Conciseness

The ~40-line body is dense and lean: every sentence carries skill-specific knowledge (tool name, MCP endpoint, dataset IDs, parameter ranges, response semantics, REST routes, auth header). No padding, no explanation of concepts Claude already knows; the example API key is explicitly flagged as shape-only. Every token earns its place.

Actionability

Fully executable guidance: tool call `get_macro_history` on a named server URL, dataset table with country requirements, parameter values (history true/false, limit 1..365), response schema, copy-paste-ready example requests ("{\"dataset\":\"world-cpi\",\"country\":\"Germany\",\"limit\":12}"), and five complete REST URLs with the auth header name. Not 4: the common cases (MCP history request and REST GET) are both directly executable.

Workflow Clarity

A clear sequence is present with real checkpoints: "Read `unavailable` first", "request one country at a time and align observation dates and definitions before comparing", "truncated: true means the response is not full history", and "Respect billing denials, rate limits and `Retry-After`". Not 3: the checkpoints are explicit, not merely implied. Not 5: the workflow is embedded in prose rather than a numbered sequence, and there is no explicit validate→fix→retry loop for error recovery. This is read-only retrieval, so the destructive/batch cap does not apply.

Progressive Disclosure

Single-file skill under 50 lines with no bundle files and no need for external references; all content fits inline and is organized into clear sections (Connected plugin, REST and authentication, Errors, Content safety). Per the simple-skill guideline, well-organized sections alone merit 5 here.

Specificity

"Compare CPI, interest rates and sovereign yield histories from seeded official reports" plus "preserve country provenance, index base, frequency, yield measure and missing readings" lists multiple concrete actions with comprehensive coverage of the niche. Not 4: there are no meaningful coverage gaps within its defined domain — the compare action spans three dataset types and the preserve action enumerates all critical metadata attributes.

Completeness

Explicitly answers both: what — "Compare CPI, interest rates and sovereign yield histories from seeded official reports"; when — "Use for inflation or rate trends". The 'when' clause is explicit with concrete trigger phrases, matching the anchor-5 example structure; not 4, because the trigger guidance is specific rather than vague.

Trigger Term Quality

Natural user terms are present: "inflation", "rate trends", "CPI", "interest rates", "sovereign yield" — the phrases a user would naturally say. Not 5: common variations such as "yield curve", "Treasury yields", or "central bank/policy rates" are absent, so a few natural synonyms are missing.

Distinctiveness Conflict Risk

Clear niche (macroeconomic history comparison from seeded official reports) with distinct triggers (inflation/rate trends) that would not fire for unrelated skills. Not 4: the domain is narrowly scoped and the dataset vocabulary (CPI, sovereign yields, provenance, index base) is unique to this skill.