordering constraints ('Never skip RESEARCH. Never start PLAN without completing RESEARCH.'). Each phase has numbered steps with clear outputs. The constraint that every migration step must include a rollback strategy serves as a validation checkpoint. The reference loading table provides clear conditional triggers for when to load each reference.

Excellent progressive disclosure structure. The SKILL.md serves as a clear overview with a well-organized reference table that maps six reference files to specific loading conditions. References are one level deep and clearly signaled with 'Load when' conditions. The output structure is cleanly separated into research/ and domains/ directories.